%0 Journal Article
%T Grassland response to drought in northern China<br>中国北方草原对气候干旱的响应
%A WANG Hong
%A LI Xiao-Bing
%A LI Xi
%A WANG Dan-Dan
%A <br>王宏
%A 李晓兵
%A 李霞
%A 王丹丹
%J 生态学报
%D 2008
%I 
%X Dynamic variation of grassland growth is influenced and restricted by climatic conditions.However,it mainly depends on moisture condition.To clarify preferably relations between grassland growth and drought,we adopted NDVI(Normalized Difference Vegetation Index) representing variation of grassland growth and SPI(Standardized Precipitation Index) characterizing drought to study linear relations between desert,type,meadow steppe and drought.The results showed that seasonal drought had great influence on dynamics of desert steppe growth,whereas,short-term,medium-term and long-term drought had little influence.Dynamics of typical steppe growth showed a strong response to seasonal drought,a lower response to short-term,medium-term and long-term drought.Dynamics of meadow steppe growth indicated clearly a strong response to seasonal drought and long-term drought.It was found to have lag effects of precipitation on grassland,cumulative effects of abundance and lack of moisture on grassland.Simulated response relation grassland NDVI to SPI by regression model containing dummy variables and simple regression model respectively,goodness of fit occurred in regression model with dummy variables.It was concluded that dynamic variation of grassland growth response to drought had seasonal effects.
%K grassland in northern China
%K drought
%K NDVI
%K SPI<br>中国北方草原
%K 干旱
%K NDVI
%K SPI
%K 中国
%K 北方草原
%K 气候干旱
%K 气候响应
%K northern
%K China
%K drought
%K response
%K 累积效应
%K 拟合度
%K 显示
%K 响应关系
%K 模拟
%K 简单回归模型
%K 虚拟变量
%K 水分盈亏
%K 时滞效应
%K 降雨量
%K 季节性干旱
%K 干旱影响
%K 线性关系
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=FE163E5DB2274E5937319DE98913EC37&aid=CB40643CF0E6BEEC67EA64EFC9CA3D6C&yid=67289AFF6305E306&vid=D3E34374A0D77D7F&iid=CA4FD0336C81A37A&sid=76D6CC7DFC6FAFC6&eid=2B669C9EDEA8BB1FACE48373F52134C6&journal_id=1000-0933&journal_name=生态学报&referenced_num=2&reference_num=38