Leaf Litter Chemistry Drives the Structure and Composition of Soil Testate Amoeba Communities in a Tropical Montane Rainforest of the Ecuadorian Andes
Leaf Litter Chemistry Drives the Structure and Composition of Soil Testate Amoeba Communities in a Tropical Montane Rainforest of the Ecuadorian Andes
复制标题
DOI：
10.1007/s00248-017-0980-4
复制
发表时间：
2017-04
影响因子：
3.6
通讯作者：
Valentyna Krashevska;D. Sandmann;Franca Marian;M. Maraun;S. Scheu
中科院分区：
文献类型：
--
作者：
Valentyna Krashevska;D. Sandmann;Franca Marian;M. Maraun;S. Scheu
我们调查的作用，落叶化学和丰富的影响有遗嘱的变形虫群落在厄瓜多尔安第斯山脉的热带雨林。含有来自四种主要树种（Clusiasp.，在海拔2000 m的条件下，建立了丰富度分别为1、2和4种的Myrcia pubescens、Graffenrieda embryata和Cecropia andina），并在野外暴露12个月。在暴露前，分析了凋落叶的化学元素和化合物。在曝光结束时，微生物生物量和凋落物质量损失进行了测量，活的有巢阿米巴物种数量，密度，生物量和群落组成进行了测定。总共有125种有遗嘱的变形虫在垃圾袋中定居。结果表明，高凋落物氮和低木质素浓度是高凋落物质量的有壳阿米巴密度和物种丰富度的指标。其物种数和密度均呈1 > 4 > 2叶凋落物种的顺序显著下降，且随凋落物化学性质的变化而变化，高质量的单叶凋落物种最多，低质量的单叶凋落物种最少。此外，除了高质量的凋落物，以低质量的凋落物增加有壳阿米巴生物量和密度，但是，该值并没有超过在单一的高质量的凋落物处理。此外，有壳变形虫群落的结构与凋落物化学，铁，钠，木质素，和凋落物的C-到-N的比例是非常重要的，并表明凋落物化学反映生境质量的有壳变形虫。总体而言，数据表明，叶凋落物化学覆盖叶凋落物丰富的结构有遗嘱的阿米巴群落。
We investigated the role of leaf litter chemistry and richness in affecting testate amoeba communities of tropical rainforest in the Ecuadorian Andes. Litterbags containing leaf litter from four dominating tree species (Clusiasp.,Myrcia pubescens,Graffenrieda emarginata, andCecropia andina) with richness 1, 2, and 4 species were established and exposed in the field for 12 months at 2000 m a.s.l. Chemical elements and compounds of leaf litter were analyzed before exposure. At the end of exposure, microbial biomass and litter mass loss were measured, and living testate amoeba species number, density, biomass, and community composition were determined. In total, 125 testate amoeba species colonized the litter in litterbags. The results suggest that high litter nitrogen and low lignin concentrations are indicators of high litter quality for testate amoebae density and species richness. Their species number and density significantly declined in the order 1 > 4 > 2 leaf litter species and varied with leaf litter chemistry being at a maximum in high-quality single leaf litter species and low in low-quality leaf litter. Further, the addition of litter of high-quality to low-quality litter increased testate amoebae biomass and density; however, the values did not exceed the ones in single high-quality litter treatments. Moreover, the structure of testate amoeba communities varied with litter chemistry, with Fe, Na, lignin, and litter C-to-N ratio being of major importance, and indicating that litter chemistry reflects habitat quality for testate amoebae. Overall, the data show that leaf litter chemistry overrides leaf litter richness in structuring testate amoeba communities.