长期施有机肥对耕地棕壤团聚体及钙素分布的影响

发布时间：2018-10-09 07:37

【摘要】：为了探明施有机肥对耕地棕壤团聚体及钙素分布的影响,以长期定位施肥近30年的耕地棕壤为研究对象,采用干筛法进行土壤团聚体分级,系统研究了单施有机肥及有机肥配施氮磷肥对耕地棕壤团聚体及不同形态钙素分布的影响。结果表明:与不施肥对照相比,施有机肥可增加1~2mm粒级团聚体含量,且随有机肥施入量的增加而增加,最高增加了66.68%;与单施有机肥相比,配施氮磷肥则降低了1~2mm粒级团聚体含量;与对照相比,单施及配施有机肥均降低了0.25~1 mm粒级团聚体含量,降幅最高达15.20%。单施及配施有机肥均提高了全土的全钙含量,其中单施高于配施,最高为施高量有机肥处理,增幅达11.67%;单施有机肥处理以1~2 mm粒级团聚体的全钙含量最高,配施氮磷肥后以0.053~0.25mm的最高;与对照相比,单施及配施有机肥均增加了各粒级团聚体水溶性钙含量;单施有机肥提高了土壤交换性钙含量,配施氮磷肥却相反;单施及配施有机肥处理均增加了全土酸溶性钙含量。相关性分析显示,耕地棕壤各级团聚体的全钙含量是影响各形态钙素分布的重要因素。因此,长期施有机肥不仅增加了耕地棕壤较大粒级团聚体含量,且可增加较大粒级团聚体的钙素含量。
[Abstract]:In order to find out the effect of organic fertilizer application on the aggregate and calcium distribution of cultivated brown soil, the soil aggregates were classified by dry sieve method. The effects of organic fertilizer and organic fertilizer combined with nitrogen and phosphorus on aggregate and calcium distribution in brown soil were studied systematically. The results showed that compared with the control, organic fertilizer could increase the content of 1~2mm aggregates, and increase with the increase of the amount of organic fertilizer, the highest increase was 66.68, compared with the single application of organic fertilizer. Application of nitrogen and phosphorus reduced the content of 1~2mm aggregates, compared with the control, the content of 0.25n-1 mm aggregates was decreased by applying organic fertilizer alone and by 15.20g / kg respectively. The total calcium content of the whole soil was increased by single application and combined application of organic fertilizer, in which the single application was higher than the combined application, the highest was the high amount of organic fertilizer treatment, the increase was 11.67%, and the content of total calcium in the single organic fertilizer treatment was the highest in the 1 ~ 2 mm aggregate. Compared with the control, the content of water-soluble calcium in the aggregates was increased by applying organic fertilizer alone, but the content of exchangeable calcium in soil was increased by applying organic fertilizer alone, while that by applying nitrogen and phosphorus fertilizer was opposite. The acid soluble calcium content of the whole soil was increased by applying organic fertilizer alone and in combination. The correlation analysis showed that the total calcium content of the aggregates in brown soil was an important factor affecting the distribution of calcium. Therefore, long-term application of organic fertilizer not only increased the content of larger grain-grade aggregates in brown soil, but also increased the content of calcium in larger grain-grade aggregates.
【作者单位】：沈阳农业大学土地与环境学院;
【基金】：国家自然科学基金项目(41401323) 辽宁省自然科学基金项目(2014027010)
【分类号】：S158

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