Abstract:【Objective】To provide a scientific basis for high-yield cultivation of spring maize, Zea mays L., in southern hilly red soil.【Method】Film mulching cultivation was coupled with organic fertilizer and increasing K fertilizer, using conventional fertilization and open cultivation as the control. Yield, physiological and biochemical characteristics of spring maize were researched in different cultivation models.【Result】Conventional fertilization+organic fertilizer+K fertilizer+film mulching cultivation(TOK) resulted in the highest yield, increasing 3.4% compared with conventional fertilization+bare land (CK). One hundred-seed weight of TOK increased 14.9%, 15.1% and 20.4% respectively, compared with conventional fertilization+organic fertilizer+film mulching cultivation(TO), conventional fertilization+K fertilizer+bare land(TK) and CK. Each drought index showed TOK>TO>TK>CK. The net photosynthetic rate(Pn) in each growth stage showed TOK>TO>TK>CK. There was a maxmum change range of Pn among all treatments in maturity,which was 43.62%.【Conclusion】TOK is one of the better cultivation models for spring maize in hilly red soil upland of southern China, which can achieve high yield by increasing Pn and drought resistance.

Abstract:【Objective】In order to study the fertilizer response in an eight-year-old Pinus caribaea var. caribaea plantation in Yangjiang to the application of different proportions of nitrogen(N), phosphorus(P) and potassium(K) fertilizers mixed with microelements. 【Method】There were 17 top application treatments of different proportions of N, P and K fertilizers mixed with microelements. The growth and foliar nutrient concentrations of P. caribaea var. caribaea were determined after 15 months.【Result】The covariance analysis showed that the optimum proportion of fertilizers was N (21.5 g·plant^-1) and P₂O₅ (30 g·plant^-1). The individual stem volume of plants fertilized with 50 g urea+250 g calcium magnesium phosphate fertilizer+25 g KCl for 15 months was increased by 23.6% on average compared to the blank control. The treatments with P (N₂P₁K₂, N₂P₂K₂) had significantly more growth compared to the P deficiency treatment (N₂P₀K₂). In addition, boron(B) application significantly increased the stem volume under the same N, P and K treatment.【Conclusion】P and B are both important for P. caribaea var. caribaea growth after canopy closure. The proportion of N and P plays an essential role in regulating the fertilizer response of P. caribaea var. caribaea.

Abstract:【Objective】 This study aimed to achieve recycling of soy sauce residue oil, reduce its environmental pollution, and expand the resources of slow-release fertilizer material. 【Method】Coated nitrogen fertilizer was prepared by epoxy modification of soy sauce residue oil. The structure of the coated film was analyzed by infrared spectroscopy, high-power microscope and scanning electron microscope. The fertilizer efficiency was examined in corn pot experiment.【Result】After epoxy modification of the soy sauce residue oil, its structure changed which promoted forming of film with dense net structure. In corn pot experiment, there were no significant differences in leaf number and chlorophyll content between the test group using coated nitrogen fertilizer (T1) and the control group with normal fertilization (CK2). The final leaf area, stem girth and plant height of T1 were significantly different from those of the control group with no fertilization (CK0) and the control group with only phosphorus and potassium but no nitrogen fertilization (CK1), and increased by 9.5%, 4.3% and 7.3% at 60 days respectively compared with CK2. The corn plant fresh weight of T1 was significantly different from those of the other three groups. While the corn plant dry weight of T1 was not significantly different from that of CK2, it significantly increased by 14.2% and 5.2% respectively compared to CK0 and CK1. 【Conclusion】Coated nitrogen fertilizer could promote maize growth, and is considered slow-releasing in soil.

Abstract:【Objective】To test the effect of Beauveria bassiana on SYSU-OfHe-C, a cell line from hemocytes of Ostrinia furnacalis. To provide a theory basis for application of B.bassiana in the prevention and treatment of O. furnacalis.【Method】MTT and CCK-8 were employed to test the virulence of B.bassiana on SYSU-OfHe-C. Optical microscope and scanning electron microscope were used to observe the growth of B.bassiana and its influence on the morphology of SYSU-OfHe-C cells. 【Result】The IC₅₀ values of B.bassiana against SYSU-OfHe-C cells at 24 hours after treatment were recorded as 2.8×10⁵ and 1.4×10⁵ mL^-1 respectively by MTT and CCK-8. Furthermore, under real-time monitoring with optical microscope, encapsulization and phagocytosis were not found and B.bassiana was highly competitive when the conidia of B. bassiana were inoculated in the culture of SYSU-OfHe-C cells at logarithmic stage reaching a final concentration of 3.5×10⁴ mL^-1 for B.bassiana. B.bassiana started to germinate at 10 hours after treatment, and meanwhile, SYSU-OfHe-C cells started to reduce in number and change in morphology. At 24 hours after treatment, B.bassiana grew the entire visual field. The nearly round SYSU-OfHe-C cells had elongated or turned into irregular shape. Aggregation, fragmentation, cavitation, protuberance and penetration of SYSU-OfHe-C cells caused by B.bassiana mycelia were observed.【Conclusion】B.bassiana can change cellular morphology of hemocytes of O. furnacalis, but cannot induce its immune responses.

