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通过15年长期定位试验,采用Bowman和Cole提出的土壤有机磷分级方法,研究了不同耕作施肥措施对旱地耕层土壤有机磷及其组分的影响。结果显示旱地土壤各个处理的活性有机磷含量低,占有机磷总量的比例低于3.6%,中活性有机磷为有机磷的主体,约占有机磷总量的73.37%-91.54%。休闲、撂荒及磷肥与其它肥料配合使用,均增加了耕层土壤的中活性有机磷含量,增加了中稳性有机磷含量及其比重;休闲、撂荒及磷钾提高了高稳性有机磷含量及比重,而氮磷钾及其与有机肥配合处理则降低了高稳性有机磷的含量。尽管不同耕作施肥管理均影响旱地土壤有机磷含量,但是施用有机肥对有机磷的增加贡献最大;撂荒与休闲相比,前者更有利于土壤有机磷的积累。
Through 15-year long-term experiment, the soil organic phosphorus classification method proposed by Bowman and Cole was used to study the effects of different tillage practices on soil organic phosphorus and its components in dryland. The results showed that the content of active organic phosphorus in dryland soil was low, accounting for less than 3.6% of total organic phosphorus, and the active organic phosphorus was the main body of organic phosphorus, accounting for 73.37% -91.54% of total organic phosphorus. Leisure, wasteland and phosphate fertilizer combined with other fertilizers increased the content of active organic phosphorus in the topsoil and increased the content of mid-stable organic phosphorus and their specific gravity. Leisure, fallow and phosphorus and potassium increased the content of high-stable organic phosphorus And specific gravity, while NPK and its combination with organic manure decreased the content of high-stable organic phosphorus. Although different tillage and fertilization management affects the content of organic phosphorus in dry land, organic manure can contribute the most to the increase of organic phosphorus. Compared with leisure, fallow land use is more conducive to the accumulation of soil organic phosphorus.