ABSTRACT

We investigated abundance and community structure of soil microarthropods in three stages of a primary successional chronosequence along the Tanana River in interior Alaska: early-successional alder stands, mid-successional balsam poplar stands and late successional white spruce stands. Microarthropod abundances in alder stands were uniformly low and tended to increase in balsam popular stands where abundances were highly variable among sites. White spruce stands had the highest abundances, almost 8 times those of alder sites. Arthropod taxon and Oribatida family richness also increased (alder: 29 taxa, 6 families; balsam poplar: 34 taxa, 10 families; white spruce: 40 taxa, 14 families). Non-metric multidimensional ordination of arthropod taxa indicated microarthropod communities became more similar within stand types later in succession and environmental fit of the site characteristics found organic matter thickness, soil degree days, organic layer phosphorus (P), mineral layer concentrations of carbon (C), nitrogen (N), and manganese (Mn), and white spruce basal area were significant (p < 0.05). Regression analysis indicated prey abundance and predator abundance were positively correlated (R² = 0.43; p< 0.001). Our findings point to the importance of vegetation, soil development and temperature, site stability, microarthropod colonization time, and possibly predator abundance in shaping these microarthropod communities.

摘要

我们研究了阿拉斯加内部塔纳纳河沿岸主要演替时序的三个阶段中土壤微节肢动物的丰度和群落结构：早期al木林，中部苦瓜白杨林林木和后期白云杉林木。der木林中节肢动物的丰度一直较低，并且在香脂流行林中的节肢动物中丰度变化很大，并且倾向于增加。白色云杉林的丰度最高，几乎是al木遗址的8倍。节肢动物的分类单元和Oribatida家庭的财富也增加了（al木：29个分类单元，6个家庭；苦瓜：34个分类单元，10个家庭；白云杉：40个分类单元，14个家庭）。节肢动物类群的非度量多维排序表明，微节肢动物群落在后来的林分类型内变得更加相似，并且该地点特征的环境适应性发现了有机物厚度，土壤度数天，有机层磷（P），矿物质层碳（C ），氮（N）和锰（Mn）以及白云杉的基部面积均显着（p <0.05）。回归分析表明猎物的丰度和捕食者的丰度呈正相关（R²  = 0.43；p <0.001）。我们的发现指出，在塑造这些微型节肢动物群落的过程中，植被，土壤发育和温度，站点稳定性，微型节肢动物定殖时间以及捕食者丰富度的重要性。