砒砂岩地区沙棘生态工程的土壤修复效果分析

The Effectiveness Analysis of Soil Remediation after the Seabuckthorn Ecological Engineering in Arsenic Sandstone Areas

本文以砒砂岩地区沙棘生态工程为研究对象,探讨沙棘生态修复工程实施对表层土壤理化性状的改良作用,初步研究结果表明:实施造林工程8年后,沙棘林地表层土壤的总孔隙度比荒坡地提高7.4%,土壤粘粒含量占49.15%,比荒地增加了75%;>5mm的大团粒含量为43.38%,是荒地的2.99倍,有机质含量为13.92g/kg,是荒地的3.68倍;全氮、全磷、全钾的含量分别为荒地的1.72倍、1.13倍与1.36倍,有效氮、速效钾、速效磷含量分别为荒地的4.54倍、3.29倍与7.6倍。说明沙棘造林使造林区的土壤结构得到显著改善,沙棘生态修复工程的生态效益突出,可有效降低该地区降雨对土壤的侵蚀和地表径流的冲刷。

This paper,taking the seabuckthorn ecological engineering as the research object,discussed the soil amelioration of physical and chemical properties after the seabuckthorn project in Arsenic sandstone areas,the results showed that：eight years after the implementation of afforestation project,compared with the wasteland,the total porosity ratio shortage of topsoil soil in seabuckthorn forest increased 7.4 percent,the clay content accounted for 49.15%,increased 75%;large aggregate（diameter 5mm） content was 43.379%,about 2.99 times of wasteland,the organic matter content was 13.92g/kg, 3.68 times of wasteland;the total nitrogen,phosphorus and potassium content were respectively 1.72, 1.13 and 1.36 times of which in wasteland,the available nitrogen,potassium and phosphorus levels were 4.54,3.29 and 7.6 times of which in wasteland. These all show that soil structure has been significantly improved by seabuckthorn afforestation,the ecological benefits of seabuckthorn ecological engineering is so effective with the reduction of soil erosion and surface runoff erosion which caused by rainfall.