黄河三角洲贝壳堤土壤水潜在水源研究

Potential Water Source of Soil Water in the Chenier of Yellow River Delta

通过分析黄河三角洲贝壳堤4处采样地0~80 cm深度土壤p H、含盐量、含水量和氢、氧稳定同位素垂直分布特征,研究黄河三角洲贝壳堤土壤水的潜在水源,为该区植物恢复提供理论依据。研究结果表明,各采样地的土壤p H都偏碱性,滩脊采样地的土壤p H高于其它采样地;向陆侧采样地的土壤含盐量最高,滩涂采样地的次之,向海侧和滩脊采样地的较低;随着土壤深度的增加,各采样地的土壤含水量都波动增大,滩涂和向陆侧采样地土壤含水量高于向海侧和滩脊处采样地。随着土壤深度的增加,滩涂、滩脊和向海侧采样地土壤水的δD值和δ18O值波动减小。在向陆侧采样地,积水通过入渗补给了0~40 cm深度的土壤水,而60~80 cm的深层土壤水则受到海水补给;海水对滩涂、向海侧和滩脊采样地的60~80 cm深度土壤水有一定的补给作用。

The potential water source of soil water in the chenier of Yellow River Delta was revealed by analyzing the vertical distribution characteristics of the p H, salinity, moisture and stable hydrogen and oxygen isotopic in the soils of 0-80 cm depth at four sampling sites, which would provide theoretical basis for the study of vegetation restoration. The results showed that the soil p H at the sampling sites was alkaline and the soil p H at the beach ridge site was much higher than those of other sampling sites. The salinity in the soils of the landward side site was the highest, while those in the beach, seaside beach and beach ridge sites were much lower. With the soil depth increasing, the soil moisture generally increased at 4 sampling sites, and the soil moisture at the beach and the landward side sites were much higher than those at seaside beach and beach ridge sites. With the soil depth increasing, the δD and δ^18 O values in the soil waters of the beach, beach ridge and seaward side sampling sites gradually decreased. At the landward side site, the water on the soil showed a supply for the soil water of 0-40 cm depth by infiltration but the soil water of 60-80 cm depth was supplied by seawater. In addition, seawater showed a certain supply for the soil water of 60-80 cm depth in the beach,seaside and beach ridge sites.