生态环境学报 ›› 2024, Vol. 33 ›› Issue (8): 1163-1173.DOI: 10.16258/j.cnki.1674-5906.2024.08.001

• 研究论文【生态学】 •    下一篇

甘肃省植被时空动态变化及其归因分析

戴晓爱1,2,3(), 马佳欣2, 唐艺菱2, 李为乐1   

  1. 1.成都理工大学/地质灾害防治与地质环境保护国家重点实验室,四川 成都 610059
    2.成都理工大学地理与规划学院,四川 成都 610059
    3.成都理工大学数字胡焕庸线研究院,四川 成都 610059
  • 收稿日期:2024-04-29 出版日期:2024-08-18 发布日期:2024-09-25
  • 作者简介:戴晓爱(1979年生),女,教授,博士,主要从事生态环境监测与评价、生态系统服务等方面的教学和研究工作。E-mail: daixiaoa@cdut.edu.cn
  • 基金资助:
    国家自然科学基金项目(42271405);四川省重点研发项目(2023YFS0435);地质灾害防治与地质环境保护国家重点实验室自主研究课题(SKLGP2022Z007);成都理工大学研究生质量工程项目(2023YKC201);教育部产学合作协同育人项目(220802313174310);教育部产学合作协同育人项目(22073776112419);四川省线上线下混合式一流课程《地图学》(YLKC01430);雅鲁藏布江中游自然资源西藏自治区野外科学观测研究站开放基金项目(2024YJZKF005)

Spatio-temporal Dynamics and Attribution Analysis of Vegetation in Gansu Province

DAI Xiaoai1,2,3(), MA Jiaxin2, TANG Yiling2, LI Weile1   

  1. 1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu 610059, P. R. China
    2. School of Geography and Planning, Chengdu University of Technology, Chengdu 610059, P. R. China
    3. Digital Hu Huanyong Line Research Institute, Chengdu University of Technology, Chengdu 610059, P. R. China
  • Received:2024-04-29 Online:2024-08-18 Published:2024-09-25

摘要:

甘肃省作为中国西部生态安全屏障的重要组成部分,其植被覆盖变化直接关系中国西部的生态安全。采用2000-2020年植被覆盖度(FVC)数据,并从自然和人文影响方面选取16个影响因子,涵盖气候、地形地貌、土壤、人类活动,利用趋势分析法、地理探测器模型和偏最小二乘结构方程建模(PLS-SEM),从甘肃省不同干湿区、不同时间节点的角度探究其植被覆盖的变化特征及驱动力。结果表明,1)2000-2020年,甘肃省FVC整体持续改善,高植被覆盖度显著增加,其中陇东高原、陇中高原和疏勒河南部地区改善最为明显。2)不同干湿区的植被覆盖变化差异显著。干旱和半干旱区植被改善较慢,受降水量波动和土地利用方式影响大;而半湿润和湿润区植被改善明显,得益于良好的气候条件、生态工程的推动以及土壤有机碳含量的增加。3)降水和土地利用对FVC解释力最大,“退耕还林工程”对FVC的增加起到积极作用,但不合理的土地利用和城市化等也引起植被退化。随着时间推移,气候对FVC的影响一直在积极增加,不合理人类活动对FVC的负面影响相对稳定且较大,部分抵消了退耕还林的正面效果。此外,土壤有机碳含量对FVC的影响显著下降,且间接受到气候的正向影响。4)利用PLS-SEM模型,可有效分离自然与人为因素对植被覆盖的驱动作用,也可探究因素间的作用强度与途径。该研究增强了对区域植被动态变化规律的理解,也为生态恢复和环境管理提供了科学支持。

关键词: 植被覆盖度, 偏最小二乘结构方程, 驱动因子, 干湿区, 地理探测器, 人类活动

Abstract:

Gansu Province, as a crucial component of the national ecological security barrier in Western China, has experienced significant vegetation cover changes in recent years that are directly related to ecosystem restoration and environmental protection. Fractional Vegetation Cover (FVC) data from 2000 to 2020 were used, with 16 influencing factors selected from both natural and anthropogenic aspects, including climate, topography, soil, and human activity. Trend analysis, geodetection, and partial least squares structural equation modeling (PLS-SEM) were applied to explore the dynamics and drivers of vegetation cover changes across different arid and humid regions and temporal periods in Gansu Province. The results indicate that: 1) from 2000 to 2020, the Fractional Vegetation Cover (FVC) in Gansu Province exhibited a continuous overall improvement, with a significant increase in areas with high vegetation cover. Notably, the most pronounced improvements were observed in the Longdong Plateau, Longzhong Plateau, and the southern areas of the Shule River. 2) This period also highlighted significant spatial variations in vegetation cover across zones with different moisture conditions. Arid and semi-arid areas showed relatively slower vegetation improvements than other areas, which were heavily influenced by fluctuations in precipitation and land-use practices. In contrast, the semi-humid and humid zones represented significant improvements in vegetation cover, benefiting from favorable climatic conditions, proactive ecological projects, and increased in soil organic carbon content. 3) Precipitation and land use changes emerged as the primary explanatory variables for FVC, and reforestation projects actively contributed to the increase in vegetation cover. However, unsustainable land use and urbanization processes have led to vegetation degradation. Over time, the influence of climate on FVC has become increasingly positive, whereas the negative impact of unreasonable human activities on FVC remains relatively stable and significant, partially offsetting the positive effects of grain for green programs. In addition, the effect of soil organic carbon content on FVC declined significantly and was indirectly positively affected by climate. 4) Utilizing the Partial Least Squares Structural Equation Modeling (PLS-SEM) framework, this study effectively delineates the driving roles of natural and anthropogenic factors on vegetation cover and explores the strengths and pathways of these interactions between natural factors, anthropogenic factors, and vegetation cover. Comprehensive analysis of vegetation cover changes in Gansu Province not only enhances the understanding of regional vegetation dynamics, but also provides scientific support for ecological restoration and environmental management initiatives.

Key words: FVC, PLS-SEM, driving factors, arid and humid regions, geodetector, anthropogenic activity

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