不同施肥处理对红壤性水稻土团聚体的分布及有机碳、氮含量的影响  

Effects of Fertilizer Management Practice on Distribution of Aggregates and Content of Organic Carbon and Nitrogen in Red Paddy Soil

作　　者：郭菊花[1] 陈小云[1] 刘满强[1] 胡锋[1] 李辉信[1] 

机构地区：[1]南京农业大学资源与环境科学学院,南京210095

出　　处：《土壤》2007年第5期787-793,共7页Soils

基　　金：国家自然科学基金项目(40371059)资助

摘　　要：土壤采自江西省红壤研究所历经22年的肥料定位试验地,各施肥处理为:不施肥(CK)、施N肥(N)、施P肥(P)、施K肥(K)、施N、P肥(NP)、施N、K肥(NK)、施N、P、K肥(NPK)、施双倍N、P、K肥(2NPK)、施N、P、K肥和有机肥(NPK+OM).研究了不同施肥处理对水稻土团聚体分布的影响以及土壤有机C、N在各级团聚体上赋存的情况.研究结果表明:有机C、N主要分配在2～0.25 mm的大团聚体上,C/N比随着团聚体粒级的减少而降低;水稻土团聚体的形成与有机C(SOC)密切相关,表现出与'层次性'机制相符的现象;施P、K、NK肥和NPK+OM显著提高大团聚体的含量和团聚体的稳定性;NPK+OM也显著提高土壤有机C、N和各级团聚体上的有机C、N的含量.Soil samples were collected from a field that had been under long-term fertilization experiment for 22 years, in the Red Soil Institute of Jiangxi Province in Jinxian County for analysis of effects of fertilization on distribution of aggregates, and organic carbon and nitrogen sequestration in aggregates of different sizes. The experiment had 9 treatments, i.e. ① CK, ② N, ③ P, ④ K, ⑤ NP, ⑥ NK, ⑦ NPK, ⑧ 2NPK and ⑨ NPK+OM. Results showed that organic carbon and nitrogen were mainly sequestrated in macroaggregate, 2~0.25 mm in size, and C/N ratio of aggregates decreased with aggregate size. The formation of aggregates in the red paddy soil was closely related with organic carbon content, displaying a phenomenon in conformity with the classical 'stratification' mechanism of the aggregate-SOM interactions. The treatments of P, K, NK and NPK+OM prominently increased the content of macroaggregates and stability of aggregates. And the combined treatment of NPK+OM also increased organic carbon and nitrogen concentration in bulk soil and sequestration in aggregates of different sizes.

关 键 词：长期肥料试验 水稻土 团聚体稳定性 有机碳、氮 

分 类 号：S158.3[农业科学—土壤学] S152.4[农业科学—农业基础科学]