济南市植被覆盖时空变化特征研究

Spatiotemporal Variation Characteristics of Vegetation Cover in Jinan City

以2008~2017年时序Landsat影像为数据源,利用像元二分模型提取植被覆盖度,采用趋势分析、M-K检验以及重心转移模型对济南市2008~2017年植被覆盖的时空变化特征进行了研究。结果表明:时间上,植被覆盖度f在0.5左右浮动,总体呈平缓下降趋势,没有突变年份;Ⅲ级(0.35<f≤0.55)植被覆盖面积增长较多,Ⅴ级(f>0.75)植被覆盖面积减少较多。空间上,北部平原和南部山区分布的植被覆盖等级以高等级为主,中部平原分布的植被覆盖等级以低等级为主;植被覆盖的空间变化率呈现南北高、中间低的分布规律;植被覆盖的空间重心分布存在不均衡性,变化情况比较复杂,整体呈现西移的趋势。

Taking the 2008-2017 time-series landsat image as the data source,the vegetation coverage was extracted by using the pixel dichotomous model.Trend analysis,M-K test,and the center-of-gravity transfer model were used to study the spatiotemporal characteristics of vegetation coverage in Jinan from 2008 to 2017.The results showed that:in terms of time,the vegetation coverage floats around 0.5.The overall trend is gradual decline without a sudden change in years.The area of GradeⅢ(0.35<f≤0.55)vegetation coverage increased a lot;the area of GradeⅤ(f>0.75)vegetation coverage decreased a lot.Spatially,the vegetation coverage levels in the northern plains and the mountainous hills in the southern areas are mainly high,and the vegetation coverage in the central piedmont plain is mainly low.The spatial change rate of vegetation coverage shows the distribution law of north-south high and middle low.Meanwhile,the spatial center of gravity distribution of vegetation coverage is uneven;the transfer situation is complicated;and the overall trend is westward.