Assessing spatio-temporal variations of precipitation-use efficiency over Tibetan grasslands using MODIS and in-situ observations

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	Assessing spatio-temporal variations of precipitation-use efficiency over Tibetan grasslands using MODIS and in-situ observations
	Liu, ZJ; Huang, M
	2016
发表期刊	FRONTIERS OF EARTH SCIENCE
ISSN	2095-0195
卷号	10 期号:4 页码:784-793
摘要	Clarifying the spatial and temporal variations in precipitation-use efficiency (PUE) is helpful for advancing our knowledge of carbon and water cycles in Tibetan grassland ecosystems. Here we use an integrated remote sensing normalized difference vegetation index (NDVI) and in-situ above-ground net primary production (ANPP) measurements to establish an empirical exponential model to estimate spatial ANPP across the entire Tibetan Plateau. The spatial and temporal variations in PUE (the ratio of ANPP to mean annual precipitation (MAP)), as well as the relationships between PUE and other controls, were then investigated during the 2001-2012 study period. At a regional scale, PUE increased from west to east. PUE anomalies increased significantly (> 0.1 g center dot m(-2)center dot mm(-1)/10 yr) in the southern areas of the Tibetan Plateau yet decreased (> 0.02 g center dot m(-2)center dot mm(-1)/10 yr) in the northeastern areas. For alpine meadow, we obtained an obvious breaking point in trend of PUE against elevation gradients at 3600 m above the sea level, which showed a contrasting relationship. At the inter-annual scale, PUE anomalies were smaller in alpine steppe than in alpine meadow. The results show that PUE of Tibetan grasslands is generally high in dry years and low in wet years.
文章类型	Journal
关键词	normalized difference vegetation index (NDVI) Tibetan Plateau inter-annual variations alpine grasslands exponential model
学科领域	Geology
研究领域[WOS]	Geosciences, Multidisciplinary
关键词[WOS]	RAIN-USE EFFICIENCY ; LAND-COVER CHANGE ; PRIMARY PRODUCTIVITY ; UNITED-STATES ; CARBON ; CHINA ; PLATEAU ; CLIMATE ; BIOMASS ; TEMPERATURE
收录类别	SCI
语种	英语
WOS记录号	WOS:000387866300016
出版者	SPRINGER
引用统计
文献类型	期刊论文
条目标识符	http://ir.igsnrr.ac.cn/handle/311030/44150
专题	生态系统网络观测与模拟院重点实验室_生态网络实验室
推荐引用方式 GB/T 7714	Liu, ZJ,Huang, M. Assessing spatio-temporal variations of precipitation-use efficiency over Tibetan grasslands using MODIS and in-situ observations[J]. FRONTIERS OF EARTH SCIENCE,2016,10(4):784-793.
APA	Liu, ZJ,&Huang, M.(2016).Assessing spatio-temporal variations of precipitation-use efficiency over Tibetan grasslands using MODIS and in-situ observations.FRONTIERS OF EARTH SCIENCE,10(4),784-793.
MLA	Liu, ZJ,et al."Assessing spatio-temporal variations of precipitation-use efficiency over Tibetan grasslands using MODIS and in-situ observations".FRONTIERS OF EARTH SCIENCE 10.4(2016):784-793.