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引言土壤通过增热和燃烧,随后使土壤的矿质状况和微生物学性质起变化,这样的生态学效应对导致形成植被关系很大(Ahlgren 1974)。燃烧对土壤理化性质的影响在温带林已有广泛的研究(Ahlgren 1960,Daubenmire 1968)。White等(1973年)报道燃烧能把土壤的无效钾和磷转变成水溶性的或有效态的养分。因为火灾在热带干旱落叶阔叶林发生比较频繁,当前的工作是要了解增热对森林上层土壤的影响。有人研究过火的强度和持续期,观察到火烧在表土层持续5—10分钟,
INTRODUCTION The ecological effects of soils on the formation of vegetation are greatly influenced by soil heat and combustion followed by changes in the mineral status and microbiological properties of soils (Ahlgren 1974). The effects of combustion on soil physicochemical properties have been extensively studied in temperate forests (Ahlgren 1960, Daubenmire 1968). White et al. (1973) reported that combustion can convert the soil’s inactive potassium and phosphorus to water-soluble or effective nutrients. Since fires occur more frequently in tropical and deciduous broad-leaved forests, the current work is to understand the effects of heat on the upper soils of forests. Someone studied the intensity and duration of over-fire and observed that the fire burned on the topsoil for 5-10 minutes,