Nutrient enrichment effects on mycorrhizal fungi in an Andean tropical montane Forest
Nutrient enrichment effects on mycorrhizal fungi in an Andean tropical montane Forest
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DOI：
10.1007/s00572-016-0749-5
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发表时间：
2017-05-01
期刊：
影响因子：
3.9
通讯作者：
Queenborough, Simon A.
中科院分区：
文献类型：
--
作者：
Delavaux, Camille S.;Camenzind, Tessa;Queenborough, Simon A.
氮(N)和磷(P)沉降在世界范围内增加，主要是由于化肥使用增加和化石燃料燃烧。大多数关于自然生态系统中氮磷沉积的工作都集中在温带、高度工业化地区。热带地区正变得更加发达，将大量的这些营养物质释放到大气中。在热带山地森林等营养贫乏的系统中，养分的富集可能代表养分有效性的相对较大的变化，特别是对于丛枝菌根真菌（AMF）等敏感微生物而言。这些共生真菌尤其重要，因为它们在影响植物群落结构和功能的生态系统过程中起着关键作用。为了更好地了解植物群落营养沉积的后果，在厄瓜多尔南部安第斯山脉的热带山地森林中进行了长期营养添加实验。在本研究中，我们通过温室诱捕法研究了7年高氮、高磷处理对AMF根定植势（AMF- rcp）的影响。我们还研究了AMF-RCP与稀有树木多样性之间的关系。增肥7年后，AMF-RCP与土壤P呈负相关，与土壤N呈正相关，与稀有树种多样性呈正相关。研究结果表明，该热带山地森林的土壤有机质丰度受土壤氮、磷浓度的直接影响，但也可能受到稀有树种多样性变化的间接影响。我们的研究还强调，需要充分了解使用不同采样方法（例如，AMF-RCP与直接根采样）的优点和缺点，以便在未来强有力地检查amf -植物相互作用。
Nitrogen (N) and phosphorus (P) deposition are increasing worldwide largely due to increased fertilizer use and fossil fuel combustion. Most work with N and P deposition in natural ecosystems has focused on temperate, highly industrialized, regions. Tropical regions are becoming more developed, releasing large amounts of these nutrients into the atmosphere. Nutrient enrichment in nutrient-poor systems such as tropical montane forest can represent a relatively large shift in nutrient availability, especially for sensitive microorganisms such as arbuscular mycorrhizal fungi (AMF). These symbiotic fungi are particularly critical, given their key role in ecosystem processes affecting plant community structure and function.To better understand the consequences of nutrient deposition in plant communities, a long-term nutrient addition experiment was set up in a tropical montane forest in the Andes of southern Ecuador. In this study, we investigated the impacts of 7 years of elevated N and P on AMF root colonization potential (AMF-RCP) through a greenhouse bait plant method in which we quantified root colonization. We also examined the relationship between AMF-RCP and rarefied tree diversity.After 7 years of nutrient addition, AMF-RCP was negatively correlated with soil P, positively correlated with soil N, and positively correlated with rarefied tree diversity. Our results show that AMF in this tropical montane forest are directly affected by soil N and P concentrations, but may also be indirectly impacted by shifts in rarefied tree diversity. Our research also highlights the need to fully understand the benefits and drawbacks of using different sampling methods (e.g., AMF-RCP versus direct root sampling) to robustly examine AMF-plant interactions in the future.