青土湖水面形成区土壤颗粒组成与化学特性变化

Changes on its chemical characteristics and soil particle composition after water formation in the Qingtu Lake

青土湖输水作为石羊河流域治理的一项关键措施,对保护湖区水资源和生态环境具有重要意义。在距青土湖水面边缘东南方向0-450 m的10个样点中分3层取0-60 cm土样,测定土壤粒径的质量百分比与全氮、全磷、全钾和电导率,分析青土湖水面形成后土壤颗粒组成与化学特性变化。结果表明,随着离水面边缘距离的增加,土壤颗粒与化学特性呈有规律的增减变化,土壤粘粉粒组成与其全磷、全钾之间存在正线性相关。青土湖水面形成加剧了距水面边缘0-150 m处的土壤理化性质变化;土壤细粒及养分出现富集,分别在距水面边缘100-150 m和300 m处达到最大值。因此,土壤养分与土壤细物质的良好相关性表明,土壤粘粉粒变化可作为反映该区域土壤性状变化和评价衡量水面形成后土壤恢复程度的定量指标之一。

Importing water to Qingtu Lake as a key measure, it has great significance to protect the water resources and ecological environment in the Shiyang River Basin. Stratified samples three soil layers of 0-60 cm in ten plots from 0 to 450 m of southeast water margin of Qingtu Lake were measured mass percentage of soil particle size and total nitrogen, total phosphorus, total potassium and conductivity, then soil particles composition and chemical properties change were analyzed after water formation of Qingtu Lake. The results showed that, with increasing distance from the margin of the water, soil particles and chemical properties showed regular changes of increasing or decreasing, and soil clay composition positively linear correlated to total potassium and total phosphorus. The soil properties changes were exacerbated in 0-150 m from the margin of the water. Soil fine and nutrients appeared enrichment and reached the extreme at 100-150 m and 300 m from the margin of the water. Therefore, the good correlation between soil nutrients and soil fine matter showed that the change of soil clay particles could be used as a quantitative index to reflect the change of soil properties and the degree of soil restoration after the water formation.