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林业科学 ›› 1995, Vol. 31 ›› Issue (4): 299-309.

• 论文 • 上一篇    下一篇

火炬松人工林林木营养特性的研究*

费世民   

  1. 四川省林业科学研究院 成都 610081
  • 收稿日期:1994-02-07 出版日期:1995-07-25 发布日期:1995-07-25

STUDY ON NUTRIENT CHARACTERlSTlCS OF THE FOREST TREE IN A LOBLOLLY PINE PLANTATION

Shimin Fei   

  1. Forestry Academy of Sichuan Province Chengdu 610081
  • Received:1994-02-07 Online:1995-07-25 Published:1995-07-25

摘要:

通过试验控制、定位观测和养分元素分析测定,定量地研究了江苏省下蜀林场15年生火炬松人工林林木矿质营养特征,结果表明:(1)叶的N、P、K元素含量在林木同一个体的不同树冠方位、层次和不同个体间的变化中,仅P元素在层次间和K元素在不同个体间有显著差异;(2)老叶的N、P、K和Mg元素含量季节动态呈上升(生长季节到来时的“承启”作用)一下降型,Ca元素含量则略有上升;新抽出的嫩叶N,P,K元素含量较高,Ca、Mg则较低,此后,N、P、K元素含量呈上升一平稳一下降型,Mg元素含量呈上升一相对稳定型,Ca元素则呈持续上升型;(3)枝、干、皮和根中营养元素含量有明显的季节变化;(4)林木各组分养分元素含量呈叶 > 枝 > 根 > 干 > 皮。

关键词: 火炬松人工林, 营养元素, 空间变异, 季节动态

Abstract:

The results from a quantitative study on the nutrient characteristics of the forest trees in a 15-year-old Pinus taeda plantation, located in Xiashu Forest Farm, Jiangsu Province by experimental control fixed position observation, and analysis of nutrient elements, show that (1) There is only a significant difference in P element among different layers of tree corwn, and in K element among various individual plants; (2) The seasonal dynamics changes in the contents of N, P, K, and Mg elements have a pattern of increase-decrease, however the cont entof Ca element enhance slightly.The contents of N, P, K in new shoots are relatively high, that of Ca, Mg is low, hereafter the contents of N, P, K have a pattern of incresae-constant-decrease, the content of Mg has a pattern of increase-relatively constant, Ca element is in a sustained increase status; (3) There is a significant seasonal change in the contents of nutrient elements in branch, stem, bark and root; (4) The nutrient element contents in different parts of forest tree are in a rank of leaf > branch > root > stem > bark.

Key words: Pinus taeda planation, Nutrient element, Spacial variation, Seasonal dynamics