Differences in soil organic matter between EcM ‐ and AM ‐dominated forests depend on tree and fungal identity
Differences in soil organic matter between EcM ‐ and AM ‐dominated forests depend on tree and fungal identity
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EcM – 和 AM – 主导的森林之间土壤有机质的差异取决于树木和真菌的特性
DOI：
10.1002/ecy.3929
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发表时间：
2022
期刊：
影响因子：
4.8
通讯作者：
Wurzburger, Nina
中科院分区：
文献类型：
--
作者：
Hicks Pries, Caitlin E.;Lankau, Richard;Ingham, Grace Anne;Legge, Eva;Krol, Owen;Forrester, Jodi;Fitch, Amelia;Wurzburger, Nina
随着全球变化改变了森林的物种组成，我们需要了解哪些物种特征影响土壤有机质（SOM）循环，以预测未来的土壤碳(C)储量。最近，一个树种是否与丛枝真菌（AM）或外生菌根真菌（EcM）形成共生关系被认为是土壤碳储量的一个强有力的预测指标，但EcM系统内部存在很大的差异。在本研究中，我们研究了美国东部阔叶林生物群系中代表不同气候和树木群落的4个地点的菌根组合、冠层树木和菌根真菌的物种组成与土壤C和氮(N)在矿物组合和土壤C:N中所占比例的关系。在我们的两个站点中，我们发现随着与EcM相关的树木基底面积的增加，矿物相关的C和N下降与土壤C:N比值增加的预期关系。然而，在所有地点，这些土壤性质与冠层树木和真菌物种组成密切相关。观察到EcM基面积的预期模式的地点：(1)主要是松科和壳斗科的低质量凋落物树木；(2)主要是具有中距离探索型菌丝、黑化组织和产生过氧化物酶潜力的EcM真菌。这项观察性研究表明，AM和EcM系统之间SOM的差异取决于树木和EcM真菌的分类群。当丰富的菌根共生被简化为两类时，重要的信息就丢失了。
As global change shifts the species composition of forests, we need to understand which species characteristics affect soil organic matter (SOM) cycling to predict future soil carbon (C) storage. Recently, whether a tree species forms a symbiosis with arbuscular (AM) versus ectomycorrhizal (EcM) fungi has been suggested as a strong predictor of soil C storage, but there is wide variability within EcM systems. In this study, we investigated how mycorrhizal associations and the species composition of canopy trees and mycorrhizal fungi related to the proportion of soil C and nitrogen (N) in mineral associations and soil C:N across four sites representing distinct climates and tree communities in the eastern US broadleaf forest biome. In two of our sites, we found the expected relationship of declining mineral‐associated C and N and increasing soil C:N ratios as the basal area of EcM‐associating trees increased. However, across all sites these soil properties strongly correlated with canopy tree and fungal species composition. Sites where the expected pattern with EcM basal area was observed were (1) dominated by trees with lower quality litter in the Pinaceae and Fagaceae families and (2) dominated by EcM fungi with medium‐distance exploration type hyphae, melanized tissues, and the potential to produce peroxidases. This observational study demonstrates that differences in SOM between AM and EcM systems are dependent on the taxa of trees and EcM fungi involved. Important information is lost when the rich mycorrhizal symbiosis is reduced to two categories.