Abstract:【Objective】 To determine the dominant natural enemies of Monolepta hieroglyphica and Brevipalpus obovatus in Baihaozao and Wuniuzao tea gardens.【Method】A total of 30 quadrats were randomly selected in Baihaozao and Wuniuzao tea gardens using parallel jumping method. The numbers of species of pests and their natural enemies, and individuals of each species were recorded. Grey correlation degree method and niche analysis method were applied to analyze the relationships between two pest species, M. hieroglyphica and B. obovatus, and eleven species of natural enemies in quantity, occurring time and space.【Result】The top six species of natural enemies of M. hieroglyphica in Baihaozao tea garden were Misumenops tricuspidatus, Tetragnatha squamata, Erigonidium graminicolum, Theridion octomaculatum, Clubiona japonicola and Oxyopes sertatus, and in Wuniuzao tea garden were T. squamata, Brachymeria obscurata, M. tricuspidatus, Neoscona theisi, Tetragnatha maxillosa and E. graminicolum. The overlapping natural enemies between two tea gardens accounted for 50% of the total. The top six natural enemies of B. obovatus in Baihaozao tea garden were T. octomaculatum, E. graminicolum, T. squamata, O. sertatus, B. obscurata and N. theisi, and in Wuniuzao tea garden were E. graminicolum, T. maxillosa, T. squamata, N. theisi, B. obscurata and O. sertatus. The overlapping natural enemies between two tea gardens accounted for 83.33% of the total. 【Conclusion】The cumulative ratio of overlapping natural enemies between two tea gardens increases as the number of species of natural enemies increases. The influences of tea tree varieties on dominant natural enemies are higher for M. hieroglyphica compared to B. obovatus.

Abstract:【Objective】To construct a comprehensive evaluation index system of Xanthoceras sorbifolia germplasm, and provide the basis for type evaluation and classified management. 【Method】Based on biological characteristics and type classification of X. sorbifolia, a comprehensive evaluation index system was established by analytic hierarchy process. 【Result】The comprehensive evaluation index system was composed of three layers including a target layer, a control layer and an index layer. The target layer included growth, seed and fruit, seed production, oil production and phenophase characteristics. The index layer was composed of 19 indices. The weighted values of each index and evaluation method were determined by analytic hierarchy process, Delphi and index comprehensive evaluation methods. X. sorbifolia types in Chifeng, Nei monggol were evaluated using the comprehensive evaluation index system. Among different flower types, the scores of simple white flower (3.96) and simple red flower (2.75) were the highest. Among different fruit types, the score of big spherical fruit was the highest (3.98), followed with cylindrical fruit (3.67), and triquetrous fruit (3.50), and these three fruit types were considered as superior types with high production and high oil contents. 【Conclusion】The established evaluation index system can enable the selection of X. sorbifolia types for the purpose of oil production.

