Temperatures at the margins of a young spruce stand in relation to aboveground height
Temperatures at the margins of a young spruce stand in relation to aboveground height
复制标题
DOI：
10.3832/ifor0815-006
复制
发表时间：
2013-07
期刊：
影响因子：
--
通讯作者：
O. Špulák;V. Balcar
中科院分区：
文献类型：
--
作者：
O. Špulák;V. Balcar
摘要：在Jizerske hory山（捷克共和国）的山顶附近的北方和南部边缘的年轻的挪威云杉林（树高约4.5米）在30，60，90和140厘米的地上监测空气温度。选择温度传感器的高度间隔来代表不同树高类别（幼苗、半树苗和树苗）的种植株中的终端芽高度。另一个监测的参考点是30厘米以上，在相邻的树木之间的立场差距。评价使用了2010年4月至10月和2011年4月至10月两个时期的测量数据。差异进行了评估的平均温度特性和最低温度的地面空气层的林隙，并在个别位置的立场边缘。代表温度极值（最小值、最大值、振幅）的值的差异显示出比平均值更明显的波动。林窗和云杉林分南缘的地面空气层（30 cm）的日温度特征过程中的差异较小。北方边缘的地面空气层明显较冷，温度变化也比较稳定。随着地面高度的增加，温度波动减小，地面霜冻的频率和强度也减小。在地面以上140厘米处（即，在云杉林分高度的三分之一处），在生长期内，南北北方林分边缘的日温度特征差异很小，晚霜和早霜的发生频率相当。总之，较高的风险，由于温度胁迫的小型种植股票的损害被证实为较高的海拔。对于幼林针叶林重建过程中的树苗种植，在一个小的皆伐区域内选择合适的种植位置并不具有这样的重要性，在终端拍摄附近的温度，因为它具有较小的尺寸种植股票。
Abstract: Air temperature was monitored at a summit of the Jizerske hory Mountains (Czech Republic) in the vicinity of the northern and southern margins of a young Norway spruce stand (tree height ca 4.5 m) at 30, 60, 90 and 140 cm aboveground. Height intervals of temperature sensors were selected to represent terminal shoot heights in the planting stock of different tree-height categories (seedlings, semi-saplings and saplings). Another monitored reference point was 30 cm aboveground in an adjacent treeless gap between stands. The evaluation utilized measurements taken in two periods, from April to October 2010 and 2011. Differences were evaluated in mean temperature characteristics and minimum temperatures for the ground air layer in the stand gap and in the individual locations at the stand margins. Differences in values representing temperature extremes (minimum, maximum, amplitudes) showed a more conspicuous fluctuation than did mean values. The difference in the course of daily temperature characteristics in the ground layer of air (at 30 cm aboveground) between the stand gap and the southern margin of the spruce stand was small. The ground layer of air at the northern margin was markedly colder and showed a more stable course of temperatures. Decreasing temperature fluctuation was observed also with increasing height aboveground, and the frequency and intensity of ground frosts also was decreasing. At 140 cm aboveground (i.e., at approximately one-third of the spruce stand’s height), the differences between daily temperature characteristics at the southern and northern stand margins were small during the growing period, and there was comparable frequency as to the occurrence of late or early frosts. In conclusion, higher risk of damage to small-sized planting stock due to temperature stress was confirmed for higher mountain elevations. For sapling plantings during reconstruction of young coniferous stands, the selection of a suitable planting location within a small clear-cut area does not have such importance in terms of temperatures near the terminal shoot as it has for planting stock of smaller dimensions.