Abstract:对Ｓｐｒａｇｕｅ－Ｄａｕｔｅｙ（ＳＤ）系大白鼠口服恩诺沙星的急性及亚急性毒性研究，用简化机率单位法测得ＳＤ系大白鼠口服恩诺沙星的ＬＤ６０为７７０９ｍｇ／ｋｇ，９５％可信限为８２３３一７２１８ｍｇ／ｋｇ；ＬＤ９０为９７４５ｍｇ／ｋｇ．亚急性毒性试验以每天分别用２０，１００，２００ｍｇ／ｋｇ体重的剂量添加入饮水中，供三组大白鼠自由饮服，分别于３０，６０ｄ抽检动物，检查内容包括食饵效率、器官系数、器官含水量、血液检验、血清谷－丙转氨酶检验，尿液检验及病理剖检观察与组织切片等项，结果了解到恩诺沙星引起以上各项指标异常变化程度较轻，而且不会因剂量加大和使用时间延长而出现毒性加剧的变化，说明恩诺沙星的毒性较低，与急性毒性试验所得的结果相符。

Abstract:应用光敏生物素标记鸡传染性支气管炎病毒ｃＤＮＡ，制备核酸探针、经斑点杂交法和碱性磷酸酶显色后，探针同以ｃＤＮＡ为模板合成的ＰＣＲ产物及其重组子ｐＳＸＩＢＶＳ１均呈现强阳性的蓝色斑点，而与正常尿囊液、新城疫病毒和鸡败血霉形体无杂交。一个初诊为ＩＢ感染的田间病料与探针杂交阳性结果相符合。试验表明该ｃＤＮＡ探针是敏感和特异的检测方法。

Abstract:Successful veterinary application of 3%hydrogen peroxide solution instead of con-ventional co ntrast agents for echocardiographic acoustic contrast is reported in this paper for the first time.Comparative tests using different kinds of contrast agents con-firmed that the 3 % H2O2 solution used for echocardiographic acoustic contrast in bovines was safe and reliable,simple and easy,with good reproducibility.The sonographic presentation of 3% H2O2 was markedly superior to that of sodium chlo-ride injection and 5 % glucose solution.

Abstract:在恒温条件下研究了温度对节瓜蓟马（ＴｈｒｉｐｓｐａｌｍｉＫａｒｎｙ）生长发育及产卵力的影响，得出节瓜蓟马卵期和若虫期的发育起点温度分别为７．４℃和８．４℃，有效积温则分别为８２．２日度及１６４．３日度。其发育速率与温度的关系呈逻辑斯蒂曲线关系。节瓜蓟马成虫产卵适温区是２０～３０℃，其中２５℃下成虫的平均产卵量及产卵率值均达最大，分别为５４．９０粒及２．１８粒／ｄ。文中给出了节瓜蓟马成虫产卵前期及平均寿命与温度间的数学关系表达式。

Abstract:描述了从香港打鼓岭的菠萝（Ａｎａｎａｓｃｏｍｏｓｕｓ）根围土壤中采集到的微针垫刃线虫新种（Ｔｙｌｅｎｃｈｕｓｓｔｙｌｏｌｕｓｎ．ｓｐ．）。此新种以极短的口针（ｓｔｙｌｅｔ＝６．４（６．０～６．５）μｍ）区别于垫刃属中其他已知种。此新种最接近于新最小垫刃线虫（Ｔ．ｎｅｏｍｉｎｉｍｕｓＳａｖｋｉｎａ，１９８９），它们除了口针特征的区别外，还在角质层环纹、排泄孔位置、卵母细胞排列和后阴子宫囊等特征上存在着明显差异。

Abstract:In the spatial pattem of the eggs of diamondback moth,Plutella xylostella(L.)there was sometimes obvious edge-effect.Based on the relationship between the eggsdensity(De)and the shortest distance(h)of sample point to the border of thearea of the host plant distribution,a new model was developped:De=a+be-ch,whichcould well describe the spatial pattem with edge-effect.In above model,threeparameters all have explicit biological meanings,a,b,and c denote the density whenedge-effect was not exist,the addition of the density when edge-effect reached themaximum,and the coefficient of the decline of edge-effect respectively. Accordingto these parameters,two indices were gained.One was strength of edge-effect(s)(s=b/a),which could be used to analyse the mechanism for the formation of spatialpattern.Another was width of edge-effect stratum(w)(w=ln(10s)/c,which couldserve as a basis for stratified sampling.The procedure of stratification and theoreticalnumber of samples for stratified sampling were also discussed.

