摘要: 基于20002019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。
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.
| [V1] | 2023-05-30 18:34:10 | ChinaXiv:202305.00263V1 | 下载全文 |
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