不同土地利用方式下土壤团聚体组成特征及稳定性

摘要

[Objective]To study the composition characteristics and stability of soil aggregate under different land use ways.[Method] Distribution and stability of soil aggregate in six kinds of particle size (≥5.00, 2.00-<5.00, 1.00-<2.00, 0.50-<1.00,0.25-<0.50, < 0.25 mm) under different land use ways were studied, on the basis of the understanding of granular structure, soil aggregate size distribution under three treatment methods were analyzed.[Result] With the increase of oscillation frequency, percentage content of ≥1.00 mm particle size aggregate reduced gradually, percentage content of < 1.00 mm particle size aggregate increased gradually.In three treatment methods (SW, WS, FW), soil aggregate size distribution also had different changes, the content of ≥5.00 mm particle size under the SW treatment was biggest, under the FW treatment, the content of ≥5.00 mm particle size was least.[Conclusion] Damaging of SW treatment mode on soil aggregate was least, under the same treatment way aggregate stability also increased accordingly with the increase of slope.%[目的]研究不同土地利用方式下土壤团聚体组成特征及稳定性.[方法]研究不同土地利用方式下土壤团聚体在(≥5.00、2.00~<5.00、1.00~<2.00、0.50~<1.00、0.25~<0.50、<0.25 mm)6种粒径下的分布情况及稳定性;在对团粒结构了解的基础上,又进一步分析了3种处理方式[慢速湿润法(SW)、扰动湿润法(WS)、快速湿润法(FW)]下土壤团聚体粒径分布特征.[结果]随着振荡次数的增加,≥1.00 mm的粒径百分比逐渐减少,而<1.00 mm的粒径百分比逐渐增加.3种处理方式(SW、WS、FW)下,土壤团聚体粒径分布不同,≥5.00 mm粒径百分比在SW处理方式下最大,在FW处理下≥5.00 mm粒径百分比最小.[结论]SW处理方式对土壤团聚体破坏性最小,同种处理方式下随着坡度的增加团聚体的稳定性也相应增加.