Temporal variations of biomass, carbon and nitrogen of roots under different tree species

Akburak, Serdar; Oral, Hasan Volkan; Özdemir, Emrah; Makineci, Ender

doi:10.1080/02827581.2012.679680

Cited by 17 publications

(7 citation statements)

References 37 publications

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“…3). It is well established that fine roots are very responsive to local variation in soil fertility, even within a season (Vanguelova et al, 2005;Akburak et al, 2013). When we combined our results on roots with published data on aboveground biomass to evaluate the possible impact of several fuelwood harvest strategies on soil fertility (objective #(iii) of this study), our simulations clearly showed that harvesting complete canopies (i.e.…”

Section: Discussionmentioning

confidence: 60%

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Biomass and nutrients in tree root systems–sustainable harvesting of an intensively managedPinus pinaster(Ait.) planted forest

Augusto¹,

Achat

Bakker

et al. 2014

GCB Bioenergy

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To develop sources of renewable energy and to reduce greenhouse gas emissions, increasing attention has been given to the extraction of forest biomass, especially in the form of harvest residues. However, increasing the removal of biomass, and hence nutrients, has raised concerns about the sustainability of site fertility and forest productivity. The environmental cost of harvesting belowground biomass is still not fully understood. The objectives of this study were to (i) estimate the stocks of belowground biomass that potentially can be collected; (ii) measure the nutrient (N, P, K, Ca, Mg) concentrations of the different root compartments (stumps, coarse and thin roots); and to (iii) quantify the biomass and nutrient exports under different scenarios, including harvests of above and belowground compartments. The study was carried out on Pinus pinaster stands located in southwestern France. Results showed that roots could be a significant fuelwood resource, particularly at forest clear cutting. Negative relationships between root diameter and root nutrient concentration were observed, independently of root function or tree age. Such relationships can be used to accurately simulate nutrient concentrations in roots as well as nutrient exports. Combining our original results on roots with previously published data on the aboveground compartments showed that nutrient losses were higher in canopy harvest scenarios than in root harvest scenarios. This was mainly due to high nutrient concentrations of needles. We concluded that stump and root harvest could be sustainable in our study context, conversely to foliage harvest. Because thin roots have higher nutrient concentrations than coarse roots and the proportion of thin roots increased with an increase in the distance from the tree, collecting roots only in the close vicinity of the stumps should limit nutrient exports (particularly N) without unnecessarily reducing fuelwood biomass.

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Section: Discussionmentioning

confidence: 60%

“…). It is well established that fine roots are very responsive to local variation in soil fertility, even within a season (Vanguelova et al ., ; Akburak et al ., ).…”

Section: Discussionmentioning

confidence: 97%

Biomass and nutrients in tree root systems–sustainable harvesting of an intensively managedPinus pinaster(Ait.) planted forest

Augusto¹,

Achat

Bakker

et al. 2014

GCB Bioenergy

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“…Annual mean precipitation is around 1091 mm, and mean annual temperature is 12.8 °C. Most of the precipitation falls between October and March (Balci et al 1986, Özhan et al 2010, Akburak et al 2013.…”

Section: Seedling Growth and Radicle Pruningmentioning

confidence: 99%

Germination and seedling growth of holm oak (Quercus ilex L.): effects of provenance, temperature, and radicle pruning

Çalışkan¹

2014

iForest

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“…This upscaling does not take into account the seasonal variability in above and below standing biomass and N concentration. Based on the studies of Ceccon et al (2011) and Akburak et al (2012), the increase of N content in roots late in the growing season can partly compensate the parallel increment of N content in the AG biomass. Additional measurements of N and C content along the season would be required to shed light on the internal cycling of these elements and to reduce uncertainties in computation of this scaling factor.…”

Section: R a Assessmentmentioning

confidence: 99%

Net primary productivity, allocation pattern and carbon use efficiency in an apple orchard assessed by integrating eddy covariance, biometric and continuous soil chamber measurements

et al. 2013

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Carbon use efficiency (CUE), the ratio of net primary production (NPP) over gross primary production (GPP), is a functional parameter that could possibly link the current increasingly accurate global GPP estimates with those of net ecosystem exchange, for which global predictors are still unavailable. Nevertheless, CUE estimates are actually available for only a few ecosystem types, while information regarding agro-ecosystems is scarce, in spite of the simplified spatial structure of these ecosystems that facilitates studies on allocation patterns and temporal growth dynamics.

We combined three largely deployed methods, eddy covariance, soil respiration and biometric measurements, to assess monthly values of CUE, NPP and allocation patterns in different plant organs in an apple orchard during a complete year (2010). We applied a measurement protocol optimized for quantifying monthly values of carbon fluxes in this ecosystem type, which allows for a cross check between estimates obtained from different methods. We also attributed NPP components to standing biomass increments, detritus cycle feeding and lateral exports.

We found that in the apple orchard, both net ecosystem production and gross primary production on a yearly basis, 380 ± 30 g C m⁻² and 1263 ± 189 g C m⁻² respectively, were of a magnitude comparable to those of natural forests growing in similar climate conditions. The largest differences with respect to forests are in the allocation pattern and in the fate of produced biomass. The carbon sequestered from the atmosphere was largely allocated to production of fruit: 49% of annual NPP was taken away from the ecosystem through apple production. Organic material (leaves, fine root litter, pruned wood and early fruit falls) contributing to the detritus cycle was 46% of the NPP. Only 5% was attributable to standing biomass increment, while this NPP component is generally the largest in forests.

The CUE, with an annual average of 0.71 ± 0.12, was higher than the previously suggested constant values of 0.47–0.50. Low nitrogen investment in fruit, the limited root apparatus, and the optimal growth temperature and nutritional condition observed at the site are suggested to be explanatory variables for the high CUE observed

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Temporal variations of biomass, carbon and nitrogen of roots under different tree species

Cited by 17 publications

References 37 publications

Biomass and nutrients in tree root systems–sustainable harvesting of an intensively managedPinus pinaster(Ait.) planted forest

Biomass and nutrients in tree root systems–sustainable harvesting of an intensively managedPinus pinaster(Ait.) planted forest

Germination and seedling growth of holm oak (Quercus ilex L.): effects of provenance, temperature, and radicle pruning

Net primary productivity, allocation pattern and carbon use efficiency in an apple orchard assessed by integrating eddy covariance, biometric and continuous soil chamber measurements

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