施氮对不同强度紫外线辐射下珙桐幼苗水分状况的影响  

Responses of Nitrogen to Water Regime of Davidia involucrata under Different UV-B Exposures

作　　者：高菊[1,2] 王琼[1] 李艳[2] 

机构地区：[1]西华师范大学生命科学学院,四川南充637002 [2]绵阳师范学院生态安全与保护四川省重点实验室,四川绵阳621000

出　　处：《绵阳师范学院学报》2013年第2期69-75,共7页Journal of Mianyang Teachers＇ College

基　　金：四川省教育厅项目(11ZB136);四川省教育厅彝族文化中心项目(YZWH1127);生态安全与保护四川省重点实验室开放项目(ZDS1005);绵阳师范学院校级课题(2012A03)

摘　　要：珙桐是我国珍稀濒危保护植物,本研究以珙桐三年生幼苗为研究对象,探讨了施氮情况下,紫外线升高和降低对珙桐水分状况的影响.结果表明:紫外线升高或紫外线降低对珙桐叶片组织含水量无显著影响,但紫外线升高或紫外线降低均会使叶片相对含水量显著升高,水分饱和亏显著降低;施氮与紫外线升高的交互作用对珙桐幼苗叶片的水分状况无显著影响;施氮与紫外线降低的交互作用会使组织含水量升高,相对含水量显著降低,水分饱和亏显著升高.Davidia involucrata Bill （Davidiaceae） is a rare and endangered tree species in China. In this study the effects of ambient UV - B increased UV - B and decreased UV - B radition on water condition of 3 - year - old Davidia involucrata saplings growing under current and increased nitrogen conditions （25 g m a- N） have been compared. The results show that the increased UV - B or the decreased UV - B radiation had no significant influence on the water content of leaves, while the relative water content （RWC） was increased and the water saturation deficit （WSD） was declined under the both changed UV - B radiation conditions. There was a significant interaction effect of nitrogen application and decreased UV - B radiation. RWC was increased significantly and the WSD was decreased under the condition of decreased UV - B radiation, whereas the converse occurred （RWC declined and WSD increased significantly） after the nitrogen added.

关 键 词：珙桐 紫外线B N 水分状况 

分 类 号：Q945.78[生物学—植物学]