Drivers of temperature sensitivity of decomposition of soil organic matter along a mountain altitudinal gradient in the Western Carpathians

Klimek, Beata; Jelonkiewicz, Łukasz; Niklińska, Maria

doi:10.1007/s11284-016-1369-4

Cited by 17 publications

(18 citation statements)

References 31 publications

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“…In the present study, Q 10 values decreased with increasing incubation temperature (Figure ), which was consistent with the observations in numerous individual studies (e.g., Koch et al, ; Hamdi et al, ; Klimek, Jelonkiewicz, & Niklińska, ). Increasing temperature can enhance the size of labile SOC pools by favouring the desorption of SOC–humate complexes and reducing physical protection to accelerate SOC decomposition (Conant et al, ; Davidson & Janssens, ; Schmidt et al, ).…”

Section: Discussionsupporting

confidence: 93%

“…In addition, it is generally considered that forest soils at high latitudes are more limited by N than those at low latitudes, so N limitation will stimulate microbes to gain more N from soil organic matter at high temperature according to microbial N mining theory (Chen et al, 2014). Furthermore, long-term microbial adaptation to the el- In the present study, Q 10 values decreased with increasing incubation temperature (Figure 3), which was consistent with the observations in numerous individual studies (e.g., Koch et al, 2007;Hamdi et al, 2013;Klimek, Jelonkiewicz, & Niklińska, 2016).…”

Section: Q 10 In Different Ecosystems and Influencing Factorssupporting

confidence: 91%

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Global synthesis of temperature sensitivity of soil organic carbon decomposition: Latitudinal patterns and mechanisms

et al. 2019

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The response of soil organic carbon (SOC) decomposition to global warming is a potentially major source of uncertainty in climate prediction. However, the magnitude and direction of SOC cycle feedbacks under climate warming remain uncertain because of the knowledge gap about the global‐scale spatial pattern and temperature sensitivity (Q10) mechanism of SOC decomposition. Here, we collected data of Q10 and corresponding soil variables from 81 peer‐reviewed papers using laboratory incubation to explore how Q10 varied among different ecosystems at the global scale and whether labile and recalcitrant SOC pools had equal Q10 values. Q10 with a global average of 2.41 substantially varied among different ecosystems, ranging from the highest in cropland soils (2.76) and the lowest in wetland soils (1.84). Hump‐shaped correlations of Q10 values with the maximum at SOC = 190 g/kg and the minimum at clay = 37% were observed. However, the main influencing factors of Q10 differed among various ecosystems. Q10 values showed a clear decrease with increasing incubation temperature but no significant decrease above 25°C. In general, labile SOC was less sensitive than recalcitrant SOC to warming. Structural equation model analyses showed that total N and SOC accounted for 53% and 46%, respectively, of the variation in Q10 of labile SOC and recalcitrant SOC. This finding suggested that Q10 values of labile and recalcitrant SOC pools had different controlling factors. Our findings highlighted the importance of Q10’s variations in ecosystem types and the response of recalcitrant SOC to warming in predicting the soil C cycling and its feedback to climate change. Therefore, ecosystem type and difference in Q10 of labile and recalcitrant SOC should be considered to precisely predict the soil C dynamics under global warming. A http://onlinelibrary.wiley.com/doi/10.1111/1365-2435.13256/suppinfo is available for this article.

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Section: Discussionsupporting

confidence: 93%

Section: Q 10 In Different Ecosystems and Influencing Factorssupporting

confidence: 91%

Global synthesis of temperature sensitivity of soil organic carbon decomposition: Latitudinal patterns and mechanisms

et al. 2019

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“…In that regard, our results confirm the findings from earlier studies that demonstrated the pivotal role of topography (alongside with factors such as vegetation and climate) for the formation of soil organic carbon patterns in high mountain areas [72][73][74]. Spatial variation of organic matter decomposition has been reported to be engendered by differences of soil temperature [75][76][77][78], soil moisture [79][80][81][82], litter quality and quantity [83][84][85], slope processes [86] and seasonality. These factors are likely to be strongly affected by the topographic diversity in our study area, thus they potentially govern also spatial differences that we found in the models of this study.…”

