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Journal of Arid Land  2012, Vol. 4 Issue (3): 300-309    DOI: 10.3724/SP.J.1227.2012.00300
Research Articles     
Simulating the vegetation-producing process in small watersheds in the Loess Plateau of China
1 State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710075, China;
2 Northwest Agriculture and Forestry University, Yangling 712100, China
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Abstract  Small watersheds are the basic composition unit of the Loess Plateau in China. An accurate estimation of vegetation net primary productivity (NPP) is of great significance for eco-benefit evaluation in small watershed management in this region. Here we describe the development and testing of a vegetation-producing process model (VPP) of a small watershed in the Loess Plateau. The model couples three modules: radiation adjustment; soil hydrological processes; and vegetation carbon assimilation. Model validation indicates that the VPP model can be used to estimate the NPP of small watersheds in the region. With the VPP model, we estimated the spatial NPP distributions in the Yangou watershed for 2007. The results show that in the Yangou watershed the NPP is relatively low, averaging 168 g C/(m2•a). Trees and shrubs have a higher NPP than crops and grasses. The NPP is larger on the partly shaded and shaded slopes than on the partly sunny and sunny slopes. The NPP on the slopes increases gradually on 0–20° slopes and decreases slightly on slopes steeper than 20°. Our simulation indicates that the vegetation type is the most important factor in determining the NPP distribution in small watersheds in the Loess Plateau.

Key wordsdry season grazing      grass species composition      livestock grazing      soil nutrients      Kenya     
Received: 13 October 2011      Published: 03 September 2012

Strategic Priority Research Program (XDA05050403) and the Key Research Program of Chinese Academy of Sciences (KZZD-EW-04).

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Cite this article:

KaiBo WANG, ZhouPing SHANGGUAN. Simulating the vegetation-producing process in small watersheds in the Loess Plateau of China. Journal of Arid Land, 2012, 4(3): 300-309.

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