中文摘要：

通过23年的长期田间定位试验观测,研究了施肥对红壤水稻土不同发生层团聚体组成、有机碳含量及有机碳库分布的影响.试验设不施肥（CK）、无机肥（NPK）、有机肥（猪粪＋紫云英）（OM）和无机肥与有机肥配施（NPKM）等4个处理.结果表明,＞3 mm团聚体含量随土层深度呈增加趋势,而其他粒径的团聚体含量则呈下降趋势.施肥处理有利于1～3 mm和0.25～1 mm团聚体含量增加.各处理中,各层同粒径团聚体有机碳含量从高到低的顺序为：A＞P＞W1、W2.不同粒径团聚体中有机碳含量有明显差异,除＜0.05 mm团聚体外,粒径愈细,有机碳含量愈高.1～3 mm和0.25～1 mm团聚体含量与全土有机碳含量呈显著正相关.不同施肥处理有机碳储量表现出NPKM＞OM＞NPK＞CK的趋势.同施肥处理同发生层不同粒径团聚体有机碳储量从高到低的顺序为：＞3 mm、1～3 mm、0.25～1 mm、0.05～0.25 mm和＜0.05 mm,且差异显著.施肥处理增加的新碳主要向1～3 mm、0.25～1 mm团聚体富集.

英文摘要：

A long-term field experiment was carried out in Jinxian County, Jiangxi Province, China. One of the aims of the experiment was to study soil organic carbon （SOC） distribution in different size groups of aggregates in four horizons （A, P, W1, W2） of red paddy soil impacted by different fertilization patterns. The experiment was designed to have four treatments： （1） Zero fertilization （CK）, （2） chemical fertilizers alone （NPK）, （3） organic manure alone （OM） and （4） combination of chemical fertilizers and organic manure （NPKM）. Results show that the percentage of soil aggregates in the size group of 〉 3 mm increased in all horizons, which were in the following order： A 〉 P 〉 W1 〉 W2, but the percentages of the other groups decreased, following the same order. The treatments of NPK, OM and NPKM were in favor of increasing the percentage of aggregates in the size groups of 1 - 3 mm and 0.25 - 1 mm. Results also show that the content of SOC in aggregates of the same horizon in all the fertilization treatments decreased in all horizons, showing a sequence of A 〉 P 〉 W1 , W2 The contents of SOC in different size groups were significantly different and showed an increasing sequence of 〉 3 mm 〉 1 - 3 mm 〉 0.25 -1 mm 〉 0.05 - 0.25 mm except for the size group of 〈 0.05 mm being the lowest in content. The total content of SOC showed a positively linear relationship with the content of aggregates of the size groups of 1 - 3 mm and 0.25 - 1 mm. The storage of total SOC varied between the treatments, showing an increasing sequence of CK 〉 NPK 〉 OM 〉 NPKM, The storages of total SOC in different-sized aggregates of the same horizon in the same treatment were also significantly different, showing a decreasing sequence of 〉 3 mm 〈 1 - 3 mm 〈 0.25-1 mm 〈 0.05 - 0.25 mm 〈 0.05 mm. The newly enriched organic carbon mostly appeared in the size groups of 1 - 3 mm and 0.25 - 1 mm.