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Acta Prataculturae Sinica ›› 2011, Vol. 20 ›› Issue (6): 18-25.

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Spatial-temporal distribution of the ecological service value and NPP of cultivated land on Longdong Loess Plateau

LI Guang1,2, HUANG Gao-bao3, WANG Qi4,5, WANG Xing-tang2, GAO Zhen-ni2, LIU Cheng-zhong2   

  1. 1.Gansu Provincial Key laboratory of Aridland Crop Science, Gansu Agricultural University, Lanzhou 730070, China;
    2.College of Information Science and Technology, Gansu Agricultural University, Lanzhou 730070, China;
    3.College of Agronomy, Gansu Agricultural University, Lanzhou 730070, China;
    4.College of Grassland Science, Gansu Agricultural University, Lanzhou 730070, China;
    5.Cryosphere Research Station on Qinghai-Xizang Plateau, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
  • Received:2010-06-29 Online:2011-06-25 Published:2011-12-20

Abstract: The heterogeneity in spatial-temporal scale of the net primary productivity (NPP) and ecological service value was studied to keep a healthy ecological system of cultivated land by using methods related to the ecological system service and productivity assessment. The changes in NPP and the unit area value of ecological service were not distinct with the total increasing from 1997-2005. The spatial distribution of NPP and ecological service value was very obvious and divided into the lower value in the northwest area and the higher value in the southeast area. The unit area value of ecological service was about 10.2×104 yuan/(ha·a) and NPP was about 5.04 t/(ha·a) in the southeast area, while in the northwest area, they were 7.7×104 yuan/(ha·a) and 3.54 t/(ha·a) respectively. The NPP and ecological service value would be improved by using precipitation resources with rational and high efficiency under the conditions of optimal crop layout and adjusted plant structure.

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