Variation in the ratio of shoot silhouette area to needle area in fertilized and unfertilized Norway spruce trees.
Variation in the ratio of shoot silhouette area to needle area in fertilized and unfertilized Norway spruce trees.
复制标题
受精和未受精的挪威云杉树枝条轮廓面积与针叶面积之比的变化。
DOI：
10.1093/treephys/15.11.705
复制
发表时间：
1995
期刊：
影响因子：
4
通讯作者：
H. Smolander
中科院分区：
文献类型：
--
作者：
Pauline Stenberg;Sune Linder;H. Smolander
我们比较了施肥和未施肥（对照）挪威云杉（欧洲云杉（L.）喀斯特）。树我们测量了SPAR的几个视图方向的169个芽在不同深度的施肥和对照树的树冠。有一个增加的SPAR与深度在树冠中的控制和施肥树。然而，在施肥的树木，平均SPAR整体较大，增加与深度的冠是陡峭的，有一个较大的变化，SPAR与倾斜和旋转角度的拍摄（相对于视图方向）。特别是，在较低的冠施肥树的芽旋转不对称（“平”），并有很高的值的最大比率拍摄剪影面积投影叶面积（SPAR（最大））。施肥和对照树之间的SPAR的差异被解释为在响应施肥和遮荫的拍摄结构的变化。施肥树的新梢比对照树的新梢更大，针叶面积更大。然而，针叶面积的比例，拍摄大小是较小的施肥树比对照树，这意味着更少的拍摄内阴影，因此，一个更大的SPAR。此外，增加SPAR与增加阴影（深度在冠）可以解释由针叶面积的比例下降，拍摄大小。此外，因为施肥树有更多的针叶面积比对照树，在树冠中的一个给定的深度的阴影的效果是更显着的施肥树比对照树。
We compared the range and variation in shoot silhouette area to projected leaf area ratio (SPAR) in fertilized and unfertilized (control) Norway spruce (Picea abies (L.) Karst.) trees. We measured SPAR for several view directions of 169 shoots at different depths in the crown of fertilized and control trees. There was an increase in SPAR with depth in the crown in both control and fertilized trees. In the fertilized trees, however, mean SPAR was larger overall, the increase with depth in the crown was steeper, and there was a larger variation in SPAR with inclination and rotation angle of the shoot (relative to the view direction). In particular, shoots in the lower crown of fertilized trees were rotationally asymmetrical ("flat") and had high values of the maximum ratio of shoot silhouette area to projected leaf area (SPAR(max)). Differences in SPAR between fertilized and control trees were explained by changes in shoot structure in response to fertilization and shading. Shoots of fertilized trees were larger and had more needle area than shoots of control trees. However, the ratio of needle area to shoot size was smaller in fertilized trees than in control trees, implying less within-shoot shading and, consequently, a larger SPAR. Also, the increase in SPAR with increased shading (depth in the crown) could be explained by a decrease in the ratio of needle area to shoot size. In addition, because fertilized trees had more needle area than control trees, the effect of shading at a given depth in the crown was more pronounced in fertilized trees than in control trees.