草业学报Issue(2)：240-250,11.DOI:10.11686/cyxb2015163
模拟增温与增雨对克氏针茅光合作用的影响
Effects of simulated warming and precipitation enhancement on photosynthesis of Stipa krylovii
摘要
Abstract
This study was conducted to examine the interactive effects of climate warming and changing precipi-tation on photosynthetic parameters of Stipa krylovii to evaluate the effects of future climate change on a typi-cal steppe environment.Open top chambers (OTCs)were used to simulate warming +2℃,based on the local temperature increase from 1961 to 2010 (IPCC,2007)and precipitation enhancement of +20%,based on the local average monthly precipitation from 1961-2010.The photosynthetic parameters were measured by a port-able gas exchange system (LI-6400)in the growing season of 2012.Warming significantly reduced the photo-synthetic rate (P n )and stomatal conductance (Gs )of S .krylovii,and there was a clear seasonal trend.War-ming reduced P n 17% and 27% and reduced Gs by 24% and 32% in July and September,respectively.Warmingalso reduced the transpiration rate (Tr ),chlorophyll content,the maximum ribulose 1,5-bisphosphate (RuBP) carboxylation rate (V cmax ),RuBP regeneration capacity (J max ),apparent quantum efficiency (AQE)and the maximum photosynthetic rate (P nmax )of S .krylovii.Conversely,water use efficiency (WUE)increased by 16.5%.Precipitation enhancement produced compensatory effects on photosynthesis responses to warming. Precipitation enhancement promote P n ,Gs ,Tr ,chlorophyll content,V cmax ,J max ,AQE and the P nmax of S .kry-lovii but had did not affect WUE.The effects of temperature and precipitation on photosynthesis and WUE of S .krylovii was caused by stomatal and non-stomatal factors.Under warm conditions and precipitation en-hancement,Gs influenced both P n and Tr .No interactive effects were observed.关键词
全球变化/光合作用/克氏针茅/典型草原/模拟增温与增雨Key words
global change/photosynthesis/Stipa krylovii/typical steppe/warming and precipitation enhance-ment引用本文复制引用
闫玉龙,张立欣,万志强,谷蕊,苏力德,杨劼,高清竹..模拟增温与增雨对克氏针茅光合作用的影响[J].草业学报,2016,(2):240-250,11.基金项目
国家科技支撑计划项目（2013BAC09B03）和农业部项目“国家牧草现代产业技术体系”（CARS-35）资助。 （）
