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- Title
川西高山-亚高山草地群落特征及稳定性对增温的响应.
- Authors
宋扎磋; 王腊梅; 张莉; 陆徐伟; 陈程浩; 杨燕; 索南吉
- Abstract
As an important ecological barrier in the upper reaches of the Yangtze River and the Yellow River, the alpine-subalpine region in western Sichuan is rich in biodiversity. The alpine-subalpine grassland ecosystem in the region is sensitive to local warming changes under the circumstance of global warming, but there were insufficient studies on the response of grassland ecosystem communities and their stability to warming. This was quite possibly due to poor research methodologies, such as the improper application of single indicator in a model or small research scales extending to a large scale, inevitably making parts of research conclusions are neither comprehensive nor convincing. To better predict the responses of alpine-subalpine grassland ecosystem to incoming climate changes at different elevations, in this study four sample plots of natural alpine-subalpine grassland were selected from 3000 m to 4130 m in the Yajiageng valley, northeast slope of the Gongga Mountain, western Sichuan, China; two common warming methods of simulating, Open Top Chambers (OTCs) warming and transplanting warming were used to simulate ambient temperature rise. The responses of five indicators, including aboveground vegetation species richness, communality height, total coverage, and Aboveground Net Primary Productivity (ANPP) at each plot in the period of 2012-2017 were recorded and the relationship between the indicators and the temporal stability of community biomass was analyzed. It has the following findings: (1) OTCs warming reduced species richness only in the coldest plots at the highest altitude, but did not affected those in middle-low altitude, whereas transplanting warming increased species richness in the coldest plots at the highest altitude site, but it decreased species richness at plots in the middle-low altitude. (2) OTCs warming only increased vegetation height in the coldest plots at the highest altitude, whereas transplanting warming increased vegetation height at all plots significantly. (3) Two warming methods both deceased the forb coverage in two sample plots at middle altitude but they increased sedge and grass coverage. (4) Only transplanting warming significantly increased ANPP at the coldest sample plots with high altitude, and there were differences in ANPP at altitudes among each functional group. (5) At the 3850 m sample plot, the time stability of community biomass in the shrub-grass ecotone was the highest, while at 4130 m it was the weakest. This study suggested that the aboveground vegetation community structure and net primary productivity at high altitude were vulnerable to the climate warming and tend to unstable. This study can provide a scientific basis for ecological conservation management and policy making for alpine grassland ecosystem in westem Sichuan.
- Publication
Mountain Research (10082786), 2023, Vol 41, Issue 3, p348
- ISSN
1008-2786
- Publication type
Article
- DOI
10.16089/j.cnki.1008-2786.000753