Temperature and moisture effects on respiration rate of decomposing logs in a Sitka spruce plantation in Ireland

Olajuyigbe, Samuel; Tobin, Brian; Nieuwenhuis, Maarten

doi:10.1093/forestry/cps045

Cited by 30 publications

(24 citation statements)

References 44 publications

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“…Secondly, it has been proven difficult to disentangle the relative importance of the different factors driving decomposition. For example, according to some studies temperature and wood moisture content are the dominant factors influencing decomposition rates via their impact on microbial activity (Olajuyigbe, Tobin, & Nieuwenhuis, 2012;Wang, Bond-Lamberty, & Gower, 2002), while other studies have reported that these variables explain small portions of total variance in decomposition rate (Bradford et al, 2014;Yang et al, 2016). Other factors reported to affect the decomposition process include substrate quality (e.g.…”

Section: Introductionmentioning

confidence: 99%

Carbon flux from decomposing wood and its dependency on temperature, wood N₂ fixation rate, moisture and fungal composition in a Norway spruce forest

Rinne‐Garmston

Peltoniemi

Chen

et al. 2019

Global Change Biology

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Globally 40–70 Pg of carbon (C) are stored in coarse woody debris on the forest floor. Climate change may reduce the function of this stock as a C sink in the future due to increasing temperature. However, current knowledge on the drivers of wood decomposition is inadequate for detailed predictions. To define the factors that control wood respiration rate of Norway spruce and to produce a model that adequately describes the decomposition process of this species as a function of time, we used an unprecedentedly diverse analytical approach, which included measurements of respiration, fungal community sequencing, N2 fixation rate, nifH copy number, 14C‐dating as well as N%, δ13C and C% values of wood. Our results suggest that climate change will accelerate C flux from deadwood in boreal conditions, due to the observed strong temperature dependency of deadwood respiration. At the research site, the annual C flux from deadwood would increase by 27% from the current 117 g C/kg wood with the projected climate warming (RCP4.5). The second most important control on respiration rate was the stage of wood decomposition; at early stages of decomposition low nitrogen content and low wood moisture limited fungal activity while reduced wood resource quality decreased the respiration rate at the final stages of decomposition. Wood decomposition process was best described by a Sigmoidal model, where after 116 years of wood decomposition mass loss of 95% was reached. Our results on deadwood decomposition are important for C budget calculations in ecosystem and climate change models. We observed for the first time that the temperature dependency of N2 fixation, which has a major role at providing N for wood‐inhabiting fungi, was not constant but varied between wood density classes due to source supply and wood quality. This has significant consequences on projecting N2 fixation rates for deadwood in changing climate.

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Section: Introductionmentioning

confidence: 99%

Carbon flux from decomposing wood and its dependency on temperature, wood N₂ fixation rate, moisture and fungal composition in a Norway spruce forest

Rinne‐Garmston

Peltoniemi

Chen

et al. 2019

Global Change Biology

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“…However, Eaton and Lawrence (2006) recorded the average decay rate constant was 0.278 in secondary forests in Southern Mexico, which is higher than our results. Differences in decay rates are probably due to the differences in woody substrate quality, site conditions (temperature and humidity) and the characteristics of organisms in woody debris (Bond-Lamberty et al 2003;Harmon et al 1986;Olajuyigbe et al 2012). It is important to note, however, that the decay rates presented here are based only on log respiration and ignore fragmentation by fauna.…”

Section: Other Important Controllers Over Log Respirationmentioning

confidence: 98%

Respiration of downed logs in four natural evergreen broad-leaved forests in subtropical China

et al. 2014

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Background and aims Carbon (C) loss from coarse woody debris (CWD) may be important in forest ecosystem C budgets, yet few studies have assessed CWD respiration in natural evergreen broad-leaved forests in subtropical China. The objectives of this study were (1) to quantify the respiration rates of downed logs (R log ) and Q 10 of different tree species at various stages of decay, (2) to assess the effect of microclimatic (log temperature and moisture) variables on R log and (3) to estimate annual C flux of the CWD logs in four natural evergreen broad-leaved forest types of Altingia gracilipes Hemsl. (ALG), Tsoongiodendron odorum Chun (TSO), Castanopsis carlesii (Hemsl.) Hayata (CAC) and Cinnamomum chekiangense Nakai (CIC) in southern China. Methods A dynamic chamber method was used to measure R log in four decay classes (DCs) (ranging from freshly felled logs in DC 1 to highly decomposed logs in DC 4). The effects of changes in log temperature (T log ) and log moisture content (M log ) on R log were determined and annual R log estimated. ResultsThe R log exhibited a distinct seasonal pattern, and it was predominantly controlled by the log temperature. The temperature sensitivity of R log to log temperature as indicated by Q 10 ranged from 1.82 to 2.86 and was variable among decay classes and forests. Significant relationships between moisture content of logs and R log were only observed for logs in the ALG (P=0.001), TSO (P=0.002) and CIC (P<0.001). The log temperature in combination with the moisture of logs explained over 60 % of the variation in R log. The effects of decay class (F=3.707, df=3, P=0.013) and tree species (F=8.705, df=3, P<0.001) on R log were significant. Annual C fluxes ranged from 652 kg C ha −1 year −1 in the CIC to 1,243 kg C ha −1 year −1 in the TSO, with varying contributions from each decay class. Conclusions At these subtropical natural forests, R log was a significant component of overall heterotrophic respiration (about 10-20 % on the annual basis). With increasing climate change-associated tree mortality in our mature forests, CWD respiration is expected to increase. The results indicate that species, decay stage and microclimatic conditions should be considered when predicting CWD decay rates.

