基于Google Earth Engine的长汀县植被扰动与恢复长时序监测研究  

Research on Long-term Monitoring of Vegetation Disturbance and Restoration at Changting County Based on Google Earth Engine

作　　者：郭英璋 陈文惠[1] 林莉平 洪琴 Guo Yingzhang;Chen Wenhui;Lin Liping;Hong Qin(College of Geographical Sciences,Fujian Normal University/Fuzhou Municipality,Fujian Province 350007,China)

机构地区：[1]福建师范大学地理科学学院,福建福州350007

出　　处：《亚热带水土保持》2021年第4期31-37,47,共8页Subtropical Soil and Water Conservation

基　　金：天地一体化调查数据的信息挖掘与深度应用研究;福建省环保科技计划项目(项目编号:2021R016)。

摘　　要：了解植被扰动与恢复时空特征可为水土流失和生态环境治理提供科学依据。而传统的植被扰动恢复研究主要集中在两期或者几个时期的对比分析,无法掌握植被的连续变化特征,导致植被长期监测和生态环境的评估具有局限性。因此,本文基于Google Earth Engine,以Landsat时间序列数据为基础,通过LandTrendr算法探讨1984~2020年间长汀植被扰动与恢复变化特征,总体识别精度达86.67%。结果表明:近35年来,长汀县植被总体恢复趋势向好,部分区域存在植被扰动,扰动和恢复累计面积分别为181.81km^(2)和292.83km^(2);89.9%的植被扰动发生在2000年以后,植被扰动的平均持续时间为1.2年;植被恢复贯穿始终,植被恢复的平均持续时间为14.65年;植被扰动集中在城镇、乡村、交通路网等人类生产生活和经济社会发展的活跃区域,植被扰动的平均强度为0.33,植被恢复的平均强度为0.21,总体呈现扰动剧烈、恢复慢的特征。本文可为长汀环境治理评估提供客观信息,从而更加科学、合理地制定生态保护措施。Understanding of the spatial and temporal characteristics of vegetation disturbance and restoration can provide the scientific basis for soil erosion and ecosystem management.However,the traditional vegetation disturbance and restoration studies mainly focused on the comparative analysis of two or several periods,which could not grasp the continuous change characteristics of vegetation,resulting in the limitation of long-term monitoring of vegetation and assessment of ecological environment.Therefore,based on Google Earth Engine and Landsat time series data,it was explored the change characteristics of vegetation disturbance and restoration at Changting County during 1984-2020 by LandTrendr algorithm,and the overall recognition accuracy reached 86.67%.The results showed that in the past 35 years at Changting County,the overall trend of vegetation restoration was good,and vegetation disturbance existed in some areas,with the cumulative area of disturbance and recovery of 181.81 km^(2) and 292.83 km^(2),respectively;89.9%of vegetation disturbance occurred after 2000,and the average duration of vegetation disturbance was 1.2 years;the vegetation restoration ran through the whole process with the average duration of 14.65 years.The vegetation disturbance was concentrated in the active areas of human production and life and economic and social development such as towns,villages and transportation road networks,etc.The average intensity of vegetation disturbance was 0.33 and the average intensity of vegetation restoration was 0.21,showing the overall characteristics of intense disturbance and slow restoration.The study can provide objective information for the assessment of environmental management at Changting County,so as to formulate the ecological protection measures more scientifically and rationally.

关 键 词：Google Earth Engine LandTrendr 植被恢复 植被扰动 长汀 

分 类 号：TP753[自动化与计算机技术—检测技术与自动化装置]