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土壤团聚体是土壤结构的基本单元,对土壤物理化学性质及生物化学性质具有重要影响。通过湿筛法对新疆水稻土团聚体及其有机碳的变化进行研究。结果表明:稻田土壤总有机碳随着种植水稻时间的延长而增加,种植水稻100a土壤总有机碳比荒地的增加了28.35g/kg;荒地开垦种植水稻后,随着种稻时间的延长,土壤水稳性团聚体(>250μm)和微团聚体(53～250μm)显著增加,<53μm矿物结合态团聚体则显著下降;水稳性团聚体和微团聚体有机碳随植稻时间的延长而显著增加,矿物结合态有机碳含量呈现下降趋势,不同粒级土壤团聚体有机碳之间存在明显差异。荒地开垦种植水稻有利于新疆水稻田土壤总有机碳、水稳性团聚体及其有机碳的积累,有利于土壤结构的改善和提高。
Soil aggregates are the basic unit of soil structure and have an important influence on the physicochemical and biochemical properties of soil. The wet sieving method was used to study the changes of aggregate and its organic carbon in paddy soils in Xinjiang. The results showed that the total organic carbon in paddy soil increased with the prolongation of rice planting time, and the total organic carbon in paddy soil increased by 28.35g / kg compared with the wasteland in the 100 years of paddy cultivation. After cultivation of paddy rice in wasteland, Water-stable aggregates (> 250μm) and microaggregates (53 ~ 250μm) increased significantly, while those with <53μm mineral-bound aggregates decreased significantly. Organic-carbon of water-stable aggregates and microaggregates increased with time The organic carbon content in the mineral bound state showed a downward trend, and there was a significant difference between the organic carbon content in the different size soil aggregates. Land reclamation and cultivation of rice in the wasteland is favorable for the accumulation of soil total organic carbon, water-stable aggregates and organic carbon in paddy soils in Xinjiang, which is benefit to the improvement and improvement of soil structure.