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“…,b; Katayama et al . ), and 273·5 K (Olajuyigbe, Tobin & Nieuwenhuis ). While the first two values represent the same number rounded to a different number of decimal places, the last is clearly incorrect.…”

Section: Application: Case Study and Estimation Of Errors In The Prevmentioning

confidence: 99%

“…In addition, we noticed some inconsistencies in attributing the recommended value of T i (273Á15 K, as recognized by the International Union of Pure and Applied Chemistry (IUPAC; Cohen & Taylor 1987) to convert temperature in degrees Celsius to Kelvin. For instance, studies used 273 K (Stahl et al 2011;Liu et al 2013;Rowland et al 2013), 273Á2 K (Jomura et al 2007(Jomura et al , 2008Ataka et al 2014a, b;Katayama et al 2014), and 273Á5 K (Olajuyigbe, Tobin & Nieuwenhuis 2012). While the first two values represent the same number rounded to a different number of decimal places, the last is clearly incorrect.…”

Section: E R R O R S I N T H E C a L C U L A T I O N O F C O 2 E F F mentioning

confidence: 99%

Correct calculation of CO₂ efflux using a closed‐chamber linked to a non‐dispersive infrared gas analyzer

et al. 2015

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1. Improved understanding of the carbon (C) cycle is essential to model future climates and how this may feedback to affect greenhouse gas fluxes. 2. We summarize previous work quantifying respiration rates of organic substrates and briefly discuss how advances in technology, specifically the use of chambers linked to a non-dispersive infrared gas analyzer (NDIR), can be applied to assess carbon dynamics from short-term field measurements. This technology hastens measurement and is relatively inexpensive, enabling researchers to increase replication and investigate temporal and spatial variation. 3. We describe the theory behind calculations of CO 2 efflux released through organic substrates, when using a closed-chamber linked to a NDIR. These methods can in principle be extended to any chamber-based measurement of gas fluxes, including partially closed chambers as used for soil surface CO 2 , nitrous oxide or methane effluxes and stem CO 2 respiration, although additional assumptions may apply. 4. We show that incorrect application of formulae in some earlier studies resulted in either under-or over-estimation of CO 2 effluxes. Of the studies, we reviewed measuring the respiration of woody debris, leaf litter or woody stems using closed chambers linked to a NDIR, only 22% (11 of 51) provided the equations used to calculate CO 2 efflux, and 72% (8 of 11) of those provided contained basic errors. Using our data on the decomposition of woody debris as an example, we found that such mistakes resulted in anywhere from 8% underestimation to 22% overestimation of CO 2 efflux. The errors varied among studies and hence may limit understanding of the factors affecting emissions of CO 2 and our ability to incorporate this knowledge into global carbon models. 5. We provide formulae for the correct calculation of respiration rates in future studies using closed chambers and thus provide a basis for comparative studies of factors affecting CO 2 efflux from woody debris, leaf litter and other substrates. Ultimately, this will contribute to improved parameterization of forest respiration.

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Temperature and moisture effects on respiration rate of decomposing logs in a Sitka spruce plantation in Ireland

Cited by 30 publications

References 44 publications

Carbon flux from decomposing wood and its dependency on temperature, wood N₂ fixation rate, moisture and fungal composition in a Norway spruce forest

Carbon flux from decomposing wood and its dependency on temperature, wood N₂ fixation rate, moisture and fungal composition in a Norway spruce forest

Respiration of downed logs in four natural evergreen broad-leaved forests in subtropical China

Correct calculation of CO₂ efflux using a closed‐chamber linked to a non‐dispersive infrared gas analyzer

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Temperature and moisture effects on respiration rate of decomposing logs in a Sitka spruce plantation in Ireland

Cited by 30 publications

References 44 publications

Carbon flux from decomposing wood and its dependency on temperature, wood N2 fixation rate, moisture and fungal composition in a Norway spruce forest

Carbon flux from decomposing wood and its dependency on temperature, wood N2 fixation rate, moisture and fungal composition in a Norway spruce forest

Respiration of downed logs in four natural evergreen broad-leaved forests in subtropical China

Correct calculation of CO2 efflux using a closed‐chamber linked to a non‐dispersive infrared gas analyzer

Contact Info

Product

Resources

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Carbon flux from decomposing wood and its dependency on temperature, wood N₂ fixation rate, moisture and fungal composition in a Norway spruce forest

Carbon flux from decomposing wood and its dependency on temperature, wood N₂ fixation rate, moisture and fungal composition in a Norway spruce forest

Correct calculation of CO₂ efflux using a closed‐chamber linked to a non‐dispersive infrared gas analyzer