| 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.
|
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