生态科学2024，Vol.43Issue(2)：67-77,11.DOI:10.14108/j.cnki.1008-8873.2024.02.008
桂西南净生态系统生产力时空变化及其影响因素
Temporal and Spatial Variation of Net Ecosystem Productivity and Its Influencing Factors in Southwest Guangxi
摘要
Abstract
Net ecosystem productivity(NEP)is an important index to estimate ecosystem carbon source/sink.Analyzing the spatial and temporal variation characteristics of NEP and its response to climate factors is of great significance to scientifically evaluate the carbon sequestration capacity of regional ecosystem and deal with climate change.Based on remote sensing data,land use data,meteorological data and DEM data,this paper studied the temporal and spatial distribution characteristics of NEP in Southwest Guangxi by using the methods of trend analysis,correlation analysis and residual analysis,and discussed the impact of different climate factors on NEP.The results showed that:(1)The mean value of NEP in the study area had been increasing from 2000 to 2018,with an annual growth rate of 2.0384 g·m-2·a-1 in southwest Guangxi,2.7428 g·m-2·a-1 in non-karst areas,and 0.6817 g·m-2·a-1 in karst areas.(2)In the past 19 years,NEP in the study area had a spatial distribution pattern of high in the northwest and low in the southeast.The area with a very significant increase in NEP(15.39%)was greater than the area with a significant decrease(8.13%),indicating that the carbon sink capacity of the ecosystem in the study area as a whole showed an increasing trend.(3)There was a positive correlation between NEP and temperature and precipitation in study area,but the correlation coefficient between NEP and precipitation(0.0904)was stronger than that with temperature(0.0455).(4)The contribution rates of human activities to the positive and negative effects of NEP in the study area were 50.24%and 49.76%respectively.关键词
净生态系统生产力/变化趋势/时空变化/气候因子/贡献率/桂西南Key words
net ecosystem productivity/changing trends/temporal and spatial variation/climatic factors/contribution rate/Southwest Guangxi分类
生物科学引用本文复制引用
彭倩蓉,田义超,李春燕,梁楚,林谷梅..桂西南净生态系统生产力时空变化及其影响因素[J].生态科学,2024,43(2):67-77,11.基金项目
国家自然科学基金项目(42061020) （42061020）
广西基地和人才项目(2019AC20088) （2019AC20088）
广西自然科学基金联合培育项目(2018JJA150135) （2018JJA150135）
广西创新驱动发展专项(AA18118038) （AA18118038）
北部湾大学高层次人才引进项目(2019KYQD28) （2019KYQD28）
