-
摘要: 生态植被的地下水阈值是指植被依赖地下水生长的最大水位埋深和溶解性总固体含量（TDS）。控制地下水开采生态风险的基础是弄清生态植被与地下水的依存关系并给出地下水阈值。文章利用遥感数据集MOD13Q1和水文地质调查获得的实测数据，统计分析了柴达木盆地主要平原区生态植被与潜水的水位埋深、TDS的关系。结果表明：天然植被依赖地下水的阈值是水位埋深为5.3 m、TDS为7.5 g/L；埋深＞5.3 m地带的天然植被基本与地下水无关；埋深＜1.1 m是水生植被、湿生植被与湿生耐盐碱植被适宜生长的水位埋深区间；埋深1.4~3.5 m是耐盐植被及中生植被与旱生植被适合生长的水位埋深区间；TDS≤1.5 g/L适宜植被生长，1.5 g/L＜TDS≤5 g/L较适宜植被生长，5 g/L＜TDS≤7.5 g/L基本不适宜植被生长，TDS＞7.5 g/L不适宜植被生长。Abstract: The groundwater threshold of ecological vegetation is defined as the maximum depth to the water table and the maximum total dissolved solids (TDS) of groundwater on which the growth of vegetation depends. The basis for controlling the ecological risk of groundwater exploitation is to clarify the dependency of ecological vegetation and groundwater and determine the groundwater threshold. Based on the measured data obtained by remote sensing dataset MOD13Q1 and hydrogeological survey, the relationship among ecological vegetation, burial depth and TDS of the phreatic water in the main plain area of the Qaidam Basin is statistically analyzed. The results show that ① the threshold of natural vegetation-dependent groundwater is 5.3 m for depth of water table and 7.5 g/L for TDS, and natural vegetation growing in areas where the water table depth is more than 5.3 m is basically independent of groundwater. ② Water table depth ＜1.1 m is suitable for aquatic, hygrophilous vegetation and hygrophilous saline-resistant vegetation. Water table depth ranging from 1.4 m to 3.5 m is suitable for saline-resistant vegetation, middle vegetation and xerophytic vegetation. ③ TDS of ≤1.5 g/L is suitable for vegetation growth, 1.5 g/L7.5 g/L is not suitable for vegetation growth.
-
Key words:
- Qaidam Basin /
- ecological vegetation /
- groundwater threshold /
- groundwater depth /
- TDS
-
-
计量
- 文章访问数: 1025
- PDF下载数: 10
- 施引文献: 0
下载: