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
ISSN2095-0195
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
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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.
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