Effects of Land Use Patterns on Active Carbon and Nitrogen of Red Soil in the Slope Land of Hilly Area
Characteristic of content and variation trends of soil inorganic nitrogen (NH4+-N,NO3--N),dissoluble organic carbon and nitrogen (DOC,DON)and microbial biomass carbon and nitrogen (MBC,MBN) were invested from topsoil of natural forest,grassland,farmland,sasanqua plantation and pinewoods in a long-term sloped land use experiment.The results showed that the five patterns did not have significantly effect on soil DON,the annual average of soil DON content varied from 16.3 mg/kg to 18.2 mg/kg,and the dissoluble inorganic nitrogen (DIN) in farmland soil was significantly higher than that in oher four of partterns.The content of soil NH4--N was higer than soil NO3--N in all land use patterns,except for sasanqua plantation.The content of MBC and MBN varied from 195.7 mg/kg to 437.2 mg/kg,and from 28.6 mg/kg to 70.0 mg/kg,respectively,and the order was farmland＞grass land＞natural forest＞pinewoods＞sasanqua plantation.In the whole,the main composition of soil active carbon and nitrogen were MBC,MBN,except for farmland and sasanqua plantation,which content of DOC was equal or higher lightly than MBC content.The rate of MBC to DOC and MBN to DON varied from 1.1 to1.6,and from 1.7 to 3.9 respectively,and it was highest for grassland,and lowest for farmland.The change of soil active carbon and nitrogen did not depend on the content of soil SOC and TN,which might be affected by the runoff of soil active carbon and nitrogen.
land use patternsinorganic nitrogendissolved organic carbon and nitrogenmicrobial biomass carbon and nitrogen
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