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以长期施肥的旱地红壤为材料,研究了单施无机肥、有机-无机配施两种途径下,红壤的磷库储量及其供磷能力的动态变化。结果表明:两种培肥途径均可以稳定并提高红壤全磷和有效磷含量,化学磷肥的合理施用可在4~5a内重建红壤磷库,使之达到磷素肥沃水平(Olsen-P约为20mgkg-1),而配施猪厩肥只需2a时间,配施花生秸秆的效果不显著。两种培肥途径均可以提高红壤中各形态无机磷含量,尤其是可以显著增加最有效的Al-P含量,从而大大增强了红壤的供磷能力。当红壤磷素的自然供给能力降至最低时,如NK处理的全磷量小于0.3gkg-1时,土壤中所有不同形态的磷(包括Olsen-P)都可视为无效或者说土壤无有效供磷能力。
Taking the long-term fertilized red soil of dry land as the material, the dynamic changes of P store and availability of P in red soils were studied under single application of inorganic fertilizer and organic-inorganic combination. The results showed that both ways of fertilizing could stabilize and increase the contents of total phosphorus and available phosphorus in red soils. Reasonable application of chemical fertilizers could rebuild the red phosphorus soils within 4 ~ 5 years to reach the level of phosphorus fertilization (Olsen-P is about 20mgkg-1), but with pig manure just 2a time, with straw peanut effect is not significant. Both ways of fertilizing could increase inorganic phosphorus content of all forms of red soil, especially significantly increase the content of Al-P, which greatly enhanced the phosphorus supply ability of red soil. When the natural supply of phosphorus in red soil is minimized, all forms of phosphorus (including Olsen-P) in the soil can be regarded as ineffective or the soil is not effective if the total phosphorus content of NK treatment is less than 0.3gkg-1 Phosphorus capacity.