Changes in Forest Canopy Structure along a Site Quality Gradient in Southern Wisconsin
Changes in Forest Canopy Structure along a Site Quality Gradient in Southern Wisconsin
复制标题
威斯康星州南部沿场地质量梯度的森林冠层结构变化
DOI：
10.2307/2425486
复制
发表时间：
1982
影响因子：
0.6
通讯作者：
J. Melillo
中科院分区：
文献类型：
--
作者：
J. Aber;J. Pastor;J. Melillo
采用垂直点取样技术对威斯康星州南部13个林分的叶高剖面进行了测定。选择的地点代表了广泛的土壤和植被条件。排序的配置文件产生了一个连续的垂直结构平行的物种组成和土壤水分状况的连续变化。这些剖面用于检验不同水分胁迫水平下与净能量捕获相关的冠层结构假设。冠层的水分梯度的中端显示出假设的转变，从多层到单层的水分供应量增加。站在旱端的梯度包括一个显着的灌木层，导致基本上是一个双层结构的假设趋势的分歧。
The foliage-height profiles of 13 forest stands in southern Wisconsin were measured using a vertical point sampling technique. Sites were selected to repre- sent a wide range of soil and vegetational conditions. An ordination of profiles yielded a continuum in vertical structure paralleling a continuous change in species composition and soil moisture status. The profiles were used to test hypotheses on canopy structure relating to net energy capture under different levels of moisture stress. Canopies on the mesic end of the moisture gradient showed the hypothesized shift from multilayer to monolayer with increasing moisture availability. Stands on the xeric end of the gradient included a significant shrub layer which caused a divergence from the hypothesized trends leading essentially to a double layer structure.