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中文摘要：
试验依托东北农业大学盐碱土长期定位试验站（始建于1995年），研究不同施肥年限下草甸碱土水稳性团聚体含量及其碳、氮分配规律。结果表明，长期施用有机肥可以显著增加〉0．25mm水稳性团聚体的含量52．3％．60．8％，0．5～0．25inm粒级的水稳性团聚体随着种植和有机肥施用年限的提高显著增加。施肥5年后，草甸碱土土壤团聚体中有机碳和全氮含量开始呈现稳中有升的趋势。大团聚体对有机碳和全氮的贡献率分别为47．9％～89．3％和52．9％～82．1％。〉5mm和5～2mm粒级的团聚体中有机碳和全氮含量与该粒级团聚体数量均呈显著性正相关。连续5年高量有机肥的投入，已经对草甸碱土培肥改良起到了显著效果，此后维持正常的施入量即可。
英文摘要：
The experiment were to study the distribution of soil organic carbon and nitrogen contents in meadow saline-alka- line soil on the basis of a long-term organic fertilization regime of saline-alkaline soil in long-term location station of saline-al- kaline soil of Northeast Agricultural University （ since 1995a）. The results showed that long-term application of organic fertilizer could significantly increase 〉0. 25 mm water stable aggregates contents by 52. 3% ~60. 8%, 0. 5 ~0. 25 mm aggregates were increased significantly with fertilization years. Water-stable aggregates, soil organic carbon and nitrogen contents in meadow alkaline soil slightly increased after continuous 5-years fertilizing. The contributing rates of macro-aggregates to bulk soil organic carbon and total nitrogen was 47.9% - 89. 3% and 52. 9% - 82. 1%. Soil organic carbon and nitrogen contents in particle size 〉 5 mm and 5 ~ 2 mm were significant positive correlation to the amount of aggregates. Saline-alka- hne soil fertility has been improved significantly after 5-years high fertihzer application rate, and then the fertilizer application rate should be maintained normal line.
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