摘要
在全球气候变暖的背景下,研究流域植被覆盖度的时空变化及对气候变化的响应对辽河流域的生态环境建设具有重要参考价值。基于2000—2018年研究区分辨率为250m×250m的MODIS-NDVI遥感数据、同期流域温度和降水量数据,借助MVC最大合成、变异系数、趋势分析、Hurst指数、偏相关分析等方法,得出辽河流域近19年植被覆盖空间分布、变化特征、演变趋势以及气象要素对NDVI变化的响应关系。结果表明:(1)在时间上,辽河流域19年来NDVI月平均波峰值集中在6—8月份,7月份达到最大。在年际变化方面,辽河流域植被覆盖呈缓慢增长的趋势。(2)在空间上,辽河流域植被覆盖度整体较好,空间分布由东向西递减,低植被覆盖区域(<0.3)约占流域总面积的37.78%,高植被覆盖区域(>0.4)约占流域总面积的14.93%。(3)植被覆盖变异方面,研究区整体呈低和较低波动的变化状态,共占90.60%。东西区域的波动差异较为明显。(4)在变化趋势上,约46.50%的地区植被覆盖得到了改善,约36.99%的区域植被覆盖基本没有发生变化。(5)温度、降水对辽河流域植被生长整体表现为促进作用。近19年来辽河流域植被覆盖整体在不断改善。
Under the background of drastic global climate change, studying the spatiotemporal change of vegetation coverage and the response to climate change is of great significance to the ecological construction of the Liao River Basin. Based on MODIS-NDVI remote sensing data of 250 m×250 m, temperature and precipitation data in the study region from 2000-2018,Maximum Synthesis, and Spatial Superposition were used to analyze the spatial-temporal distribution, variation characteristics,evolution trend of vegetation, and response of meteorological elements to the alterations of NDVI in the Liao River Basin over the past 19 years. The results showed that:(1) In terms of time, the peaks of monthly average NDVI over the last 19 years occurred mainly in June-August, and the maximum was 0.64 in July. In the interannual variation, the vegetation coverage appeared a relatively slow growth tendency.(2) Spatially, the vegetation coverage in the Liao River Basin was relatively doing well during the study period. The spatial distribution of vegetation coverage decreased from east to west. The low vegetation coverage area with an average NDVI of less than 0.3 for many years accounted for approximately the total area of the basin 37.78%, and the area covered by high vegetation greater than 0.4 occupied about 14.93%.(3) In the NDVI variation, 90.06% vegetation coverage had a low fluctuation, thereinto the fluctuations between east and west are more obvious.(4) In terms of variation trends, about 46.50% of the area’s vegetation coverage was improved, and about 36.99% was remained basically untransformed.(5) Temperature and precipitation were positive factors for the overall vegetation growth in the study area. The overall vegetation coverage was continuously improving over the past years.
作者
朱丽亚
胡克
孙爽
ZHU Liya;Hu Ke;SUN Shuang(School of Marine Sciences,China University of Geosciences(Beijing),Beijing 100083,China)
出处
《生态科学》
CSCD
2022年第3期203-213,共11页
Ecological Science
基金
国土资源部地质环境治理专项(3-4-2014-175)。
