The ongoing climate change is characterized by increased temperatures and altered precipitation patterns In addition, there has been an increase in both the frequency and intensity of extreme climatic events such as drought Episodes of drought induce a series of interconnected effects, all of which have the potential to alter the carbon balance of forest ecosystems profoundly at different scales of plant organization and ecosystem functioning During recent years, considerable progress has been made in the understanding of how aboveground parts of trees respond to drought and how these responses affect carbon assimilation In contrast, processes of belowground parts are relatively underrepresented in research on climate change In this review, we describe current knowledge about responses of tree roots to drought Tree roots are capable of responding to drought through a variety of strategies that enable them to avoid and tolerate stress Responses include root biomass adjustments, anatomical alterations, and physiological acclimations The molecular mechanisms underlying these responses are characterized to some extent, and involve stress signaling and the induction of numerous genes, leading to the activation of tolerance pathways In addition, mycorrhizas seem to play important protective roles The current knowledge compiled in this review supports the view that tree roots are well equipped to withstand drought situations and maintain morphological and physiological functions as long as possible Further, the reviewed literature demonstrates the important role of tree roots in the functioning of forest ecosystems and highlights the need for more research in this emerging field

/pdf/how-tree-roots-respond-to-drought-1klh8d8v15.pdf

How tree roots respond to drought

Explaining the large-scale diversity of soil organisms that drive biogeochemical processes—and their responses to environmental change—is critical. However, identifying consistent drivers of belowground diversity and abundance for some soil organisms at large spatial scales remains problematic. Here we investigate a major guild, the ectomycorrhizal fungi, across European forests at a spatial scale and resolution that is—to our knowledge—unprecedented, to explore key biotic and abiotic predictors of ectomycorrhizal diversity and to identify dominant responses and thresholds for change across complex environmental gradients. We show the effect of 38 host, environment, climate and geographical variables on ectomycorrhizal diversity, and define thresholds of community change for key variables. We quantify host specificity and reveal plasticity in functional traits involved in soil foraging across gradients. We conclude that environmental and host factors explain most of the variation in ectomycorrhizal diversity, that the environmental thresholds used as major ecosystem assessment tools need adjustment and that the importance of belowground specificity and plasticity has previously been underappreciated.

/pdf/environment-and-host-as-large-scale-controls-of-1joiv18t3h.pdf

Environment and host as large-scale controls of ectomycorrhizal fungi

https://www.fs.fed.us/nrs/pubs/jrnl/2019/nrs_2019_lilleskov_001.pdf

Atmospheric nitrogen deposition impacts on the structure and function of forest mycorrhizal communities: A review.

https://ddd.uab.cat/pub/artpub/2019/200831/envpol_a2019m1v244p980.pdf

Responses of forest ecosystems in Europe to decreasing nitrogen deposition

How does forest management affect fungal diversity and community composition? Current knowledge and future perspectives for the conservation of forest fungi

Ectomycorrhizal fungi are major ecological players in temperate forests, but they are rarely used in measures of forest condition because large-scale, high-resolution, standardized and replicated belowground data are scarce. We carried out an analysis of ectomycorrhizas at 22 intensively monitored long-term oak plots, across nine European countries, covering complex natural and anthropogenic environmental gradients. We found that at large scales, mycorrhizal richness and evenness declined with decreasing soil pH and root density, and with increasing atmospheric nitrogen deposition. Shifts in mycorrhizas with different functional traits were detected; mycorrhizas with structures specialized for long-distance transport related differently to most environmental variables than those without. The dominant oak-specialist Lactarius quietus, with limited soil exploration abilities, responds positively to increasing nitrogen inputs and decreasing pH. In contrast, Tricholoma, Cortinarius and Piloderma species, with medium-distance soil exploration abilities, show a consistently negative response. We also determined nitrogen critical loads for moderate (9.5-13.5 kg N/ha/year) and drastic (17 kg N/ha/year) changes in belowground mycorrhizal root communities in temperate oak forests. Overall, we generated the first baseline data for ectomycorrhizal fungi in the oak forests sampled, identified nitrogen pollution as one of their major drivers at large scales and revealed fungi that individually and/or in combination with others can be used as belowground indicators of environmental characteristics.

Environmental drivers of ectomycorrhizal communities in Europe's temperate oak forests

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Environmental drivers of ectomycorrhizal communities in Europe's temperate oak forests