Photosynthesis responses to various soil moisture in leaves of Wisteria sinensis  

作　　者：ZHANG Shu-yong XIA Jiang-bao ZHOU Ze-fu ZHANG Guang-can 

机构地区：[1]Research Institute of Forestry, Chinese Academy of Forestry, Beijing, 100091,P, R, China [2]Key Laboratory of Tree Breeding and Cultivation, State Forestry Administration, Beijing, 100091, P, R, China [3]Research Center for Eco-Environmental sciences Yellow River Delta, Binzhou University, Binzhou, 256603, Shandong, P, R, China [4]College of Forestry, Shandong Agricultural University, Tai＇an, 271018, Shandong, P, R, China

出　　处：《Journal of Forestry Research》2007年第3期217-220,共4页林业研究（英文版）

基　　金：This research was supported by National Key Sci-ence and Technology Item in "11th five year" period (No.2006BAD03A1205);Shandong Superior Industrial Item in "Breed-ing and Industrial Exploitation of Superior Liana,Adapting to Afforest-ing Barren Mountain".

摘　　要：A study was conducted to determine the fitting soil moisture for the normal growth of two-year-old W. sinensis （Sims） Sweets by using gas exchange technique. Remarkable threshold values of net photosynthetic rate （Pn）, transpiration rate （Tr） and water use efficiency （WUE） were observed in the W. sinensis leaves treated by various soil moisture and photosynthetic available radiation （PAR）. The fitting soil moisture for maintaining a high level of Pn and WUE was in range of 15.3%-26.5% of volumetric water content （VWC）, of which the optimal VWC was 23.3%. Under the condition of fitting soil moisture, the light saturation point of leaves occurred at above 800μmol.m^2.s^-1, whereas under the condition of water deficiency （VWC, 11.9% and 8.2%） or oversaturation （VWC, 26.5%）, the light saturation point was below 400μmol.m^-1.s^-1. Moreover, the light response curves suggested that a special point of PAR occurred with the increase in PAR. This special point was considered as the turning point that indicated the functional transition from stomatal limitation to non-stomatal limitation. The turning point was about 600, 1000, 1000 and 400 μmol.m^-2.s^-1, respectively, at VWC of 28.4%, 15.3%, 11.9% and 8.2%. In conclusion, W. sinensis had higher adaptive ability to water stress by regulating itself physiological function.研究被进行为二岁的 W 的正常生长决定恰当的土壤潮湿。由使用气体交换技术的 sinensis (Sims ) 糖果。网的显著阀值价值光合的率(Pn ) ，蒸发率(Tr ) ；水使用效率(WUE ) 在 W 被观察。sinensis 叶子由各种各样的土壤潮湿对待；光合的可得到的放射(同等) 。为维持 Pn 的高水平的恰当的土壤潮湿；WUE 在范围 15.3%26.5% 容量的含水量(VWC ) ，哪个最佳的 VWC 是 23.3% 。在恰当的土壤潮湿的条件下面，叶子的光饱和点发生在上面 800 μ m ol · m [2 ]· s [1 ] 在水缺乏的条件下面(VWC， 11.9% ；8.2%) 或在浸透上(VWC， 26.5%) ，光饱和点在 400 μ m ol · m 下面[2 ]· s [1 ] 。而且，轻反应曲线建议同等的一个特殊的点随同等的增加发生了。这个特殊的点被看作从有气孔的限制显示了功能的转变到非有气孔的限制的转弯的点。转弯的点是大约 600， 1000， 1000；400 μ m ol · m [2 ]· s [1 ] ，分别地在 28.4% 的 VWC， 15.3% ， 11.9% ；8.2% 。在结论， W。sinensis 有更高适应的能力由调整自己生理机能浇应力。

关 键 词：Net photosynthetic rate Soil moisture Photosynthetic available radiation Water use efficiency Wisteria sinensis 

分 类 号：S714[农业科学—林学]