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JOURNAL OF NATURAL RESOURCES >

2008 , Vol. 23 >Issue 2: 263 - 273

DOI: https://doi.org/10.11849/zrzyxb.2008.02.011

Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS

Estimation of Heihe Basin Net Primary Productivity Using the CASA Model

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  • 1. Department of Earth Science, Zhejiang University, Hangzhou 310027, China;
    2. Department of Urban Planning & Management, Renmin University of China, Beijing 100872, China;
    3. Laboratory of Remote Sensing and GIS Science, Cold and Arid Regions Environment and Engineering Research Institute, CAS, Lanzhou 730000, China;
    4. Division of Hydrology and Water-land Resources, Cold and Arid Regions Enuironment and Engineering Researoh Institute, CAS, Lanzhou 730000, China

Received date: 2007-05-15

  Revised date: 2007-12-12

  Online published: 2008-03-25

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Abstract

The terrestrial ecosystem is the supporting system for the biosphere as well as for human being’s survival and development. The research of net primary productivity will help in understanding the amount of carbon fixed by terrestrial vegetation and its influencing factors. The purpose of this paper was to find out the NPP spatial and temporal dynamic distribution in the Heihe Basin during 1998 to 2002, and analyze vegetation’s feedback on climatic conditions. The CASA (Carnegie Ames Stanford Approach) was selected to calculate NPP. The SPOT/VEGETATION, land use/land cover, meteorologic data and soil attribute were collected. The results validate the CASA’s applicability in inland watershed scale. The 5 years NPP variation in the Heihe Basin was monitored by the model. The upper, middle and lower reaches of the Heihe Basin contributed ~50％,~30％ and ~20％ to the total NPP of the basin respectively. From 1998 to 2000 the NPP decreased and then increased from 2000 to 2002. The NPP in the upper reaches of the basin was mainly controlled by heat because the vegetation seldom faced the problem of moisture shortage, and the NPP increased when temperature increased. The NPP in the middle reaches of the basin also had good relationship with heat. The reason was that the cropland plants could get adequate water supply when necessary because there were many reservoirs set up for irrigation system and factories. The NPP variation in the lower reaches of the basin was larger than upper and middle, and had weak relationship with meteorologic factors. The vegetation endured drought throughout the year and high temperature in summer. It seldom obtained water supply, even from the oasis along the river because of water interception by the middle reaches reservoirs. Desert plants mainly lived on groundwater to survive in case of drought.

Key words： CASA; vegetation; carbon cycling; NPP; Heihe Basin

Cite this article

CHEN Zheng-hua, MA Qing-yuan, WANG Jian, QI Yuan, LI Jing, HUANG Chun-lin, MA Ming-guo, YANG Guo-jing . Estimation of Heihe Basin Net Primary Productivity Using the CASA Model[J]. JOURNAL OF NATURAL RESOURCES, 2008 , 23(2) : 263 -273 . DOI: 10.11849/zrzyxb.2008.02.011

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