Section: Soil Ecological Implicationssupporting

confidence: 91%

Humus Forms and Soil Microbiological Parameters in a Mountain Forest: Upscaling to the Slope Scale

et al. 2018

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Humus forms are the morphological results of organic matter decay and distribution in the topsoil, and thus important indicators for decomposer activities in forest ecosystems. The first aim was to examine if humus forms are suitable indicators of microbiological properties of the topsoil in a high mountain forest (Val di Rabbi, Trentino, Italian Alps). The second aim was to predict microbiological parameters based on the topsoil pH value on two slopes of the study area (ca. 1200-2200 m a.s.l.). We investigated humus forms and determined pH values and microbiological parameters (enzymatic activities, carbon/nitrogen (C/N) ratio and the ratio of bacterial/archaeal abundance) of the uppermost mineral horizon. The results reveal significant correlations between pH value and microbiological parameters (except for bacterial/archaeal abundance), which enable upscaling to the landscape scale using linear models. Based on a random forest with kriging of model residuals, predictive maps of humus form, pH value and microbiological parameters show that decomposition processes in our study area correspond with the topography. As compared to locations on south-facing slopes or close to the valley bottom, locations on north-facing slopes or close to the upper treeline exhibit Moder (scarcely Mull or Amphimull), more acidic topsoil (around pH 4), a lower activity of leucine-aminopeptidase, a lower ratio of alkaline/acid phosphomonoesterase activity and a higher soil C/N ratio (above 20). Our results suggest a high potential of humus forms to indicate soil microbiological properties in a high mountain forest. Together with the pH values of the topsoil, humus forms proved to be a useful tool as a basis for predictive maps of leucine-aminopeptidase activity, ratio of alkaline/acid phosphomonoesterase activity and C/N ratio of the mineral topsoil.

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“…Soil organic matter (SOM) decomposition processes are temperature dependent and may accelerate global climate warming through positive feedback (Kirschbaum 2000;Karhu et al 2010;You et al 2019). The temperature sensitivity of soil respiration can be regulated by a range of biotic and abiotic factors (Klimek et al 2016a(Klimek et al , 2020. However, our knowledge in this matter is still far from satisfactory.…”

Section: Introductionmentioning

confidence: 99%

Soil respiration in seven types of temperate forests exhibits similar temperature sensitivity

2020

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Purpose The aim of the study was to compare the temperature sensitivity of soil respiration rate in two soil horizons of seven types of temperate forests. Materials and methods Soil samples were collected in O and A horizons in seven types of temperate forests, each one represented by five independent stands distributed throughout Poland. Soil respiration rates were measured at standard moisture in five temperatures (4 °C, 10 °C, 16 °C, 22 °C and 28 °C), and the first-order Q10 values were calculated for each stand. General linear models (GLM) were fitted for respiration rate and for Q10 values separately using selected soil physical-chemical properties: C:N ratio, dissolved organic carbon (DOC) content and soil pH. Results and discussion The soil respiration rate increased with temperature was the highest in O horizon of fresh mixed forest dominated by hornbeam and increased with C:N ratio, DOC content and soil pH (model p < 0.0001). In turn, model for Q10 was not significant meaning none of tested variables affected soil temperature sensitivity (p = 0.2886). Conclusions Despite studied forest types exhibit substantial distinctness in many soil properties including respiration rate, they showed similar susceptibility to temperature increase (roughly to climate warming).

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Drivers of temperature sensitivity of decomposition of soil organic matter along a mountain altitudinal gradient in the Western Carpathians

Cited by 17 publications

References 31 publications

Global synthesis of temperature sensitivity of soil organic carbon decomposition: Latitudinal patterns and mechanisms

Global synthesis of temperature sensitivity of soil organic carbon decomposition: Latitudinal patterns and mechanisms

Humus Forms and Soil Microbiological Parameters in a Mountain Forest: Upscaling to the Slope Scale

Soil respiration in seven types of temperate forests exhibits similar temperature sensitivity

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