漓江中上游小流域土壤和底泥氮磷含量分布

DISTRIBUTION OF NITROGEN AND PHOSPHORUS IN SOIL AND SEDIMENT OF SMALL WATERSHEDS IN THE UPPER AND MIDDLE REACHES OF LIJIANG RIVER

为分析漓江中上游土壤化学性质的差异,选取相对独立的两个小流域,即漓江中游的会仙试区和漓江上游的金龟河试区,对比分析两个试区土壤和底泥的pH、有机质、总氮、总磷4个指标。结果表明:1)漓江中上游两个小流域土壤和底泥氮、磷含量无显著差异;2)会仙试区土壤氮、磷平均含量分别为1.9,0.76 g/kg,金龟河试区土壤的氮、磷平均含量分别为2.54,0.52 g/kg,均处于较高水平,氮、磷易流失从而造成水体污染,存在一定环境风险。

In order to analyze the differences of soil chemical properties in the middle and upper reaches of the Lijiang River, two relatively independent small watersheds in the Lijiang River were selected to determine the pH value, organic matter, total nitrogen and total phosphorus content in the soil and sediment. The two small watersheds were the Huixian experimental area in the middle reach of Lijiang River, and the Jingui River experimental area in the upper reach. The results showed that: 1) there was no significant difference between the nitrogen and phosphorus contents in the soil and sediment of the two watersheds;2) that the average nitrogen and phosphorus contents in the soil of Huixian experimental area were 1.9, 0.76 g/kg respectively, and that in Jingui River experimental area were 2.54, 0.52 g/kg respectively, and the nitrogen and phosphorus contents in both of the two small watersheds maintained at a high level, and that would easily lead to nutrient losses and water pollution since nitrogen and phosphorus were easy to be washed away, thus there was a certain environmental risk.