Abstract:【Objective】Toona sinensis is a China endemic timber species of high quality and fast growth. This study was aimed at investigating differences in photosynthetic characteristics among different T. sinensis provenances, and providing a theoretical basis for selection of superior provenances.【Method】Five photosynthetic indices of one-year-old seedlings of T. sinensis provenances collected from 14 counties in 11 provinces were measured with Li-6400 and analyzed. 【Result】There were highly significant differences among different provenances in five photosynthetic indices including net photosynthetic rate (Pn), stomatal conductance (Gs), intercellular CO₂ concentration (Ci), transpiration rate (Tr) and water use efficiency (WUE). The variation coefficient of Gs was the highest (27.52%), and that of Ci was the lowest (4.24%). The repeatability of Pn was the highest (96.08%), and that of WUE was the lowest (78.52%). Pn was highly significantly positively correlated with Gs, Tr and seedling height (P<0.01), and significantly positively correlated with ground diameter (P<0.05). Gs was highly significantly positively correlated with Ci, Tr and seedling height (P<0.01). Ci was significantly positively correlated with Tr (P<0.05). Tr was highly significantly positively correlated with seedling height (P<0.01) and significantly positively correlated with ground diameter (P<0.05). Provenances collected from Xing’an and Napo of Guangxi Province, and Peng’an of Sichuan Province had relatively high Pn compared to those from other counties, and provenances from Xing’an of Guangxi Province and Lechang of Guangdong Province had relatively high WUE.【Conclusion】Two principal components were obtained from five tested indices using the principal component analysis. Fourteen T. sinensis provenances can be divided into three groups including the group with the lowest Tr, the group with relatively high Pn and WUE, and the group with relatively strong photosynthesis and low WUE.

Abstract:【Objective】 To study the characteristics of photosynthetic light response of Machilus pauhoi, investigate the differences in photosynthesis among different M. pauhoi provenances, and provide the theoretical basis for selective breeding and afforestation of M. pauhoi.【Method】 Seeds of six M. pauhoi provenances with widespread potential in Guangdong were collected from Jianou of Fujian Province (MJO), Shunchang of Fujian Province (MSC), Lechang of Guangdong Province (YLC), Renhua of Guangdong Province (YRH), Lingchuan of Guangxi Province (GLC) and Gongcheng of Guangxi Province (GGC). The photosynthetic light response curves of the seedlings were recorded, and light response parameters including maximum net photosynthesis rate (Pn_max), light compensation point(LCP), light saturation point(LSP), apparent quantum yield (AQY), and dark respiration rate (R_d) were calculated.【Result】 GGC provenance had the highest Pn_max (12.20 μmol·m^-2·s^-1), and the largest difference between LSP and LCP (604.60 μmol·m^-2·s^-1). MJO provenance had the lowest Pn_max (5.32 μmol·m^-2·s^-1). MSC provenance had the smallest difference between LSP and LCP.【Conclusion】Among six provenances, GGC has the best capability of using low light and strong light and have the highest adaptability to light, therefore this provenance has relatively high photosynthetic potential and growth potential. Close planting or mixed planting may be feasible in the afforestation of M. pauhoi.

Abstract:【Objective】 To explore the effects of planting density on the growth of Anthocephalus chinensis plantation, namely, on tree height, canopy width, height under branch, diameter at breast height (DBH), individual tree volume and stand volume. 【Method】Planting densities of 625，667,833,1 667 and 2 500 trees·hm^-2 were established in a complete randomized block design. Based on the method of tally, the major growth indicators of nine experimental trees in each block were measured. Differences among different planting densities were analyzed using one-way ANOVA and Duncan’s Multiple Range Test. Relationship among different traits and planting density were explored using correlation analysis. 【Result】Planting density had significant effects on tree height, canopy width, height under branch, and stand volume (P<0.01). Tree height(y) and planting density(x) were significantly positively correlated, and the regression equation was y=-4.000 0×10^-7x² + 0.001 6x + 8.270 3. Stand volume(y) and planting density(x) were significantly positively correlated, and the regression equation was y=-1.000 0×10^-5x² + 0.112 7x -12.664 0. Canopy width(y) and planting density(x) were significantly negatively correlated, and the regression equation was y=15.942 5^{-4.000 0×10-5x}. Canopy width(y) and DBH(x) were significantly positively correlated, and the regression equation was y=9.661 3x² -103.950 0x + 293.870 0. 【Conclusion】For young A.chinensis plantation, the planting density of 2 500 trees·hm^-2 leads to the optimum results with the highest stand volume and tree height.

