关键词: 植被覆盖度, 净初级生产力（NPP）, 遥感, 宜昌市

Abstract: Based on remote sensing products of normalized difference vegetation index （NDVI） and net primary productivity （NPP） of terrestrial vegetation, the temporal and spatial variation characteristics and the interrelationship of vegetation coverage and net primary productivity in Yichang City,Hubei Province from 2011 to 2020 were analyzed. The results showed that the vegetation coverage was in good and stable status in Yichang City. The region was dominated by high vegetation coverage areas, and the vegetation coverage in the western mountainous area was higher than that in the eastern plain. The vegetation coverage increased during the study period, and the vegetation coverage in spring and summer was superior to that in autumn and winter. The NPP increased during the study period, and it in the western mountainous area was higher than that in the eastern plain. The annual amount of carbon fixation and oxygen release in the past ten years showed a steady growth trend, and that in the western mountainous area was higher than that in the eastern plain, which was related to land cover types and human activities. There was a highly significant positive correlation（P<0.01） between vegetation coverage and NPP in the study area, and the correlation coefficient between the two reached 0.91. The interannual variation of NPP in regions with different vegetation coverage levels was different, and the NPP in high vegetation coverage areas varied the most significantly, indicating that high vegetation coverage areas had a very important impact on regional productivity.

Key words: vegetation coverage, net primary productivity（NPP）, remote sensing, Yichang City