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选取位于干旱-半干旱区的黄土高原陕西境内表土样品为研究对象,对其有机碳(Soil organiccarbon,简称SOC)和无机碳的空间分布及陕西省碳储量进行初步研究。结果表明:黄土高原陕西境内有机碳和无机碳的平均值分别为5.41g/kg和17.04g/kg,有机碳的空间分布是自北向南呈现出增加的趋势,这也与所处环境相符,无机碳的空间分布特征沿着纬度呈现自北向南逐渐增加的趋势,特别是北纬36o以北;将每一区域内CaCO3含量的平均值与相对区域的降雨量和温度分别进行一元线性拟合,其拟合系数分别为R=0.338和0.182,碳酸盐含量与降雨量和温度的相关性并不显著。陕西省表土有机碳和无机碳储量分别为0.272Pg和0.856Pg,无机碳储量远大于有机碳储量,这与其所处干旱环境有关。
The surface soil samples of Shaanxi Province in the arid and semiarid area of Loess Plateau were selected as the research object, and the spatial distribution of soil organic carbon (SOC) and inorganic carbon and the carbon storage in Shaanxi Province were studied. The results showed that the average values of organic carbon and inorganic carbon in Shaanxi Province were 5.41g / kg and 17.04g / kg, respectively. The spatial distribution of organic carbon showed an increasing trend from north to south, which was consistent with the environment. The spatial distribution of inorganic carbon showed a trend of increasing from north to south along latitude, especially north of north latitude 36o. The average of CaCO3 content in each area was linearly fitted to the rainfall and temperature in the opposite region, The fitting coefficients were R = 0.338 and 0.182, respectively. The correlation between carbonate content and rainfall and temperature was not significant. The contents of organic carbon and inorganic carbon in topsoil of Shaanxi Province are 0.272Pg and 0.856Pg, respectively. The content of inorganic carbon is much larger than that of organic carbon, which is related to the arid environment in which it is located.