Altitude and decomposition stage rather than litter origin structure soil microarthropod communities in tropical montane rainforests
Altitude and decomposition stage rather than litter origin structure soil microarthropod communities in tropical montane rainforests
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DOI：
10.1016/j.soilbio.2018.07.017
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发表时间：
2018-10
影响因子：
9.7
通讯作者：
Franca Marian;D. Sandmann;Valentyna Krashevska;M. Maraun;S. Scheu
中科院分区：
文献类型：
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作者：
Franca Marian;D. Sandmann;Valentyna Krashevska;M. Maraun;S. Scheu
微型节肢动物通过处理以凋落物和根系分泌物形式进入土壤的有机物质来影响有机物质周转和养分循环。土壤微型节肢动物群落结构的变化是由于生物和非生物因素，如当地的气候条件和凋落物质量。然而，特别是在热带生态系统中，这些因素对土壤微型节肢动物群落结构的相对重要性知之甚少。我们调查了土壤微型节肢动物群落结构的变化，叶和根凋落物暴露在三个不同海拔高度的热带山地雨林在厄瓜多尔南部的三年。在不同海拔高度的3个样地采集了3种丰富树种的凋落叶和不同直径的根系。1000、2000、3000米）。凋落物和根被放置在垃圾袋在三个海拔高度，并在6，12，24和36个月后，在垃圾袋中的土壤微型节肢动物进行了分析。阿卡里和弹尾目的密度，和甲螨的多样性随着海拔的升高而降低，并与凋落物分解的程度而不是凋落物的来源，因此凋落物材料的质量。凋落物分解过程中密度波动一般是最低的24个月后，但36个月后较高。甲螨的种类组成随海拔高度变化很大，只有少数种类在不同海拔高度之间重叠。孤雌生殖甲螨种类的比例随海拔的升高而降低。结果表明，凋落物的来源，因此质量是不重要的驱动因素的热带山地雨林的微型节肢动物群落的组成。在不同海拔的雨林站点之间的因素变化，以及凋落物的分解阶段和微生物群落的相关变化是更重要的。
Microarthropods impact organic matter turnover and nutrient cycling via processing of organic matter entering the soil as litter and root exudates. Variations in the structure of soil microarthropod communities are due to both biotic and abiotic factors such as local climatic conditions and litter quality. However, in particular in tropical ecosystems the relative importance of these factors for structuring soil microarthropod communities are little understood. We investigated variations in the structure of soil microarthropod communities in leaf and root litter from three altitudes exposed in three tropical montane rainforests at different altitude in southern Ecuador for three years. Leaf litter from three abundant tree species and roots of different diameter were collected from three sites at different altitude (ca. 1000, 2000, 3000 m). Litter and roots were placed in litterbags at the three altitudes, and after 6, 12, 24 and 36 months soil microarthropods in the litterbags were analysed. Density of Acari and Collembola, and diversity of Oribatida decreased with increasing altitude and varied with the degree the litter was decomposed rather than with litter origin and therefore quality of the litter material. Densities fluctuated during litter decomposition generally being lowest after 24 months but higher after 36 months. Species composition of Oribatida varied strongly with altitude; only few species overlapped between altitudes. The percentage of parthenogenetic Oribatida species decreased with increasing altitude. The results suggest that the origin and therefore quality of litter material is of little importance as driving factor for the composition of microarthropod communities of tropical montane rainforests. Factors changing between rainforest sites at different altitude, as well as decomposition stage of litter and associated changes in the microbial community are much more important.