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以浙江省慈溪市三个代表性时期(宋代,明代,近代)围海造田水稻田土壤为研究对象,每个时期采二个土壤剖面,室内分析土壤肥力参数(有机质、总氮、总磷、总钾、速效磷、速效钾、pH),研究不同时期围海造田土壤肥力剖面分布(0～100cm)特征及其水稻种植时间对土壤肥力的影响。结果表明,不同时期围海造田水稻田土壤剖面全钾含量均随剖面深度增加而增大;土壤全钾含量随着水稻种植时间的延长而增大。建议采用水稻与深根作物轮作,利用底土层土壤钾素。随着水稻土利用年限的增长,磷素在土壤表层富集加聚,因此,稻田磷输出对水体富营养化影响值得关注。
Taking three paddy soils around the sea in Song Dynasty, Ming Dynasty and Modern China as study objects, two soil profiles were collected in each period. Soil fertility parameters (organic matter, total nitrogen, total phosphorus, Total potassium, available phosphorus, available potassium and pH) were used to study the characteristics of soil fertility profile (0 ~ 100cm) and the effect of rice planting time on soil fertility in different periods. The results showed that the total potassium content in the soil profiles of paddy field in different periods increased with the increase of profile depth. The content of total potassium in soil increased with the prolongation of rice planting time. It is recommended to use rice and deep-root crop rotations to make use of soil subsoil potassium. With the increase of the useful life of paddy soils, phosphorus enrichment and enrichment in the surface layer of soils, so the impact of phosphorus output on the eutrophication of paddy fields deserves attention.