Abstract:Analysis of the spatial distribution of Papaya ringspot disease showed that thedistribution pattem of the diseased plants in the field changed with time. At the be-ginning of the disease development,a random pattern was observed,then a clusteringtype of distribution,and an even pattern at the last stage. Based on Fuzzy clusteringmethod, the characteristics of disease spread dynamics in different time were studied.Atthe early epidemic stage when virus-carried alate aphids immigrated into the papayafield,the disease began to develop. In this period,the development of the disease wasmainly the increase of the diseased spots.Later on,after a great amount of vectorsimmigrating into the field,a rapid increase of diseased spots was found to spread allover the field,a rapid increase of diseased spots was found to spread all over thefield.Meanwhile there was a rapid increase in number of the diseased plants.At thelast epidemic stage,the diseased plants increased in number slowly,and a hundredpercent of plants in the field was infected by the disease.

Abstract:species diversity of evergreen broadleaved forest in Babaoshan Nature Reserve,Guangdong,was studied by computing the species diversity index, species evennessand ecological dominance of 26 associations.The species diversity index(Shan-non-Wiener Index) ranged from 2.02 to 4.43,species evenness from 0.54 to 0.24and ecological dominance from 0.06 to 0.17.The species diversity index of low montaneevergreen broadleaved forest in this region,which ranged from 3.22 to 4.43,was simi-lar to that of the lower subtropical evergreen broadleaved forest.The relationship be-tween species diversity and the habitat is also analyzed in this paper.

Abstract:This paper reports the vascular plants resources of The Gaolan Islands in Guangdong Province. As preliminary investigation reveaied 162 families,501 genera and 752 species(including 56 species of cultivited plants);among them 19 families,26 genera and 33species were ferns; 6 families 8 genera and 11 species were gymnosperms; 137 families;467 genera and 708 species were angiosperms. There were 4 precious,rare and endan-gered species; 2 indigenous species; 92 timber species; 235 medicinal plants 58 wild orna-mental plants.The natural vegetation consisted of evergreen broad-leaved forest ever-green bushland,mangrove thickets and grassland.

Abstract:In this paper five new taxa of Rubiaceae from China,i.e. Hedvotis lianshanensis.H.baotingensis,H.cantonensis,H. dianxiensis,H.yangchunensis and Neanotis ingrataf. parvifolia are described and illustrated.

Abstract:杉木枯梢病是一种新的危害性较大的苗期病害。该研究对受侵杉苗病组织进行分离、培养、纯化及接种和比较致病性试验，根据病原菌形态特征和致病性测定结果，鉴定其病菌是甘蔗二极霉（Ｂｉｐｏｌａｒｉｓｓａｃｃｈａｒｉ（Ｅ．Ｂｕｔｈｅｒ）Ｓｈｏｅｍ），这是国内外该菌在杉科植物上的首次报道。

Abstract:The micromorphological charateristics of variegated horizon in profiles of Quaternaryred clay were studied and reported in this paper.The results were as follows:Invariegated horizon,the skeleton grain,with porphritic distribution,was dominated byquartz;the soil body had typical prismatic structure for high development of macro-fissure,the soil matrix was composed of three types which varied in micromorpholo-gical feature and were in the course of dynamic equilibrium;and ferran could becommonly observed in the soil body.

Abstract:Measurement of the magnetic properties in the field and laboratory analysis were adopted for studying the magnetic variation of the main rocks and soils.andthe relationship between organic carbon and mangetic susceptibity in Guangdongprovinee.the results showed that the magnetic susceptibility of each rock and soil typewas very different,the order of magnetic susceptibility being basalt>granite>quartzite,laterite>lateritic red earth>paddy soil.The magnetic susceptibility showeda significantly positive correlation with the organic carbon of dry land,and asignificantly negative correlation for paddy soil.

Abstract:选取第四纪红色粘土母质发育的不同肥力红壤样品，利用超声波分散技术分离出不同粒级有机无机复合体，进行氮素分布、铵吸附和解吸特性的研究。结果表明：全氮、重组氮和碱解氮主要分布在＜５μｍ各粒级复合体中，它们的富集率在＜２μｍ和２～５μｍ粒级复合体中大于１；而在５～１０μｍ和１０～５０μｍ复合体中小于１。全氮、重组氮和碱解氮的富集率随复合体粒级增大而减少。高肥力红壤各粒级有机无机复合体的铵吸附量、铵解吸量和铵解吸率均大于低肥力红壤。随着复合体粒级增大，铵吸附量和铵解吸量减小，铵解吸率增大。

Abstract:The allelopathic effects of Bidens pilosa aqueous extracts in different months within ayear on seed germination and seedling growth of radish,rice and cucumber weretested.The studies indicated that allelopathic effects of Bidens pilosa aqueous extractsin different months on seedling growth of the three receptor plants,were variable. such change exhibited significant negative correlation with the monthly rainfall beforethe harvest of plant materials.When rainfall of the previous month was high,theinhibitory effects was weak.When the rainfall was low,the inhibitory effect was strong.

