亚热带低丘区退化红壤肥力质量恢复性能的研究

Restoration Characteristics of Fertility Quality of Degraded Red Soils in Subtropics of China

试验和分析结果表明 ,退化红壤主要肥力因素的恢复与农用物质的投入和土壤本身理化性质均存在明显的关系。随着物质投入量的增加 ,土壤肥力质量的恢复也逐渐加快。在自然条件下 ,土壤肥力因素的恢复主要与土壤本身属性有关 ,在肥力恢复过程中 ,土壤有机质的增加量与土壤本身有机质含量呈抛物线关系 ,约当土壤有机质含量在 2 0 g/ kg时 ,增幅最大 ;在一定的含氮范围内 ,土壤氮素的增加与土壤全氮含量呈正相关 ;而速效钾的增加量与土壤本身速效钾含量呈反相关。土壤水稳定性团聚体的恢复与土壤粘粒含量及有机质含量呈正相关。试验结果表明 ,在合理的管理条件下 。

The experimental results showed that the restoration of main fertility factors of degraded red soils was significantly related to matter input and soil physical and chemical properties. With increase of matter input, the restoration of soil fertility quality was accelerated gradually. Under the natural condition, the restoration of soil fertility factors was mainly controlled by soil properties. In the process of soil fertility restoration, the increase rate of organic matter was affected by the content of soil organic matter. There is a curve relation between the increase rate of organic matter and organic matter contents in the soils. The maximum increase rate of organic matter could be obtained when soil organic matter was about 20 g/kg. The nitrogen increase rate was positively related to soil total nitrogen for soils with nitrogen below 1.0g/kg. However, the increase rate of available potassium was negatively related to available potassium level in soils. The restoration of soil water stable aggregates was related to clay and organic matter contents. It was suggested that the restoration of fertility quality of degraded red soils was possible under reasonable management.