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本文研究了三种水稻土(黄泥土、棕壤型、草甸型)的肥力性状。所得结果与旱田土壤比较有如下一些不同之点:(1)土壤腐殖质缩合作用较弱;(2)<10微米各级微团聚体的量减少;(3)微团聚体中C,N,P含量变化随粒径增大而缓慢地减少;(4)微团聚体对NH_(?)和P的吸附和解吸附量较高;(5)土壤的贮水能力较高,渗水能力则较差。测验证明,在腐殖质含量较多的草甸土型水稻土和旱田土壤都是以<10微米的各级微团聚体为影响肥力的主要部分,而含腐殖质较少的棕壤型水稻土和旱田土壤都是以>10微米各级微团聚体为影响肥力的主要部分。
This paper studied the fertility traits of three paddy soils (yellow soil, brown soil type and meadow type). The results obtained were compared with those of dryland soil with the following differences: (1) weak soil humus condensation; (2) the amount of microaggregates at <10 μm decreased; and (3) C, N and P in microaggregates (4) The microaggregates have higher adsorption and desorption amounts of NH_ (?) And P; (5) The soil has higher water storage capacity and less water seepage ability. Tests showed that in the meadow soil paddy soil and dry soil soil with more humus content, the micro-aggregates at all levels <10 μm were the main parts that affected the fertility, while the brown soil type paddy soil with less humus and dry soil Soil is all micro-aggregates> 10 microns as the main part of fertility.