img

官方微信

高级检索

中国沙漠 ›› 2024, Vol. 44 ›› Issue (3): 119-127.DOI: 10.7522/j.issn.1000-694X.2023.00180

• • 上一篇    

20002020年河西内陆河流域植被覆盖时空变化特征及其驱动力

申子傲(), 吴静(), 李纯斌   

  1. 甘肃农业大学 资源与环境学院,甘肃 兰州 730070
  • 收稿日期:2023-11-13 修回日期:2023-12-15 出版日期:2024-05-20 发布日期:2024-06-11
  • 通讯作者: 吴静
  • 作者简介:吴静(E-mail: wujing@gsau.edu.cn
    申子傲(1999—),女,湖北荆门人,硕士研究生,研究方向为生态遥感。E-mail: 944066898@qq.com
  • 基金资助:
    国家自然科学基金地区基金项目(31760693);甘肃省科技计划项目(22JR5RA851)

Temporal and spatial changes of vegetation cover and its driving forces in the Hexi inland river basin from 2000 to 2020

Ziao Shen(), Jing Wu(), Chunbin Li   

  1. College of Resources and Environmental Sciences,Gansu Agricultural University,Lanzhou 730070,China
  • Received:2023-11-13 Revised:2023-12-15 Online:2024-05-20 Published:2024-06-11
  • Contact: Jing Wu

摘要:

河西内陆河流域地处干旱半干旱地区,生态脆弱,研究植被覆盖动态变化及其驱动因素对理解植被与生态系统的相互作用具有重要意义。采用生长季平均归一化植被指数(NDVI)作为植被覆盖指标,利用Slope趋势分析和变异系数对2000—2020年河西内陆河流域植被覆盖变化进行分析,并结合地理探测器模型探讨了自然因子和人为因子对植被空间分异的影响。结果表明:(1)2000—2020年河西内陆河流域植被覆盖总体呈现波动上升趋势,NDVI年增长速率为0.001,呈西北低东南高、由东向西递减的空间分布特征。(2)2000—2020年流域内大部分区域植被覆盖基本不变,植被覆盖增加的区域占比35.27%,植被覆盖减少的区域占比10.91%。(3)河西内陆河流域植被覆盖时空变异性强,变异系数为0.011~1.530,大部分地区变化表现为高稳定性,低稳定性区域主要集中在流域中上游地区。(4)驱动因素中自然因素占主导地位,蒸散发量、植被类型、降水量、土壤类型影响力较大,人为因素中土地利用类型为主要影响因素。

关键词: 河西内陆河流域, 植被覆盖, 地理探测器, 驱动因子, 时空变化

Abstract:

The Hexi inland river basin is located in arid and semi-arid regions with fragile ecosystems, and there is significant importance in studying the dynamic changes in vegetation cover and its driving factors for understanding the interaction between vegetation and ecosystems. This study uses the mean NDVI during the growing season as the vegetation cover index, employs slope trend analysis and coefficient of variation to analyze the changes in vegetation cover in the Hexi inland river basin from 2000 to 2020, and explores the effects of natural and anthropogenic factors on the spatial differentiation of vegetation using the Geodetector model. The results indicate that: (1) During 2000-2020, the vegetation cover in the Hexi inland river basin exhibited a generally rising trend with fluctuations, having a growth rate of 0.001·a-1, characterized by a spatial distribution of lower in the northwest and higher in the southeast, decreasing from east to west. (2) Between 2000 and 2020, in most parts of the basin, the vegetation cover remained relatively constant. The areas with increased vegetation cover constituted 35.27% and those with decreased cover constituted 10.91%. (3) The Hexi inland river basin exhibits strong spatiotemporal variability in vegetation cover, with the coefficient of variation ranging from 0.011 to 1.530. The majority of regions demonstrate high stability, with low stability areas primarily focused in the middle and upper reaches of the basin. (4) Natural factors play a leading role, with substantial impacts from evapotranspiration, vegetation types, precipitation, and soil types. Among human factors, land use type emerges as a primary influencer. Revealing the long-term vegetation evolution patterns and characteristics in the Hexi inland river basin offers valuable insights for ecological preservation and soil and water conservation in the region.

Key words: Hexi inland river basin, vegetation cover, geodetector, driving factors, spatiotemporal variation

中图分类号: