Hao Rui-Jun, Li Zhong-Pei, Che Yu-Ping, Fang Hai-Lan
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.
Ying Yong Sheng Tai Xue Bao. 2008 Sep;19(9):1944-50.
With incubation tests in laboratory, the mineralization of organic carbon in various size aggregates of paddy soil was investigated under aerobic and submerged conditions. The results showed that the organic carbon mineralization in various size aggregates decreased quickly at the beginning of the incubation, but remained stable during the late period of incubation. The mineralization rate varied significantly with the size of the aggregates. Through the incubation time, the organic carbon in 1-2 mm aggregates had the highest mineralization rate, while that in < 0.053 mm aggregates had the lowest one. Statistic analyses indicated that the mineralization rate of organic carbon in various size aggregates was significantly and linearly correlated with the contents of organic carbon and microbial biomass carbon in the aggregates. 0.25-1 mm aggregates had the highest contribution to the cumulative mineralization of soil organic carbon, accounting for 41.77% under aerobic condition and 34.11% under submerged condition, while < 0.053 mm and 1-2 mm aggregates had the lowest contribution under aerobic and submerged conditions, accounting for 7.8% and 6.6%, respectively.
通过实验室培养试验，研究了水田土壤不同粒径团聚体中有机碳在好氧和淹水条件下的矿化情况。结果表明，不同粒径团聚体中有机碳矿化在培养初期迅速下降，但在培养后期保持稳定。矿化速率随团聚体粒径变化显著。在整个培养期间，1 - 2毫米团聚体中的有机碳矿化速率最高，而小于0.053毫米团聚体中的矿化速率最低。统计分析表明，不同粒径团聚体中有机碳矿化速率与团聚体中有机碳和微生物生物量碳含量显著线性相关。0.25 - 1毫米团聚体对土壤有机碳累积矿化的贡献最大，在好氧条件下占41.77%，在淹水条件下占34.11%，而小于0.053毫米和1 - 2毫米团聚体在好氧和淹水条件下的贡献最小，分别占7.8%和6.6%。
