稻菜轮作下不同施肥处理对土壤团聚体的影响

Effects of Different Fertilization on Soil Aggregate under Rice-vegetable Rotation

通过田间定位试验,研究稻菜轮作制下不同施肥处理对土壤团聚体的影响。结果表明,单施化肥土壤有机质降低;而有机肥与化肥配施可增加土壤有机质,高碳有机肥、油菜秸秆有机肥与无机肥配施可以显著增加土壤有机质,土壤分形维数最小。稻菜轮作下各施肥处理土壤微团聚体(<0.25mm)增加,大团聚体(2～0.25mm)减少,土壤分形维数减小,土壤结构有较好改善。可见,施用有机含碳量高的有机肥可显著增加土壤有机质,较好的改善土壤结构。

Based on the field located experiments, effects of different fertilization treatments on the soil ag- gregate under rice-vegetable rotation were analyzed. The results showed that single fertilizer applying would reduce the content of organic matter, while mixing application of organic and inorganic fertilizers could increase the content of organic matter. Especially both of the fertilization treatments（high carbon organic fertilizer and rape straw organic fertilizer）could increase the content of organic matter significantly. Under rice-vegetable rotation, the content of soil microaggregate（〈O. 25 ram） increased while content of soil macroaggregate （2～0.25 mm） and the fractal dimension of soil aggregates decreased under fertilization treatments. Minimum of the fractal dimension appeared in mixing application of high carbon organic and inorganic fertilizers which could improve the soil structure.