Abstract:【Objective】In order to investigate the geographical variation in seed traits among different provenances of Zenia insignis.【Method】The seeds from 21 counties of five provinces were collected, six phenotypic traits of the seed were recorded,and the geographic variation in seed traits was analyzed by ANOVA, correlation and partial correlation analysis, and cluster analysis.【Result】There were highly significant differences in six seed traits including seed length, width, thickness, length/width ratio, width/thickness ratio and 100-seed mass among different provenances. The coefficients of variation of seed traits ranged from 5.76% to 10.16%, among them the highest was seed thickness(10.16%)while the lowest was seed width (5.76%). The repeatabilities of all six traits were above 80%.The repeatability of seed length was the highest(98.1%), followed by seed thickness and seed width (>90%), and the repeatability of seed length/width ratio was the lowest (84.2%). All six seed traits showed negative correlations with latitude, longitude and altitude of seed origin.Seed thickness and 100-seed mass had significant negative correlations with latitude,and seed length/width ratio had significant negative correlation with altitude. All seed traits except seed thickness were highly negatively correlated with the average annual temperature,but positively correlated with the average annual precipitation. The correlations between the average annual sunshine hour and seed traits were not significant.Based on the six seed traits, the 21 provenances of Z.insignis were clustered into five groups. 【Conclusion】The 21 provenances of Z.insignis can be clustered into five groups with clear geographic and regional characteristics.

Abstract:【Objective】To study the geographic variations and trends in growth traits of different Melia azedarach provenances, select appropriate M. azedarach provenances for afforestation in Guangdong Province, and provide the basis for seed allocation.【Method】 The provenance test on M. azedarach from 53 provenances was conducted in Zengcheng, Guangzhou. Growth traits including tree height, ground diameter, branch number, trunk shape and crown were measured. The geographic variations, their trends, and their climatic and ecological basis were explored. 【Results】There were significant differences among provenances for the tested six traits: Height and diameter showed the highest variations with the ranges of 5-280 cm and 1.2-64.0 cm respectively. Except that trunk shape showed a significant level of variation (P <0.05), the other five traits all showed highly significant differences (P <0.01). The repeatability of height, east-west crown and south-north crown were above 40%, suggesting that their variations among provenances were relatively more stable compared to other traits. The repeatability of ground diameter was only 29.92%, indicating low stability of the variation. Regarding the geographic variations in growth traits of M. azedarach at seedling stage, the growth rate of the seedlings decreased as the provenances changed from south to north. The provenances which originated from high altitude grew faster compared to low altitude. The growth traits were influenced by multiple factors including longitude, latitude and altitude, among which latitude was the key factor. In addition, there were apparent climatic and ecological characteristics in the geographic variations of growth traits. The seedlings grew faster and had larger biomass for the provenances from areas of higher temperature, higher mean minimum temperature, more sunshine, more precipitation, and lower atmospheric pressure. Based on the growth traits of young forest, the 53 provenances were roughly clustered into six groups with clear geographic structure using NTsys with Euclidean distance of square sum of deviations.【Conclusion】Each provenance has obvious geographic variation trend. We can tentatively select provenances 740, 629, 843 and 349 which have rapid growth, large biomass, nice trunk shape and high adaptability for afforestation in Guangdong Province.

Abstract:【Objective】The adaptability and resources utilization of main herbaceous populations in habitat of Pinella yaoluopingensis were studied, with an aim to provide guidance and suggestions for protecting and exploiting P. yaoluopingensis. 【Method】 The herb layer in habitat communities of P. yaoluopingensis, an endemic species in Anhui Province was investigated. The niche breadths and overlaps of main herbaceous populations in the communities were measured using Levins-niche breadth, Shaanon-Wiener-niche breadth and Levins-niche overlap indices. 【Result】Among all 17 main herbaceous populations in habitat communities of P. yaoluopingensis, the niche breadths of most populations were wide. Parathelypteris glanduligera, Melica scabrosa and Macleaya cordata had the widest niche breadth, meanwhile, they were also the dominant populations of the herb layer. Arthraxon hispidu, Oenothera stricta and Erigeron annuus had the narrowest niche breadth, followed by P. yaoluopingensis. The important values and niche breadth Bi, Bi′ of main populations were highly significantly correlated, and the correlation coefficients were 0.807(Sig.＝0.000) and 0.707（Sig.=0.002）respectively. Of all population pairs, the population pairs whose niche overlap values were below 0.4 accounted for 83.46%, the population pairs whose niche overlap values were 0 accounted for 38.60%, but the population pairs whose niche overlap values were above 1.0 only accounted for 1.10%. There was no direct relationship between niche breadths and niche overlaps of main herbaceous populations. 【Conclusion】There is little similarity in ecological characteristics for main herbaceous populations in habitat of P. yaoluopingensis. There is no obvious tendency in resource sharing — the main herbaceous populations grow in the communities harmoniously, but there is no advantage in niche breadth for P. yaoluopingensis which is in associated status.

