Response of microbial respiration from fine root litter decomposition to root water content in a temperate broad-leaved forest

Kawamura, Ayumi; Makita, Naoki; Osawa, Akira

doi:10.3117/plantroot.7.77

Cited by 6 publications

(5 citation statements)

References 23 publications

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“…Importantly, the Rm rates obtained in our study were within the range of those found in previous studies for leaves (Fioretto et al, 2007;Papa et al, 2008) and roots (Chen et al, 2000;Kawamura et al, 2013;. These comparable values show a high contribution to total heterotrophic respiration and indicate the potential importance of Rm from leaf and fine root litter as a primary source of the heterotrophic respiration (Sulzman et al, 2005;Harmon et al, 2011).…”

Section: Speciessupporting

confidence: 84%

Tree species effects on microbial respiration from decomposing leaf and fine root litter

Makita

Fujii

2015

Soil Biology and Biochemistry

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Section: Speciessupporting

confidence: 84%

Tree species effects on microbial respiration from decomposing leaf and fine root litter

Makita

Fujii

2015

Soil Biology and Biochemistry

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“…Heterotrophic respiration is sensitive to seasonal rainfall patterns because soil water content strongly affects microbial physiology [ 12 ]. The biodiversity and metabolic activity of most soil microbial communities decrease with soil water content [ 54 , 55 ]. In fact, we found a significantly negative relationship between the temperature sensitivity of R s and temperature; monthly Q 10 and E a were highest in winter and lowest in summer ( Fig 4 ).…”

Section: Discussionmentioning

confidence: 99%

Seasonal and diurnal patterns of soil respiration in an evergreen coniferous forest: Evidence from six years of observation with automatic chambers

et al. 2018

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Soil respiration (Rs) plays a key role in the carbon balance of forest ecosystems. There is growing evidence that Rs is strongly correlated with canopy photosynthesis; however, how Rs is linked to aboveground attributes at various phenological stages, on the seasonal and diurnal scale, remains unclear. Using an automated closed dynamic chamber system, we assessed the seasonal and diurnal patterns of Rs in a temperate evergreen coniferous forest from 2005 to 2010. High-frequency Rs rates followed seasonal soil temperature patterns but the relationship showed strong hysteresis. Predictions of Rs based on a temperature-response model underestimated the observed values from June to July and overestimated those from August to September and from January to April. The observed Rs was higher in early summer than in late summer and autumn despite similar soil temperatures. At a diurnal scale, the Rs pattern showed a hysteresis loop with the soil temperature trend during the seasons of high biological activity (June to October). In July and August, Rs declined after the morning peak from 0800 to 1400 h, although soil temperatures continued to increase. During that period, figure-eight-shaped diurnal Rs patterns were observed, suggesting that a midday decline in root physiological activity may have occurred in early summer. In September and October, Rs was higher in the morning than in the night despite consistently high soil temperatures. We have characterised the magnitude and pattern of seasonal and diurnal Rs in an evergreen forest. We conclude that the temporal variability of Rs at high resolution is more related to seasons across the temperature dependence.

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“…The range of temperatures was intended to encompass the actual soil temperatures found at the site at the time of sampling. The respiration measurements were made within 12 h of sample collection, following the method as proposed by Chen et al [ 20 ] and Kawamura et al [ 21 ]. The temperature coefficients of the microbial respiration for each period, each species, and each diameter class were used to calculate its respiratory Q 10 .…”

Section: Methodsmentioning

confidence: 99%

“…Tree fine roots (<2 mm) are dynamic and short-lived, supplying considerable belowground litter inputs and accounting for up to 75% of the net primary production of forest ecosystems [ 19 ]. After root death, the decomposition of fine roots represents an important heterotrophic source of CO 2 [ 20 , 21 ]. During root decomposition, litter quality may vary because of the ingrowth of fungal and bacterial cells in fresh litter and the transfer of mineral nutrients as litter decay progresses [ 22 ].…”

Section: Introductionmentioning

confidence: 99%

“…Across a wide range of concentrations, mass loss is directly proportional to litter N and lignin and inversely proportional to C/N and lignin/N ratios [ 23 , 24 ]. However, the microbial respiration derived from early-stage root litters in forests remains ambiguous [ 21 ]. In addition, little information is available about continuous changes in the relationship between the temperature sensitivity of microbial respiration and litter quality in root litter.…”

Section: Introductionmentioning

confidence: 99%

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Temperature Sensitivity of Microbial Respiration of Fine Root Litter in a Temperate Broad-Leaved Forest

Makita

Kawamura

2015

PLoS ONE

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The microbial decomposition respiration of plant litter generates a major CO2 efflux from terrestrial ecosystems that plays a critical role in the regulation of carbon cycling on regional and global scales. However, the respiration from root litter decomposition and its sensitivity to temperature changes are unclear in current models of carbon turnover in forest soils. Thus, we examined seasonal changes in the temperature sensitivity and decomposition rates of fine root litter of two diameter classes (0–0.5 and 0.5–2.0 mm) of Quercus serrata and Ilex pedunculosa in a deciduous broad-leaved forest. During the study period, fine root litter of both diameter classes and species decreased approximately exponentially over time. The Q 10 values of microbial respiration rates of root litter for the two classes were 1.59–3.31 and 1.28–6.27 for Q. serrata and 1.36–6.31 and 1.65–5.86 for I. pedunculosa. A significant difference in Q 10 was observed between the diameter classes, indicating that root diameter represents the initial substrate quality, which may determine the magnitude of Q 10 value of microbial respiration. Changes in these Q 10 values were related to seasonal soil temperature patterns; the values were higher in winter than in summer. Moreover, seasonal variations in Q 10 were larger during the 2-year decomposition period than the 1-year period. These results showed that the Q 10 values of fine root litter of 0–0.5 and 0.5–2.0 mm have been shown to increase with lower temperatures and with the higher recalcitrance pool of the decomposed substrate during 2 years of decomposition. Thus, the temperature sensitivity of microbial respiration in root litter showed distinct patterns according to the decay period and season because of the temperature acclimation and adaptation of the microbial decomposer communities in root litter.

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Response of microbial respiration from fine root litter decomposition to root water content in a temperate broad-leaved forest

Cited by 6 publications

References 23 publications

Tree species effects on microbial respiration from decomposing leaf and fine root litter

Tree species effects on microbial respiration from decomposing leaf and fine root litter

Seasonal and diurnal patterns of soil respiration in an evergreen coniferous forest: Evidence from six years of observation with automatic chambers

Temperature Sensitivity of Microbial Respiration of Fine Root Litter in a Temperate Broad-Leaved Forest

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