气候变化领域集成服务门户(CCPortal): Greenhouse gas balance in global pasturelands and rangelands

CCPortal

DOI	10.1088/1748-9326/abaa79
	Greenhouse gas balance in global pasturelands and rangelands
	Dangal S.R.S.; Tian H.; Pan S.; Zhang L.; Xu R.
发表日期	2020
ISSN	17489318
卷号	15 期号:10
英文摘要	Grassland ecosystems play an essential role in climate regulation through carbon (C) storage in plant and soil. But, anthropogenic practices such as livestock grazing, grazing related excreta nitrogen (N) deposition, and manure/fertilizer N application have the potential to reduce the effectiveness of grassland C sink through increased nitrous oxide (N2O) and methane (CH4) emissions. Although the effect of anthropogenic activities on net greenhouse gas (GHG) fluxes in grassland ecosystems have been investigated at local to regional scales, estimates of net GHG balance at the global scale remains uncertain. With the data-model framework integrating empirical estimates of livestock CH4 emissions with process-based modeling estimates of land CO2, N2O and CH4 fluxes, we examined the overall global warming potential (GWP) of grassland ecosystems during 1961-2010. We then quantified the grassland-specific and regional variations to identify hotspots of GHG fluxes. Our results show that, over a 100-year time horizon, grassland ecosystems sequestered a cumulative total of 113.9 Pg CO2-eq in plant and soil, but then released 91.9 Pg CO2-eq to the atmosphere, offsetting 81% of the net CO2 sink. We also found large grassland-specific variations in net GHG fluxes, with pasturelands acting as a small GHG source of 1.52 143 Tg CO2-eq yr-1 (mean 1.0 s.d.) and rangelands a strong GHG sink (-442 266 Tg CO2-eq yr-1) during 1961-2010. Regionally, Europe acted as a GHG source of 23 10 Tg CO2-eq yr-1, while other regions (i.e. Africa, Southern Asia) were strong GHG sinks during 2001-2010. Our study highlights the importance of considering regional and grassland-specific differences in GHG fluxes for guiding future management and climate mitigation strategies in global grasslands. © 2020 The Author(s). Published by IOP Publishing Ltd.
英文关键词	climate change; grassland management; grazing; greenhouse gases
语种	英语
scopus关键词	Agriculture; Carbon dioxide; Digital storage; Ecosystems; Fertilizers; Global warming; Greenhouse effect; Nitrogen oxides; Anthropogenic activity; Climate mitigations; Empirical estimate; Global warming potential; Grassland ecosystems; Greenhouse gas (GHG); Greenhouse gas balance; Process-based modeling; Greenhouse gases; fertilizer application; global warming; grassland; greenhouse gas; methane; nitrous oxide; pasture; rangeland; Africa; South Asia
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153680
作者单位	International Center for Climate and Global Change Research, Auburn University, Auburn, AL, United States; Woods Hole Research Center, Falmouth, MA, United States; Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China
推荐引用方式 GB/T 7714	Dangal S.R.S.,Tian H.,Pan S.,et al. Greenhouse gas balance in global pasturelands and rangelands[J],2020,15(10).
APA	Dangal S.R.S.,Tian H.,Pan S.,Zhang L.,&Xu R..(2020).Greenhouse gas balance in global pasturelands and rangelands.Environmental Research Letters,15(10).
MLA	Dangal S.R.S.,et al."Greenhouse gas balance in global pasturelands and rangelands".Environmental Research Letters 15.10(2020).