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作 者 ：费世民

期 刊 ：林业科学 1995年 31卷 4期 页码：299-309

关键词：火炬松人工林；营养元素；空间变异；季节动态；

Keywords:Pinustaedaplantation, Nutrient element, Spaclal variation, Seasonal dynamics,

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。

Abstract:The results from a quantitative study on the nutrient characteristics of
the forest trees in a 15一year-old Pinus taeda plantation，located in Xiashu
Forest Farm，Jiangsu Province by experimental control fixed position obser—
vation，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 in—
crease—decrease,however the cont entof Ca element enhance slightly．The CO—
ntents 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—
decreasethe content of Mg has a pattern of increase—relatively constant，Ca
element is in a sustained increase status) (3)There is a significant seaso—
nal 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．

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