生态环境学报2024，Vol.33Issue(6)：831-840,10.DOI:10.16258/j.cnki.1674-5906.2024.06.001
广东省不同生态系统植被NPP时空变化及对气候因子的响应
Spatiotemporal Variations of Vegetation NPP of Different Ecosystems in Guangdong Province and Its Response to Climate Factors
摘要
Abstract
There are abundant vegetation types in Guangdong Province and studying the response of vegetation net primary productivity(NPP)in different ecosystems to climatic factors is important for improving the quality of the ecological environment.Based on land cover type,vegetation NPP,and meteorological observation data,the spatiotemporal characteristics of vegetation NPP in different ecosystems in Guangdong Province and their responses to climate factors were analyzed.The results showed that the average temperature and precipitation in Guangdong Province exhibited a slight upward trend from 2000 to 2020,with area proportions of positive growth accounting for 86.8%and 64.8%,respectively.Sunshine hours showed a downward trend,with the area proportion of negative growth accounting for 82.4%.Vegetation NPP showed a fluctuating upward trend,with an average annual value of 1011 g∙m-2 and an annual growth value of 6.7 g∙m-2∙a-1.The positive growth zone accounted for 91.9%of the provincial area.The average annual NPP of the forest ecosystem and the proportion of positive growth areas were highest at 1107 g∙m-2 and 95.6%,respectively.The average annual NPP of wetland ecosystems and the proportion of positive growth areas were the lowest,at 686 g∙m-2 and 89.5%,respectively.Vegetation NPP showed significant positive correlations with temperature,precipitation,and sunshine hours,with correlation coefficients of 0.81,0.48,and 0.68,respectively.The correlation coefficients all passed the significance test at p=0.001,which showed that temperature had the most significant impact on vegetation NPP,followed by sunshine hours and precipitation.Temperature and sunshine hours had the greatest impact on forest ecosystem NPP,and the smallest impact on wetland ecosystems.Precipitation has the greatest impact on farmland ecosystems and the smallest impact on wetland ecosystems.Regarding response time,the correlation coefficients between NPP and temperature,as well as NPP and sunshine hours,reached their maximum values in the current month,whereas the correlation coefficient between NPP and precipitation reached its maximum in the following month.This means that there were no lags in NPP response to temperature and sunshine hours.Regarding the duration of the impact,the correlation coefficient between temperature and NPP was relatively high from the current month to the following two months,that between sunshine hours and NPP was relatively high in the current month,and that between precipitation and NPP was relatively high from the current month to the following three months.Therefore,the impact of precipitation on NPP was the greatest.关键词
净初级生产力/气候因子/生态系统/时空变化/响应Key words
net primary productivity/climate factors/ecosystem/spatiotemporal variations/response分类
农业科技引用本文复制引用
王捷纯,邓玉娇,朱怀卫,孔蕴淇..广东省不同生态系统植被NPP时空变化及对气候因子的响应[J].生态环境学报,2024,33(6):831-840,10.基金项目
广东省气象局科学技术研究项目(GRMC2022M08) （GRMC2022M08）
广东省气象局科技创新团队项目(GRMCTD202101) （GRMCTD202101）
