不同利用方式下吴江市耕地土壤环境质量变化

土地利用方式的不同影响着土壤环境质量的变化。文章采用了2003年江苏省吴江市耕地质量监测中资料,分析了6种不同土地利用方式下的土壤养分及Pb、Cr、Hg、As、Cd等5种重金属元素全量的变化,并采用土壤质量综合指数(SQI)法计算不同利用下的土壤环境质量指数。结果表明:近20多年来,吴江市土地利用方式发生了明显的变化,这种变化对本土壤养分和重金属含量产生了十分明显的影响。在稻田、林地、桑园、菜地、果园、旱地六种吴江常见的土地利用方式中,稻田土壤环境质量综合指数显著高于其他利用下,而其他五种利用方式下土壤质量的差别不明显。可见稻田不仅是一种太湖地区传统的利用方式,更是保持环境质量相对最佳的土地利用方式。

Variation of soil quality with different land use change in Tai Lake region, Jiangsu, China: A case study of soil quality survey of Wujiang municipality in 2003

Land use have profound impacts on soil quality. In this paper, data of soil nutrients and Cd, Pb, Hg, As, Cr from the soil quality survey of Wujiang Municipality conducted in 2003 was analysed and a synthetic soil quality index was calculated for the soils under different land uses. The results showed that variation of soil quality associated with soil nutrients and heavy metals with the land use patterns had been apparent for the last 20 years Among the six major land use patterns, rice paddies were shown in better soil quality than under the other 5 land uses concerned with the contents of heavy metals and soil P, pH and SOC status. Therefore, rice paddies are not only a traditional land use for higher cereals production but also a land management practice for preserving high soil quality and environmental safety.