Chen Tao, Hao Xiao-Hui, Du Li-Jun, Lin Shan, Feng Ming-Lei, Hu Rong-Gui, Gao Jing-Yun
College of Resource & Environment, Huazhong Agricultural University, Wuhan 430070, China.
Ying Yong Sheng Tai Xue Bao. 2008 Jul;19(7):1494-500.
An incubation test was conducted with the paddy soil samples collected from three national long-term experiment stations in Hunan Province to study the characteristics of organic carbon mineralization under different fertilization treatments and its relationships with organic carbon fractions, i.e., total organic carbon (TOC), microbial biomass carbon (MBC), and water-soluble organic carbon (WSOC). The results showed that in all fertilization treatments, the cumulative amounts of CO2 and CH4 ranged from 448.64 to 1516.77 microg x g(-1) and from 15.60 to 33.34 microg x g(-1), respectively. In the 58 days of incubation, the mineralized carbon accounted for 3.59%-5.57% of TOC. The CO2 production rate was higher in the early phase of incubation, decreased rapidly then, and tended to stable afterwards; while the CH4 production rate had a slow increase first and declined rapidly then. A combined application of chemical fertilizers and manure or straw increased the cumulative amounts of CO2 and CH4 significantly. In all fertilization treatments, the cumulative mineralized C had significant correlations with TOC, MBC and WSOC, but less correlation with its percentage in TOC.
利用从湖南省三个国家级长期试验站采集的稻田土壤样本进行了一项培养试验，以研究不同施肥处理下有机碳矿化特征及其与有机碳组分（即总有机碳（TOC）、微生物量碳（MBC）和水溶性有机碳（WSOC））的关系。结果表明，在所有施肥处理中，CO2和CH4的累积量分别为448.64至1516.77μg·g-1和15.60至33.34μg·g-1。在58天的培养期内，矿化碳占TOC的3.59%-5.57%。培养初期CO2产生速率较高，随后迅速下降，之后趋于稳定；而CH4产生速率先缓慢增加，然后迅速下降。化肥与有机肥或秸秆的配合施用显著增加了CO2和CH4的累积量。在所有施肥处理中，累积矿化碳与TOC、MBC和WSOC显著相关，但与其在TOC中的百分比相关性较小。
