Effects of grazing exclusion on soil carbon dynamics in alpine grasslands of the Tibetan Plateau

doi:10.1016/j.geoderma.2019.06.036

	Effects of grazing exclusion on soil carbon dynamics in alpine grasslands of the Tibetan Plateau
	Yu, Lingfei; Chen, Yue; Sun, Wenjuan; Huang, Yao
	2019
发表期刊	GEODERMA
ISSN	0016-7061
卷号	353 页码:133-143
摘要	Globally, excessive grazing is identified as one of the key disturbances leading to grassland degradation and soil carbon (C) loss. Grazing exclusion has been proposed as an effective practice to restore degraded grasslands and to promote C sequestration. However, there is still little knowledge about how soil C changes with grazing exclusion in high-altitude alpine ecosystems with very cold climates. We synthesized data from 63 sites in the literature and 15 sites in a field sampling and investigated the dynamics of soil C stocks following grazing exclusion in alpine grasslands of the Tibetan Plateau. The results showed that the soil C stock increased with grazing exclusion at most sites, with average C sequestration rates of 0.84, 0.58, and 0.49 Mg ha(-1) yr(-1) in the soil layers of 0-10, 10-20, and 20-30 cm, respectively. Based on these results, if 60 million ha of the grasslands on Tibetan Plateau were excluded from grazing livestock by 2020 according to the national plan, then approximately 0.11 Pg C yr(-1) would be sequestered in the soil which equates to about 4.4% of fossil fuel and cement CO2 emissions in China in 2013. Generally, the rates of soil C increase exhibited a declining pattern with increasing years of grazing exclusion, with a significant decrease occurring after ten years of grazing exclusion. Of the factors examined, the rates of absolute and relative soil C change were both positively related to mean annual precipitation but negatively related to the year of grazing exclusion and initial soil C stock, respectively. The rates of soil C changes increased linearly with those of N change, and no matter how soil C changed (whether it increased or decreased), soil C:N ratios remained stable over the years of grazing exclusion. Our results implied that grazing exclusion is beneficial for soil C sequestration in degraded alpine grassland, especially in humid areas. Moreover, the intrinsic increase in N could keep up with the pace of soil C changes and would sustain soil C sequestration during the recovery process.
关键词	Grassland Grazing exclusion Qinghai-Tibetan Plateau Restoration Soil C
学科领域	Soil Science
DOI	10.1016/j.geoderma.2019.06.036
收录类别	SCI
语种	英语
WOS关键词	ORGANIC-CARBON ; LAND-USE ; RANGELAND DEGRADATION ; NITROGEN STORAGE ; PLANT DIVERSITY ; SEQUESTRATION ; CHINA ; MANAGEMENT ; ACCUMULATION ; ECOSYSTEMS
WOS研究方向	Agriculture
WOS记录号	WOS:000482513900014
出版者	ELSEVIER
文献子类	Article
出版地	AMSTERDAM
EISSN	1872-6259
资助机构	National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [31670484] ; National Basic Research Program of ChinaNational Basic Research Program of China [2014CB954004]
作者邮箱	yulf@ibcas.ac.cn
引用统计	被引频次：56[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/19522
专题	植被与环境变化国家重点实验室
作者单位	Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China
推荐引用方式 GB/T 7714	Yu, Lingfei,Chen, Yue,Sun, Wenjuan,et al. Effects of grazing exclusion on soil carbon dynamics in alpine grasslands of the Tibetan Plateau[J]. GEODERMA,2019,353:133-143.
APA	Yu, Lingfei,Chen, Yue,Sun, Wenjuan,&Huang, Yao.(2019).Effects of grazing exclusion on soil carbon dynamics in alpine grasslands of the Tibetan Plateau.GEODERMA,353,133-143.
MLA	Yu, Lingfei,et al."Effects of grazing exclusion on soil carbon dynamics in alpine grasslands of the Tibetan Plateau".GEODERMA 353(2019):133-143.

条目包含的文件
文件名称/大小	文献类型	版本类型	开放类型	使用许可
Applet_2021-12-13_16（2140KB）	期刊论文	出版稿	开放获取	CC BY-NC-SA	浏览请求全文