不同开垦年限黑土团聚体养分变化

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 Changes of Soil Aggregates f rom Different Reclamation Years

Nutrient content of soil aggregate is an important index to measure soil fertility ,nutrient content of different size fraction soil aggregate from different reclamation years was studied .The results revealed that ：ex-cept for total phosphorus and available nitrogen content ,the nutrient content of different size fraction soil ag-gregate from uncultivated land was the highest .With the increasing of reclamation years ,nutrient content of soil aggregate was decreasing .Total phosphorus content of 2 .00～5 .00 mm and ＆lt;0 .25 mm aggregate from uncultivated land was the highest ,total phosphorus content of other size fraction aggregate from reclamation for 40 years was the highest .Available nitrogen content of soil aggregate from uncultivated land was the low-est ,from reclamation for 40 years was the highest .Soil acidity of soil aggregate from different reclamation years had no difference .