2005—2021年镇海区植被生态时空变化及其气象驱动力分析

Spatio-temporal Changes of Vegetation Ecology and Its Meteorological Driving Force Analysis in Zhenhai District from 2005 to 2021

基于MODIS-NDVI遥感植被指数和气象数据,利用像元二分模型、相关分析、多元回归等方法分析了2005—2021年镇海区植被生态时空变化特征,并通过碳通量模型计算得到植被生态质量指数和固碳释氧经济效益。以九龙湖生态保护区为例,研究了气温、降水对植被生态的影响。结果表明:①镇海区植被覆盖度和生态质量指数显著提升;②镇海区森林吸收CO_(2)量平均每年增加18.2 g/m^(2),释放O_(2)量平均每年增加13.36 g/m^(2),生态经济效益显著;③降水对镇海区植被覆盖度影响不显著,气温与植被覆盖度呈显著正相关,且对植被覆盖度存在滞后影响特征。

Based on MODIS-NDVI remote sensing vegetation index and meteorological data,we used the dimidiate pixel model,correlation analysis and multiple regression method to analyze the spatio-temporal change characteristics of vegetation ecology in Zhenhai District from 2005 to 2021,and calculated the ecological quality index of vegetation and economic benefits of carbon sequestration and oxygen release by carbon flux model.Taking the Jiulong Lake Ecological Reserve for example,we studied the influence of temperature and precipitation on vegetation ecology.The results show that①the vegetation coverage and ecological quality index of Zhenhai District are significantly improved.②The amount of CO_(2) absorbed by forests in Zhenhai District increases by 18.2 g/m^(2) and the amount of O_(2) released by forests in Zhenhai District increases by 13.36 g/m^(2) per year on average,with significant ecological and economic benefits.③The effect of precipitation on vegetation coverage in Zhenhai District is not significant.The temperature is significantly and positively correlated with vegetation coverage,and has a lagging effect characteristic on vegetation coverage.