通辽市植被生态质量变化分析

Analysis of Eco-Environment Quality Variation of Vegetation in Tongliao City

为研究通辽市植被生态质量变化特征,文章利用MODIS归一化植被指数(NDVI)和气象监测资料,分析了通辽市2000—2019年生长季植被覆盖度、净初级生产力(NPP)以及植被生态质量指数变化特征,并分析了三者与气候因子的相关关系,以期为建设“生态通辽”提供决策依据。结果表明:(1)研究区生长季植被覆盖度平均值从2000年的36.26%上升至2019年的49.57%,平均每年增加0.54%;(2)研究区植被NPP平均值从2000年的198.04 gC·m^(2)增加到2019年的404.54 gC·m^(2),平均每年增加8.63 gC·m-2;(3)研究区植被生态质量指数平均值由2000年40.28增加到2019年的70.87,平均每年增加1.25,2019年植被生态质量达到2000年以来最好;(4)研究区生长季植被覆盖度、植被NPP、植被生态质量指数与生长季平均气温呈不显著的负相关,与降水量呈极显著的正相关,表明降水量是研究区植被生态质量显著正向因子。

This paper studied the characteristics of the ecological quality variation of vegetation in Tongliao,to provide decisionmaking basis for the construction of"Ecological Tongliao"city.The temporal and spatial characteristics of vegetation coverage,net primary productivity(NPP)and vegetation ecological quality data were analyzed based on MODIS Normalized Difference Vegetation Index(NDVI)and meteorological monitoring data during growing season from 2000 to 2019.The results showed that:(1)The mean vegetation coverage increased from 36.26%in 2000 to 49.57%in 2019,with an average increase of 0.54%every year.(2)The mean NPP value of vegetation increased from 198.04 gC·m^(2)in 2000 to 404.54 gC·m^(2)in 2019,with an average increase of 8.63 gC·m^(2)every year.(3)The vegetation ecological quality increased from 40.28 in 2000 to 70.87 in 2019,with an average increase of 1.25 every year.Particularly the vegetation ecological quality in 2019 was the best since 2000.(4)The mean vegetation coverage,vegetation NPP,and vegetation ecological quality were insignificantly negatively correlated with the average temperature of the growing season,and had a very significant positive correlation with precipitation,which showed that precipitation was a significant positive factor of vegetation ecology in the study area.