文献类型：期刊文献

中文题名：白刺光合生理特性对人工模拟增雨的响应

英文题名：Light Responses of Nitraria tangutorum to Rain Addition Treatments

作者：何季[1] 吴波[1] 贾子毅[1] 曹燕丽[1] 姚斌[1]

第一作者：何季

机构：[1]中国林业科学研究院荒漠化研究所,国家林业局林木培育重点实验室,北京100091

年份：2013

期号：1

起止页码：58-64

中文期刊名：林业科学研究

外文期刊名：Forest Research

收录：CSTPCD;;Scopus;北大核心:【北大核心2011】；CSCD:【CSCD2013_2014】；

基金：中央级公益性科研院所基本科研业务费专项资金重点项目(CAFYBB2007008);林业公益性行业科研专项(201104077)

语种：中文

中文关键词：白刺;光响应曲线;光合作用;蒸腾作用;水分利用效率

外文关键词：Nitraria tangutorum; light response curve; photosynthesis; transpiration; water use efficiency

分类号：S718.43

摘要：在乌兰布和沙漠东缘即内蒙古磴口县,利用Li-6400xt便携式光合测定系统分析仪测定不同增雨处理(4个增雨处理的增雨量分别是当地年降水量的25%、50%、75%和100%)条件下,典型荒漠植物白刺的光响应曲线,采用非直角双曲线模型对曲线进行拟合,计算最大净光合速率(Amax)、表观量子效率(AQY)、暗呼吸速率(Rd)、光补偿点(LCP)以及光饱和点(LSP)等生理参数,研究白刺光合生理特性对人工模拟增雨的响应。结果表明:对照的Amax、AQY、Rd、LCP和LSP分别为13.41μmol.m-2.s-1、0.029 mol.mol-1、0.61μmol.m-2.s-1、20.63μmol.m-2.s-1和481.85μmol.m-2.s-1。增雨使白刺的净光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Gs)、Amax、AQY和Rd升高,使水分利用效率(WUE)降低。增雨处理在一定程度上改变白刺的光合生理特性,提高白刺的光合生产能力。对胞间CO2浓度和气孔限制值的变化分析表明:气孔因素是限制光饱和阶段光合速率的主要因素。
Light response curves of a typical desert plant Nitraria tangutorum under four rain addition treatments （ ＋25% , 50% , 75% and 100% of local mean annual precipitation） were measured with Li-6400xt Portable Pho- tosynthesis Analyzer at the eastern edge of the Ulanbuh Desert, Dengkou, Inner Mongolia. The photosynthesis curves of light intensity were simulated by non-rectangle hyperbolic function and the parameters of photosynthesis were calculated to explore light response characteristics of N. tangutorum to different rain addition treatments. The parameters include the maximum net photosynthetic rate （Amax）, apparent quantum yields （AQY）, dark respirato- ry rates （Rd）, light compensation points （LCP） and light saturation points （LSP）. Under the controlled condition, the A max, A QY, Rd, LCP and LSP are 13.41μmol·m^2·s^-1 0. 029 mol ·mol^-1 0. 61 μmol·m^2·s^-1 20. 63 μmol·m^2·s^-1 and 481.85 μmol·m^2·s^-1, respectively. The results show that the net photosynthetic rate （Pn）, transpiration rate （Tr）, stomatal eonductance （Gs）, the maximum net photosynthetic rate, apparent quantum efficiency and dark respiration rate increased, but the water use efficiency decreased with the rain addition treatments. Therefore, the rain addition changed the physiological characteristics and improved photosynthetic ca- paeity level of N. tangutorum in varying degrees. The results also show that stomatal conductance is the main factor limiting the photosynthetic rate at the stage of light saturation.