浙江省滨海平原土壤中微量元素随利用时间的演变研究

Evolution of Soil Trace Elements with Utilization Time in Coastal Plain in Zhejiang Province

为了解滨海平原耕地土壤中微量元素的变化特征,在浙北和浙南分别建立不同围垦利用时间的土壤系列,采集不同围垦利用时间的表层土壤混合样和剖面分层土样,分析土壤基本性状和微量元素全量与有效态含量。结果表明:围垦利用时间对微量元素有很大的影响,随着围垦利用时间的增加,土壤中铜、锌含量呈现增加,而铁、锰、硼、钼含量呈现下降;有效态铜、锌、铁、锰都呈现明显的增加,而有效态硼、钼含量呈现明显的下降;围垦时间的增长也增加了上下层土壤之间微量元素含量的差异,土壤剖面由上至下铜、锌和钼含量呈现下降,而铁、锰和硼呈现出向中下层增加的变化。围垦利用时间对微量元素的影响主要是土壤基本性状发生变化、长期种植水稻发生淋溶作用等综合作用的结果。

To understand the changing characteristics of trace elements in cultivated soils of the coastal plain,soil chronosequence with different reclamation and utilization time was established in northern and southern Zhejiang, and both mixed surface soil samples and soil profile horizon samples with different reclamation and utilization time were collected to analyze the basic properties of the soils and the total and available contents of soil trace elements. The results show that reclamation and utilization time has great influence on the contents of trace elements. With the increase of reclamation and utilization time, the contents of copper and zinc in the soil increase, while the contents of soil iron, manganese, boron and molybdenum decrease. The contents of available copper, zinc, iron and manganese increase significantly, while the contents of available boron and molybdenum decrease significantly. The increase of reclamation and utilization time could also enlarge the difference of the contents of trace elements between upper and lower soil layers. The contents of copper, zinc and molybdenum decrease from top to bottom, while the contents of iron, manganese and boron increase from top to bottom. The effects of reclamation and utilization time on soil trace elements are mainly due to the changes of basic soil properties and the leaching effect of long-term rice planting.