贝加尔针茅草原生态系统生长季碳通量及其影响因素分析  

Variation of net ecosystem carbon flux and its impact factors on Stipa baicalensis steppe in the growing season

作　　者：徐丽君[1] 唐华俊[1] 杨桂霞[1] 王旭[1] 王波[2] 辛晓平[1] 

机构地区：[1]农业部资源遥感与数字农业重点开放实验室呼伦贝尔国家野外站中国农业科学院农业资源与农业区划研究所,北京100081 [2]中国工程院咨询服务中心,北京100088

出　　处：《草业学报》2011年第6期287-292,共6页Acta Prataculturae Sinica

基　　金：草畜业数字化管理与优化决策技术研究(2007AA10Z230);现代农业产业技术体系建设专项资金资助

摘　　要：以贝加尔针茅草原为研究对象,利用涡度相关通量测量系统,测定CO2通量及其影响因子。结果表明,贝加尔针茅草原CO2通量存在明显的日、季变化,不同生育阶段CO2通量日、季变化呈"U"型,其中以7月最为明显,CO2通量固碳、释放碳最大值均出现在7月,分别为-0.56和0.83mg/(m2.s)。潜热通量、显热通量、有效光合辐射与CO2通量显著相关,与土壤温度、土壤含水量相关不显著。CO2 flux and its impact factors were measured by an eddy correction system in Stipa grassland.There were distinct diurnal and seasonal variations with an inverted U-shape diurnal change in CO2 flux.There was obvious change in July,and the maximum uptake and emission were-0.56 and 0.83 mg/（m2·s）,respectively.Latent heat flux,sensible heat flux,net radiation flux and photosynthetic active radiation were related to CO2 flux.There was no obvious correlation between soil temperature and soil water content with CO2 flux.

关 键 词：贝加尔针茅草原 涡度相关技术 CO2通量 环境因子 

分 类 号：S812[农业科学—草业科学]