干旱区研究 ›› 2023, Vol. 40 ›› Issue (4): 623-635.doi: 10.13866/j.azr.2023.04.11

• 植物生态 • 上一篇    下一篇

基于地理探测器的河套灌区林草植被覆盖度时空变化与驱动力分析

李鑫磊1(),李瑞平1,2(),王秀青3,王思楠1,王成坤1   

  1. 1.内蒙古农业大学水利与土木建筑工程学院,内蒙古 呼和浩特 010018
    2.内蒙古自治区农牧业大数据研究与应用重点实验室,内蒙古 呼和浩特 010018
    3.内蒙古自治区测绘地理信息中心,内蒙古 呼和浩特 010050
  • 收稿日期:2022-05-24 修回日期:2022-11-25 出版日期:2023-04-15 发布日期:2023-04-28
  • 通讯作者: 李瑞平. E-mail: nmglrp@163.com
  • 作者简介:李鑫磊(1998-),男,硕士研究生,主要从事干旱区自然植被研究. E-mail: 1947977377@qq.com
  • 基金资助:
    国家自然科学基金项目(51839006);国家自然科学基金项目(52069021)

Spatiotemporal change and analysis of factors driving forest-grass vegetation coverage in Hetao Irrigation District based on geographical detector

LI Xinlei1(),LI Ruiping1,2(),WANG Xiuqing3,WANG Sinan1,WANG Chengkun1   

  1. 1. College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, Inner Mongolia, China
    2. Inner Mongolia Key Laboratory of Big Data Research and Application in Agriculture and Animal Husbandry, Hohhot 010018, Inner Mongolia, China
    3. Surveying, Mapping and Geographic Information Center of Inner Mongolia, Hohhot 010050, Inner Mongolia, China
  • Received:2022-05-24 Revised:2022-11-25 Online:2023-04-15 Published:2023-04-28

摘要:

基于2000—2019年的林草植被覆盖度数据分析了河套灌区近20 a的林草植被时空变化特征,并利用地理探测器定量分析了各驱动因子对林草植被覆盖的影响。结果表明:(1) 近20 a河套灌区林草地面积总体呈减少态势,减少量为966.15 km2,林草植被覆盖度等级整体呈上升趋势,多年平均林草植被覆盖度为28.3%,空间尺度上,河套灌区林草植被覆盖度呈现出东北向西南递减的空间变化特征;(2) 近20 a低林草植被覆盖度、中林草植被覆盖度等重心主要位于永济灌域东北侧和义长灌域西南侧,各级林草植被覆盖重心表现为从东北向西南方向递减,并均呈现出向西南方向迁移的态势,各时段迁移距离介于0.71~15.46 km;(3) 距水域距离、地下水埋深、气温、降水是影响区域内林草植被覆盖度的主导环境因子,且解释力分别为0.427、0.439、0.318、0.368;距水域距离、地下水埋深、年平均降水与其他因子的交互作用普遍较高,区域含水量的大小是影响河套灌区林草地生长状况的主要驱动力,研究结果可为灌区自然植被的保护与恢复提供相应的科学依据。

关键词: 河套灌区, 林草植被覆盖度, 时空变化, 驱动因子, 地理探测器

Abstract:

Based on the data on forest and grass vegetation coverage from 2000 to 2019, the spatiotemporal change of forest and grass vegetation in Hetao Irrigation District over 20 years was analyzed, and the influence of various factors driving forest and grass vegetation coverage was quantitatively analyzed using a geographical detector. The results showed the following: (1) The area of forest and grassland in Hetao Irrigation District showed a decreasing trend in the studied 20 years, with a decrease of 966.15 km2. The vegetation coverage level of forest and grassland showed an overall upward trend. The average annual vegetation coverage of forest and grassland was 28.3%. On the spatial scale, the vegetation coverage of forest and grassland in Hetao Irrigation District showed a spatial variation characteristic of decreasing from northeast to southwest. (2) In the studied 20 years, the centers of gravity of low forest and grass vegetation coverage and medium forest and grass vegetation coverage have mainly been located in the northeast of Yongji irrigation area and the southwest of Yichang irrigation area, respectively. The centers of gravity of forest and grass vegetation coverage at all levels show a decreasing trend from northeast to southwest, and all show a trend of migration to the southwest. The migration distance in each period was between 0.71 and 15.46 km. (3) Distance from water, groundwater depth, temperature, and precipitation are the dominant environmental factors affecting the forest and grass vegetation coverage in the region, with explanatory power of 0.427, 0.439, 0.318, and 0.368, respectively. The interaction between distance from water, groundwater depth, annual average precipitation, and other factors is generally higher, and the regional water content is the main driving force affecting the growth of forest and grassland in Hetao Irrigation District.

Key words: Hetao Irrigation District, vegetation coverage, spatiotemporal change, driving factor, geographical detector