【摘要】 为了探讨树体养分(N、P、K)的质量含量是否受空间距离的影响,以便为林地养分管理和种植密度的选择提供理论依据.本试验研究了2种空间距离(株行距1.5m×2.5m和1.5m×5.0m)下桉树(刚果12号W5无性系)单株树木的生长和树体各器官N、P、K质量含量的变化规律.结果表明:随着空间距离增大了一倍,胸径、高和生物量明显增加;除了叶部P、K和皮部K外,其他树体器官的N、P、K质量含量均有所增加;在树体养分N、P、K的平均质量含量中,N的质量含量增加值最大,且这种增加值主要来自干部的质量含量;空间距离对N、P养分的质量含量的影响较大.因此认为:合理确定种植密度对林地养分管理具有重要的理论和实践意义.更多还原

【Abstract】 To provide theoretical basis for managing forest soil nutrients and selecting planting density, a study on masscontents of nutrients-N, P, K in Eucalyptus ABL12 was conducted to explore whether they were affected by spacing. For this reason, the growth of Eucalyptus ABL12’s single tree and the varying law of masscontent of N, P, K in different parts of the tree were investigated through 2 spacings (row spacing 1.5 m×2.5 m and 1.5 m×5.0 m ). As the spacing was doubled, the results showed that the growth increased significantly in diameter at breast height, breast height, and biomass; and all the masscontents of N, P, K in other parts of tree increased except that of P and K in leaves and that of K in bark; in addition, among the average values of N, P, K masscontents of the tree, the increased value in N masscontent was the highest, meantime, nutrient content of stem contributed a large part to that increase, and the spacing had a great effect on the masscontents of N and P nutrient. Hence the authors thought that to determine planting density reasonably had great significance in theory and practice for managing forest soil nutrient.更多还原