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本文利用土壤培养实验和双指数模型(把土壤有机碳划分为活性碳和缓效性碳库)的方法,来分析确定长白山和祁连山的土壤有机碳的动态变化。分析和拟合土壤有机碳矿化释放的CO2的速率。结果表明:活性碳库占总有机碳的1.0%–8.5%,平均驻留时间的平均值为24天;缓效性碳库占总有机碳的91%–99%,平均驻留时间的平均值为179年。根据缓效性碳的大小和平均驻留时间可以得知,祁连山森林土壤的有机碳较长白山的难分解。通过分析影响森林土壤有机碳矿化的因素––土壤粘粒含量、海拔和温度,结果显示两种森林土壤有机碳的分解快慢与其温度正相关,并且长白山和祁连山的累积的土壤有机碳和缓效性碳的含量随土壤粘粒含量的增加而呈线性增加,其相关系数分别为0.7033和0.6575,充分表明温度和土壤粘粒含量对土壤有机碳的矿化有较大的影响。
In this paper, the dynamic changes of soil organic carbon in Changbai Mountain and Qilian Mountains were analyzed by using soil culture experiment and double exponential model (the soil organic carbon was divided into activated carbon and slow-acting carbon pool). Analyze and fit the rate of CO2 release from soil organic carbon mineralization. The results showed that the active carbon pool accounted for 1.0% -8.5% of the total organic carbon and the average residence time was 24 days. The slow-acting carbon pool accounted for 91% -99% of the total organic carbon. The mean residence time The value is 179 years. According to the availability of carbon and the average residence time, it can be learned that the organic carbon in forest soil of Qilian Mountains is more difficult to decompose than that of Changbai Mountain. By analyzing soil clay mineral content, altitude and temperature, which affect the mineralization of forest soil organic carbon, the results show that the decomposition rate of soil organic carbon in the two forest types is positively correlated with temperature, and the accumulated soil organic carbon in Changbai Mountain and Qilian Mountains is slow and slow The content of sexual carbon increased linearly with the increase of soil clay content, and the correlation coefficients were 0.7033 and 0.6575 respectively, which showed that the temperature and soil clay content had a great influence on the mineralization of soil organic carbon.