摘要
利用归一化植被指数(NDVI)和陆地植被净初级生产力(NPP)的遥感产品数据,分析2011—2020年湖北省宜昌市植被覆盖度与净初级生产力的时空变化特征及两者之间的关系。结果表明,宜昌市植被覆盖情况良好稳定,全市以高植被覆盖为主,西部山区植被覆盖度高于东部平原;植被覆盖度呈增长趋势,且春季和夏季植被覆盖度高于秋季和冬季。NPP呈增长趋势,且西部山区NPP高于东部平原。固碳量和释氧量呈增长趋势,且西部山区固碳量和释氧量高于东部平原,固碳释氧能力与不同土地覆盖类型和人类活动有关。植被覆盖度与NPP在研究区域内具有极显著(P<0.01)的正相关关系,两者相关系数高达0.91。不同植被覆盖度等级区域的NPP年际变化均存在差异,其中高植被覆盖区变化趋势最明显,说明高植被覆盖区对区域生产力的影响非常重要。
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 vegeta⁃tion 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.
作者
张丽
程晋昕
万君
刘俊
成勤
ZHANG Li;CHENG Jin-xin;WAN Jun;LIU Jun;CHENG Qin(Yichang Meteorological Bureau,Yichang 443000,Hubei,China;Yunnan Climate Center,Kuming 650034,China;Wuhan Regional Climate Center,Wuhan 430074,China)
出处
《湖北农业科学》
2022年第21期26-31,共6页
Hubei Agricultural Sciences
基金
湖北省气象局科技基金发展项目(2022Y17)。
关键词
植被覆盖度
净初级生产力(NPP)
遥感
宜昌市
vegetation coverage
net primary productivity(NPP)
remote sensing
Yichang City
