Driving Factors That Reduce Soil Carbon, Sugar, and Microbial Biomass in Degraded Alpine Grasslands

NWIPB OpenIR

	Driving Factors That Reduce Soil Carbon, Sugar, and Microbial Biomass in Degraded Alpine Grasslands
	Zhang, Rui; Bai, Yanfu; Zhang, Tao; Henkin, Zalmen; Degen, A. Allan; Jia, Tianhua; Guo, Cancan; Long, Ruijun; Shang, Zhanhuan
	2019
发表期刊	RANGELAND ECOLOGY & MANAGEMENT
卷号	72 期号:2
摘要	Soil carbon and sugars play key roles in carbon (C) cycling in grassland ecosystems. However, little is known about their changes in quantity and composition in degraded alpine meadows in the Tibetan plateau. We compared vegetation C density, soil organic carbon (SOC) density, and soil sugars in nondegraded (ND), degraded (DA; following artificial restoration), and extremely degraded (ED) grasslands and analyzed the relation among these parameters by redundancy analysis (RDA) and structural equation models (SEMs). Belowground biomass, soil microbial biomass C, soil microbial biomass nitrogen (N), belowground biomass C density, SOC density, and soil sugars were lower in DA and ED grasslands than in ND grasslands. In addition, the ratio of belowground biomass to aboveground biomass (BAR) decreased with an increase in degradation. The ratio of belowground biomass to aboveground biomass was identified as the main indirect driving force of ecosystem C density by affecting total vegetation C and SOC densities. Soil dissolved organic carbon (DOC), microbial biomass carbon (SMBC), neutral sugars (NS), and total nitrogen (TN) were identified as main direct driving forces. The ratio of belowground biomass to aboveground biomass altered DOC. SMBC, NS, and TN and, consequently, was the primary driving force for the alpine meadows' ecosystem C density. It was concluded that land management in alpine meadows should include practices that maintain a relatively high BAR in order to curb degradation and increase ecosystem C density. (C) 2018 The Society for Range Management. Published by Elsevier Inc. All rights reserved.
关键词	carbon degraded grassland soil sugars structure equation model Tibetan plateau
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/59861
专题	中国科学院西北高原生物研究所
推荐引用方式 GB/T 7714	Zhang, Rui,Bai, Yanfu,Zhang, Tao,et al. Driving Factors That Reduce Soil Carbon, Sugar, and Microbial Biomass in Degraded Alpine Grasslands[J]. RANGELAND ECOLOGY & MANAGEMENT,2019,72(2).
APA	Zhang, Rui.,Bai, Yanfu.,Zhang, Tao.,Henkin, Zalmen.,Degen, A. Allan.,...&Shang, Zhanhuan.(2019).Driving Factors That Reduce Soil Carbon, Sugar, and Microbial Biomass in Degraded Alpine Grasslands.RANGELAND ECOLOGY & MANAGEMENT,72(2).
MLA	Zhang, Rui,et al."Driving Factors That Reduce Soil Carbon, Sugar, and Microbial Biomass in Degraded Alpine Grasslands".RANGELAND ECOLOGY & MANAGEMENT 72.2(2019).