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不同土壤水分条件下紫藤叶片生理参数的光响应
引用本文:夏江宝,张光灿,刘刚,韩炜,陈建,刘霞.不同土壤水分条件下紫藤叶片生理参数的光响应[J].应用生态学报,2007,18(1):30-34.
作者姓名:夏江宝  张光灿  刘刚  韩炜  陈建  刘霞
作者单位:山东农业大学林学院,山东泰安,271018
基金项目:国家科技攻关计划;山东省农业良种产业化工程项目;山东省水土保持生态修复科技探索资助项目
摘    要:测定了不同土壤湿度下2年生紫藤叶片光合速率(Pn)、蒸腾速率(Tr)及水分利用效率(WUE)等生理参数的光响应过程,探讨了紫藤正常生长发育所需的土壤水分和光照条件.结果表明:紫藤叶片的Pn、Tr及WUE对土壤湿度和光照强度的变化具有明显的阈值响应.维持紫藤正常生长(同时具有较高Pn和WUE)的土壤湿度范围为:体积含水量(Wv)15.3%~26.5%、相对含水量(Wr)46.4%~80.3%,最佳土壤湿度约为Wv 23.3%、Wr 70.6%.紫藤叶片对光照环境的适应性较强,在光合有效辐射强度(PAR)为600~1 600 μmol·m-2·s-1时,Pn和WUE具有较高水平,饱和光强在PAR为800~1 000 μmol·m-2·s-1.紫藤叶片光合作用非气孔限制的发生与土壤湿度与光照强度密切相关,Wv为18.4%~26.5%、Wr为55.8%~80.3%时,光合作用主要受气孔限制,光照强度的影响较小;超出此范围后,其受光照强度的影响较大,出现由气孔限制转变为非气孔限制的PAR临界值.紫藤正常生长允许的最低土壤湿度约为Wv 11.9%、Wr 36.1%,允许最高PAR约为1 000 μmol·m-2·s-1,是紫藤叶片光合机构受到破坏的临界点.

关 键 词:紫藤  土壤水分  光合有效辐射  光合速率  水分利用效率
文章编号:1001-9332(2007)01-0030-05
收稿时间:2006-3-20
修稿时间:2006-03-20

Light response of Wisteria sinensis leaves physiological parameters under different soil moisture conditions
XIA Jiang-bao,ZHANG Guang-can,LIU Gang,HAN Wei,CHEN Jian,LIU Xia.Light response of Wisteria sinensis leaves physiological parameters under different soil moisture conditions[J].Chinese Journal of Applied Ecology,2007,18(1):30-34.
Authors:XIA Jiang-bao  ZHANG Guang-can  LIU Gang  HAN Wei  CHEN Jian  LIU Xia
Institution:College of Forestry, Shandong Agricultural University, Taian 271018, Shandong, China
Abstract:With two years old Wisteria sinensis as test material, this paper measured the light response of its leaves net photosynthetic rate (Pn), transpiration rate (Tr) and water use efficiency (WUE) under different soil moisture conditions, aimed to ascertain the optimal soil moisture and light conditions of W. sinensis growth. The results showed that the Pn, Tr and WUE had evident threshold responses to the variations of soil moisture and light intensity. To maintain the normal growth and higher levels P. and WUE of W. sinensis, soil volumetric moisture content (Wr) and relative moisture content (Wv) should be within the range of 15.3%-26.5% and 46.4%-80.3%, and the optimal Wv and Wr were 23.3% and 70.6%, respectively. W. sineasis leaves had stronger adaptability to light conditions. When the photosynthetic active radiation (PAR) was 600-1600 micromol x m(-2) x s(-1), the Pn and WUE were at higher level, and the light saturation points of Pn and WUE were all at about 800-1000 x micromol x m(-2) x s(-1). The appearance of non-stomatal limit was significantly correlated with soil moisture and light intensity. When W, ranged from 18.4% to 26.5%, the decline of Pn was mainly caused by stomatal limit rather than PAR. Out of this range, Pn was obviously affected by PAR, and the critical turning point of PAR was observed with the change from stomatal limit to non-stomatal limit. The minimal values of Wv and Wr for the normal growth of W. sinensis were 11.9% and 36.1%, respectively, and the maximal PAR was 1000 micromol x m(-2) x s(-1), the critical point of detriment in leaf photosynthetic organ.
Keywords:Wisteria sinensis  soil moisture  photosynthetic active radiation  photosynthetic rate  water use efficiency
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