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首页> 外文期刊>Plant and Soil >Red oak litter promotes a microarthropod functional group that accelerates its decomposition.
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Red oak litter promotes a microarthropod functional group that accelerates its decomposition.

机译：赤栎凋落物促进了一种节肢动物官能团，可加速其分解。

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摘要

The effect of litter type and complexity on the diversity and species composition of oribatid mites, and whether alterations in species composition due to litter type affect litter decomposition were studied in an array of plots on a mixed-hardwoodsite in the mountains of North Carolina, USA. Microarthropod assemblages were exposed to a range of litter types: yellow birch [Betula alleghaniensis], sugar maple [Acer saccharum], red oak [Quercus rubra] and two mixed litters. Over several years, the litter types selected oribatid mite assemblages of different species composition. By comparing the decomposition of consecutive cohorts of litter, it was possible to detect differences in decomposition accompanying the shifts in the assemblage. A comparison of the mass loss rates between the two litter cohorts over eighteen months showed similar trajectories for four litter types. In the oak litter, however, the second cohort disappeared significantly faster than the first. In both years, the litters came from the same trees and were nearly identical in initial carbon and nitrogen contents. Since the response was specific to oak litter, it is unlikely that differences in environmental factors are responsible for the faster mass loss of oak. A significant increase of endophagous oribatid mites, those that burrow into plant material, in the second cohort of oak may account for its accelerated decomposition. The woody petioles and thick leaf-planes of oak leaves provide microhabitats for burrowing mites.Endophage activity can accelerate the litter decomposition both through direct comminution of leaf material and by facilitating microbial growth. Because of their low population growth rates, oribatid populations that are reduced by disturbance are slowto recover and by disrupting these non-resilient populations, disturbance may have long-term repercussions for decomposition.
机译：在美国北卡罗莱纳州山区的一块混合硬木地块上研究了凋落物类型和复杂性对鸟蝠螨多样性和物种组成的影响，以及由于凋落物类型引起的物种组成变化是否影响凋落物分解。 。将微型节肢动物组合暴露于各种凋落物类型：黄桦树（Betula alleghaniensis），糖枫树（Acer saccharum），赤栎树（Quercus rubra）和两个混合凋落物。在过去的几年中，猫砂类型选择了具有不同物种组成的鸟螨螨组合。通过比较连续队列的凋落物分解，可以检测伴随组合变化的分解差异。对两个窝群在18个月内的质量损失率进行比较，结果显示了四种窝类型的轨迹相似。但是，在橡树垃圾中，第二组的消失速度明显快于第一组。在这两年中，凋落物都来自同一棵树，其初始碳和氮含量几乎相同。由于响应是特定于橡木垫料的，因此环境因素的差异不太可能导致橡木质量的快速下降。在第二批橡树中，吞噬植物材料的内吞oribatid螨的大量增加可能是其加速分解的原因。木质叶柄和橡树叶的厚叶平面为穴居螨虫提供了微生境。内吞噬菌体的活动可通过直接粉碎叶片材料和促进微生物生长来加速凋落物的分解。由于其人口增长率低，被干扰减少的原核生物种群恢复较慢，并且通过破坏这些非弹性种群，干扰可能会对分解产生长期影响。

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