长期施肥对水稻土土壤有机碳矿化的影响  

Effects of long-term fertilization on paddy soil organic carbon mineralization

作　　者：陈涛[1] 郝晓晖[1] 杜丽君[2] 林杉[1] 冯明磊[1] 胡荣桂[1] 高璟贇 

机构地区：[1]华中农业大学资源与环境学院,武汉430070 [2]河北旅游职业学院,河北承德067000

出　　处：《应用生态学报》2008年第7期1494-1500,共7页Chinese Journal of Applied Ecology

基　　金：中国科学院知识创新工程项目(KZCX2-YW-423);国家自然科学基金资助项目(40471131)

摘　　要：以湖南省3个国家级稻田肥力变化长期定位监测点的土壤为材料,通过室内分析和培养试验,研究了不同施肥处理下土壤有机碳矿化特征及土壤总有机碳、微生物量碳和水溶性有机碳对土壤有机碳矿化的影响.结果表明:3个监测点各施肥处理的土壤CO2累积排放量为448.64～1516.77μg·g-1,CH4累积排放量为15.60～33.34μg·g-1,在58d的培养期内土壤有机碳矿化量占总有机碳的3.59%～5.57%;不同处理CO2的产生速率均在前期保持较高水平,之后迅速下降,后期较慢并趋于平稳,CH4的产生速率表现为先缓慢升高后迅速降低的变化趋势;化肥配施有机肥处理显著增加了CO2和CH4的累积排放量;不同施肥处理土壤有机碳矿化量与总有机碳、微生物量碳和水溶性有机碳含量之间的相关性达到了极显著水平,而与矿化量所占土壤总有机碳的比例无明显相关关系.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 1 516.77 μg·g^-1 and from 15.60 to 33.34 μg·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.

关 键 词：长期施肥 水稻土 矿化作用 

分 类 号：S154[农业科学—土壤学]