百花湖入库河流麦西河河口消落带土壤磷形态及其分布特征研究

应用磷形态标准测定方法（SMT）对百花湖（水库）入库河流麦西河河口消落带土壤不同形态的磷进行了分级测定，分析了各形态磷及与有机质、pH之间的相关性。结果表明：消落带A区(岸边土壤)总磷含量平均为1 298.8 mg/kg，B区(交界面土壤)平均为1 1712 mg/kg，C区(淹没区土壤)平均为1 0762 mg/kg。各种形态的磷在消落带分布特点不同：（1）各点OP含量A区>B区>C区，OP/TP的平均值为592%、607%、633%；（2）各点IP以Fe/Al P为主，消落带A区Fe/Al P占无机磷的比例平均为789%，B区为642%，而C区则为546%；（3）Ca P含量C区（1017 mg/kg）>B区（849 mg/kg）>A区（621 mg/kg）；（4）消落带A区土壤中活性磷组份（OP+Fe/Al P）占TP百分数为738%，B区为744%，C区为771%。消落带土壤活性磷组份较高，在适宜的条件下容易引起水体的二次污染，加快水体富营养化的进程

PHOSPHORUS FORMS AND ITS DISTRIBUTION CHARACTERISTICS IN SOILS OF WATER-LEVEL-FLUCTUATING ZONE AT THE ESTUARY OF THE MAIXI RIVER, INPUT RIVER OF THE BAIHUA RESERVOIR

The contents of different phosphorus forms in soils of water level fluctuating zone at the estuary of the Maixi river，a tributary of the Baihua Reservoir,were studied using the standard measurement and test (SMT) procedure of phosphorus forms．Correlation coefficient between phosphorus forms and organic matter and pH was analyzed．The results indicated that the total phosphorus (TP) average contents in the soils of A zone was 1 2988 mg/kg， 1 1712 mg/kg in soils of B zone and 1 0762 mg/kg in soils of C zone．The TP content in the soils of A zone was the highest，and the soils of C zone was the lowest．Distribution characteristics of phosphorus forms were different between the soils of A zone，B zone and C zone.The ratio of OP/TP in the C zone (average value 633%) was higher than that in the soils of B zone(average value 607%)，and that in the soils of A zone(average value 592%) was the lowest.The dominant phosphorus forms of IP was Fe/Al P．The average ratio of Fe/Al P /IP was 789%in the A zone,was 642% in B zone, and 54.6% in C zone．The Ca P average content in C zone was 1011 mg/kg,which was higher than that in soils of B zone (average content 849 mg/kg) and A zone (621 mg/kg).The average ratio of active phosphorus (OP+ Fe/Al-P) in TP was 738% in soils of A zone and 744% in soils of B zone, whereas the average ratio in soils of C zone was 771%．The active phosphorus would become potential pollution sources of water under appropriate environmental condition，therefore，the potential impact of phosphorus on water eutrophication in soils of water level fluctuating zone could not be neglected