利用MODIS数据估测毛竹林总初级生产力

Gross primary production in Phyllostachys edulis based on MODIS

通过集成中分辨率成像光谱仪(MODIS)卫星影像数据与地面通量台站的观测数据,基于遥感的植被光合模型(VPM),估测了浙江省安吉县山川乡2011年的毛竹Phyllostachys edulis林总初级生产力(PGP)。研究表明:VPM模型估测的PGP(PGPVPM)在季节变化趋势上和通量站点数据获得的PGP(PGPobs)保持一致,VPM模型估算的2011年毛竹林总初级生产力为1 848.54 g·m-2,通量塔数据获得的2011年毛竹林总初级生产力为1 899.69 g·m-2,相对误差为2.69%。在全年累积总量上接近,但是估测值和观测值之间仍然存在一定的差异,尤其是在生长季节,PGPVPM的值要高于PGPobs;VPM模型估测的PGP和通量塔数据获取的PGP之间的决定系数为0.747,相关系数为0.864;且时间序列的增强植被指数(IEV)比PGP的相关关系强于归一化植被指数(INDV)与PGP的关系。研究表明:VPM对于站点和区域尺度的毛竹林生态系统PGP的模拟具有很大的潜力。

To analyze gross primary production （PGP） of Phyllostachys edulis from Shanchuan Village in Anji County, Zhejiang Province in 2011, the vegetation photosynthesis model （VPM） which was developed by in- tegrating MODIS （Moderate-resolution Imaging Spectroradiometer）and flux measurements was used. Results showed that PGPVPM（ 1 848.54 g. m-2）was consistent with results from Shanehuan carbon flux site（ 1 899.69 g. m-2） having a relative tolerance of 2.69%. Though total PGP was similar, some differences occurred especially in the growing season, PGPVPM were higher than PGPo^- The correlation of PGPVPM to PGPbbs was 0.747 and the correlation coefficient was 0.864. Further, time-series data for the IEV have a stronger linear relationship with the PGP than those for the Normalized Difference Vegetation Index. Results of this study demonstrate that the satellite-driven VPM has been potential for estimating site-level or regional Phyllostachys edulis PeP.