修复后临汾湿地公园土壤养分状况及沉积物污染特征

为探究汾河临汾段湿地土壤及沉积物的理化性质、养分含量,评价土壤状况、预测水体的生态环境质量。共采集98个土壤及沉积物样本,分析了理化性质及养分等11项指标。结果表明:土壤pH在7.0~8.4,容重在1.04~1.44 g/cm^3,含水率在5.9%~17.5%,电导率在0.167~0.747 mS/cm,质地类型包括壤黏土和黏壤土;有机质、全氮、全磷含量分别为8.7~39.8,0.354~1.046,0.389~1.444 g/kg,碱解氮、速效磷、速效钾含量分别为12.9~50.3,2.6~31.2,86.4~329.2 mg/kg。经相关性分析可知,土壤各指标与物理性质相关性较强;沉积物各指标与质地显著相关,且有机质、全氮、碱解氮、速效钾两两相关;养分评价中,有机质、全磷、速效磷处于4级水平,全氮在3~6级均有分布,碱解氮分布在5,6级,速效钾分布在2,3级;沉积物在有机污染评价中表现中度污染,综合污染评价表现重度污染。

Soil Nutrient Status and Sediment Pollution Characteristics of Linfen Wetland Park After Rehabilitation

The physiochemical properties and nutrient contents in wetland soils and sediments in the Linfen segment of Fenhe River were explored, the soil status was assessed, and the ecoenvironmental quality of water was predicted. Totally 98 samples of soils and sediments were collected, and 11 indices including physiochemical properties and nutrients were analyzed. It was found the soil pH was 7.0~8.4, bulk density was 1.04~1.44 g/cm³, water content was 5.9%~17.5%, conductivity was 0.167~0.747 mS/cm, and soil texture types included loam clay and clay loam. The contents of organic matter, total N, total P, alkali-hydrolyzable N, available P, and available K were 8.7~39.8, 0.354~1.046, 0.389~1.444 g/kg, 12.9~50.3, 2.6~31.2, and 86.4~329.2 mg/kg, respectively. Correlation analysis showed that the indices of soils and sediments were significantly correlated with physical properties and textures respectively. Moreover, organic matter, total N, alkali-hydrolyzable N, and available K were correlated pairwise. Nutrient evaluation showed organic matter, total P and available P were at grade 4, total N was within grade 3 and 6, alkali-hydrolyzable N was at grade 5 and 6, and available K was at grade 2 and 3. The organic pollution degree of sediments was assessed as moderate, and the comprehensive pollution degree was evaluated as severe.