总目录
王彩绒,胡正义,杨林章,高义民,吕家珑.太湖典型地区蔬菜地土壤磷素淋失风险[J].环境科学学报,2005,25(1):76-80
太湖典型地区蔬菜地土壤磷素淋失风险
- Risk of phosphate leaching loss from soil of vegetable plot in the typical region of Taihu Lake
- 基金项目：科技部"863"项目(2002AA601012)
- 作者
- 单位
- 王彩绒
- 1. 中国科学院南京土壤研究所 土壤与持续农业国家重点实验室, 南京 210008; 2. 西北农林科技大学 资源环境学院, 杨凌 712100
- 胡正义
- 中国科学院南京土壤研究所 土壤与持续农业国家重点实验室, 南京 210008
- 杨林章
- 中国科学院南京土壤研究所 土壤与持续农业国家重点实验室, 南京 210008
- 高义民
- 西北农林科技大学 资源环境学院, 杨凌 712100
- 吕家珑
- 西北农林科技大学 资源环境学院, 杨凌 712100
- 摘要：以太湖典型地区宜兴市大浦镇湖滨公路以东沿太湖50hm2老蔬菜基地为研究对象,采用网格法(50m×50m)采集表层(00cm)土壤样品156个.地统计学分析表明:土壤P(全P、Bray-P、CaCl2浸提水溶P)呈明显空间变异,土壤高P区出现在朱渎港、林庄港两村庄附近.土壤Bray-P低于60mg·kg-1,几乎没有检测到CaCl2浸提水溶P,而当土壤速效P大于60mg·kg-1后,CaCl2浸提水溶P随Bray-P增加而直线增加.以土壤Bray-P含量60mg·kg-1为研究地土壤发生P淋溶的临界值,研究范围内土壤发生P淋溶面积占总调查面积28%.针对目前土壤状况,提出控制蔬菜地P淋溶对策.
- Abstract：In this investigation, 156 top layer soil samples (0～20 cm) were taken in a regular grid of 50 m by 50 m at 50 hm2 area of vegetable plot located at the east part of Taihu road in Dapu town, Yixing city. Geo-statistics analysis of these data demonstrated that spatial variability of soil total P, Bray-P, CaCl2 extractable Pwere obvious, and the high-Pfields appeared at the shores of Zhudu, and Linzhuang harbors. The CaCl2 extractable Pwas very little from soils below 60mg·kg-1 Bray-P (termed the Change-Point), however, CaCl2 extractable Pwas linearly related to the soil Bray-P. When above the Change-Point we therefore suggested that the Change-Point of around 60 mg·kg-1 Bray-Pwas a critical concentration at which leaching of Phappened in vegetable soil. About 28% of the investigation area were at, or above, the Change-Point of 60mg·kg-1 Bray-P, and had a risk of Pleaching loss from soil to water. Some controlling measures of leaching loss of Pto water were also recommended.
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