长期施肥下不同种植年限碱化草甸土水稳性团聚体及有机碳分布

Distribution of Carbon and Water Stable Aggregates on Different Planting Years with Long-term Fertilization in Meadow Alkaline Soil

以松嫩平原碱化草甸土为研究对象，通过长期施用有机肥，对不同种植年限碱化草甸土水稳性团聚体及有机碳的粒径分布特征进行了研究。结果表明，随着种植年限的增加，土壤较大粒级水稳性团聚体（〉1mm）含量减少，而0．25～0．5mm粒级水稳性团聚体含量明显增加；随种植年限的增加，各粒级碱化草甸土有机碳平均含量呈增加趋势。2～5mm粒级土壤有机碳平均含量最高，随粒级的减小，有机碳含量逐渐减少，0．25～0．5mm粒级水稳性团聚体含量与有机碳含量呈现显著正相关关系；种植4a后，碱化草甸土土壤水稳性团聚体及有机碳含量开始呈现稳中有升的趋势。

Meadow alkaline soil was taken as research object in Songnen plain. Water-stable aggregates and carbon distribution in meadow alkaline soil were studied through long-term fertilization of manure. The re- suits indicated that the larger water-stable aggregate content（〉1mm） was decreased with planting years in- creasing by long-term fertilization of manure, but 0.25-0.5 rnm water-stable aggregates was increased sig- nificantly. The soil organic carbon（SOC） contents were increased in various size with planting years increas- ing, SOC contents in size of 2-5 mm were highest, and SOC contents decreased with size decreasing. Using correlation analysis, 0. 25 -0. 5 mm water-stable aggregates were significantly related to SOC contents. Water-stable aggregates and SOC contents in meadow alkaline soil slightly increased after continuous 4-year planting.