| 东江中上游4树种水势日变化特征及其与环境因子的关系 |
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| 引用本文： | 李召青,张卫强,殷祚云,曾令海,周平,王明怀.东江中上游4树种水势日变化特征及其与环境因子的关系[J].水土保持研究,2011,18(1):243-247,267. |
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| 作者姓名： | 李召青 张卫强 殷祚云 曾令海 周平 王明怀 |
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| 作者单位： | 广东省林业科学研究院,广州,510520 |
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| 基金项目： | 国家科技支撑项目(2006BAD03A1805); 广东省科技计划项目(2009B020303006); 广东省林业科技计划项目(2008-08) |
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| 摘 要： | 在东江中上游,以6a生树种木荷、红锥、火力楠和藜蒴为材料,采用PSYPRO露点水势仪对4树种在旱季与雨季的土水势、根水势、茎水势和叶水势日变化过程进行了测定,探讨了4树种在自然生境下的水势梯度变异及叶水势与气象因子的关系。结果表明,叶水势日变化均呈"单峰"型曲线,日均值表现为木荷>火力楠>红锥>藜蒴,旱季叶水势明显低于雨季;叶水势与大气温度(Ta)和光合有效辐射(PAR)呈极显著负相关(P<0.01),而与空气相对湿度(RH)和大气水势(Фa)呈极显著正相关(P<0.01),气象因子对东江流域主要造林树种叶水势直接作用由大到小结果如下:火力楠和藜蒴(Ta>RH>Фa>PAR),红锥(RH>Фa>Ta>PAR),木荷(Ta>Фa>RH>PAR)。
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| 关 键 词： | 水势梯度 环境因子 东江中上游 |
Diurnal Changes of Water Potential of the Four Tree Species and Its Relationships with Environmental Factors in the Upper and Middle Reaches of Dongjiang River |
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| LI Zhao-qing,ZHANG Wei-giang,YIN Zuo-yun,ZENG Ling-hai,ZHUU Ping,WANG Ming-huai.Diurnal Changes of Water Potential of the Four Tree Species and Its Relationships with Environmental Factors in the Upper and Middle Reaches of Dongjiang River[J].Research of Soil and Water Conservation,2011,18(1):243-247,267. |
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| Authors: | LI Zhao-qing ZHANG Wei-giang YIN Zuo-yun ZENG Ling-hai ZHUU Ping WANG Ming-huai |
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| Institution: | LI Zhao-qing,ZHANG Wei-qiang,YIN Zuo-yun,ZENG Ling-hai,ZHOU Ping,WANG Ming-huai(Guangdong Academy of Forestry,Guangzhou 510520,China) |
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| Abstract: | By using PSYPRO water potential apparatus,six-year-old Schima superba,Castanopsis hystrix,Michelia macclurel,and Castanopsis sfissa,in the upper and middle reaches of Dongjiang River were selected as experimental materials to measure diurnal changes of soil water potential,root water potential,stem water potential,and leaf water potential of four tree species in rainy and dry season,and study on the variations of water potential gradient,and analyze the relationship between leaf water potential and meteorol... |
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| Keywords: | water potential gradient environmental factors the upper and middle reaches of Dongjiang river |
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