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《Journal of Central South University of Forestry & Technology》 2018-02
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Forest soil organic carbon storage and its spatial distribution pattern in Henan province

TIAN Yaowu;HE Chunling;LIU Yang;ZHANG Chong;GENG Wanlu;College of Forestry,Henan University of Science and Technology;  
According to the inventory data of the second type inventory of forest resources, three-level regionalization for forestry development and 810 soil sampling data in Henan province, we established SOC depth distribution mass density models for 12 threelevel forest areas, selected evaluation parameters for the results of model simulation such as Nash–Sutcliffe coefficient of efficiency(E), percentage error(V) and determining the coefficient of determination(R2). Results showed that: SOC density in mineral soils generally decreased with depth; however, this decrease was non-linear and had been frequently modeled as an exponential function. The SOC density in top soil( 20 cm) was significantly affected by vegetation type. The surface(0–20 cm) SOC densities in mountain area were higher than those in plain area, the difference was significant(P 0.05). The variation of density in the deeper layer( 40 cm) was not consistent with the top layer, soil organic carbon density in the bottom soil layer was significantly affected by soil texture, the density values of sandy soils were higher than those of clayey soils(P 0.05). Forecast values of top layer of sandy soil had a tendency to be lower, and forecast value of the deep layer might be too high. The model simulation capabilities were relatively high(E 0.6), and the percentage error was within a range with acceptable accuracy(V ±15%). The model simulation values were relatively consistent with the observed values. The model could be used to simulate the depth distribution of forest soil organic carbon in 12 forest areas. SOC densities of Henan were lower when SOC densities in the 0-100 cm soil layers were only used to characterize the regional SOC density. When compared with the SOC densities in the range of 0-200 cm in the soil profile, the SOC densities in the 0-100 cm soil layer was about 19.99% lower than the overall density.
【Fund】: 国家自然科学基金(31670616);; 河南省科技攻关计划项目(152102110059)
【CateGory Index】: S714.2
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