森林土壤有机碳库组分定量化研究

用一级动力学方程研究了贵州省黎平县森林土壤活性、缓效性和惰效性有机碳库的变化及分解速率,模拟结果表明:各土壤剖面的土壤活性碳库一般占总有机碳的0.5%~7.6%,平均驻留时间(M ean Residue Tim e,MRT)为41~64天;缓效性碳库占总有机碳的45%~71%,平均驻留时间为3~30年;采用酸水解法测定惰效性碳库的库容,一般占总有机碳的20%~50%。活性碳库的变化规律为混交林>阔叶林>针叶林,缓效性碳库中混交林最大,其它两种林分规律不明显;不同林龄的杉木(8年,16年,40年),非活性碳库(缓效性碳库和惰效性碳库之和)的含量变化规律为40年>16年>8年,说明40年生的杉木下土壤固碳能力比8年和16年的强;16年的又比8年的强。

Quantification of Forest Soil Organic Carbon Pools:A Case Study in Liping County

Soil organic carbon pool is the main part of the terrestrial carbon reservoir and plays an important role in the research of terrestrial carbon cycle.According to the turnover time of soil organic carbon,soil organic carbon pools are divided into active,slow and resistant pools.The three pools comply with three first order model.The paper uses the model and decomposition curves of soil organic carbon to fit active pool and its decomposition rate,slow pool and its decomposition rate.The results show that the size of active pool from different profiles accounts for 0.5%~7.6% of total soil organic carbon and the mean residue time is 41~64 days;slow pool,45%~71%,3~30 years;Resistant pool measured by using acid hydrolysis accounts for 20%~50%;The trend of active carbon pool increases with the order of mixed,deciduous and conifer;Slow pool of mixed forest accounts the greater proportion and the other forest had no obvious trend.The trend of total content of slow and resistant pools is 40a>16a>8a, which shows the trend of soil organic carbon sequestration of Chinese fir.