Partitioning of soil respiration into its autotrophic and heterotrophic components by means of tree-girdling in old boreal spruce forest

Högberg, Peter; Bhupinderpal‐Singh,; Löfvenius, Mikaell Ottosson; Nordgren, Anders

doi:10.1016/j.foreco.2009.01.036

Cited by 73 publications

(50 citation statements)

References 26 publications

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“…Higher R a is likely dominated by increased growth respiration, while maintenance respiration is assumed to undergo less seasonal change (Wieser and Bahn, 2004). Although higher temperatures in late summer undoubtedly play a role in the observed increase in R a , the occurrence of hysteresis, expressed as different respiration rates measured at the same soil temperatures in different seasons (Högberg et al, 2009), suggests that additional factors, such as phenology, control R a . At shorter time scales, changes in physical transport processes of CO 2 and heat hold an alternative explanation for the occurrence of hysteresis (Subke and Bahn, 2010;Phillips et al, 2011).…”

Section: Rhizosphere Respirationmentioning

confidence: 99%

“…While many experiments suggest that R a strongly depends on recent photosynthates as indicated by rapid and pronounced declines in soil respiration after clipping, shading or phloem girdling (Craine et al, 1999;Högberg et al, 2001;Wan and Luo, 2003), other studies have reported only minor effects (Hibbard et al, 2005;Zhou et al, 2007;Bahn et al, 2009;Bond-Lamberty and Thomson, 2010). These latter studies indicate that root C stores might serve as respiratory substrates for R a and allow to maintain respiration rates at least temporarily (Bahn et al, 2006).…”

Section: Rhizosphere Respirationmentioning

confidence: 99%

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Carbon allocation and carbon isotope fluxes in the plant-soil-atmosphere continuum: a review

Brüggemann¹,

et al. 2011

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Abstract. The terrestrial carbon (C) cycle has received increasing interest over the past few decades, however, there is still a lack of understanding of the fate of newly assimilated C allocated within plants and to the soil, stored within ecosystems and lost to the atmosphere. Stable carbon isotope studies can give novel insights into these issues. In this review we provide an overview of an emerging picture of plant-soil-atmosphere C fluxes, as based on C isotopeCorrespondence to: N. Brüggemann (n.brueggemann@fz-juelich.de) studies, and identify processes determining related C isotope signatures. The first part of the review focuses on isotopic fractionation processes within plants during and after photosynthesis. The second major part elaborates on plantinternal and plant-rhizosphere C allocation patterns at different time scales (diel, seasonal, interannual), including the speed of C transfer and time lags in the coupling of assimilation and respiration, as well as the magnitude and controls of plant-soil C allocation and respiratory fluxes. Plant responses to changing environmental conditions, the functional relationship between the physiological and phenological status of plants and C transfer, and interactions between Published by Copernicus Publications on behalf of the European Geosciences Union. 3458 N. Brüggemann et al.: Plant-soil-atmosphere C fluxes C, water and nutrient dynamics are discussed. The role of the C counterflow from the rhizosphere to the aboveground parts of the plants, e.g. via CO 2 dissolved in the xylem water or as xylem-transported sugars, is highlighted. The third part is centered around belowground C turnover, focusing especially on above-and belowground litter inputs, soil organic matter formation and turnover, production and loss of dissolved organic C, soil respiration and CO 2 fixation by soil microbes. Furthermore, plant controls on microbial communities and activity via exudates and litter production as well as microbial community effects on C mineralization are reviewed. A further part of the paper is dedicated to physical interactions between soil CO 2 and the soil matrix, such as CO 2 diffusion and dissolution processes within the soil profile. Finally, we highlight state-of-the-art stable isotope methodologies and their latest developments. From the presented evidence we conclude that there exists a tight coupling of physical, chemical and biological processes involved in C cycling and C isotope fluxes in the plant-soil-atmosphere system. Generally, research using information from C isotopes allows an integrated view of the different processes involved. However, complex interactions among the range of processes complicate or currently impede the interpretation of isotopic signals in CO 2 or organic compounds at the plant and ecosystem level. This review tries to identify present knowledge gaps in correctly interpreting carbon stable isotope signals in the plant-soil-atmosphere system and how future research approaches could contribute to closing these gaps.

