平果铝矿高效复垦示范区土壤质量评价

以平果铝矿高效复垦示范区为例，由于平果铝矿在土地复垦时已经考虑了机械作业对土壤的滚压，所以忽略土壤紧实度指标，而只选择土壤有机质、全氮、有效磷、速效钾、pH值、含水率、密度和EC等8项指标对复垦土壤质量进行了综合评价。平果铝矿自1999年开始高效复垦示范区建设，在研究区分别对高效复垦1a、3a、5a、7a、9a的不同示范区土地上采集了5种不同示范区的土壤样品，分层次分别进行评价土壤质量。利用matlab7．0软件对数据进行处理与分析，结果显示：不同高效复垦示范区土壤质量差异较大，经济农作物、甘蔗示范区土壤较好，蔬菜、木薯示范区次之，桉树示范区较差；随着复垦年限的增加，土壤质量不断提高，但桉树出现异常现象，对于桉树示范区土壤质量的改善有待进一步研究。图2，表10，参16。

Soil Quality Evaluation of Reclamation Demonstration Area in Pingguo Bauxite Mine

Taking the efficient reclamation demonstration zones in Pingguo bauxite mine as an example,the soil organic matter, total nitrogen, phosphorus, potassium, pH, moisture content, bulk density and EC were selected as appraising indexes. Due to Pingguo bauxite mine has taken into consideration during the land reclamation operations on soil mechanical rolling, this paper ignores the soil compaction indicator. Pingguo bauxite mine has constructed the efficient reclamation demonstration zones since 1999. Soil samples from five different demonstration areas of 1 year, 3 years, 5 years, 7 years and 9 years, respectively, were collected to evaluate soil quality at different levels, and Matlab7.0 was used to analyze the data. The results show that the soil quality is quite different in different efficient reclamation demonstration zones. The cash crops and sugar cane are better model soils, the vegetables and cassava take second place and the eucalyptus demonstration area is poor. As the reclamation time longer, the soil quality is better, but the eucalyptus appears abnormal phenomenon. The soil quality improvement in the eucalyptus demonstration area should to be investigated further.