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利用1999年5月至2000年4月期间接收的NOAA AVHRR图像进行了植被指数NDVI分布图的计算;讨论了其对全年NPP分布规律的贡献,并据此分区计算出相应的NPP分布图;又进一步将其与中国中原地区、华南地区森林、农田NPP野外实测样点数据相结合,建立了遥感NPP分布估算的定量模型;在此基础上,将NPP与DEM进行了配适分析,得到了中国东部南北样带的森林、农田三度或三向分布规律性直观的、定量的和详细的时空分析结果.作者认为,以往对中国NPP分布的研究由于受到图像分辨率较低(8 km)或定性分布规律分析的影响,所得出的结论与实况有比较大的出入.而通过中国东部南北样带分析所得出的结论是“山地森林植被与平原区农业植被NPP值的高低在不同区域存在较大差异,在华南地区前者高于后者;黄淮海平原农业区比其周边低山带NPP值高;而东北区NPP值由高至低的排列顺序为中高山森林带、平原和低山带”.而且,大多数农业区NPP值在25-35t·hm-2·a-1地带性差异不明显等结论.总之,遥感时空三维模型所表达的地带性NPP平均分布状况,展现出较高分辨率的定位、定量的三向地带性分布信息,较详细地刻画了其特殊地段或极端NPP分布的特征,并得到定量或半定量的形成机理分析结果的证明.
The NOVI AVHRR images received from May 1999 to April 2000 were used to calculate the NDVI distribution of vegetation index. The contribution of NPVI distribution to annual NPP distribution was discussed and the corresponding NPP distribution map was calculated. Furthermore, the quantitative model of remote sensing NPP distribution estimation was established by combining the measured NPP field sample data with forest and farmland NPP in Central China and South China. Based on this, NPP and DEM were fitted and analyzed, The results show that the study on the NPP distribution in China has been affected by the low resolution of the image (8 km) Or qualitative analysis of the impact of the law, the conclusions obtained with the reality of a relatively large discrepancy.And through the analysis of the north-south transect in eastern China, the conclusion is that “the level of NPP in mountain forest vegetation and plain areas of agricultural vegetation exist in different regions The former is higher than the latter in the south of China; the NPP in the Huanghuaihai Plain agriculture zone is higher than that in the surrounding hilly region; and the NPP value in Northeast China is in the order from high to low Mountain forests, plains and low mountains. ”Moreover, most of the NPP values in agricultural areas were not significantly different between 25-35 t · hm-2 · a-1. In conclusion, the zonation NPP average distribution, showing high-resolution positioning and quantitative three-dimensional zonal distribution of information, more detailed description of the characteristics of its special section or extreme NPP distribution, and quantitative or semi-quantitative analysis of the formation of the mechanism of the results prove.