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Frontiers of Earth Science

ISSN 2095-0195

ISSN 2095-0209(Online)

CN 11-5982/P

Postal Subscription Code 80-963

2018 Impact Factor: 1.205

Front. Earth Sci.    2016, Vol. 10 Issue (4) : 784-793    https://doi.org/10.1007/s11707-016-0566-3
RESEARCH ARTICLE
Assessing spatio-temporal variations of precipitation-use efficiency over Tibetan grasslands using MODIS and in-situ observations
Zhengjia LIU1,2,Mei HUANG1()
1. Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
2. State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100101, China
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Abstract

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·m–2·mm–1/10 yr) in the southern areas of the Tibetan Plateau yet decreased (>0.02 g·m–2·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.

Keywords normalized difference vegetation index (NDVI)      Tibetan Plateau      inter-annual variations      alpine grasslands      exponential model     
Corresponding Author(s): Mei HUANG   
Online First Date: 31 March 2016    Issue Date: 04 November 2016
 Cite this article:   
Zhengjia LIU,Mei HUANG. Assessing spatio-temporal variations of precipitation-use efficiency over Tibetan grasslands using MODIS and in-situ observations[J]. Front. Earth Sci., 2016, 10(4): 784-793.
 URL:  
https://academic.hep.com.cn/fesci/EN/10.1007/s11707-016-0566-3
https://academic.hep.com.cn/fesci/EN/Y2016/V10/I4/784
Fig.1  Study area, locations of sampling sites and weather stations on the Tibetan Plateau. The base map is the 1:1,000,000 vegetation map of the Tibetan Plateau.
Fig.2  Relationship between above-ground net primary production (ANPP) and Normalized Difference Vegetation Index (NDVI). The ANPP measured at sampling sites was used for developing the empirical function between measured ANPP and growing season NDVI to estimate ANPP at the regional scale.
Grassland type ANPP/(g·m–2) PUE/(g·m–2·mm–1)
Min Max Mean SD Min Max Mean SD
Alpine meadow 20.4 215.5 95.5 34.2 0.03 0.85 0.20 0.07
Alpine steppe 18.7 211.5 40.8 16.9 0.03 0.87 0.13 0.04
Total 18.7 215.5 61.0 36.2 0.03 0.87 0.16 0.06
Tab.1  Statistical results of spatially averaged above-ground net primary production (ANPP) and precipitation-use efficiency (PUE) in alpine grasslands on the Tibetan Plateau during the period of 2001–2012
Fig.3  (a) Spatial distribution of mean precipitation-use efficiency (PUE), (b) slope of inter-annual PUE, (c) and confidence level (t-test) in alpine grasslands on the Tibetan Plateau during the period 2001–2012.
Fig.4  Changes in precipitation-use efficiency (PUE) for alpine meadow (AM in pink color) and alpine steppe (AS in blue color) on the Tibetan Plateau with elevation. Error bars represent one standard deviation (SD) of pixels in each elevation interval with a sample size of>30,000 pixels. The black solid lines are trend lines.
Fig.5  Inter-annual variations in precipitation-use efficiency (PUE) anomalies (2001–2012) for alpine meadow (AM) and alpine steppe (AS).
Fig.6  Inter-annual variations in precipitation-use efficiency (PUE) and the mean annual precipitation (MAP) in alpine meadow (AM, pink) and alpine steppe (AS, blue) during the period of 2001–2012.
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