CANOPY ARTHROPOD RESPONSE TO DENSITY AND DISTRIBUTION OF GREEN TREES RETAINED AFTER PARTIAL HARVEST
CANOPY ARTHROPOD RESPONSE TO DENSITY AND DISTRIBUTION OF GREEN TREES RETAINED AFTER PARTIAL HARVEST
复制标题
冠层节肢动物对部分采伐后保留的绿树密度和分布的反应
DOI：
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
R. Progar
中科院分区：
文献类型：
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作者：
T. Schowalter;I. Y. Zhang;R. Progar
作为生态系统管理方案示范（DEMO）研究的一部分，我们测量了俄勒冈州西部和华盛顿州六个地点（街区）的冠层节肢动物对六种对比绿树保留处理的反应。处理为 100go 保留（未切割）、三个 1 公顷收获间隙的 75% 保留、40% 分散保留、5 个 1 公顷未切割骨料的 40% 聚集保留、15% 分散保留和 2 个 1 公顷未切割骨料的 15% 聚集保留。每年 6 月和 8 月，从每个处理单元的一棵上层花旗松 (Pseudotsuga menziesii (Mirb.) Franco) 和三棵林下藤本枫树 (Acer circinatum Pursh) 的上层、中层和下层树冠处采集节肢动物样本，以评估丰度的季节变化。处理前数据收集于 1996 年，处理后数据收集于 1999-2000 年。节肢动物几乎没有显示出对处理有反应的证据，但两种植物物种的节肢动物丰度在不同区块之间表现出显着差异，反映了区域尺度上对环境梯度的响应。在未操纵（对照）处理中，节肢动物丰度也随着时间的推移而显着变化，这表明对每年天气变化的敏感性。我们的结果表明，这种强度或规模的干扰在短期内对冠层节肢动物影响不大。未来有必要进行采样，以评估节肢动物对这些处理在较长时间内造成的环境条件变化的反应程度。
We measured canopy arthropod responses to six contrasting green-tree re- tention treatments at six locations (blocks) in western Oregon and Washington as part of the Demonstration of Ecosystem Management Options (DEMO) study. Treatments were lOOgo retention (uncut), 75% retention with three 1-ha harvested gaps, 40% dispersed retention, 40% aggregated retention with five 1-ha uncut aggregates, 15% dispersed reten- tion, and 15% aggregated retention with two 1-ha uncut aggregates. Arthropods were sam- pled from upper, mid-, and lower crown levels of one overstory Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) and from three understory vine maple (Acer circinatum Pursh) in each treatment unit during June and August each year to assess seasonal variation in abundances. Pretreatment data were collected in 1996 and posttreatment data in 1999- 2000. Arthropods showed little evidence of response to treatments, but the abundance of arthropods on both plant species showed significant variation among blocks, reflecting responses to environmental gradients at a regional scale. Arthropod abundance also varied significantly over time in unmanipulated (control) treatments, suggesting sensitivity to annual changes in weather. Our results suggest that disturbance at this intensity or scale has little influence on canopy arthropods in the short term. Future sampling will be necessary to evaluate the extent to which arthropods respond to changes in environmental conditions created by these treatments over longer time periods.
DOI：
10.1073/pnas.92.1.44
发表时间：
1995-01-03
影响因子：
11.1
作者：
ROELOFS, WL
通讯作者：
ROELOFS, WL