Evaluation of soil nutrients under Eucalyptus grandis plantation and adjacent sub-montane rain forest

巨桉(Eucalyptus grandis)植被和其相邻的山地雨林中土壤营养的评价(英文)

A study was conducted to evaluate the status of soil nutrients under E. grandis plantation in comparison with that in its adjacent submontane rain forest. Twenty sequare plots, with an area of 20 m×20 m for each, were established in both of E.grandis plantation and its adjacent sub-montane rain forest, independently. Soil samples were collected from each square plot, at five points （at the four comers and at the center） of each plot. The collected soil samples were mixed to make a composite and representative sample for each plot, independently. The analyses were done in a soil laboratory following appropriate methods. The analysis result indicated that there were no significance differences between E. grandis plantation and its adjacent sub-montane rain forest in the level of major soil nutrients （total N, available P, exchangeable K, Ca and Mg）, pH and total carbon of soils （p 〈 0.05）. There were significance differences between two sites of forest soils in percentage of clay particles, and exchangeable Na content. E. grandis plantation was found improving soil nutrients and total carbon as compared with that of its adjacent submontane rain forest.

研究评价巨桉(Eucalyptus grandis)植被和其相邻的山地雨林中土壤营养状况。在研究地建立了20个样方,每个小样方为20mx20m。在每个小样方内对土壤进行5个样点的采样(4角和中心点)。把每个小样方的不同点采集的土样进行混合,并独立放置。分析结果表明,巨桉植被和其相邻的山地雨林中土壤指标(全N、有效P、可交换性K、Ca和Mg含量),pH值以及全碳含量)没有明显的变化。但两种林地土壤中的粘土颗粒和可交换性N含量有明显的变化。与巨桉植被相邻的山地雨林中土壤指标比较表明,巨桉植被有提高土壤营养和全碳含量的作用。