Grazing exclusion enhanced net ecosystem carbon uptake but decreased plant nutrient content in an alpine steppe

doi:10.1016/j.ijdrr.2019.101379

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > 山地表生过程与生态调控重点实验室

	Grazing exclusion enhanced net ecosystem carbon uptake but decreased plant nutrient content in an alpine steppe
	Liu, Yongwen 1,2; Tenzintarchen 3; Geng, Xiaodong 4; Wei, Da 5; Dai, Dongxue 6; Xu-Ri 1,2
刊名	CATENA
	2020
卷号	195 页码:101379
关键词	Climate change Livestock exclosure Carbon cycle Net ecosystem CO2 exchange Mineral element Nitrogen:phosphorus ratio Alpine grassland Rangeland degradation Tibetan Plateau
ISSN号	0341-8162
DOI	10.1016/j.ijdrr.2019.101379
通讯作者	Liu, Yongwen(liuyongwen@itpcas.ac.cn) ; Xu-Ri(xu-ri@itpcas.ac.cn)
产权排序	5
文献子类	Article
英文摘要	Grazing exclusion is widely conducted to restore degraded grasslands. The recovery status can be indicated by both nutrient and carbon cycling. However, the effect of grazing exclusion on net ecosystem CO2 exchange and mineral nutrients in pastures on the Tibetan Plateau remains unclear, due to a lack of in situ investigations. Here, we conducted an in situ investigation of the grazing exclusion effect on net ecosystem CO2 exchange and foliar mineral elements in an alpine steppe on the central Tibetan Plateau. Our results show that seven years of grazing exclusion enhanced net CO2 uptake by 17% during the growing season via increased gross ecosystem photosynthesis, rather than unchanged ecosystem respiration. Grazing exclusion reduced the sensitivity of ecosystem respiration to soil surface temperature by 16-17% at both diurnal and seasonal scales. Grazing exclusion, therefore, may be an effective way to enhance carbon sequestration under the background of a warming climate. We further found that grazing exclusion significantly decreased the soil available nitrate-nitrogen concentration by 50% and foliar mineral concentrations such as nitrogen, calcium, sulfur, iron, and manganese. Grazing exclusion increased the foliar carbon:nitrogen ratio by 16% and decreased the foliar nitrogen:phosphorus ratio by 15%. These results indicate that grazing exclusion enhanced net ecosystem CO2 uptake but aggravated mineral nutrient limitation of plant growth. Our study highlights that grazing exclusion influences alpine grassland carbon cycling by directly preventing grazing and by indirectly altering the status of plant nutrients. A quantitative distinction of such direct and indirect effects based on long-term and continuous in situ field observations is critical for revealing the mechanism underlying carbon-nutrient cycling evolution in the restoration of degraded alpine grasslands.
资助项目	Strategic Priority Research Program of Chinese Academy of Sciences[XDA20050102] ; National Natural Science Foundation of China[41701089] ; National Natural Science Foundation of China[41861134036] ; National Natural Science Foundation of China[41775161] ; Youth Innovation Promotion Association CAS[2019074]
WOS关键词	TIBETAN PLATEAU ; CO2 EXCHANGE ; NITROGEN MINERALIZATION ; TEMPERATURE SENSITIVITY ; SOIL-TEMPERATURE ; INNER-MONGOLIA ; CLIMATE-CHANGE ; GRASSLAND ; PRODUCTIVITY ; VEGETATION
WOS研究方向	Geology ; Agriculture ; Water Resources
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000546981000002
资助机构	Strategic Priority Research Program of Chinese Academy of Sciences ; National Natural Science Foundation of China ; Youth Innovation Promotion Association CAS
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/50729]
专题	成都山地灾害与环境研究所_山地表生过程与生态调控重点实验室
通讯作者	Liu, Yongwen; Xu-Ri
作者单位	1.Key Laboratory of Alpine Ecology, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China; 2.CAS Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing 100101, China; 3.Institute of Pratacultural Science, Tibet Academy of Agricultural and Animal Husbandry Sciences, Lhasa 850000, China; 4.School of Resources and Environment, Anqing Normal University, Anqing 246133, China; 5.Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China; 6.College of Biology and Food Science, Hebei Normal University for Nationalities, Chengde 067000, China
推荐引用方式 GB/T 7714	Liu, Yongwen,Tenzintarchen,Geng, Xiaodong,et al. Grazing exclusion enhanced net ecosystem carbon uptake but decreased plant nutrient content in an alpine steppe[J]. CATENA,2020,195:101379.
APA	Liu, Yongwen,Tenzintarchen,Geng, Xiaodong,Wei, Da,Dai, Dongxue,&Xu-Ri.(2020).Grazing exclusion enhanced net ecosystem carbon uptake but decreased plant nutrient content in an alpine steppe.CATENA,195,101379.
MLA	Liu, Yongwen,et al."Grazing exclusion enhanced net ecosystem carbon uptake but decreased plant nutrient content in an alpine steppe".CATENA 195(2020):101379.