Roots, mycorrhizal fungi and altitude as determinants of litter decomposition and soil animal communities in tropical montane rainforests
Roots, mycorrhizal fungi and altitude as determinants of litter decomposition and soil animal communities in tropical montane rainforests
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DOI：
10.1007/s11104-019-03999-x
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发表时间：
2019-05
期刊：
影响因子：
4.9
通讯作者：
Franca Marian;L. Brown;D. Sandmann;M. Maraun;S. Scheu
中科院分区：
文献类型：
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作者：
Franca Marian;L. Brown;D. Sandmann;M. Maraun;S. Scheu
AimsThis study assessed the importance of root- and mycorrhiza derived resources for decomposition processes and as food resources for microarthropod communities沿着a altitudinal gradient of tropical montane rainforests in southern Ecuador. Methods在1000，2000和3000 m microcosm的不同网眼大小的开口的缩影（4 mm，45 μm）或封闭暴露在田间，操纵根和菌根真菌的可及性。微宇宙包含未受干扰的土壤，其中混合了来自微宇宙暴露地点的三种丰富植物物种的落叶。经过12个月的含水量，微生物生物量，剩余的凋落物质量，C/N比和土壤微型节肢动物群落structures. Results含水量和C/N比较低，微生物生物量最高的最低海拔，而凋落物分解和微型节肢动物丰度在中间海拔最大。排除根和菌根真菌并没有影响凋落物的分解，但减少了甲螨的丰度和多样性，而丰富的弹尾目增加在封闭microcosms.ConclusionsThe根和菌根排除对所有调查参数的效果没有不同的三个海拔高度之间。结果表明，在营养有限的热带山地雨林中，菌根真菌抑制其他微生物的活动，可能竞争凋落物来源的资源，在每个调查的海拔高度。弹尾目从这种减少的竞争中受益，而甲螨目强烈依赖于根源性资源。
AimsThis study assesses the importance of root- and mycorrhiza-derived resources for decomposition processes and as food resources for microarthropod communities along an altitudinal gradient of tropical montane rainforests in southern Ecuador.MethodsAt 1000, 2000 and 3000 m microcosms with openings of different mesh sizes (4 mm, 45 μm) or closed were exposed in the field, manipulating accessibility by roots and mycorrhizal fungi. The microcosms contained undisturbed soil with a mixture of leaf litter from three abundant plant species from the site at which the microcosms were exposed. After 12 months water content, microbial biomass, remaining litter mass, C-to-N ratio and the soil microarthropod community structure were analysed.ResultsWater content and C-to-N ratio were lower and microbial biomass was highest at the lowest altitude, while litter decomposition and microarthropod abundance were at a maximum at the intermediate altitude. Exclusion of roots and mycorrhizal fungi did not affect litter decomposition, but decreased the abundance and diversity of Oribatida, while the abundance of Collembola increased in closed microcosms.ConclusionsThe effect of root and mycorrhizal exclusion on all investigated parameters did not differ between the three altitudes. The results indicate that in nutrient limited tropical montane rainforests mycorrhizal fungi suppress the activity of other microorganisms, potentially competing for litter-derived resources, at each of the investigated altitudes. Collembola benefitted from this reduced competition while Oribatida strongly depended on root-derived resources.