干旱区生态环境知识资源中心(Arid): 气候变暖对青藏高原腹地高寒植被的影响

Arid

	气候变暖对青藏高原腹地高寒植被的影响
其他题名	The effects of climate warming on the alpine vegetation of the Qinghai-Tibetan Plateau hinterland
	王谋 1; 李勇 2; 黄润秋 3; 李亚林 1
来源期刊	生态学报
ISSN	1000-0933
出版年	2005
卷号	25 期号:6 页码:1275-1281
中文摘要	研究区高寒植被碳同位素组成的研究，表明气候环境对高原腹地植被具有明显的控制意义。在此基础上，通过对研究区植被样方的研究，对该区植被在高原气候暖干化过程中的变化趋势进行了探讨。提出暖干化的气候(环境是区域植被退化的主因，并对研究区植被退化速率进行了推算(14．2km／10a)。以样方数据分析为依托，重新拟定了研究区内干旱湿润区分界线，获得该区植物碳同位素值拟合干湿界限的支持。通过对年代间干湿分界线位置的比较，对高原气候暖干化模式下植被的退化趋势进行了模拟。
英文摘要	There is growing evidence within the environmental science community that our planet has entered a potentially i-atastrophic phase of human-induced global climate warming. Climatic studies demonstrate that the Qinghai-Tibetan Plateau has also exhibited a warming and drying trend in recent decades. We studied an area on the Tibetan Plateau located in the transition zone between Alpine Meadow and Alpine Steppe regions. Such zones are highly sensitive to environmental change and the concomitant adjustment of vegetation in these hinterland areas of the plateau can reflect adaptation of plant ecological systems to changes in the climatic setting. In order to demonstrate whether the Alpine vegetation of the study area displays a response to changing environmental conditions, and whether the variation in the environmental conditions is reflected in changes in the physiology and forms of the Alpine floral assemblage, we studied the carbon isotopic values of these plants. Carbon isotope fractionation variations within the plants can reflect arid or moist environmental conditions attained during the growth period of the plants. We carried out a regression analysis on the experimental carbon isotope results, taking into account their geographical position. The analytical results showed that the S"C values of K. fiygmaea correlate with the changing SE-NW trend of precipitation. (R = 0. 44603, n = 29, /><()? 05), which indicates that the vegetation has adapted to variations in environmental conditions. We also surveyed floral assemblages at sites within the transition zones, and carried out principal component and cluster analyses on the vegetation indexes of these sites to identify the migration of the boundary between Alpine Steppe and Alpine Meadow caused by climate warming and drying. The migration of the boundary indicates the expansion of the arid /.one nt a rate of 14. 2 km per decade and the accompanied degeneration of vegetation in the broader central Plateau area. The spread of the Alpine Steppe has not only resulted in a drop in the overall vegetation coverage in this region, but has also caused a drop in the total biomass of the surface vegetation in the area. Study of the biomass of the Alpine Steppe and Alpine Meadow communities shows that tlu-total biomass of the Alpine Steppe community in the study area is 77 % of that of the Alpine Meadow community. Based on the observed responses of floral carbon isotopic compositions to varying environmental influences, this study has been able to quantify the changing trend of vegetation types and quality on the Tibetan Plateau during recent climate warming and drying. Through the integration of previous studies of plant ecology in the study area with our own research, we propose that the change to a warmer and dryer climatic environment is the main cause of progressive degeneration of ihe vegetation in the study area. Taking into account current climate change models, our simulations of future changing surface vegetation demonstrate that if the warming and drying trend continues unchecked, the vegetation degeneration rale will accelerate. This will not only have a negative influence on the biodiversity of the Tibetan Plateau, but the reduction of the biomass of tin-surface plants will also have a negative influence on the local pastoral economy.
中文关键词	青藏高原腹地 ; 高寒植被 ; 碳同位素 ; 环境条件 ; 暖干化 ; 适应
英文关键词	Qinghai- Tibetan Plateau carbon isotopes environmental conditions global warming warming and drying trend vegetation adaptability
语种	中文
国家	中国
收录类别	CSCD
WOS类目	ECOLOGY
WOS研究方向	Environmental Sciences & Ecology
CSCD记录号	CSCD:2107945
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/206531
作者单位	1.成都理工大学地球科学学院, 成都, 四川 610059, 中国; 2.成都理工大学, 油汽藏及开发工程国家重点实验室, 成都, 四川 610059, 中国; 3.成都理工大学环境与土木工程学院, 成都, 四川 610059, 中国
推荐引用方式 GB/T 7714	王谋,李勇,黄润秋,等. 气候变暖对青藏高原腹地高寒植被的影响[J],2005,25(6):1275-1281.
APA	王谋,李勇,黄润秋,&李亚林.(2005).气候变暖对青藏高原腹地高寒植被的影响.生态学报,25(6),1275-1281.
MLA	王谋,et al."气候变暖对青藏高原腹地高寒植被的影响".生态学报 25.6(2005):1275-1281.