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机构地区:[1]山西大学资源与环境发展研究中心,山西太原030006 [2]山西大学黄土高原研究所 [3]中国农业科学院农业部植物营养与养分循环重点实验室,北京100081
出 处:《生态学报》2008年第9期4173-4183,共11页Acta Ecologica Sinica
基 金:国家973资助项目(No.2007CB109305)~~
摘 要:利用植被分类数据、NDVI数据、气象数据以及观测数据,基于CASA生态系统模型,估算了东亚地区(10~70°N,70~170°E)陆地生态系统植被净第一性生产力。结果表明:1982~1999年研究区总NPP呈现波动增加趋势,平均每年增加0.08833PgC。18a间NPP平均值为14.24 PgC,约占全球总NPP的22.6%~23.9%。研究区NPP年变化呈单峰曲线,最大值出现在7月份,达2.98PgC,全年中NPP积累主要发生在4~10月份,该时段内NPP总量占全年总量的86.81%。春、夏、秋、冬四季NPP平均总量分别为:2.31、8.16、2.79、1.10 PgC,分别占全年NPP平均总量的16.20%、57.27%、19.58%、7.73%。将NPP年平均值分成3个范围:低值区(7.82~300gC·m^-2)、中值区(301~700 gC·m^-2)、高值区(〉700gC·m^-2),分别研究了其空间分布特征。By using vegetation type map, NDVI (normalized difference vegetation index) data sets, meteorological data and observed NPP data, the paper droved CASA (Carnegie-Ames-Stanford Approach) ecosystem model to estimate net primary productivity for terrestrial ecosystem in East Asia region ( 10 --70°N,70 -- 170°E). The results indicated that NPP tends to increase during 1982 -- 1999, with an average increase of 0. 08833PGC per year. The mean total NPP during 1982 -- 199 is 14.24 PgC, making up 22.6% -23.9% of global NPP. Annual NPP change takes on a single peak curve. NPP reaches the peak value (2.98PGC) on August. 96.81% of the total NPP accumulates during the period of April to October in a year. On the average, spring, summer, autumn and winter NPP in the study area are 2.31 PgC ,8.16 PgC ,2.79 PgC and 1.10 PgC, comprising 16.20% ,57.27% , 19.58% and 7.73% of the total annual NPP, respectively. This paper divided NPP value of the study area into the low value zone (7.82 --300gC·m^-2), middle value zone (301 --700gC·m^-2) and high value zone ( 〉 700gC·m^-2) and studied their spatial distribution characters.
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