Abstract:【Objective】To identify the difference of mitogen-activated protein kinase gene (MAPK) sequences among intraspecific common buckwheat, Fagopyrum esculentum, and study the sequence change during the chronical domestication process. 【Method】 The common buckwheat varieties, containing nine cultivars and three wild types with shattering habit, were selected for PCR amplification of the conservative fragments of MAPK gene. Sequences were analyzed and protein conformations were predicted. 【Result】 The full length of buckwheat MAPK cDNA was 2 835 bp, the length of the open readling frame (ORF) was 1 827 bp, and 609 amino acids containing the TDY tripeptide module were encoded. The buckwheat MARK belonged to the group D of plant MARK proteins. A total of 723 invariable sites and 70 polymorphic sites in MAPK sequence of common buckwheat were identified in 12 tested materials. We did not find difference among the ORF sequences of nine cultivars, neither among three wild types. There were eight differential nucleotides in the ORF of MAPK gene which encoded three amino acid polymorphisms between the cultivars and wild types. We found a change of α-helix conformation which was induced by transforming histidine (H) to tyrosine (Y) at the 13th site in the ORF of MARK. 【Conclusion】 The MAPK sequence is highly conserved and the 13th amino acid site has been highly consistently selected during the chronical process of domestication.

Abstract:【Objective】 The purpose of this study was to analyze dynamic development of landscape fragmentation for urban forest in fast-urbanization regions, and provide scientific basis for master urban plan, urban green space system plan, urban forest construction and sustainable development in fast-urbanization regions. 【Method】Based on the Landsat TM/ETM+ satellite images taken in 1990, 2000 and 2010, the dynamic trends of landscape fragmentation for urban forest in Huizhou, Guangdong were analyzed by landscape pattern indices analysis and transition matrixes along three gradients including the central area, suburban area, and outer suburban area.【Result】The patch density of the central area increased from 0.08 to 0.25 per hm² during 1990—2010. Meanwhile, the mean patch area decreased from 11.81 to 3.92 hm². Similar changes in patch density and patch area happened to the suburban area, but the change scale reduced from 2000 to 2010 suggesting that the fragmented patches gradually narrowed in the central and suburban area. The landscape fragmentation process was relatively slow in the outer suburban area. The patch density of the outer suburban area first increased from 0.18 to 0.30 per hm², and then decreased to 0.11 per hm², and the mean patch area decreased from 9.12 to 3.51 hm². In 1990—2000, rapid and out-of-order urbanization led to the increased number and decreased area of urban green patches. However, during 2000—2010 the area of urban green patches gradually increased, the patch integration enhanced, and the landscape fragmentation decreased through construction of urban parks, afforestation in barren hills, and ecological restoration. A typical defragmentation trend was observed. 【Conclusion】Ecological restoration and reconstruction in an organized process can effectively improve the landscape condition of urban forest and increase urban forest coverage.

Abstract:【Objective】To model the process of straight blade cutting longan branches based on material mechanics and elastic foundation beam theory, and to calculate the shearing force of branches from the straight blade cutting using the model. 【Method】Shixia longan branches were used as test materials. The mechanical parameters of the branches and the coefficient of friction between the branch and blade were measured using a universal material test machine and a custom friction tester. The peak shearing forces were measured by the universal material testing machine and also calculated by the developed model under conditions of different branch moisture contents (M), branch diameters (d) and blade bevel angles (θ). The blade used in the cutting tests had a bevel angle of 10°, 20° or 30°.【Result】When M =76%, d =20.4 mm and θ =20°, the calculated curve showed the same trend as the curve derived from the experimental results, and the error of the peak shearing force was around 2.3%. When d =15.3 mm, θ =20° and M >30% which was the fiber saturation point, the peak shearing force increased with the increment of M and calculated values were within the error ranges of the experimental data. When M =76%, d =24.6 mm and θ increased from 10° to 30°, the peak shearing force increased significantly and the calculated values were also within the error ranges of the experimental data.【Conclusion】The model can be used to estimate the shearing force and investigate the effects of different mechanical parameters on the peak shearing force. The results will provide theoretical reference for the design and optimization of pruning machines.

Abstract:【Objective】CE-Bézier surfaces with multiple shape parameters were blended to generate the tractor form surface, so as to solve the problem that complex surfaces could not be described by using one single surface in tractor form design.【Method】A group of CE-Bézier surfaces were constructed and blended. Based on this, different tractor shapes were designed by adjusting the surface boundary positions and the shape parameters.【Result】Multiple design solutions of tractor body shape were obtained quickly. 【Conclusion】This method is efficient, convenient, and can be widely used in modern design area.

