Assessing spatio-temporal variations of precipitation-use efficiency over Tibetan grasslands using MODIS and in-situ observations
Liu, ZJ; Huang, M
2016
Source PublicationFRONTIERS OF EARTH SCIENCE
ISSN2095-0195
Volume10Issue:4Pages:784-793
AbstractClarifying 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.
SubtypeJournal
Keywordnormalized difference vegetation index (NDVI) Tibetan Plateau inter-annual variations alpine grasslands exponential model
Subject AreaGeology
WOS Subject ExtendedGeosciences, Multidisciplinary
WOS KeywordRAIN-USE EFFICIENCY ; LAND-COVER CHANGE ; PRIMARY PRODUCTIVITY ; UNITED-STATES ; CARBON ; CHINA ; PLATEAU ; CLIMATE ; BIOMASS ; TEMPERATURE
Indexed BySCI
Language英语
WOS IDWOS:000387866300016
PublisherSPRINGER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/44150
Collection生态系统网络观测与模拟院重点实验室_生态网络实验室
Recommended Citation
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.
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