渭北旱塬花椒地埂林土壤抗蚀抗冲性研究

Study on Soil Anti-erosion and Anti scour of Prickly Ash at Edges of Terraces in Drought Upland of Weibei

通过对花椒地埂林土壤抗蚀性、抗冲性指标连续 3年的测定和分析结果表明 :花椒地埂林土壤具有显著的固埂保土效益 ,土壤抗蚀性、抗冲性均高于无林埂土壤。土层腐殖质含量、水稳性团聚体含量及表层土壤水稳性团聚体风干率、团聚状况、团聚度均高于无林地埂土壤 ,土壤分散率、分散系数均低于无林埂土壤。土壤抗冲性大小与树龄、冲刷水量、土壤毛根含量、腐殖质含量关系密切 ,土壤抗冲性变化规律与抗蚀性吻合 ,土壤抗蚀性强弱与抗冲性强弱趋于一致。

Indicators of soil anti erosion and anti scour of prickly ash at edges of terraces were analysed.The result showed that root systems of prickly ash at edges of terraces had significant benefit for fixing edges of terraces and conserving soil.The contents of humus,aggregate with stable water,the rate of air dry of stable water aggregate,aggregation state,degree of aggregate were higher than those in no prickly ash land while soil dispersion and coefficient of dispersion of former were lower than latter.Soil anti scour was close to tree age,water by scoured,numbers of smaller roots and humus content.Change of soil anti scour was agreement with soil anti erosion.