长白山北坡施业区植被变化及其驱动力分析  

Analysis of vegetation changes and driving factors in the cultivated area on the north slope of Changbai Mountains

作　　者：孙悦 刘琪璟[1,2] SUN Yue;LIU Qijing(College of Forestry,Beijing Forestry University,Beijing 100083,China;Key Laboratory of Forest cultivation and conservation of Ministry of Education,Beijing Forestry University,Beijing 100083,China)

机构地区：[1]北京林业大学林学院,北京100083 [2]北京林业大学森林培育与保护教育部重点实验室,北京100083

出　　处：《中南林业科技大学学报》2024年第5期125-133,166,共10页Journal of Central South University of Forestry & Technology

基　　金：国家科技基础资源调查专项(2019FY101602)。

摘　　要：【目的】检测长白山北坡植被的变化趋势,分析植被分布与不同因素之间的关系以及森林干扰的变化情况,以期更加全面地揭示天然林资源保护工程前后研究区植被的变化情况,为评价天然林资源保护工程实施效果及制定植被资源恢复措施和生态环境保护政策提供科学依据。【方法】基于Google Earth Engine(GEE)地理数据分析云平台,使用1987—2020年的Landsat遥感数据,采用归一化植被指数(NDVI)、归一化燃烧率(NBR),结合Sen-Theil趋势分析、Mann-Kendall检验、地理探测器和LandTrendr变化检测算法,分析了白河林业局的植被覆盖时空分布特征及变化趋势,结合年均温、年平均降水量、海拔、坡度、林种和森林类型数据,研究了不同因子对植被覆盖空间分布特征的影响,并进一步分析了不同年份的森林干扰情况。【结果】1)1987—2020年研究区总体NDVI呈现提高趋势,在2000年大部分地区呈现不显著下降的趋势,而天保工程实施后研究区NDVI整体呈现上升趋势,尤其是初期提高趋势最为显著;2)温度和降水量对于NDVI空间分布的解释力最强,其次是森林类型和海拔;3)1987—2020年研究区的年干扰面积总体呈现出波动下降的趋势。2000年前森林干扰较为频繁,2000年开展天然林资源保护工程后森林干扰面积明显下降,且森林干扰主要发生在研究区中部以及北部部分区域,南部的落叶针叶林区域在研究时间内未观察到明显的干扰现象。【结论】近30年来长白山北坡植被总体呈现改善趋势,且天然林资源保护工程在植被改善以及降低干扰方面均发挥了重要作用。【Objective】Monitoring vegetation change trends on the north slope of Changbai Mountain,analyzing the relationship between vegetation distribution and different factors and changes in forest disturbance,with a view to revealing more comprehensively the vegetation changes in the study area before and after the Natural Forest Resource Protection Project,it provides a scientific basis for evaluating the effect of the Natural Forest Resource Protection Project and formulating vegetation resource restoration measures and ecological environment protection policies.【Method】Based on the Google Earth Engine(GEE)platform,this study used Landsat remote sensing data from 1987 to 2020,using normalized difference vegetation index(NDVI)and normalized combustion rate(NBR),based on Sen-Theil trend analysis,Mann-kendall test,geographic detector and LandTrendr change detection algorithm,the temporal and spatial distribution characteristics and change trend of vegetation cover in Baihe Forestry Bureau were analyzed.Based on the data of annual mean temperature,average annual precipitation,altitude,slope,forest category and forest type,the effects of different factors on the spatial distribution of vegetation cover were studied.【Result】From 1987 to 2020,the overall NDVI in the study area showed an increasing trend,while in 2000,it showed a non-significant decreasing trend in most areas,in particular,the first stage of the Natural Forest Resource Protection Project was the most significant trend of improvement;The spatial distribution of NDVI was strongly explained by temperature and precipitation,followed by forest type and altitude;From 1987 to 2020,the annual disturbance area of the study area showed a fluctuating and decreasing trend.Before 2000,forest disturbance was relatively frequent.After the implementation of the Natural Forest Protection Project in 2000,the area of forest disturbance decreased significantly,and forest disturbance mainly occurred in the central and northern parts of the study area,no significant di

关 键 词：天然林资源保护工程 植被动态 地理探测器 LandTrendr 森林干扰 

分 类 号：S771.8[农业科学—森林工程]