冀北辽河源自然保护区油松林火烧迹地土壤化学性质研究

以冀北辽河源自然保护区油松林火烧迹地为研究区,研究不同土壤深度(>0~5cm、>5~10cm、>10~20cm)以及不同火强度(未火烧、轻度、中度、重度和极度)干扰下油松林土壤化学性质,对火烧迹地土壤的改良和油松林的恢复更新具有实践意义.研究结果表明:火烧1年后,土壤pH 有所升高;土壤有机碳、全氮、全钾质量分数除在极度火强度下,其他火强度下都有所升高;磷和有效磷在过火土壤中的质量分数亦增加;土壤pH、有机碳、全氮、全钾、全磷和有效磷质量分数在土层垂直分布上的状况为表层土大于深层土.因此,火烧对土壤表层产生较大影响且强度合理的火干扰可以有效提高土壤肥力. 

Soil chemical properties at burnt forest sites in Liaoheyuan Nature Reserve in North Hebei Province

Effects of soil depth (＞0～5 cm,＞5～10 cm,＞10～20 cm),burning intensity (not burned,slightly burned,moderately burned,severely burned,extremely burned) on soil chemical properties at burned Pinus tabulaeformis forest sites in Liaoheyuan Nature Reserve in North Hebei Province were investigated,to provide some theoretical basis for improvement of burned soil and restoration of Pinus tabulaeformis forest.It was found that the soil pH had increased one year after the incident.The organic C,total N and total K also increased after the fire,but such contents rather decreased under extremely burned condition.P and available P in the burned soil also increased.In examination of vertical distribution,soil pH,organic C,total N,total K,total P and available P were all larger in surface soil than deep soil.Fire therefore has great impact on the chemical properties of surface soil,measured fire intensity could effectively improve soil fertility.