东亚地区陆地生态系统净第一性生产力时空格局

The spatio-temproal pattern of net primary productivity of terrestrial ecosystem in East Asia region

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.