Effects Of Different Fire Intensities On Soil Organic Carbon And Soil Nutrients In Pinus Tabulaeformis Forests In Northern China

In this paper,two locations in North China are selected as research plots to investigate and measure soil organic carbon and soil nutrient content at 0.5a and 1.5a after the occurrence of fire,observe the fluctuation trend of each index after fire,and use the single Factor analysis of variance and two-way ANOVA were used to analyze the effect of fire intensity on soil organic carbon and soil nutrients.Correlation analysis was used to compare the changes in the correlations between related indicators before and after the fire.Forest fires are sudden and destructive.Once they occur,they will bring enormous pressure on the ecosystem,affect the functioning of ecosystem services,interfere with the biochemical cycle of the earth,and destroy the global carbon balance.A series of studies on soil organic carbon and soil nutrient through forest fires will help to explore the dynamic changes of various indieators in the soil after burning,provide theoretical support for the restoration and management of fire-bumed vegetation,and simultaneously respond to and influence forest fires on global changes.The main conclusions are as follows:(1)Different fire intensity has a significant effect on soil organic carbon(SOC)content and soil nutrient content.The total potassium(TK)content of the fire increased with the increase of the fire intensity,but gradually decreased with the increase of the fire recovery period.The dynamic changes of other indicators of the soil are contrary to total potassium,and the soil nutrient contents of the fire decrease first,and then gradually recover.During the recovery,individual indicators will be higher than the level of no fire,but with the increase in the number of years after the fire,it will gradually return to no occurrence burning level.(2)The vertical distribution of the indicators in the soil,it means that decreasing with the depth of the soil layer;(3)The correlation between soil organic carbon and soil nutrients,and soil nutrients before and after the fire changed significantly,and the degree of correlation was also significant.Among the relationships,organic carbon and total nitrogen are highly positively correlated.(4)Burning resulted in an increase of quick-acting components,and the total nitrogen(TN)content decreased after the fire,but the content of fast-acting components such as ammonium nitrogen(NH4+?N)increased;(5)The data of the two places show different dynamic laws,and they are consistent to a certain extent,which can be used as a reference for studying the entire North China region.