Wu Yan, Jiang Chang-sheng, Hao Qing-ju
Key Laboratory of Eco-environments in the Three Gorges Reservoir Region( Ministry of Education), College of Resources and Environment, Southwest University, Chongqing 400715, China.
Huan Jing Ke Xue. 2012 Aug;33(8):2804-9.
The seasonal dynamics of soil organic carbon (SOC), readily oxidized carbon (ROC), dissolved organic carbon (DOC) and microbial biomass carbon (MBC) in a purple paddy soil were studied in a long-term field experimental station in Chongqing, China. The results showed that the seasonal variations of the contents of SOC, ROC and MBC had similar trends in the rape growing season. The contents were much higher in the early and late stages than in the middle stage of the rape growth. SOC, ROC and MBC all achieved the highest values of 16.20 g x kg(-1), 3.58 g x kg(-1) and 309.70 mg x kg(-1) at the end of the growing period, respectively. The seasonal change of DOC content presented as a single peak and reached to the highest value of 37.64 mg x kg(-1) at the middle stage of the rape growth. The temporal dynamics of the allocation ratios of ROC, MBC and DOC were similar to that of their contents. The allocation ratios of ROC, MBC and DOC were 15.49%-23.93%, 1.44%-2.06% and 0.11%-0.32% during the rape growing season, respectively. The influencing factors of SOC and ROC contents were the soil temperature at 5 cm soil depth, soil total nitrogen content and pH. MBC content was jointly impacted by the soil temperature at 5 cm soil depth, root biomass and its C and N contents. DOC content was mainly affected by soil moisture.
在中国重庆的一个长期田间试验站，研究了紫色水稻土中土壤有机碳（SOC）、易氧化碳（ROC）、溶解有机碳（DOC）和微生物生物量碳（MBC）的季节动态。结果表明，在油菜生长季节，SOC、ROC和MBC含量的季节变化趋势相似。在油菜生长的早期和后期，这些含量远高于中期。在生长期末期，SOC、ROC和MBC分别达到最高值16.20 g x kg(-1)、3.58 g x kg(-1)和309.70 mg x kg(-1)。DOC含量的季节变化呈单峰型，在油菜生长中期达到最高值37.64 mg x kg(-1)。ROC、MBC和DOC的分配比例的时间动态与其含量相似。在油菜生长季节，ROC、MBC和DOC的分配比例分别为15.49%-23.93%、1.44%-2.06%和0.11%-0.32%。SOC和ROC含量的影响因素是5 cm土壤深度处的土壤温度、土壤全氮含量和pH值。MBC含量受到5 cm土壤深度处的土壤温度、根系生物量及其碳氮含量的共同影响。DOC含量主要受土壤湿度影响。
