重庆岩溶区和非岩溶区植被净初级生产力时空演变特征及其驱动因素  

Comparative study on spatio⁃temporal evolution and driving factors of NPP in karst and non⁃karst areas of Chongqing

作　　者：李慧 魏兴萍[1,2,3] LI Hui;WEI Xingping(College of Geography and Tourism,Chongqing Normal University,Chongqing 401331,China;Chongqing Key Laboratory of Wetland Science Research in the Upper Reaches of the Yangtze River,Chongqing 401331,China;Chongqing Field Scientific Observation and Research Station of Surface Ecological Process in the Three Gorges Reservoir Area,Chongqing 401331,China)

机构地区：[1]重庆师范大学地理与旅游学院,重庆401331 [2]长江上游湿地科学研究重庆市重点实验室,重庆401331 [3]三峡库区地表生态过程重庆市野外科学观测研究站,重庆401331

出　　处：《生态学报》2025年第5期2479-2493,共15页Acta Ecologica Sinica

基　　金：重庆市自然科学基金项目(cstc2021jcyj⁃msxmX0616)。

摘　　要：植被净初级生产力(Net primary productivity,NPP)反映了植被的生长状况和生态系统的稳定性,对陆地生态系统可持续发展和生态系统碳循环具有重要意义。研究基于CASA模型估算的2000—2021年岩溶区和非岩溶区植被NPP值,运用Sen趋势+MK检验法分析植被NPP的时空分布及动态演变,基于地理探测器探究岩溶区和非岩溶区植被NPP空间分异的主要驱动因素。结果表明:(1)岩溶区年际和季节植被NPP均值高于非岩溶区,两者夏季植被NPP值最高,冬季最低;岩溶区年际、春季和冬季植被NPP增加速率低于非岩溶区,夏季减少速率高于非岩溶区。(2)岩溶区和非岩溶区植被NPP年均值集中分布在500—700gC m^(-2)a^(-1)之间,呈缓慢增加趋势;岩溶区生态修复工程效果显著,植被NPP高值区面积占比高于非岩溶区;植被NPP低值区主要分布在主城区及长江沿岸城镇建设区,岩溶区面积占比低于非岩溶区。(3)植被NPP空间分异受自然和人为因素的共同作用。气温、降水量、人口密度和土地利用类型是岩溶区植被NPP变化的主要驱动因素,人口密度、土地利用类型、高程和降水量是非岩溶区植被NPP变化的主要驱动因素,驱动因素之间对植被NPP变化存在双因子增强或非线性增强的交互作用。研究结果能够为区域生态保护、生态修复和可持续发展研究提供科学依据。Net primary productivity(NPP)reflects the growth status of vegetation and the stability of ecosystems,which is of great significance for the sustainable development of terrestrial ecosystems and the carbon cycle of ecosystems.Based on the CASA model,this study estimated the vegetation NPP values in karst and non⁃karst regions from 2000 to 2021.Theil⁃Sen Median trend analysis and Mann⁃Kendall test methods were used to analyze the spatial and temporal distribution and dynamic evolution of vegetation NPP.Geographical detectors were employed to explore the main driving factors of vegetation NPP spatial differentiation in karst and non⁃karst regions.The results indicate that:(1)The mean annual and seasonal vegetation NPP in the karst region was higher than that in the non⁃karst region,with the highest NPP values in summer and the lowest in winter.The rate of increase in annual,spring,and winter vegetation NPP in the karst region was lower than that in the non⁃karst region,while the rate of decrease in summer was higher.(2)The average annual vegetation NPP in both karst and non⁃karst regions was concentrated between 500-700 gC m^(-2) a^(-1),showing a slow increasing trend.The ecological restoration project in the karst region was effective,with a higher proportion of areas with high vegetation NPP than in the non⁃karst region.The low NPP areas were mainly distributed in urban areas and along the Yangtze River,with a lower proportion in the karst region than in the non⁃karst region.(3)The spatial differentiation of vegetation NPP was influenced by both natural and anthropogenic factors.Air temperature,precipitation,population density,and land use type were the main driving factors for vegetation NPP changes in the karst region,while population density,land use type,elevation,and precipitation were the main driving factors in the non⁃karst region.There were interactive effects of dual⁃factor enhancement or nonlinear enhancement among the driving factors on vegetation NPP changes.The findings of this

关 键 词：岩溶区和非岩溶区 CASA模型 植被净初级生产力 时空演变特征 影响因素 

分 类 号：Q94[生物学—植物学]