生态学杂志2012，Vol.31Issue(1)：74-80,7.
土壤水分对冬小麦生育后期叶片气体交换及叶绿素荧光参数的影响
Effects of soil moisture on leaf gas exchange and chlorophyll fluorescence parameters of winter wheat during its late growth stage
摘要
Abstract
A plot experiment with rainproof installation was conducted to study the effects of different soil moisture regimes on the leaf gas exchange and chlorophyll fluorescence parameters of winter wheat during its late growth stage. Five treatments were installed, I. E. , natural soil mois ture regime (CK) , soil water supply coefficient (Kw) of 0. 8, 0. 6, 0. 4 and 0. 2, respectively. The leaf chlorophyll content in Kw = 0. 6 was close to that in Kw = 0. 8, and significantly higher than that in other treatments (p<0.05). In Kw =0. 6, the leaf stomatal conductance and transpi ration rate were mildly inhibited, while the photosynthetic rate was higher than that in Kw = 0. 8. In Kw = 0. 2, the photosynthetic rate, stomatal conductance, and transpiration rate were the lowest. The stomatal limitation was the highest in Kw =0. 4, followed by in Kw =0. 2, and smallest in Kw =0. 8. Treatment of Kw =0. 4 had the highest apparent quantum efficiency. Overall, the light compensation point decreased with decreasing soil moisture content, but the light saturation point and the maximum photosynthetic rate were the highest in Kw=0.6, followed by in Kw = 0. 8, and lowest in Kw=0.2. The antenna transfer efficiency (Fv'/Fm') , electron transfer rate (ETR) , actual quantum efficiency of PSII (ΦPSII) , and photochemical quenching (qP) were the highest inKw = 0. 6, followed by in Kw = 0. 8 , and lowest in Kw = 0. 2. It was inferred that in Kw - 0. 2, the photosynthetic rate of winter wheat was mainly limited by non-stomatal limitation factors, whereas in Kw = 0.4, the photosynthetic rate was mainly controlled by stomatal limitation factors.关键词
土壤水分/冬小麦/光合作用/叶绿素荧光/气孔/光系统Key words
soil moisture/winter wheat/photosynthesis/chlorophyll fluorescence/stoma/photosystem分类
农业科技引用本文复制引用
李永秀,申双和,李丽,汪秀敏,张富存,韩小梅..土壤水分对冬小麦生育后期叶片气体交换及叶绿素荧光参数的影响[J].生态学杂志,2012,31(1):74-80,7.基金项目
国家重点基础研究发展计划项目(2010CB950702)和公益性行业(气象)科研专项(GYHY201106043)资助. （2010CB950702）
