基于Landsat TM/OIL的济宁市植被覆盖度动态变化分析

2021-01-03 11:27:48陈峰
河南科技 2021年22期

陈峰

摘 要:基于Landsat TM/OIL遥感数据,运用归一化植被指数与像元二分模型,反演了1989—2018年4个时期的山东省济宁市植被覆盖度,从时间和空间两个方面分析了济宁市30年的植被覆盖度动态变化状态。结果表明,济宁市植被覆盖度空间分布总体表现为北部和西部地区高于南部和东部地区,时间变化表现为前20年先升高而后10年降低,最终整体趋于稳定。低植被覆盖区域主要集中在城区和矿区,植被覆盖改善区域主要分布在山地丘陵地区,植被空间分布差异较大。

关键词:植被覆盖度;归一化植被指数;时空分布

中图分类号:TTP751;Q948 文献标识码:A 文章编号:1003-5168(2021)22-0129-05

Abstract: In this paper, based on Landsat TM/OIL remote sensing data, the normalized vegetation index method and the pixel dichotomy model were used to retrieve the fraction of vegetation cover(FVC) of Jining City in the four stages from 1989 to 2018, the dynamic changes of FVC in Jining City in the past 30 years were analyzed. The results showed that the spatial distribution of FVC in Jining City was generally higher in the north and west than in the south and east, the change of the time distribution manifested as an increased first and then a decrease, and finally showed a stable trend as a whole. Areas with low FVC cover were mainly concentrated in urban areas and mining areas, and areas with improved FVC were mainly distributed in mountainous and hilly areas, with large differences in the spatial distribution of vegetation.

Keywords: fraction of vegetation cover;normalized vegetation index;temporal and spatial distribution

植被是生态系统的重要组成部分,在自然地理环境中起着重要作用,被作为评判地区生态质量好坏的重要标准。受城市建设发展、资源开发利用以及植被保护相关政策的影响,区域植被覆盖演变越来越受到重视。山东省济宁市作为典型的煤炭资源型城市,伴随着矿产资源开采、城市扩张,植被生态受到了一定程度的影响。本文利用Landsat TM/OIL影像数据,反演济宁市1989—2018年的植被覆盖动态变化情况,分析植被覆盖度时空演变规律,分级研究植被覆盖变化情况,探究济宁市的生态发展状况,从而为区域生态建设提供参考。

1 研究区与数据源

1.1 研究区概况

济宁市隶属山东省,辖2个市区(任城区、兗州区),代管2个县级市(曲阜市、邹城市),7个县(汶上县、梁山县、微山县、嘉祥县、鱼台县、金乡县、泗水县)(见图1),地处鲁中南山地丘陵区与……

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