基于遥感生态指数的赣江新区生态质量评价

Ecological Quality Assessment in Ganjiang New District based on Remote Sensing Ecological Index

随着生态文明建设的不断推进,城市发展面临更高的生态要求,全面、客观、快速、准确的评估区域生态质量成为当前生态研究重点。从绿度、湿度、热度和干度方面选取归一化植被指数(NDVI)、湿度指标(Wet)、地表温度(LST)、归一化建筑-裸土指数(NDSI)4个分量指标,运用主成分分析法集成分量指标,利用遥感生态指数(RSEI)对2007—2017年赣江新区生态质量进行评价,并通过空间分析方法探究空间格局演化特征。结果表明,赣江新区RSEI均值由2007年的0.74增加到2017年的0.76,整体生态质量水平较高;赣江新区大多数区域的RSEI等级由差、中等变为良,其中南昌经济技术开发区变化占比最高(52.77%);与2007年相比,赣江新区2017年的生态质量空间分布整体变化少、北方向和西南方向等局部变化明显。基于RSEI的生态评价可快速监测与评价区域生态质量,为其生态规划和经济发展决策提供参考。

With the continuous advancement of ecological civilization construction,urban development faces higher ecological requirements,and the comprehensive,objective,rapid and accurate assessment of regional ecological quality has become the focus of current ecological research.The study selected normalized difference vegetation index(NDVI),wet index(Wet),land surface temperature(LST),normalized difference building-soil index(NDSI)from the aspects of greenness,humidity,heat and dryness,and then applied the principal component analysis method to integrate the component indicators.The remote sensing based ecological index(RSEI)was used to evaluate the ecological quality of the Ganjiang New District from the year of 2007 to 2017.In addition,the spatial pattern evolution characteristics are explored by spatial analysis methods.The results show that the average RSEI of the Ganjiang new district increased from 0.74 to 0.76 from 2007 to 2017,but the overall ecological quality level was higher.The RSEI level of most areas of the Ganjiang new district changed from poor to medium,and the hightest proportion of change in Nanchang economic and technological development zone is 52.77%.Compared with 2007,the overall pattern of spatial distribution of ecological quality in Ganjiang New District in 2017 has little change,but the local changes in the north and southwest directions are obvious.The ecological assessment based on RSEI can quickly monitor and evaluate the regional ecological quality,and provide reference for its ecological planning and decision-making in economic development.