The patterns and mechanisms of precipitation use efficiency in alpine grasslands on the Tibetan Plateau

doi:10.1016/j.agee.2020.106833

	The patterns and mechanisms of precipitation use efficiency in alpine grasslands on the Tibetan Plateau
	Zhou, Tiancai 6,7,8; Liu, Miao 1,6; Sun, Jian 6; Li, Yurui 2; Shi, Peili 6; Tsunekawa, Atsushi 1; Zhou, Huakun 3; Yi, Shuhua 4; Xue, Xian 5
刊名	AGRICULTURE ECOSYSTEMS & ENVIRONMENT
	2020-04-15
卷号	292 页码:11
关键词	Precipitation use efficiency Aridity index Edaphic factors Dryland Alpine grassland Tibetan Plateau
ISSN号	0167-8809
DOI	10.1016/j.agee.2020.106833
通讯作者	Sun, Jian(sunjian@igsnrr.ac.cn)
英文摘要	Precipitation use efficiency (PUE), the ratio of aboveground net primary productivity (ANPP) to annual mean precipitation, is a key indicator for assessing the differential response of the water and C cycles to environmental change. Although the alpine grassland of the Tibetan Plateau (TP) is sensitive and vulnerable to climate change, a generalized pattern of PUE along the water and heat availability gradients is still unavailable. Here, a transect survey was conducted across grasslands on the TP to measure ANPP in the community and further explored the patterns of PUE along aridity index (AI) gradients with "Changepoint" analysis method. The results indicated that two patterns of PUE were detected, with significantly (P < 0.05) lower PUE (0.15 g m(-2) mm(-1)) in arid environments than that in semiarid and humid environments (0.30 g m(-2) mm(-1)). These PUE patterns were largely due to the differences in vegetative ANPP and coverage (COV). Specifically, the relatively low annual mean precipitation (210.90 mm) and soil nutrients limited the vegetative ANPP and COV in arid environments as a result of lower PUE. In contrast, the increased precipitation and soil nutrients induced significantly (P < 0.05) positive effects on ANPP and COV. Consequently, the PUE was significantly (P < 0.05) promoted by soil C, ANPP, and COV, with standard total effects of 0.19, 0.89 and 0.29 in the structural equation model, respectively. Notably, a negative relationship between AI and PUE was detected (AI > 55), this phenomenon was probably explained by plants via losing water resources to take up more soil nutrients in humid environments. Because the higher stomatal conductance of plant in humid environments leads to higher transpiration (water loss) and therefore can improve soil nutrient uptake. Our findings highlight that environmental factors regulate the variation in PUE through their effects on vegetative ANPP and COV.
资助项目	National Science Foundation of China[41871040] ; National Science Foundation of China[41501057] ; National Science Foundation of China[31870406] ; State Key Research Development Program of China[2016YFC0501802] ; State Key Research Development Program of China[2016YFC0501803] ; Qinghai Innovation Platform Construction Project[2017-ZJ-Y20]
WOS关键词	RAIN USE EFFICIENCY ; NITROGEN DEPOSITION ; COMMUNITY STRUCTURE ; PHOSPHORUS ; GRADIENT ; CARBON ; WATER ; ECOSYSTEMS ; LIMITATION ; DYNAMICS
WOS研究方向	Agriculture ; Environmental Sciences & Ecology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000514931700021
资助机构	National Science Foundation of China ; State Key Research Development Program of China ; Qinghai Innovation Platform Construction Project
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/133280]
专题	中国科学院地理科学与资源研究所
通讯作者	Sun, Jian
作者单位	1.Tottori Univ, Arid Land Res Ctr, Tottori 6800001, Japan 2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China 3.Chinese Acad Sci, Key Lab Restorat Ecol Cold Regions Qinghai, Northwest Inst Plateau Biol, Xining 810008, Peoples R China 4.Nantong Univ, Sch Geog Sci, Nantong 226007, Jiangsu, Peoples R China 5.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Desert & Desertificat, Lanzhou, Peoples R China 6.Chinese Acad Sci, Synth Res Ctr Chinese Ecosyst Res Network, Key Lab Ecosyst Network Observat & Modelling, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China 7.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100190, Peoples R China 8.Chinese Acad Sci, Key Lab Ecosyst Network Observat & Modeling, Inst Geog Sci & Nat Resources Res, Lhasa Plateau Ecosyst Res Stn, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Zhou, Tiancai,Liu, Miao,Sun, Jian,et al. The patterns and mechanisms of precipitation use efficiency in alpine grasslands on the Tibetan Plateau[J]. AGRICULTURE ECOSYSTEMS & ENVIRONMENT,2020,292:11.
APA	Zhou, Tiancai.,Liu, Miao.,Sun, Jian.,Li, Yurui.,Shi, Peili.,...&Xue, Xian.(2020).The patterns and mechanisms of precipitation use efficiency in alpine grasslands on the Tibetan Plateau.AGRICULTURE ECOSYSTEMS & ENVIRONMENT,292,11.
MLA	Zhou, Tiancai,et al."The patterns and mechanisms of precipitation use efficiency in alpine grasslands on the Tibetan Plateau".AGRICULTURE ECOSYSTEMS & ENVIRONMENT 292(2020):11.