稻-鸭复合生态系统稻田土壤质量研究

通过田间试验对湿地稻-鸭复合生态系统的稻田土壤质量进行了研究。研究结果表明,与常规稻田相比,实行稻-鸭生态复合种养,其土壤有机质、全氮、碱解氮、速效磷、速效钾都有所增加,增加幅度分别为11.3～29.3%、3.0～15.1%、5.9～9.6%、3.8～9.7%、23.4～27.3%;土壤物理性状也得到一定程度地改善,土壤容重降低0.01gcm-3,>0 25mm团聚体增加2.65～3.12%,土壤结构系数增加2.56～6.63%;同时,稻田土壤氧化还原状况也得到了明显改善;而且由于土壤肥力的提高以及土壤通气状况的改善,也促进了水稻对N、P、K养分的吸收。

Paddy Soil Quality of a Wetland Rice - duck Complex Ecosystem

The quality of paddy soils in a wetland rice-duck complex ecosystem was studied by plot experiments. The results showed that, compared with conventional paddy fields, soil organic matter, total N, available N, available P, and available K increased by 11.3-29.3%, 3.0-15.1%, 5.9-9.6%, 3.8-9.7%, and 23.4-27.3% respectively in the rice-duck ecological system. The soil physical characteristics were also improved. Soil bulk density decreased by 0.01g cm~(-3). The >0.25mm soil aggregate and structure coefficient of soil increased by 2.65-3.12% and 2.56-6.63% respectively. Meanwhile, the redox status of soil was also markedly meliorated. Because of the and improvement of soil fertility aeration,the absorption of N, P, and K nutrients by rice plant was improved in same manner.