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Production and turnover of mycorrhizal soil mycelium relate to variation in drought conditions in Mediterranean Pinus pinaster, Pinus sylvestris and Quercus ilex forests
New Phytologist ( IF 9.4 ) Pub Date : 2020-10-22 , DOI: 10.1111/nph.17012
Andreas Hagenbo 1, 2, 3, 4 , Yasmine Piñuela 2 , Carles Castaño 5 , Juan Martínez de Aragón 1 , Sergio de‐Miguel 1, 2 , Josu G. Alday 1, 2 , José Antonio Bonet 1, 2
Affiliation  

  • In forests, ectomycorrhizal mycelium is pivotal for driving soil carbon and nutrient cycles, but how ectomycorrhizal mycelial dynamics vary in ecosystems with drought periods is unknown. We quantified the production and turnover of mycorrhizal mycelium in Mediterranean Pinus pinaster, Pinus sylvestris and Quercus ilex forests and related the estimates to standardised precipitation index (SPI), to study how mycelial dynamics relates to tree species and drought‐moisture conditions.
  • Production and turnover of mycelium was estimated between July and February, by quantifying the fungal biomass (ergosterol) in ingrowth mesh bags and using statistical modelling. SPI for time scales of 1–3 months was calculated from precipitation records and precipitation data over the study period.
  • Forests dominated by Pinus trees displayed higher biomass but were seasonally more variable, as opposed to Q. ilex forests where the mycelial biomass remained lower and stable over the season. Production and turnover, respectively, varied between 1.4–5.9 kg ha−1 d−1 and 7.2–9.9 times yr−1 over the different forest types and were positively correlated with 2‐month and 3‐month SPI over the study period.
  • Our results demonstrated that mycorrhizal mycelial biomass varied with season and tree species and we speculate that production and turnover are related to physiology and plant host performance during drought.


中文翻译:

菌根土壤菌丝体的生产和周转与地中海松树,樟子松和栎栎森林干旱条件的变化有关

  • 在森林中,外生菌根菌丝体对于驱动土壤碳和养分循环至关重要,但是在干旱时期生态系统中外生菌根菌丝动力学是如何变化的仍是未知的。我们对地中海樟子松栎栎林中菌根菌丝体的产生和周转进行了量化,并将估算值与标准降水指数(SPI)相关联,以研究菌丝体动力学与树木种类和干旱湿润条件之间的关系。
  • 通过量化向内生长的网袋中的真菌生物量(麦角固醇)并使用统计模型,可以估算7月至2月之间菌丝体的产生和周转。根据研究期间的降水记录和降水数据,计算了1-3个月时间尺度的SPI。
  • 以森林为主的树木显示较高的生物量,但为季节性多变量,而不是Q。整个季节,菌丝体生物量保持较低且稳定的 冬青林。在不同的森林类型中,产量和营业额分别在1.4-5.9 kg ha -1  d -1和7.2 9.9倍yr -1之间变化,并且在研究期内与2个月和3个月SPI正相关。
  • 我们的结果表明,菌根菌丝体生物量随季节和树木种类而变化,并且我们推测产量和周转率与干旱期间的生理和植物寄主表现有关。
更新日期:2020-10-22
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