呼伦贝尔植被覆盖时空变化特征及其与气候的相关性分析

Spatial-temporal Characteristics of Vegetation Cover and the Correlation with Climate in Hulunbeir

基于长时间序列的遥感数据和气象数据,通过相关分析、趋势分析等方法,详尽分析了呼伦贝尔地区植被覆盖状况变化及其与气候的关系,得出以下主要结论:(1)20世纪80、90年代,呼伦贝尔以湿润气候区为主;进入21世纪后,气候呈现明显的暖干化趋势,尤其是大兴安岭林区北部、中部及东南部及呼伦贝尔草原的西南部地区湿润度指数呈显著减小趋势,半干旱和半湿润气候区在空间分布上占据了主要地位;(2)呼伦贝尔地区总体上表现出较高植被覆盖区面积减小、较低植被覆盖区面积增大的变化趋势,尤其是21世纪最初的十年,呼伦贝尔草原区的植被退化状况不容忽视,呼伦贝尔草原区中东部部分地区植被覆盖呈下降趋势;(3)呼伦贝尔草原西部、大兴安岭东南部农区部分地区的植被覆盖状况与湿润度指数呈正相关关系,而大兴安岭林区的中北部地区二者则呈负相关关系。

Based on remote sensing data and meteorological data of long time series,the characteristics of climate change and its correlation with vegetation cover in Hulunbeir League was analyzed.The main conclusions were as follows.(1) In the 1980 s and 1990 s,Hulunbeir was dominated by humid climate areas.When entering the 21 st century,the climate of Hulunbeir showed a trend of warmer and drier.Semi-arid and semi-humid climate areas were the main type in spatial distribution,especially in the northern,central and southeastern regions of Daxinganling forest region and the southwest of Hulunbeir grassland.(2) From the point of view of vegetation cover alone,Hulunbeir area generally showed a decreasing of high vegetation cover area and the increasing trend of lower vegetation cover area,especially in the first ten years of the 21 st century.The vegetation degradation of Hulunbeir grassland area could not be ignored,especially in the central and eastern part of Hulunbeir grassland area.And the vegetation cover shows a downward trend.(3) There was a positive correlation between vegetation cover and wetting index in western Hulunbeier grassland and some agricultural areas in southeast Daxinganling,while a negative correlation was found between vegetation cover and wetting index in the north-central part of Daxinganling forest region.