2005—2020年海南岛植被净初级生产力(NPP)时空变化特征分析

Spatio-Temporal Variation Characteristics of Net Primary Production in Hainan Island from 2005 to 2020

基于MODIS遥感数据提取的海南岛NPP数据,结合气象因子数据,统计并对比分析了2005—2020年海南岛主要植被NPP变化及其气候响应关系。结果表明:16年间海南岛植被NPP整体呈现在波动中缓慢增加趋势;NPP空间分布呈现自中南向四周沿海递减,16年间大部分地区NPP值基本不变,沿海地区增长明显,中北部区域有所降低;NPP与气温呈负相关,与降水呈正相关,NPP对温度变化响应的敏感度高于降水,不同植被类型NPP对气温和降水相关性排序为草地>林地>耕地。研究结果可为海南岛植被碳储量状况及生态环境调节与修复提供数据支持。

Based on the NPP data of Hainan island extracted from MODIS remote sensing data and combined with meteorological data,the NPP changes of main vegetation in Hainan island and its climate response relationship from 2005 to 2020 were statistically analyzed and compared.The results showed that the NPP of Hainan island vegetation showed a trend of slow increase in the last 16 years;The spatial distribution of NPP decreased from the central south to the coastal areas,and NPP values remained basically unchanged in most areas during 16 years,increasing significantly in coastal areas,and decreasing somewhat in central and northern areas;NPP was negatively correlated with temperature,positively correlated with precipitation,and was more sensitive to the change of temperature then precipitation.Correlation between NPP at different land cover and temperature,precipitation was grassland>woodlands>farmland.There results can provide data support for the status of vegetation carbon storage and the regulation and restoration of environment in Hainan island.