2009—2018年京冀生态水源保护林区生态系统变化特征

Characteristics of Ecosystem Changes in Beijing-Hebei Eco-water Source Conservation Forest Region from 2009 to 2018

基于遥感数据和地面观测数据,从归一化植被指数(NDVI)和实施工程图斑效果显著程度对京冀生态水源保护林区前后10年变化进行对比分析。结果表明:(1)宏观尺度从总体植被指数分析,2009—2018年平均植被指数呈总体增长趋势,总体涨幅达17.6%;从工程实施区县看,各区县植被指数也均呈上升趋势,其中沽源、崇礼、丰宁和赤城4县(区)的植被增加幅度均超过了平均增长水平。(2)微观尺度从工程实施图斑造林效果显著(有无受干扰)和不显著进行分析,2009—2018年工程实施造林效果显著的面积所占比例均在96%以上,其受干扰现象也呈逐年下降的趋势。经过实地调查验证,项目工程成效遥感监测结果与实际相符,准确度较高。

Based on RS data and ground observation data,this paper compared the change of vegetation sequence in Beijing-Hebei eco-water source conservation forest region before and after the project by NDVI and implementation effect of engineering drawings.The results showed that:(1)From the analysis of the total vegetation index,the growth trend of vegetation kept increasing from 2009 to 2018,and the effect of vegetation restoration reached 17.6%.According to the situation of each county(district)in the project area,the vegetation index also showed an upward trend,especially in Guyuan,Chongli,Fengning and Chicheng Counties.(2)From the analysis of the project implementation effect,the significant proportion of the project effect in 2009-2018 was above 96%.The disturbed phenomenon was decreasing year by year,the overall project effect was good.The results of remote sensing monitoring of project effectiveness were in good agreement with the actual situation,and the accuracy was high.