综合现有文献研究成果, 基于元数据分析方法研究不同植被的适宜、极限生态地下水位埋深。选择乔木、灌木 和草本等 3 种植被类型中的 13 种植物, 分析适宜、极限生态地下水位埋深的统计分布、生物多样性和丰富度指数, 推求生态地下水位埋深与植物根系和土壤质地的关系, 得出: 西北地区适宜和极限生态地下水位埋深均值分别为 2. 9、5. 5 m, 控制范围分别为 2. 3~ 3. 9、4. 0~ 7. 2 m; 适宜、极限生态地下水位埋深与植物根系具有显著的相关关系, 适宜生态地下水位埋深还取决于植物根系伸展速率与地下水位埋深下降速率的相对关系; 土壤质地控制毛细管上升高度及地下水位埋深以上水分供给能力, 是确定生态地下水位埋深的重要因子。

A meta-analysis was conducted based on the existing literature dataset. The dataset includes thirteen kinds of plants and three ty pes of vegetations ( arbor, shrub, herbal) . We identified the relationship between groundwater table depth and species diversity, species richness, and root depth with soil texture. The results showed that: the ecological depth to the groundwater table is quietly the same in different methods; the suit able ecological depth to the groundwater table is 2. 9 m, and the intimidating ecological depth to the groundwater table is 5. 5 m, respectively, while the fluctuation range is 2. 3~ 3. 9, 4. 0~ 7. 2 m; the suitable and intimidated ecological depth to groundwater table both have a typical correlation with root depth; based on current research, the relationship between the rate of root growth and decline of groundwater table depth determines the status of plant growth. The soil texture control capillary rise and groundwater supply capacity, which is an important factor of ecological depth to the groundwater table.

国家重点研发计划( 2017YFC0406101)