化肥与有机物料配施对黄褐土团聚体分布及有机碳含量的影响

Effect of Chemical Fertilizers Combined with Organic Materials on Aggregate Distribution and Its Organic Carbon Content in Yellow Cinnamon Soil

通过对黄褐土小麦/玉米轮作定位试验,研究了不同施肥模式对土壤团聚体分布、稳定性及团聚体中有机碳含量、各级团聚体对有机碳的贡献率的影响。结果表明:黄褐土的水稳性团聚体组成主要以<0.25 mm粒径为主,施有机物料增加了>0.25 mm水稳性团聚体,同时提高团聚体的稳定性。团聚体有机碳主要存在于<0.25 mm水稳性团聚体中,并随着水稳性团聚体粒径的增大而明显增加。化肥配施秸秆对黄褐土水稳性团聚体影响较大,显著增加>0.053 mm各粒径水稳性团聚体含量,降低<0.053 mm水稳性团聚体含量,同时显著提高团聚体平均重量直径(MWD)、几何平均直径(GMD)和稳定率(R0.25),并且化肥配施秸秆对土壤中>0.25 mm各粒径团聚体对有机碳的贡献率增加更为明显。而化肥配施鸡粪对土壤中>0.25 mm各粒径团聚体中有机碳增加效果最好。

Based on the yellow cinnamon wheat/maize rotation station, the effect of different fertilization patterns on soil aggregate distribution and stability had been studied and its organic carbon content, the contribution rates of different size class aggregates to organic carbon had been determined. Results showed that water stable aggregates in the yellow cinnamon soil consisted mainly of < 0.25 mm particle size. The application of organic materials increased the content of > 0.25 mm water stable aggregates and improved the aggregate stability. Organic carbon mainly existed in the < 0.25 mm water stable aggregates, and enhanced with the increase of water stable aggregate size. The combination of chemical fertilizer and straw had a great impact on water stable aggregates in the yellow cinnamon soil,significantly increased the content of > 0.053 mm water stable aggregates, and decreased the content of < 0.053 mm water stable aggregates. At the same time, the aggregate mean weight diameter(MWD), geometric mean diameter(GMD) and stable rate(R0.25) were significantly enhanced and the contribution ratio of > 0.25 aggregate to organic carbon obviously increased after the application of chemical fertilizer combined with straw. The chemical fertilizer combined with chicken manure had the significant effect on soil organic carbon of > 0.25 mm aggregates.