The Impact Of Forest Soil Physical And Chemical Properties On Fire In The Daxing’an Mountains Region

In this paper, Daxing’anling larch forest in 2012,2009,2003,1996 Burned for the study, After different intensties of forest fire disturbance, forest fire disturbance at different restoration years traces of soil physical and chemical were analyzed, the research results are as follows:(1) Variance analysis and comparison method, the physicochemical properties of the burned soil were analyzed by analysis of variance found that soil properties showed that there were significant differences between different age under different fire intensity.(2) After the study found that after the burned soil bulk density increases, the total porosity decreases with increasing age, the rate of increase of soil bulk density and total porosity smaller rate of decrease and gradually recover to the level before the fire, soil moisture after the first increase and decrease gradually restored to pre-fire levels, pH value of the soil after the fire on the rise.(3) Changes in soil organic matter content of the post-fire with mild decrease after the first increase after severe fire decreased soil organic matter content, but with the increasing age of the organic matter content of magnitude smaller decrease and gradually to the level before the fire recovery.(4) After mild burning soil nitrogen content is rising, after severe burning soil total nitrogen content decreased; severe, mild burning after soil nitrogen content showed a downward trend, with the increase of nitrogen content gradually burning life the level of pre-fire recovery.(5) After a mild burning soil total phosphorus and phosphorus content increased speed, after severe burn soil total phosphorus and phosphorus content decreased speed, the number of years between the fire and no obvious regularity.(6) After mild burning soil total potassium, potassium content changes speed reduction after the first increase after a severe fire soil total potassium, and potassium concentrations are decreased speed, there is no obvious regularity between the total potassium content with life while the speed potassium content increases gradually recover to the level of years before the fire.