基于WET的中卫南山台子盐渍土分布特征研究

Study on distribution characteristics for salty soil in Zhongwei Nanshantaizi area based on WET

土壤盐渍化是一个世界性的生态问题和资源问题,给人类社会带来了严重的生态危害和经济损失。中卫南山台子属于扬黄灌区,土壤盐渍化危害不断加剧,甚至出现了部分农田荒芜现象,急需治理改良。本文分析了潜水位埋深、地质、水文地质条件等与土壤盐渍化的关系;同时,在宁夏首次应用WET土壤水分温度电导率速测仪(以下简称WET)测试了灌区土壤的电导率等参数,对盐渍土分布进行了评价。结果表明,研究区内黄河冲积平原区潜水埋深浅,TDS浓度整体呈现出西部地区大于东部地区;全盐量的分布情况也是西部地区整体高于东部地区。地下水位埋深浅,地下水TDS值高的区域土壤盐渍化严重。在黄河冲积平原南部边界及漫滩区部分区域全盐量较大,盐渍化较严重,属于中盐渍土,南山台子大部分属于非盐渍土。

Soil salinization is an ecological and resource issues worldwide which have brought serious ecological damage and economic loss. Nanshantaizi in Zhongwei is located in Yanghuang irrigation area. With the soil salinization becoming more and more severe and the farmland desertification appears, the improvement is urgent to be carried out. The paper analyzes the relationship between groundwater level, geology, hydrogeology and the soil salinization degree. Meanwhile, the WET soil moisture meter （hereinafter referred to as WET） is applied for the first time to determine the ECp etc. Zhongwei Nanshantaizi area and evaluate soil salinization distribution characteristics. The results show that in Nanshantazi area, the groundwater depth is quite low in the Yellow River alluvial plain, the concentration of TDS in west area is higher than that in east area, the salinity in the western area is also higher than that of the East. Soil salinization is much more serious in lower groundwater depth and high TDS areas. In the south border and the floodplain area of Yellow River alluvial plain, the TDS is higher and the soil salinization is more serious, which belongs to middle level salinized soil. Most part of the area is not salinized.