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评价土壤肥力对剖析土壤生态系统十分必要。反映土壤肥力的可测指标很多,本文选择了有机质、速效磷、速效钾、代换量、耕层厚度、容重、非毛管孔隙、渗漏速度、粘粒含量、障碍层深度和旱季地下水位共11个指标,通过主组元分析对太湖地区5种水稻土的土壤肥力进行了评价。结果表明:侧渗水稻土的潜在肥力低,肥力有效度小;囊水水稻土潜在肥力高,但肥力有效性小;漏水水稻土有效肥力高,但潜在肥力低。同时,文中提出了相应的改良措施,为整个太湖地区水稻土的改良、培肥与利用提供了科学依据。
Evaluation of soil fertility is essential for the analysis of soil ecosystems. There are many measurable indicators to reflect soil fertility. In this paper, organic matter, available phosphorus, available potassium, substitution, thickness of tillage, bulk density, non-capillary pores, leakage rate, clay content, depth of barrier layer and groundwater level in dry season Eleven indicators were used to evaluate the soil fertility of five paddy soils in Taihu Lake region by principal component analysis. The results showed that the potential fertility of infiltration paddy soil was low and its fertility was low. The potential fertility of paddy soil was high, but its fertility was low. The effective fertility of paddy soil was high but its potential fertility was low. At the same time, the corresponding improvement measures are put forward in this paper, which provide a scientific basis for the improvement, fertilization and utilization of paddy soils in Taihu Lake.