土壤保肥-供肥机理及其调节Ⅳ.棕壤型菜园土肥力的调节与培育及其作用实质

Mechanism of nutrient preservation and supply by soil and its regulation IV. Fertility regulation and improvement of brown earth type vegetable garden soil and their essence.

棕壤型菜园土肥、瘦地盆栽试验对土壤肥力的调节培育及作用实质的研究表明 ,在不同的培肥措施下 ,肥、瘦地的营养物质含量与对照相比没有普遍提高 ,而土壤微团聚体的团聚度增加 ,不同粒级微团聚体的比例更趋合理 .土壤生产力水平与土壤肥力水平的本质代表 -特征微团聚体比例间没有显著的相关关系 .试验证明土壤肥力培育的实质在于从根本上改变了土壤的保肥供肥能力 ,而基于土壤本质属性的土壤特征微团聚体的比例比土壤营养物质含量与土壤生产力水平更适于作为土壤肥力水平及培肥效果评价的指标 .

Pot experiment studies on the fertility regulation and improvement of fertile and infertile brown earth type vegetable garden soils and their functionary essence show that under conditions of taking different soil fertility improvement measures,the nutrient contents in fertile and infertile soils were not always higher than the controls,but the aggregation densities of soil microaggregates were increased,and the proportion of different microaggregates was more rational.There was no significant relationship between soil productivity and soil microaggregates proportion.It is proved that the essence of soil fertility improvement consists in the ultimate change of the preservation and supply capacities of soil nutrients,and the proportion of soil microaggregates could be an integrative index to evaluate the level of soil fertility and the efficiency of soil improvement.