Abstract:【Objective】To improve the accuracy and reliability of automatic feeding rice seedlings in the orderly throwing transplanter, and reduce the seedling loss in the seedling feeding link. 【Method】A rice seedling-row-in-position detecting scheme and its practical program method were proposed，while a belt-type automatic seedling feeding mechanism (BASFM) and related control system were developed. Through prototype test, three kinds of characteristic signals representing the plug-seedling-row-in-position status were received based on direct-on-line detection of seedling stalk, plastic tray and magnetic bulge of ferric tray respectively. The synthetical measure attribute of plug-seedling-row-in-position signal was summarized. An optimal scheme to monitor plug-seedling-row-in-position and associated control circuit was established. The BASFM with functions of detecting seedling-row, transporting and feeding seedling was designed. 【Result】When body of plastic tray was chosen as a detected target, the success-detect rate was the highest (99.78%), magnetic bulges aside ferric tray was higher (96.64%) and seedling stalk was the lowest. When plastic tray or magnetic bulge of ferric tray was chosen as a row detected target, tray type showed no significant effect on success-detect rate, but significant while seedling stalk was chosen as a row detected target. For three seedling-row-in-position detecting schemes, the variance of transport motor speed also showed no significant impact on the seedling-row-in-position detecting performance between 30-60 r·min^-1.【Conclusion】This design of BASFM and affiliated seedling-row-in-position automatic detecting and control system can meet the performance requirements for pot-seedling-row transporting and feeding in the rice seedling orderly throwing transplanter.

Abstract:【Objective】To reveal the formation patterns and mechanisms of selective laser melted 316L stainless steel porous filter parts. 【Method】Both cubical and cylindrical 316L stainless steel porous filter parts with 1 mm pore size were designed and formed by selective laser melting (SLM). Microstructures and properties of these filter parts were investigated using optical microscope, scanning electron microscope and X-ray diffraction. Micro hardness of the parts was measured using microhardness tester.【Result】The formed filter parts were obtained with 95% density and without defects such as pore, crack and segregation. The intra-structure was mainly composed of dendrite crystals which were vertical to the interface and grew along the epitaxy. The microstructure obtained had even layers which were metallurgically bonded. There was clear evidence of directional solidification for the formed parts.【Conclusion】 The formed parts are composed of austenite, and microhardness ranges from 258 to 294 HV0.3. SLM can be used in prototyping filter parts with relatively small pore size.

Abstract:【Objective】To design a prototype of wheeled intelligent mobile platform at the basis of a 3-DOF fruit picking robot hand. 【Method】According to the working environment of farmland, the steering structure and anti-collision beam structure of the platform were designed. The deformation of the platform frame under three working conditions were simulated using ANSYS, and simulation of the motor was carried out using Simulink module based on MPTA or ID=0. The motion control program and human computer interface were programmed with VC++. The prototype walking experiments were carried out in Jiangpu farm, Nanjing.【Result】The maximum deformation of the platform frame was 14.1 mm under the crankle working condition，and the value of stress was under the yield limit of material. The motor based on MPTA control achieved stability after 0.8 ms. The maximum climbing angle of the platform was 10°, and the tracking path lateral deviation was 0.22 m at a speed of 1.5 meter per second. 【Conclusion】This mobile platform has reasonable structure, with high strength, rigidity and motion accuracy, which meets the requirements of practical use.

Abstract:【Objective】To improve selective degradation ability of catalyst （TiO₂）under visible light. 【Method】Salicylic acid molecularly imprinted and N-doped TiO₂powders were synthesized by an improved molecularly imprinted sol-gel technique using urea as a nitrogen (N) source and salicylic acid as a template molecule. The samples were characterized by XRD, TEM, UV-Vis diffuse reflectance spectrophotometer and N₂ adsorption-desorption.【Result】All samples were anatase.The red-shift of absorption band was caused by doping nitrogen to TiO₂ The better-developed pore structure and pass were due to molecular imprinting technique, and the enlarged specific surface area was generated by N-doping and molecularly imprinting. Compared to benzoic acid and methyl orange, TiO₂ selective photodegradation rate of salicylic acid (96.0%) was higher under visible light using molecularly imprinting and N-doping.【Conclusion】The selectivity and visible-light photoactivity of TiO₂ can be effectively improved using salicylic acid molecularly imprinting and N-doping.