干旱胁迫对3种桉树苗木耗水特性的影响
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亚热带农业生物资源保护与利用国家重点实验室开放课题“桉树水分利用效率及影响因子研究”(KSL-CUSAb-2012-07)


Effects of drought stress on water consumption characteristics of three Eucalyptus seedlings
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    【目的】评价3种桉树Eucalyptus在不同土壤水分条件下的耗水特征及能力差异,为苗木高效定向培育打下基础.【方法】以2种尾巨桉E. urophylla×E. grandis无性系(DH33-27和DH32-29)和巨桉E. grandis无性系(H1)为对象,在不同土壤体积含水量情况下,通过盆栽试验测定3种苗木的耗水量和耗水速率,利用Li-6400便携式光合作用分析系统测定相应时期各苗木的水分利用效率(WUE).【结果和结论】结果表明,在水分充足条件下,尾巨桉DH33-27具有较高的耗水量[(162.56±8.71)g·株-1],但受到干旱胁迫时,其耗水量大幅下降,严重干旱胁迫时期,耗水量降至(10.83±1.01) g·株-1,为3个品系中最低;耗水速率与耗水量的变化趋势相近,表现为在水分充足条件下,尾巨桉2种无性系具有较高的耗水速率,当受到干旱胁迫时,耗水速率大幅下降,此时巨桉H1的白天平均耗水速率仍保持较高的水平.不同时期,3种桉树品系的耗水速率日变化均呈“单峰”曲线变化,水分利用效率由大到小依次为:尾巨桉DH33-27>尾巨桉DH32-29>巨桉H1.综上所述,相比尾巨桉DH33-29和巨桉H1,尾巨桉DH33-27是高水分利用效率的品系,不仅适宜在水分条件好的地区大面积推广,也适宜在水分严重亏缺的地区种植.

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    【Objective】 The water consumption characteristics and their differences were estimated under different soil water conditions to provide a guidance for culturing effectively seedlings.【Method】The diurnal variation of water consumption (WC) and water consumption rate (WCR) of two kinds of Eucalyptus urophylla×E. grandis (DH33-27 and DH32-29) and E. grandis (H1) clonal seedlings in different soil moisture contents were measured using pot experiment, and the water use efficiency (WUE) was measured using Li-6400 portable photosynthesis analysis system, respectively. 【Result and conclusion】The results showed that E. urophylla×E. grandis DH33-27 seedlings had the highest WC,(162.56±8.71) g·plant-1, among these three Eucalyptus seedlings. When subjected to serious drought, its WC value decreased to (10.83±1.01) g·plant-1 which was the lowest. The similar variation trends of the WCR and WC were found: Two E. urophylla×E. grandis seedlings had high value under sufficient moisture and then decreased sharply under drought stress, but the average WCR of E. grandis still remained high. The diurnal change of WCR of these three Eucalyptus seedlings all followed the curve with one peak in different periods. The order of WUE of these three Eucalyptus seedlings was as follows: E. urophylla×E. grandis DH33-27> E. urophylla×E. grandis DH32-29> E. grandis. In conclusion, compared with E. urophylla×E. grandis DH32-29 and E. grandis, E. urophylla×E. grandis DH33-27 has higher photosynthesis and WUE, which is recommended to plant widely in both humid and arid regions.

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余斐,华雷,李吉跃,何茜,苏艳.干旱胁迫对3种桉树苗木耗水特性的影响[J].华南农业大学学报,2015,36(6):98-103

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  • 收稿日期:2014-11-20
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  • 在线发布日期: 2015-11-03