林火与土壤肥力

本文综述了世界上一些国家有关林火对土壤物理性质、化学性质、土壤微生物活性的影响,指出林火对土壤肥力影响受火强度、火持续时间、可燃物种类和数量、土壤性质、降雨状况及植被恢复状况等因素的影响。在我国南方林区用炼山方式清理迹地,对地力长期维持不利。建议对皆伐火烧地采用人工促进天然更新或林农复合经营方法,以维持地力,促进林木持续生长。

Forest Fire and Soil Fertilities

After an analysis of lots of research results on soil chemical properties and microbe activities of soil in foreign countries and China,it is pointed out that the effect of forestfire on soil fertilities being dependent on the fire intensity,duration of fire,type and quantityof the combustible material,soil properties the rain eroding force,condition of vegetation recover after fire and of cultivation measures;using the controlled burning to clean woodland for plan areas in south China is unfavorable to keep soil fertilities for a long time.In order to keep soil fertilities for a long time,the artificial stimulating natural regeneration or the comples management agroforestry system are suggested to adopt for all cutting woodland.