Neighborhood predictors of interspecific competition in young Douglas-fir plantations
Neighborhood predictors of interspecific competition in young Douglas-fir plantations
复制标题
年轻花旗松人工林种间竞争的邻域预测因子
DOI：
10.1139/x91-115
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发表时间：
1991
影响因子：
2.2
通讯作者：
S. Radosevich
中科院分区：
文献类型：
--
作者：
R. Wagner;S. Radosevich
以4 ~ 9年生花旗松（Pseudotsugamenziesii（Mirb.）Franco）是从俄勒冈州海岸山脉的场地准备实验中开发出来的。研究了多度、高度、距离、干旱空间配置等因素对苗木生长的影响。定义了最佳邻域高度和半径。预测花旗松树高和茎粗的最佳种间竞争指数是2.1 m半径范围内所有木本树种的总覆盖率。视觉估计的邻居覆盖上级冠面积的客观措施。木本植物的覆盖度等于或超过树高时，对树高的预测效果最好。木本植物的盖度等于或大于树高的一半是预测树干直径的最佳指标。考虑到邻近地区的空间分布
Neighborhood models describing the effect of interspecific competition on the height and stem diameter of 4- to 9-year-old saplings of Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) were developed from site-preparation experiments in the Oregon Coast Range. The influence of abundance measures, height, distance, arid spatial arrangement of nonconiferous woody plants surrounding individual saplings was examined. Optimum neighborhood heights and radii were defined. The best interspecific competition index for predicting Douglas-fir height and stem diameter was total percent cover for all woody species within a 2.1-m radius. Visual estimates of neighbor cover were superior to objective measures of crown area. The cover of woody species equalling or exceeding the height of the tree provided the best prediction for tree height. Woody species cover equalling or exceeding one-half the height of the tree provided the best index for predicting stem diameter. Accounting for the spatial arrangement of neighboring ...