%0 Journal Article
%T CHANGES IN PLANT FUNCTIONAL COMPOSITION ALONG GRADIENTS OF PRECIPITATION AND TEMPERATURE IN THE XILIN RIVER BASIN, INNER MONGOLIA<br>内蒙古锡林河流域草原群落植物功能群组成沿水热梯度变化的样带研究
%A BAI Yong-Fei
%A ZHANG Li-Xia
%A ZHANG Yan
%A CHEN Zuo-Zhong
%A <br>白永飞
%A 张丽霞
%A 张焱
%A 陈佐忠
%J 植物生态学报
%D 2002
%I Editorial Office of Chinese Journal of Plant Ecology
%X Using a transect approach, we investigated changes in plant functional composition of 16 steppe communities along the gradients of precipitation and temperature in the Xilin River Basin, Inner Mongolia. The plant species within each community were classified into functional groups based on differences in life form and ecological group. The results showed that among five plant life form functional groups, the relative abundance of perennial bunchgrasses increased with a decrease in elevation and mean annual precipitation, and with an increase in mean annual temperature and aridity. The relative abundance of forbs showed a reverse trend with the relative abundance of perennial bunchgrasses. Among four ecological groups, the xerads increased significantly along the ecological gradients of transect, while intermediate xerads declined rapidly. The relative abundance of grazing intolerant species was significantly higher in fenced plots and mowing fields than in grazing fields, while the relative abundance of grazing tolerant species was significantly higher in grazing fields than in fenced plots and mowing fields. The effects of soil organic carbon and total soil nitrogen content on the relative abundance of forbs and perennial bunchgrasses within plant life form functional groups, and on the relative abundance of xerads and intermediate xerads within ecological groups under different land use intensities are nonlinear. Our results suggest that structural and compositional simplification due to the effects of decreased precipitation and increased land use intensities along the ecological gradients of the transect may further lead to a decrease in community productivity and stability.
%K Precipitation and temperature gradients
%K Grassland communities
%K Plant functional composition
%K Ecological replacement<br>水热梯度
%K 草原群落
%K 植物功能群组成
%K 生态替代
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=2F2173CCFF292BF447DC2681EA33BBAE&aid=5F61A40D6FE5DD88&yid=C3ACC247184A22C1&vid=96C778EE049EE47D&iid=38B194292C032A66&sid=51C74DF6A16DA45B&eid=EC34D52BE81085CE&journal_id=1005-264X&journal_name=植物生态学报&referenced_num=30&reference_num=36