新安江流域安徽段NDVI时空分布特征研究

Study on the Spatiotemporal Distribution Characteristics of NDVI in the Anhui Section of the Xin'an river Basin

新安江流域生态补偿机制起始于2012年。在十年的时间里,皖浙两省为此做出了大量的资金投入。为了探究新安江补偿机制实施以来上游流域的生态变化情况,本文以归一化植被指数(NDVI)数据为单一指标,基于2011年、2016年和2020年的MOD13Q1数据,利用一元线性回归趋势法分析补偿机制实施之前、实施中以及实施末三个期次的新安江流域NDVI的时空变化特征。结果表明,新安江流域3个时间断面的NDVI均值分布在0.78~0.81,第一轮补偿机制实施后NDVI轻微上升,之后保持稳定;NDVI在空间上的分布特征为中部低、周边高,NDVI低值区域与城镇的分布相吻合,补偿机制实施后,NDVI低值区相对减少;城镇的扩张是NDVI轻微变差的主要原因,原有城镇的NDVI总体呈增长趋势。从NDVI数值上看,新安江流域安徽段生态质量较好。

The ecological compensation mechanism in the Xin'an River Basin began in 2012.Over the past decade,Anhui Province and Zhejiang Province have made significant financial investments for this.In order to explore the ecological changes in the upstream basin since the implementation of the Xin'an River compensation mechanism,using the normalized difference vegetation index(NDVI)data as a single indicator and based on MOD13Q1 data from 2011,2016,and 2020,this paper uses the univariate linear regression trend method to analyze the spatiotemporal changes of NDVI in the Xin'an River Basin before,during,and after the implementation of the compensation mechanism.The results show that the average distribution of NDVI in the three time sections of the Xin'an River Basin is 0.78~0.81,after the implementation of the first round of compensation mechanism,NDVI slightly increases and remains stable thereafter;the spatial distribution characteristics of NDVI are low in the middle and high in the surrounding areas,the low value areas of NDVI are consistent with the distribution of towns,after the implementation of compensation mechanisms,the low value areas of NDVI are relatively reduced;the expansion of towns is the main reason for the slight deterioration of NDVI,and the overall NDVI of existing towns is showing an increasing trend.From the perspective of NDVI values,the ecological quality of the Anhui section of the Xin'an River Basin is relatively good.