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以古尔班通古特沙漠南缘原始盐漠为研究对象,测定不同深度的土壤有机碳和土壤微生物碳含量,以分析它们之间的响应关系。结果表明:(1)在土壤垂直剖面上,土壤微生物碳(SMC)含量与有机碳(SOC)含量呈现极显著正线性相关(R2=0.63,p=0.0003)。(2)SMC出现了2个明显的改变界面(20cm,80cm),0～20、20～80、80～500cm值分别为:2.24～3.06、0.19～0.72、0.0017～0.0097mg.kg-1;0～20cm和20～80cm的SMC差异极显著(p<0.0001),20～80cm和80～500cm的SMC差异显著(p<0.05)。(3)对应于SMC的土壤层划分,SOC在0～20cm、20～80cm和80～500cm同样具有一定的分层性。(4)我们把具有不同微生物活性的有机碳层分别定义为活性、惰性、稳定性有机碳库,土壤垂直剖面上微生物碳的分布很好地表征了土壤中活性、惰性、稳定性有机碳库的分布;通过对这3种碳库所在土层进行合理划分,可以定量分析土壤中3种有机碳库的储量。
Taking the primitive salt desert in the southern margin of the Gurbantunggut desert as the research object, the soil organic carbon and soil microbial carbon in different depths were measured to analyze the response relationship between them. The results showed that: (1) There was a significant positive linear correlation between soil microbial carbon (SMC) and organic carbon (SOC) in soil profiles (R2 = 0.63, p = 0.0003). (2) SMC appeared two obvious change interface (20cm, 80cm), 0 ~ 20,20 ~ 80,80 ~ 500cm values were: 2.24 ~ 3.06,0.19 ~ 0.72,0.0017 ~ 0.0097mg.kg-1; The differences of SMC between 0 ~ 20cm and 20 ~ 80cm were significant (p <0.0001). There was significant difference between SMC of 20 ~ 80cm and 80 ~ 500cm (p <0.05). (3) Corresponding to the soil layer division of SMC, the SOC also has certain stratification in 0 ~ 20cm, 20 ~ 80cm and 80 ~ 500cm. (4) We defined organic carbon layers with different microbial activities as active, inert and stable organic carbon pools respectively. The distribution of microbial carbon in the vertical profiles of soils is a good indicator of the active, inert and stable organic carbon pools The distribution of the three organic carbon pools in the soil can be quantitatively analyzed by reasonably dividing the soil layers of the three kinds of carbon pools.