气候变化领域集成服务门户(CCPortal): Chronic drought decreased organic carbon content in topsoil greater than intense drought across grasslands in Northern China

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DOI	10.1016/j.geoderma.2024.116832
	Chronic drought decreased organic carbon content in topsoil greater than intense drought across grasslands in Northern China
	Jaman, Md. Shahariar; Yu, Qiang; Xu, Chong; Jamil, Mahbuba; Ke, Yuguang; Yang, Tian; Knapp, Alan K.; Wilkins, Kate; Collins, Scott L.; Griffin-Nolan, RobertJ.; Luo, Yiqi; Luo, Wentao; Wu, Honghui
发表日期	2024
ISSN	0016-7061
EISSN	1872-6259
起始页码	443
卷号	443
英文摘要	Grasslands are expected to experience extreme climatic events such as extreme drought due to rising global temperatures. However, we still lack evidence of how extreme drought influence soil organic carbon (SOC) content in grassland ecosystems. We experimentally imposed extreme drought in two ways - chronic drought (66 % reduction in precipitation from May to August) and intense drought (100 % reduction in precipitation from June to July) to measure the effects of these two drought types on (SOC) content across six grassland sites that spanning desert steppe, typical steppe and meadow steppe in northern China. The experiment followed a randomized complete block design with six replicates of each treatment at each site. Our results showed that both chronic and intense drought decreased SOC content in the topsoil (0-10 cm) and the loss was higher in arid grasslands (desert steppe and typical steppe). Chronic drought decreased SOC content more than intense drought, with the effect again being strongest in arid grasslands. Furthermore, the response of SOC content to extreme drought was linked with the response of net primary productivity. Specifically, the response of SOC content was negatively correlated with drought sensitivity of above -ground net primary productivity (ANPP) but positively correlated with drought sensitivity of belowground NPP (BNPP). Overall, our results suggest that shifts in grassland SOC content with future drought will depend on the types of drought as well as the productivity responses and local climatic conditions such as precipitation, temperature, and aridity. The differential extreme drought impacts described here may facilitate predictions of climate change impacts on ecosystem carbon cycling.
英文关键词	Climate change; Carbon cycling; Extreme drought; Grassland ecosystem; Primary productivity
语种	英语
WOS研究方向	Agriculture
WOS类目	Soil Science
WOS记录号	WOS:001195943500001
来源期刊	GEODERMA
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/289213
作者单位	Chinese Academy of Agricultural Sciences; Institute of Agricultural Resources & Regional Planning, CAAS; Sher-e-Bangla Agricultural University (SAU); Beijing Forestry University; Colorado State University; University of New Mexico; California State University System; California State University Chico; Northern Arizona University; Chinese Academy of Sciences; Shenyang Institute of Applied Ecology, CAS; Chinese Academy of Agricultural Sciences; Institute of Agricultural Resources & Regional Planning, CAAS; Ministry of Agriculture & Rural Affairs; Chinese Academy of Agricultural Sciences; Institute of Agricultural Resources & Regional Planning, CAAS; Ministry of Agriculture & Rural Affairs
推荐引用方式 GB/T 7714	Jaman, Md. Shahariar,Yu, Qiang,Xu, Chong,et al. Chronic drought decreased organic carbon content in topsoil greater than intense drought across grasslands in Northern China[J],2024,443.
APA	Jaman, Md. Shahariar.,Yu, Qiang.,Xu, Chong.,Jamil, Mahbuba.,Ke, Yuguang.,...&Wu, Honghui.(2024).Chronic drought decreased organic carbon content in topsoil greater than intense drought across grasslands in Northern China.GEODERMA,443.
MLA	Jaman, Md. Shahariar,et al."Chronic drought decreased organic carbon content in topsoil greater than intense drought across grasslands in Northern China".GEODERMA 443(2024).