广西七坡林场3个乡土阔叶树种幼林地土壤养分分析

摘要

The soil nutrient of Castanopsis hystrix, Castanopsis fissa and Acrocarpus fraxinifolius young plantations established in Qipo forest farm of Guangxi were studied. The following results were achieved: 1) Establishment of plantations of these three indigenous species could significantly enhance the nutrient contents in soil, there were significant difference on organic matter, available N, available B, available Mn and available Fe between different tree species; 2) The maximum and minimum variation coefficients were Mn content and pH, which were 115. 60 % and 4. 34 % respectively; 3 ) There were both mutual promotion and mutual antagonism among soil nutrient elements ; 4) The contents of organic matter and nitrogen were abundant, the contents of available P and available K were relatively poor, the contents of available Cu and Mn were very poor, the available Zn and B were medium or slightly low, and the content of available Fe was too high.%通过对广西七坡林场红锥、大叶栎和顶果木幼林地土壤养分进行测定,对照造林前的土壤养分含量及土壤养分分级标准进行分析研究,结果表明,(1)营造3种乡土阔叶树种能大幅提高土壤主要养分含量,树种间土壤有机质含量、速效N含量、有效B含量、有效Mn含量、有效Fe含量存在显著差异(P＜0.05)；(2)土壤有效Mn含量变异系数最大(115.60％)、pH值变异系数最小(4.34％)；(3)土壤养分之间既有相互协同促进作用也有相互抗拮作用；(4)幼林地土壤有机质含量和速效N含量达到丰富水平,速效P含量和速效K含量则较为贫乏,有效Cu含量和有效Mn含量均处于贫乏或极贫的程度,有效Zn含量和有效B含量处于中等偏低的水平,有效Fe含量处于过高的水平.