南方红壤丘陵区不同生态恢复措施对土壤质量的影响

对南方红壤丘陵区的荒坡地采取不同生态恢复措施后的土壤理化性质指标进行了测定,分析结果表明:前埂后沟梯壁植百喜草的梯田果园对减小土壤密度、提高土壤持水能力和改善土壤通气状况的效果最好,横坡间种农作物的坡地果园对改善土壤结构效果最好;采取不同生态恢复措施的土壤有机质、全氮、全磷、全钾、速效磷含量均高于裸露地,且以前埂后沟梯壁植百喜草的梯田果园各指标含量最高。采取不同生态恢复措施的土壤碱解氮含量和速效钾含量同样以前埂后沟梯壁植百喜草的梯田果园最高。试验结果表明,采用不同措施的生态果园对土壤的生态恢复效果较好,尤以前埂后沟梯壁植百喜草梯田果园效果最好。

Effect of different ecological restoration measures on soil quality in red soil hilly region in South China

The physical and chemical properties of soil in red soft hilly region after adoption of different ecological restoration measures were analyzed. It is shown that the terrace orchard with Paspalum notatum flugge planted on the wall with mound before and ditch behind the platform, named measure 11, is the most effective measure to diminish the bulk density and improve the water-holding capacity and aeration state of soil, while the terrace orchard with slope land zonally covered by crops, named measure 8, is the most effective measure to improve the soil structure. All of the ecological restoration measures effectively improve the average contents of organic matters, total N, total P, total K, and available P, while measure 11 is the best.For increase of the contents of hydrolysis N and available K in soil, measure 11 is also the best. As a result, the soil quality is obviously improved by different ecological restoration measures. Of all the measures, the measure 11 is the most effective one.