侵蚀红壤区不同水土保持措施的土壤改良效果研究

Effects of Soil Amelioration with Different Soil and Water Conservation Measures of Eroded Red Soil Region

结合野外调查和室内分析,研究了侵蚀红壤区不同水土保持措施下坡地土壤pH值和养分含量的变化,分析了不同水土保持措施的土壤改良效果。研究结果表明,不同水土保持措施显著影响侵蚀红壤区坡地土壤pH值和有机质、全氮、碱解氮、全磷、速效磷的含量,但是对全钾和速效钾含量影响不显著。牧草和耕作措施可以显著提高土壤pH值和有机质、全氮、碱解氮、全磷、速效磷的含量,显著改善土壤肥力状况,梯田对土壤肥力状况影响不显著。研究区土壤肥力状况不受钾素限制,可以将土壤有机质作为衡量土壤肥力状况的简化指标。

The paper studied the variations of pH value and nutrient content of slope land in eroded red soil region under the conditions of using different soil and water conservation measures and analyzed the effects of soil amelioration with different soil and water conservation measures combining with field survey and laboratory analysis.The outcomes show that the different soil and water conservation measures notably affect the pH value and the contents of organic matter,total nitrogen,available nitrogen,total phosphorus and available phosphorus of eroded red soil region,but the influence to the contents of total potassium and available potassium are not remarkable.Planting forage grass and cultivation measures can remarkably increase the pH value and the contents of organic matter,total nitrogen,available nitrogen,total phosphorus and available phosphorus of the soil and improve the conditions of soil fertility,while the influence of terraced fields to the soil fertility status is not obvious.The soil fertility condition of the studied area is not restricted by potassium.It can utilize organic matter as a simplified index to judge the conditions of soil fertility.