Effect of grazing exclusion on the temperature sensitivity of soil net nitrogen mineralization in the Inner Mongolian grasslands

doi:10.1016/j.ejsobi.2020.103171

	Effect of grazing exclusion on the temperature sensitivity of soil net nitrogen mineralization in the Inner Mongolian grasslands
	Liu, Yuan 1,2; Wang, Changhui 3; Xu, Li 1; He, Nianpeng 1,2,4
刊名	EUROPEAN JOURNAL OF SOIL BIOLOGY
	2020-03-01
卷号	97 页码:7
关键词	Grazing exclusion Soil net N mineralization Temperature sensitivity Activation energy CQT hypothesis
ISSN号	1164-5563
DOI	10.1016/j.ejsobi.2020.103171
通讯作者	Xu, Li(xuli@igsnrr.ac.cn)
英文摘要	Grazing exclusion (GE) is an efficient management practice that prevents grassland degradation. The temperature sensitivity (Q(10)) of soil net nitrogen (N) mineralization (N-min) is an important parameter of N cycles, and it directly influences the feedback between the primary productivity of grassland ecosystems and climate warming. However, information remains limited about how GE affects the Q(10) of N-min in N-limited grasslands. In this study, we conducted a laboratory incubation experiment at six temperatures (-10, 0, 5, 15, 25, and 35 degrees C) and three soil moisture contents (15%, 25%, and 35%) for 35 days by using intact soil cores from three different GE periods grassland (0, 4 and 24 years). The results showed that long-term GE decreased the Q(10) of Nmin, which was highest in GE0 (2.62), followed by GE4 (2.36) and GE24 (2.42). In addition, Q(10) declined in 15% soil moisture content under all three GE treatments. Furthermore, activation energy (E-a) was negatively correlated with the substrate quality index (Q) in all three GE grasslands. These results support the carbon quality-temperature (CQT) hypothesis, showing that is can be applied to soil N mineralization in grasslands after long-term GE. This study demonstrated that GE potentially reduces the sensitivity of N-min to increasing temperature under global warming scenarios, which might help prevent N losses in these N-limited grasslands.
资助项目	National Key Research and Development Program of China[2017YFC0503904] ; National Natural Science Foundation of China[31870437] ; National Natural Science Foundation of China[31872690] ; National Natural Science Foundation of China[41573063]
WOS关键词	ORGANIC-MATTER DECOMPOSITION ; CARBON MINERALIZATION ; ALTITUDINAL GRADIENT ; LITTER QUALITY ; ALPINE MEADOW ; LOESS PLATEAU ; STEPPE ; LAND ; PATTERNS ; STORAGE
WOS研究方向	Environmental Sciences & Ecology ; Agriculture
语种	英语
出版者	ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
WOS记录号	WOS:000528019700007
资助机构	National Key Research and Development Program of China ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/159830]
专题	中国科学院地理科学与资源研究所
通讯作者	Xu, Li
作者单位	1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 4.Northeast Normal Univ, Key Lab Vegetat Ecol, Minist Educ, Changchun 130024, Peoples R China
推荐引用方式 GB/T 7714	Liu, Yuan,Wang, Changhui,Xu, Li,et al. Effect of grazing exclusion on the temperature sensitivity of soil net nitrogen mineralization in the Inner Mongolian grasslands[J]. EUROPEAN JOURNAL OF SOIL BIOLOGY,2020,97:7.
APA	Liu, Yuan,Wang, Changhui,Xu, Li,&He, Nianpeng.(2020).Effect of grazing exclusion on the temperature sensitivity of soil net nitrogen mineralization in the Inner Mongolian grasslands.EUROPEAN JOURNAL OF SOIL BIOLOGY,97,7.
MLA	Liu, Yuan,et al."Effect of grazing exclusion on the temperature sensitivity of soil net nitrogen mineralization in the Inner Mongolian grasslands".EUROPEAN JOURNAL OF SOIL BIOLOGY 97(2020):7.