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土壤团聚体养分含量是衡量土壤肥力的重要指标,比较研究了不同开垦年限不同粒级团聚体养分含量。结果表明:除全磷含量和碱解氮含量外,各粒级团聚体土壤养分含量均为未开垦土地最高,表现为随开垦时间的增加,团聚体土壤养分含量下降。2.0~5.0mm和<0.25mm团聚体土壤全磷含量以未开垦土地最高,其它粒级团聚体土壤全磷含量以开垦40a土地最高。各粒级团聚体土壤碱解氮含量以开垦40a土地最高,未开垦土地碱解氮含量最低。不同开垦年限土壤酸度差异不大。
Nutrient content of soil aggregates is an important index to measure soil fertility. The nutrient contents of aggregates of different size fractions under different reclamation years were comparatively studied. The results showed that except for the total phosphorus and the content of alkaline hydrolysis nitrogen, the content of soil nutrients in all aggregates was the highest in uncultivated land. The content of nutrients in aggregate decreased with the increase of reclamation time. Total phosphorus content in aggregates with 2.0 ~ 5.0mm and <0.25mm aggregates was the highest in uncultivated land, while total phosphorus content in aggregates with other grain fractions was the highest in reclaimed land for 40 years. The contents of soil alkali-hydrolyzable nitrogen in all fractions of aggregates were the highest in cultivated land for 40 years and the lowest in untreated land. Different reclamation years soil acidity difference is not big.