生态学报2017，Vol.37Issue(18)：5924-5934,11.DOI:10.5846/stxb201606301342
基于MODIS序列的北京市土地利用变化对净初级生产力的影响
Effects of land-use change on net primary productivity in Beijing based on the MODIS series
摘要
Abstract
Understanding the impact of land-use change on Net Primary Productivity (NPP) is important in the elucidation of the relationship between the carbon assimilation ability of vegetation and land-use changes at the regional scale,which is also critical to the maintenance of regional ecological safety.Using Beijing as a case study,we analyzed the spatiotemporal distribution of NPP,and the impact of land-use changes based on land-use maps and MODIS data downscaled by 30-m resolution Landsat TM images from 2000 to 2012.The results revealed significant linear relationships between Landsat NDVI and MODIS NPP (R2 values between 0.22 and 0.68,P ＜ 0.01) and these linear functions were used to downscale the NPP data for this region.The NPP levels were also significantly affected by the area allocation and distribution of different land-use types.From 2000 to 2012,areas of woodland and grassland increased rapidly,whereas the area of farmland declined.Overall,the NPP of Beijing increased from 1.23 million t C to 1.9 million t C,and 66％ of NPP was contributed by woodlands,followed by farmland (26％) and grassland (8％).For 2000 to 2006,land area variations benefited NPP growth and contributed 34％ to its change,whereas the variations from 2006 to 2012 impeded NPP growth and contributed 27％ to the change.Moreover,reduction of patch aggregation,and increment in patch density and patch richness density contributed to the enhancement of NPP.The results suggest that maintaining the current vegetation quantity and quality,and increasing local landscape heterogeneity and diversity would improve NPP in Beijing.关键词
土地利用变化/净初级生产力/MOD17A3 NPP/时空变化/景观格局指数Key words
land-use change/net primary productivity/MOD17A3 NPP/spatiotemporal variation/landscape index引用本文复制引用
成方妍,刘世梁,张月秋,尹艺洁,侯笑云..基于MODIS序列的北京市土地利用变化对净初级生产力的影响[J].生态学报,2017,37(18):5924-5934,11.基金项目
国家自然科学基金重点项目(41530635) （41530635）
国家自然科学基金面上(41571173) （41571173）
