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草业学报 ›› 2010, Vol. 19 ›› Issue (1): 201-210.

• 研究论文 • 上一篇    下一篇

基于MODIS植被指数的甘南草地净初级生产力时空变化研究

王莺1,夏文韬1,梁天刚1*,王超2   

  1. 1.兰州大学草地农业科技学院 农业部草地农业生态系统学重点实验室,甘肃 兰州 730020;

    2.兰州大学西部环境教育部重点实验室,甘肃 兰州 730000
  • 收稿日期:2009-01-15 出版日期:2010-01-25 发布日期:2010-02-20
  • 作者简介:王莺(1984-),女,甘肃兰州人,在读硕士。E-mail:wangyn2007@lzu.cn
  • 基金资助:
    国家高技术研究发展专项经费(2007AA10Z232)资助

Spatial and temporal dynamic changes of net primary product basedon MODIS vegetation index in Gannan grassland

WANG Ying1, XIA Wen-tao1, LIANG Tian-gang1, WANG Chao2   

  1. 1.Key Laboratory of Grassland Agro-ecology System, Ministry of Agriculture;
    College of Pastoral
    Agriculture Science and Technology, Lanzhou University, Lanzhou 730020, China;

    2. National Laboratory of Western China’s Environmental System, Lanzhou
    University, Lanzhou 730000, China
  • Received:2009-01-15 Online:2010-01-25 Published:2010-02-20

摘要: 利用甘南地区2006-2007年的外业实测样方草地干物质产量和MODIS植被指数数据,建立了草地地上部分干物质产量遥感反演模型,根据根冠比和干物质转碳率对2006-2008年甘南地区草地净初级生产力(NPP,net primary productivity)进行了估算,绘制了甘南草地NPP年累积量空间分布格局图和NPP月度变化动态图,对不同草地植被类型的NPP差异进行了评价。研究结果表明,2006-2008年甘南草地年NPP分别达637.04,599.98和566.59 g C/m2,其空间分布具有自西南向东北逐渐减少的趋势;年内不同草地类型的NPP均在7-8月达到最大累积量;NPP累积量最高的3种草地类型是沼泽、高寒灌丛草甸和高寒草甸,3年中最大月NPP的平均值分别达到1 137.28,553.76和527.66 g C/m2;2006-2008年甘南草地NPP持续下降,年草地NPP总量的减少速率为1.2 Tg/a,尤其是沼泽湿地的NPP下降明显,年平均减少速率达到了125.92 g C/m2

Abstract: Dry matter yield information from field surveying quadrats and MODIS vegetation index data in Gannan Prefecture during 2006-2007 were used to construct a remote sensing monitoring model for aboveground dry matter biomass of grassland. The net primary product (NPP) of grassland was estimated and used to, complete the spatial distribution maps of annual NPP accumulation and monthly NPP dynamic changes, and to evaluate the NPP difference between various grassland vegetation types. The annual maximum NPP of grassland in Gannan Prefecture during 2006-2008 were 637.04, 599.98 and 566.59 g C/(m2·a), respectively. The distribution of annual maximum NPP has a trend of gradual reduction from southwest to northeast and the yearly maximum NPP accumulation of all grassland types was in July and August. The three grassland types with the highest NPP accumulation were marsh, alpine shrub meadow, and alpine meadow, with monthly maximum NPP values of 1 137.28, 553.76 and 527.66 g C/m2, respectively (mean values for the three years). The grassland NPP in Gannan Prefecture was continuously decreasing over the three years, with an annual reduction forthe total grassland of 1.2 Tg/a. The reduction of marsh NPP is especially significant, with an annual rate of 125.92 g C/(m2·a).

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