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Position: Home > Articles > Effects of Soil Moisture Variation on the Daily Dynamics of Photosynthesis of Rhus typhina Journal of Henan Agricultural Sciences 2011,40 (8) 183-187+191

土壤水分变异对火炬树光合作用日变化的影响

作  者:
郭二辉;田朝阳;刘保国
单  位:
河南农业大学林学院;河南农业大学生命科学学院
关键词:
火炬树;城市-郊区土壤水分变异;光合作用特征;日变化规律
摘  要:
通过盆栽模拟对比试验,于2008年8月研究了城市居民区绿地、城区道路绿化带与郊区林地3种土壤条件下的水分变异对火炬树光合作用日变化规律的影响。结果表明:随着模拟的郊区林地(土壤含水量22.63%)-城市居民区绿地(14.21%)-城区道路绿化带(9.90%)的土壤水分含量变化,火炬树的光合速率日变化曲线逐渐从"单峰型"转变成典型的"双峰型",出现了光合午休现象,同时,制约光合速率降低的主要因素也由气孔限制逐步转变为非气孔限制因素。火炬树的光合速率、气孔导度、蒸腾速率和细胞间CO2浓度日平均值均随土壤水分胁迫增强而降低,但不同环境水分下光合气体交换参数变化的幅度不同。随土壤水分梯度的降低,火炬树的水分利用效率有所提高,说明火炬树在城区干旱环境下可以通过降低光合生长、气孔导度和蒸腾耗水,来提高水分利用效率,适应城区的干旱环境。
译  名:
Effects of Soil Moisture Variation on the Daily Dynamics of Photosynthesis of Rhus typhina
作  者:
GUO Er-hui1,TIAN Chao-yang2,LIU Bao-guo2(1.College of Life Sciences,Henan Agricultural University,Zhengzhou 450002,China;2.College of Forestry,Henan Agricultural University,Zhengzhou 450002,China)
关键词:
Rhus typhina;Urban-suburb soil moisture variation;Photosynthetic;Daily dynamics
摘  要:
Through the comparative experiments,we studied the influence on the leaf daily dynamics of photosynthetic of Rhus typhina with the change of moisture's content in three different kinds of soil:suburban forest land,urban inhabited-area green space and the road greenbelts in August 2008 by using Li-6400 portable photosynthesis system.The results showed:Along with changes of the suburban-urban moisture gradient,the diurnal variation curve of photosynthetic rate of Rhus typhina gradually shifted from a typical single peaked curve to a double peaked one that signifies midday depression of photosynthesis.At the same time,according to the criteria suggested by Farquhar and Sharkey,the main factors affecting midday photosynthesis rate changed from stomata limitation to non-stomata limitation.The data of photosynthesis rate(Pn),stomata conductance(Gs),transpiration rate(Tr) and intercellular CO2 concentration(Ci) of Rhus typhina reduced with the strength of drought stress.The variational scope of gases exchange parameter during photosynthesis was different under different soil moisture conditions.With the decrease of soil moisture,the water use efficiency(WUE) of Rhus typhina increased,implying that under the urban arid environment,Rhus typhina could raise the water use efficiency(WUE) and adapted to the arid environment,by reducing the photosynthesis rate(Pn),stomata conductance(Gs) and transpiration rate(Tr).

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