Seasonal Dynamics of Soil Active Carbon and Nitrogen Pools in Surface Soil of Temperate Broad-Leaved and Korean Pine Mixed Forest
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Abstract
To investigate seasonal variation of soil active carbon and nitrogen pools in forest soils and their affecting factors,soil samples were collected for analysis from the surface soil layer of a temperate broad-leaved and Korean pine mixed forest in the Changbai Mountains,once every 1-3 days during the vegetation growing season.Results show that the contents of soil water-soluble organic carbon and nirate-N varied seasonally in the range of 48-80 and 0.68-2.30 μg·g-1,respectively,showing the same decreasing order of spring,summer,and autumn.Both the specific ultra-violet absorbance(ASUVA,254)of soil water extract and the content of ammonium-N were higher in summer than in spring or autumn,varying in the range of 3.19-3.94 L·mg-1 ·m-1and 6.1-12.0μg·g-1,respectively.In small time scales,soil active carbon and nirogen pools were sensitive to variation of soil water content.The correlation analysis suggests that soil wate regime and activities of plant root systems were the major factors affecting the seasonal dynamics of soil active carbon and nitrogen pools,and activities of soil microbial organisms also played a regulatory role.
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