Aluminum extractability in red soils as influenced by land use patterns     

叶兰军  谢正苗  黄昌勇  徐建明 《浙江大学学报(A卷英文版)》2002,3(2):223-227

This study on the effect of land use on soil quality in relation to forms and toxicity of aluminum in red soils (Ultisol) in southeast China showed that in general, the extractable order for soil active aluminum by four extractants was: NaOH 0.5 mol/L > HCl 1 mol/L > NH4Ac 1 mol/L > KCl 1 mol/L . Different uses of the red soils, developed from Quarternary red clay with the similar hydrogeological environment, greatly affected the amount of active aluminum, especially the exchangeable Al3+. The order of exchangeable Al3+ (Al mg/kg) in the red soils with different land uses was: barren land (740) > tea garden (663) > peach garden (432) > citrus garden (234) > paddy soil (127). The content of water soluble aluminum in the red soils was highly sensitive to soil acidity.  相似文献   

研究生读书报告质量管理体系的研究与实践     

楼建悦  叶兰军  赵启泉 《黑龙江高教研究》2001,(4):122-123

针对近年来研究生读书报告的质量有所下降的现象，我们在管理上做了探索性研究，形成了一整套包括读书报告的组织、宣传、计划、质量评价指标、评分标准、奖惩措施等的读书报告管理体系。实践表明，该体系对提高研究生读书报告质量、培养研究生严谨的治学态度、规范读书报告量化管理等方面有积极的促进作用，具有重要的理论价值和相当的推广应用前景。  相似文献