Relationships between aboveground biomass and plant cover at two spatial scales and their determinants in northern Tibetan grasslands

CORC > 地理科学与资源研究所 > 中国科学院地理科学与资源研究所 > 生态系统研究网络观测与模拟重点实验室 > 生态网络实验室

	Relationships between aboveground biomass and plant cover at two spatial scales and their determinants in northern Tibetan grasslands
	Jiang, YB; Zhang, YJ; Wu, YP; Hu, RG; Zhu, JT; Tao, J; Zhang, T
刊名	ECOLOGY AND EVOLUTION
	2017
卷号	7 期号:19 页码:7954-7964
关键词	aboveground biomass grassland plant cover precipitation soil nitrogen content species composition species richness Tibet
ISSN号	2045-7758
英文摘要	The relationships between cover and AGB for the dominant and widely distributed alpine grasslands on the northern Tibetan Plateau is still not fully examined. The objectives of this study are to answer the following question: (1) How does aboveground biomass (AGB) of alpine grassland relate to plant cover at different spatial scales? (2) What are the major biotic and abiotic factors influencing on AGB-cover relationship? A community survey (species, cover, height, and abundance) was conducted within 1 m x 1 m plots in 70 sites along a precipitation gradient of 50-600 m. Ordinary linear regression was employed to examine AGB-cover relationships of both community and species levels at regional scale of entire grassland and landscape scale of alpine meadow, alpine steppe, and desert steppe. Hierarchical partitioning was employed to estimate independent contributions of biotic and abiotic factors to AGB and cover at both scales. Partial correlation analyses were used to discriminate the effects of biotic and abiotic factors on AGB-cover relationships at two spatial scales. AGB and community cover both exponentially increased along the precipitation gradient. At community level, AGB was positively and linearly correlated with cover for all grasslands except for alpine meadow. AGB was also linearly correlated with cover of species level at both regional and landscape scales. Contributions of biotic and abiotic factors to the relationship between AGB and cover significantly depended on spatial scales. Cover of cushions, forbs, legumes and sedges, species richness, MAP, and soil bulk density were important factors that influenced the AGB-cover relationship at either regional or landscape scale. This study indicated generally positive and linear relationships between AGB and cover are at both regional and landscape scales. Spatial scale may affect ranges of cover and modify the contribution of cover to AGB. AGB-cover relationships were influenced mainly by species composition of different functional groups. Therefore, in deriving AGB patterns at different spatial scales, community composition should be considered to obtain acceptable accuracy.
学科主题	Environmental Sciences & Ecology ; Evolutionary Biology
语种	英语
出版者	WILEY
WOS记录号	WOS:000412523700033
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/43998]
专题	生态系统网络观测与模拟院重点实验室_生态网络实验室
推荐引用方式 GB/T 7714	Jiang, YB,Zhang, YJ,Wu, YP,et al. Relationships between aboveground biomass and plant cover at two spatial scales and their determinants in northern Tibetan grasslands[J]. ECOLOGY AND EVOLUTION,2017,7(19):7954-7964.
APA	Jiang, YB.,Zhang, YJ.,Wu, YP.,Hu, RG.,Zhu, JT.,...&Zhang, T.(2017).Relationships between aboveground biomass and plant cover at two spatial scales and their determinants in northern Tibetan grasslands.ECOLOGY AND EVOLUTION,7(19),7954-7964.
MLA	Jiang, YB,et al."Relationships between aboveground biomass and plant cover at two spatial scales and their determinants in northern Tibetan grasslands".ECOLOGY AND EVOLUTION 7.19(2017):7954-7964.