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Section: Rhizosphere Respirationmentioning

confidence: 99%

Section: Rhizosphere Respirationmentioning

confidence: 99%

Carbon allocation and carbon isotope fluxes in the plant-soil-atmosphere continuum: a review

Brüggemann¹,

et al. 2011

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“…Medlyn et al, 2005). This assumption may, however, not be so simple, since approximately 50% of the soil respiration in a coniferous forest is coming from autotrophic processes (Högberg et al, 2009). In a recent review, Davidson et al (2006) stated that this issue is still quite poorly studied or understood.…”

Section: Seasonal Changes In R Ementioning

confidence: 99%

A young afforestation area in Iceland was a moderate sink to CO<sub>2</sub> only a decade after scarification and establishment

2009

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Abstract. This study reports on three years (2004)(2005)(2006) of measurements of net ecosystem exchange (NEE) over a young Siberian larch plantation in Iceland established on previously grazed heathland pasture that had been scarified prior to planting. The study evaluated the variation of NEE and its component fluxes, gross primary production (GPP) and ecosystem respiration (R e ), with the aim to clarify how climatic factors controlled the site's carbon balance. The young plantation acted as a relatively strong sink for CO 2 during all of the three years, with an annual net sequestration of −102, −154, and −67 g C m −2 for 2004, 2005, and 2006, respectively. This variation was more related to variation in carbon efflux (R e ) than carbon uptake (GPP). The abiotic factors that showed the strongest correlation to R e were air temperature during the growing season and soil water potential. The GPP mostly followed the seasonal pattern in irradiance, except in 2005, when the plantation experienced severe spring frost damage that set the GPP back to zero. It was not expected that the rather slow-growing Siberian larch plantation would be such a strong sink for atmospheric CO 2 only twelve years after site preparation and afforestation.

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“…Additionally, this is very similar to the percent R H estimate obtained from our P-B treatment, which was 76% ± 7%. Other studies conducted in temperate forests have also reported much higher R H contributions to R S relative to R A [12,21,38,39].…”

Section: Partitioning Of Soil Co 2 Effluxmentioning

confidence: 76%

Soil CO2 Efflux and Root Productivity in a Switchgrass and Loblolly Pine Intercropping System

Shrestha

Seiler

Strahm

et al. 2016

Forests

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Switchgrass intercropped with loblolly pine plantations can provide valuable feedstock for bioenergy production while providing ancillary benefits like controlling competing vegetation and enhancing soil C. Better understanding of the impact of intercropping on pine and switchgrass productivity is required for evaluating the long-term sustainability of this agroforestry system, along with the impacts on soil C dynamics (soil CO 2 efflux; R S ). R S is the result of root respiration (R A ) and heterotrophic respiration (R H ), which are used to estimate net C ecosystem exchange. We measured R S in intercropped and monoculture stands of loblolly pine (Pinus taeda L.) and switchgrass (Panicum virgatum L.). The root exclusion core technique was used to estimate R A and R H . The results showed pure switchgrass had significantly higher R S rates (July, August and September), root biomass and length relative to intercropped switchgrass, while there were no significant changes in R S and roots between intercropped and monoculture loblolly pine stands. A significant decrease in switchgrass root productivity in the intercropped stands versus monoculture stands could account for differences in the observed R S . The proportions of R S attributed to R A in the intercropped stand were 31% and 22% in the summer and fall respectively, indicating that the majority of the R S was heterotrophic-driven. Ancillary benefits provided by planting switchgrass between unutilized pine rows can be considered unless the goal is to increase switchgrass production.

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Partitioning of soil respiration into its autotrophic and heterotrophic components by means of tree-girdling in old boreal spruce forest

Cited by 73 publications

References 26 publications

Carbon allocation and carbon isotope fluxes in the plant-soil-atmosphere continuum: a review

Carbon allocation and carbon isotope fluxes in the plant-soil-atmosphere continuum: a review

A young afforestation area in Iceland was a moderate sink to CO<sub>2</sub> only a decade after scarification and establishment

Soil CO2 Efflux and Root Productivity in a Switchgrass and Loblolly Pine Intercropping System

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Partitioning of soil respiration into its autotrophic and heterotrophic components by means of tree-girdling in old boreal spruce forest

Cited by 73 publications

References 26 publications

Carbon allocation and carbon isotope fluxes in the plant-soil-atmosphere continuum: a review

Carbon allocation and carbon isotope fluxes in the plant-soil-atmosphere continuum: a review

A young afforestation area in Iceland was a moderate sink to CO&lt;sub&gt;2&lt;/sub&gt; only a decade after scarification and establishment

Soil CO2 Efflux and Root Productivity in a Switchgrass and Loblolly Pine Intercropping System

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A young afforestation area in Iceland was a moderate sink to CO<sub>2</sub> only a decade after scarification and establishment