摘要
采用淹水连续培养法研究了延边地区2种种植年限(80年和120年)3种施肥方式(单施化肥、化肥配施有机肥、单施有机肥)的稻田土壤可溶性有机碳(DOC)的时空分布格局。结果表明:长期淹水培养条件下稻田土壤DOC存在明显的时空变异性;单施化肥或化肥配施有机肥有利于长期淹水稻田表层土壤DOC的释放;单施有机肥促进了深层土壤DOC的积累,使耕层形成明显的土壤DOC垂直空间异质性,而化肥施用则削弱了土壤DOC垂直分布的异质性;连作80年稻田淹水培养期土壤DOC含量高于连作120年土壤,且连作80年稻田培养期DOC含量波动时间(28 d)短于120年土壤(49 d)。
Under water-logging condition, tempo-spatial variations of dissolved organic carbon （DOC） in Yanbian paddy soil with two cultivation years（120 years, 80 years） and three fertilization methods（chemical fertilizers, chemical and organic fertilizers, organic fertilizer） were investigated with sequential incubation method. The results showed that, there were obvious tempo-spatial variations of paddy soil DOC under water-logging condition. Chemical fertilizers or chemical and organic fertilizers were beneficial to DOC release in the upper paddy soil （0-10 cm） under water-logging condition. Organic fertilizers promoted the DOC accumulation in the lower soil （10-20 cm）, and made topsoil form obvious vertical spatial heterogeneity of soil DOC. But chemical fertilizers weakened the vertical spatial heterogeneity of soil DOC. The content of DOC of the continuous cropping in 80 years was significantly higher than that of the 120 years, and the content of DOC fluctuation time of the continuous cropping in^80 years （28 d） was significantly shorter than that of the 120 years （49 d）.
出处
《广东农业科学》
CAS
2015年第12期73-77,共5页
Guangdong Agricultural Sciences
基金
国家自然科学基金(31160103)
延边大学科技发展计划项目(延大科合字[2011]第32号)
吉林省科技厅重点攻关项目(20140204045SF)
关键词
种植年限
施肥类型
可溶性有机碳
稻田土壤
cultivation years
fertilization method
dissolved organic carbon
paddy soil
