青海省固碳释氧量时空变化及其影响因素分析

Temporal and Spatial Variation of Carbon Sequestration and Oxygen Release in Qinghai Province and the Influencing Factors

针对青海省特殊而重要的生态地位,以2001—2020年NPP数据为基础,结合气象、土地利用等数据,采用相关性分析、地理加权回归模型等方法计算分析青海省固碳释氧量时空变化及其影响因素。结果表明,青海省固碳释氧量呈由北到南、由西到东增加的趋势;20年间青海省固碳释氧量呈弹性增长趋势,年均增长量为0.005 kg/m^(2),58.04%的区域固碳释氧量变化率为0~2%。研究表明,实施生态保护修复工程对固碳释氧量的增长起到重要推动作用;青海省固碳释氧量与年均温和年降水量均呈正相关,东部及北部固碳释氧量的主要影响因子为降水,西部及南部主要影响因子为温度。

In view of the unique and crucial ecological status of Qinghai Province,based on the NPP from 2001 to 2020,the meteorological and land use data,the correlation analysis and geographically weighted regression model were used to calculate and analyze the temporal and spatial variation of carbon sequestration and oxygen release in Qinghai Province and its influencing factors.The results showed that the trend of carbon sequestration and oxygen release in Qinghai Province was increasing from north to south and from west to east;during the past 20 years,the carbon sequestration and oxygen release in Qinghai Province showed an elastic growth trend,with an average annual growth of 0.005 kg/m^(2),and the change rate of carbon sequestration and oxygen release in 58.04%of the regions was 0%~2%.The study showed that the implementation of ecological protection and restoration projects played an essential role in promoting the growth of carbon sequestration and oxygen release;carbon sequestration and oxygen release in Qinghai Province were positively correlated with the average annual temperature and annual precipitation,and the main influencing factor of carbon sequestration and oxygen release in the east and north was precipitation.In contrast,temperature was the main influencing factor in the west and south.