湖南省土地利用变化对植被净初级生产力的影响分析  

Analysis of the Impact of Land-Use Change on Net Primary Productivity of Vegetation in Hunan Province

作　　者：曾钲 佘济云[1] 陈彩虹[1] Zeng Zheng;She Jiyun;Chen Caihong(College of Forestry,Central South University of Forestry and Technology,Changsha 410004,Hunan,China)

机构地区：[1]中南林业科技大学林学院,湖南长沙410004

出　　处：《绿色科技》2025年第1期180-187,共8页Journal of Green Science and Technology

基　　金：湖南省自然科学基金项目(编号:2022JJ40875);森林立地质量评价和全周期多功能经营决策平台项目(编号:2022YFD2200505)。

摘　　要：土地利用变化对植被净初级生产力(NPP)的影响和对区域内碳循环及维持生态系统的稳定具有重要现实意义。本文基于CASA模型,估算了湖南省2000年、2005年、2010年、2015年和2020年的植被NPP,分析了植被NPP的时空变化特征,探讨了土地利用变化对植被NPP的影响。结果表明:①湖南省植被NPP先增加后减少,整体呈增加趋势,平均值为599.03gC/(m^(2)·a);在空间上分布不均匀,长株潭都市圈、洞庭湖等区域植被NPP的值较低;②湖南省土地利用变化明显,林地、草地、建设用地面积增加,耕地、未利用地、水域面积减少;③湖南省林地中的植被NPP总量占比最大;其次是草地和耕地;建设用地、水域、未利用地总量最小,变化不明显;④林地、草地面积增加,促进植被NPP增长;耕地面积减少,抑制植被NPP增长。总体上土地利用变化促进湖南省植被NPP的增长。研究结果有利于湖南省优化土地利用结构,为湖南省提升固碳能力提供支撑,为保护生态环境与治理提供参考。The impact of land use change on vegetation net primary productivity(NPP)is of great practical signif-icance for the carbon cycle and the maintenance of ecosystem stability in the region.This study estimated the veg-etation NPP in Hunan Province in 2000,2005,2010,2015 and 2020 based on the CASA model,analyzed the spatial and temporal variation characteristics of NPP,and explored the impact of land use change on vegetation NPP.The results showed that:①vegetation NPP in Hunan Province increased first and then decreased,with an average val-ue of 599.03 gC/(m^(2)·a);the NPP value was uneven in space,and the NPP value in Changzhutan and Dongting Lake was low;②changes in land use in Hunan Province are obvious,with an increase in the area of forest land,grassland and construction land,and a decrease in the area of cultivated land,unused land and water area;③the total NPP of forest land in Hunan Province accounted for the largest proportion followed by grassland and arable land;the total amount of construction land,water area and unused land was the smallest,and the change was not obvious;④the area of forest land and grassland increased,which promoted the growth of vegetation NPP;the de-crease of cultivated land area inhibited the growth of vegetation NPP.In general,land use change promoted the in-crease of vegetation NPP.The results of the study are conducive to the optimization of land use structures in Hu-nan Province,providing support for the enhancement of carbon sequestration capacity in Hunan Province,and providing a scientific basis for the protection of ecological environment and governance.

关 键 词：植被净初级生产力 CASA模型 时空变化 土地利用变化 

分 类 号：F301.24[经济管理—产业经济]