李岩,商冉,曲衍波

• 1:济南市土地储备中心
• 2:山东农业工程学院资源与环境工程学院
• 3:山东财经大学公共管理学院

摘要(Abstract)：

【目的】为揭示陕北黄土高原退耕还林还草前后的植被净初级生产力(NPP)时空演变规律及其对环境变化的响应状态，【方法】基于土地利用模型分析陕北黄土高原1980—2020年的土地利用变化特征，采用改进的CASA模型揭示NPP时空动态，并结合情景分析法探讨了环境变化对NPP的影响。【结果】(1)1980—2020年陕北黄土高原耕地、水体和未利用地减少，林地、草地和建设用地增加；退耕还林还草前的综合土地利用动态度为2.24%,9 086.25 km~2的土地参与转移，以未利用地转出为草地为主；退耕还林还草后的综合土地利用动态度为22.15%,12 340.88 km~2的土地参与转移，以耕地转出为林地、草地和建设用地为主。(2)以2000年(退耕还林还草)为界，研究区40 a间NPP先减后增，整体增加了271.66 gC·m~(-2)·a~(-1);空间上呈现南高北低的分布特征，整个研究期内98.54%的区域出现了NPP增加的现象；不同土地利用类型多年NPP均值大小排列为：林地>草地>耕地>建设用地>水体>未利用地。(3)退耕还林还草实施前，土地利用、NDVI、降雨和气温变化对陕北黄土高原NPP变化的贡献率分别为0.14%、47.22%、42.07%和10.57%;退耕还林还草实施后，NDVI变化对该地区NPP的变化贡献率高达85.42%,土地利用、降雨和气温变化的贡献率较低，分别为0.33%、9.67%和4.58%。【结论】随着退耕还林还草的实施，陕北黄土高原土地利用整体变化速率加快；NPP年均值增加、高值区范围扩大，生态状况得到明显改善；NDVI变化成为该地区NPP变化的主导因素。

关键词(KeyWords)： 退耕还林还草;植被净初级生产力;CASA模型;环境变化;陕北黄土高原

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金面上项目(42077434);; 山东省高等学校“青年创新团队发展计划”项目(2019RWG016)

作者(Author): 李岩,商冉,曲衍波

DOI: 10.13928/j.cnki.wrahe.2023.06.014

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