2021
DOI: 10.1002/ecy.3328
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Nutrient limitation may induce microbial mining for resources from persistent soil organic matter

Abstract: Fungi and bacteria are the two principal microbial groups in soil, responsible for the breakdown of organic matter (OM). The relative contribution of fungi and bacteria to decomposition is thought to impact biogeochemical cycling at the ecosystem scale, whereby bacterially dominated decomposition supports the fast turnover of easily available substrates, whereas fungal-dominated decomposition leads to the slower turnover of more complex OM. However, empirical support for this is lacking. We used soils from a d… Show more

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Cited by 71 publications
(31 citation statements)
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“…These changes suggested a higher level of active biomass (Blagodatskaya & Kuzyakov, 2013), following conversion to agricultural land use, including manure addition practices, and thus faster C and nutrient turnover rates (Wardle et al., 2004). This indication of enhanced soil fertility was also consistent with the smaller reduction of gross N mineralization (Figure 3a) compared with that for respiration (Figure 2d), reducing the ratio of C mineralization to N mineralization from about 12 to 3 and suggesting a shift in microbial resource use from relatively nutrient‐poor to nutrient‐rich OM (Hicks et al., 2021; Murphy et al., 2015; Rousk et al., 2016). These shifts in microbial resource availability also stimulated gross nitrification rates (H6; Figure 3b).…”
Section: Discussionsupporting
confidence: 75%
“…These changes suggested a higher level of active biomass (Blagodatskaya & Kuzyakov, 2013), following conversion to agricultural land use, including manure addition practices, and thus faster C and nutrient turnover rates (Wardle et al., 2004). This indication of enhanced soil fertility was also consistent with the smaller reduction of gross N mineralization (Figure 3a) compared with that for respiration (Figure 2d), reducing the ratio of C mineralization to N mineralization from about 12 to 3 and suggesting a shift in microbial resource use from relatively nutrient‐poor to nutrient‐rich OM (Hicks et al., 2021; Murphy et al., 2015; Rousk et al., 2016). These shifts in microbial resource availability also stimulated gross nitrification rates (H6; Figure 3b).…”
Section: Discussionsupporting
confidence: 75%
“…First, fresh litter contains recalcitrant components (e.g., lignin and cellulose), which can be preferentially used by fungi (relative to bacteria) in the early stage of litter decomposition (Zhang et al, 2021). Second, as plant aboveground litter often has high C:N ratio (about 61.2 globally, Zechmeister‐Boltenstern et al, 2015), the addition of litter increased soil C:N ratio (Figure 2a) and can induce a lower N availability (relative to C), which generally favors fungal growth (Fierer et al, 2009; Hicks et al, 2021; Strickland & Rousk, 2010). Similar to litter addition, litter removal also increased fungal‐to‐bacterial ratio, likely because litter removal caused continuous losses of soil labile C (Figures 2 and 6b; Lajtha, Townsend, et al, 2014), and fungi can produce oxidative enzymes more efficiently than bacteria to decompose recalcitrant C to maintain their growth (Cusack et al, 2011).…”
Section: Discussionmentioning
confidence: 99%
“…Many researchers have found that soil microorganisms profoundly impact the growth, nutrition, and health of plants in agricultural ecosystems (Berendsen et al, 2012 ; Stephanie, 2018 ; Islam et al, 2020 ; Hicks et al, 2021 ). The quantity of soil microorganisms mainly reflects soil activity and its activity degree (Ma et al, 2017 ).…”
Section: Discussionmentioning
confidence: 99%