摘要
沙化土地封禁保护是通过限制或禁止人类活动来遏制沙化进程的管理措施。采用卫星遥感监测、空中无人机监测、地面样地调查等手段分析宁夏4个国家沙化土地封禁保护区:盐池机械化林场国家沙化土地封禁保护区、灵武市白芨滩防沙林场国家沙化土地封禁保护区、红寺堡区酸枣梁国家沙化土地封禁保护区、中卫市沙坡头区长流水国家沙化土地封禁保护区的植被覆盖度变化情况;采用环境监测因子分析与土地利用变化分析方法,全面评估封禁保护对植被恢复及沙化土地改善的影响。结果表明:1)盐池机械化林场、灵武市白芨滩防沙林场、红寺堡区酸枣梁和沙坡头区长流水的归一化植被指数(NDVI)最大值均值均呈正向增长趋势,2023年比2013年分别提升18.75%、29.16%、30.43%、23.08%。2)2014—2023年,各沙化土地封禁保护区土地沙化程度整体减轻,沙化土地转为轻度和中度沙化土地的面积最大。3)全磷、植被高度、降水、覆沙厚度、沙化程度、有机质6个环境因子是影响植被覆盖度的关键因子。4)各沙化土地封禁保护区内,不同类型环境因子对植被覆盖度的影响由大到小为样地因子、土壤因子、气象因子、地形因子。沙化土地治理应因地制宜配置植被结构,从而实现沙化土地封禁保护区生态系统的稳定恢复与可持续发展。
Enclosure protection of desertified landis a management measure for desertified land,which curbs the process of desertification by restricting or prohibiting human activities.We used satellite remote sensing monitoring,aerial drone monitoring,ground sample survey and other means to monitor the ecological environment change of four national enclosure-conservation areas in Ningxia,and comprehensively evaluated the impact of closed protection on vegetation restoration and sandy land improvement through environmental factors analysis and land-use change analysis.The results show that:1)The average maximum NDVI value of the four enclosure-conservation areas of Yanchi Mechanized Forest Farm,Baijitan Sand Prevention Forest Farm in Lingwu City,Suanzaoliang in Hongsibu District and Changliushui in Shapotou District showed a positive growth trend.Compared with 2013,the average maximum NDVI value of the four enclosure-conservation areas in 2023 increased by 18.75%,29.16%,30.43%and 23.08%,respectively.2)From 2014 to 2023,in enclosure-conservation area,the degree of land desertification is reduced as a whole,and the area of mild and moderate desertified land is the largest.3)Total phosphorus,vegetation height,precipitation,sand cover thickness,desertification degree and organic matter are the key factors affecting the change of vegetation coverage.4)In each enclosureconservation area,the influence of different types of environmental factors on vegetation coverage was ranked in descending order of sample factors,soil factors,meteorological factors,and topographic factors.In the future,desertified land management should be equipped with vegetation structures according to local conditions to achieve stable recovery and sustainable development of the ecosystem.
作者
郭立明
刘宝军
田娜玲
李庆波
李宛盈
GUO Liming;LIU Baojun;TIAN Naling;LI Qingbo;LI Wanying(Ningxia Forestry Investigation and Planning Institute,Yinchuan 750001,China;Northwest Survey and Planning Institute,National Forestry and Grassland Administration,Xi'an710048,China)
出处
《林草资源研究》
北大核心
2025年第3期9-18,共10页
FOREST AND GRASSLAND RESOURCES RESEARCH
基金
国家自然科学基金面上项目“泥漠风沙输移动力过程研究”(42171015)。
关键词
沙化土地封禁保护区
归一化植被指数
植被覆盖度影响因子
沙化土地转移
enclosure-conservation area for desertified land
normalized difference vegetation index
vegetation coverage impact factors
transferof desertified land
