Land-use/land-cover change in east China and its possible effects on carbon cycle of terrestrial ecosystems in the last 20 years

摘要

Much attention is focused on Land-use / Land-cover changes (LUCC) in recent years in the field of geographical studies, not only because it is one the most important contents of global environmental change, but also for the reason that it can affect terrestrial carbon cycle greatly, which plays an important role in warming the earth. Together with some data collected from the State Statistical Bureau and the State Land Administration, remotely sensed data (NOAA / AVHRR Imagery) is also used to study land-use change in east China during the last 20 years. It is clear that the land structure changes greatly in this period. More important, the farmland, grassland and forest have been changed more than any other elements. In the meantime, impacts of land-use change on land-cover change in the area are also analyzed by studying change of the Normalized Difference Vegetation Index (NDVI). Finally, it is estimated that based on such changes, the net primary productivity in east China during last 20 years may increase. The preliminary analysis shows that a relative steady increase in terrestrial net primary productivity is acknowledged. In another word, it seems that vegetation has sequestrated more carbon these years in east part of China.