土壤水分对107杨幼苗光合特性影响的研究  

Effects of Soil Water Content on Photosynthetic Characteristics of the Populus×euramericana cv."74/76"Seedlings

作　　者：尹建庭[1] 翟明普[1] 

机构地区：[1]北京林业大学资源与环境学院,北京100083

出　　处：《西北林学院学报》2007年第4期5-8,共4页Journal of Northwest Forestry University

基　　金：农业部科技成果转化项目(05EFN217100430);北京林业大学研究生自选课题基金项目(05jj001)

摘　　要：以1年生盆栽107杨(Populus×euramericana cv."74/76")为试材,共设6个水分梯度,土壤含水量(SWC)分别为7.8%、8.5%、10.1%、11.7%、14.0%和17.1%,处理时间为60 d,研究土壤水分对107杨光合特性的影响。结果表明:107杨幼苗净光合速率(Pn)光响应曲线在不同水分条件下表现不同,各处理的Pn极大值差异显著;随着SWC提高,表观量子效率和光饱和点随之升高,而光补偿点逐渐下降。不同土壤水分条件下,光合日进程表现为双峰或单峰曲线。随着SWC提高,Pn日平均值增加,SWC为10.1%、11.7%和14.0%处理的Pn日平均值与7.0%、8.5%和17.1%,处理的Pn日平均值之间存在极显著差异。SWC与Pn的模拟变化曲线表明,10.1%<SWC<14%是曲线变化"转折区",在该范围内有利于提高107杨幼苗的光能和水分利用效率。认为10.1%<SWC<14%是107杨幼苗较为适宜供水范围。Net photosynthetic rate （Pn） of one-year-old potted Populus x euramericana cv ＂74/76＂ was determined through controlling soil water content（SWC）. There were 6 treatments of SWC （7.8%, 8.5%, 10.1%, 11.7%, 14.0% and 17.1% ） and the treatment time was 60 d. The results showed the curves of Pn response to PAR were different under SWC. The discrepancy of maximum Pn was very obvious under different SWC. Photosynthetic quantum yield and the light saturation points increased with the improvement of soil moisture status but the light compensation points declined. The curve representing the diurnal course of the photosynthetic rate under different SWC was twin or single peaked patterns. The daily average Pn increased with the increase SWC. The discrepancy was very remarkable between the treatments of 10. 1%, 11.7%, 14.0% and the treatments of 7.0%, 8.5%, 17.1%. The relationship model curves of Pn with SWC showed that the range of 10.1% 〈 SWC 〈 14.0 % was transitional range of it, which was favorable to enhance efficiency of light use and water use. It is considered that 10. 1% 〈SWC 〈 14.0 % was the rational water providing range of Populus × euramericana cv. ＂74/76＂ seedlings.

关 键 词：字 107杨 土壤含水量 光响应曲线 净光合速率 

分 类 号：S718.43[农业科学—林学]