Abstract:紫花芒果的果实生长呈双Ｓ型，分为四个发育阶段，即初始有限生长期（０期）、第一迅速生长期（Ⅰ期）、缓慢生长期（Ⅱ期）和第二迅速生长与成熟期（Ⅲ期）。０期长短与花开放日期有关。其余各期的持续时间分别是３９．７和４９ｄ。Ⅰ期主要是果实大小增长，果长达到成熟时的８８．０％。干物质主要在Ⅲ期累积。纤维质的内果皮（种核）在Ⅱ期硬化，落果主要在谢花后５周内，以２周内最多。紫花芒果有熟前落果现象。果实发育期９５～１３８ｄ。

Abstract:应用脱氨几丁质亲和层析直接从萝卜叶粗提液中制备溶菌酶，所得精酶比活力为４２１６２Ｕ／ｍｇ蛋白，活力回收为６５％，得率为１Ｏ．６μｇ／ｇ鲜叶，纯化倍数为７７．４倍。效果优于应用几丁质、ＣＭ－几丁质的纯化效果。

Abstract:Analysis with methods of quantitative genetics and statistics was done on thereults of 36 hybrid combinations from 6 parental varieties in complete dialledcrossing.There was variation in the occurrence of unlaid egg both among par-ents and F1.The number of the unlaid eggs depended on the geneticcombination. The figure in Japanese hybrid tended to be higher.The analysisshowed that there was no corelationship between fecundity and unlaid egg ra-tio.If the unlaid egg ratio was high in the parents,the same would happen intheir off springs.The inheritance of the unlaid egg ratio is super-dominant,withdominant effect greater than additive effect.The frequency of donunant genes washigher than that of recessive genes in the parents.It is soggested that the nulnber ofgenes is 3 pairs.

Abstract:以不同抗青枯病水平的番茄品种（品系）进行５×５双列杂交的遗传分析表明，番茄对青枯病的抗性至少由３对基因控制；在抗性遗传效应中，加性成分占主导地位；广义遗传力为９７．０％，狭义遗传力为６９．０％；抗病对感病为不完全显性；湘引和亚鲜具较多的正效基因，对于加强它们杂交后代的抗性水平有较高的一般配合力。，区组间Ｆ＝２．１１０，表明５×５完全双列杂交的２５个遗传型间Ｑ值差异很显著。可作进一步分析。２．１协方差（Ｗｒ）对方差（Ｖｒ）的回归分析５个亲本家系的方差（Ｖｒ）及各亲本家系Ｆ１与其轮回亲本间的协方差（Ｗｒ）列于表２。据表２的资料，求得Ｗｒ随Ｖｒ的回归直线为Ｗｒ＝０．３４＋０．９５Ｖｒ，回归系数ｂ＝０．９５，达到极显著水平，很接近Ｈａｙｍａｎ模型中的回归系数期望值Ｂ，表明本研究符合Ｈａｙｍａｎ模型。以Ｗｒ为纵坐标．Ｖｒ为横坐标，作回归直线Ｗｒ＝０．３４＋０．９５Ｖｒ及抛物线Ｗｒ＝为亲本的表现型方差，其值为１８．５），该抛物线为限制各亲本家系的（Ｗｒ，Ｖｒ）点可能出现的区域，它给出了任何Ｖｒ，Ｗｒ的最大值（图１）。２．１．１各亲本的基因分布沿着回归直线，携带最多正效基因的亲本最接近原点，携带最多负效基因的亲本离原点最

Abstract:Land rent was calculated according to the basic before-tax profit,sitecoefficient,regional coefficient and increase of transportation expenses as a re-sult of land productivity.Then the forest land price was calculated with themethod of returning land rent to capitality,and calculating formula and pro-cedure of forest land pricing put forward.

Abstract:以Ｍｅｔｒｏｐｏｌｉｓ蒙特卡罗模拟方法考察了在２０×２０正方格子上的二维伊辛自旋模型，得到了该模型不同温度下自旋状态的图样，符合统计力学分析。

Abstract:介绍了国内外葫芦科瓜类上镰刀菌枯萎病菌各专化型的致病性，着重介绍了冬瓜专化型。并指出在我国，当前对葫芦科瓜类专化型的研究中，ＡｒｍｓｔｒｏｎｇＧ．Ｍ＆ＡｒｍｓｔｒｏｎｇＪ．Ｋ．１９７５年提出的５点注意仍然值得重视，特别是“适当的寄主年龄”。最后对采用瓜类专化型表达了作者的意见。