Estimating weathering rates using base cation budgets in a Norway spruce stand on podzolised soil: Analysis of fluxes and uncertainties

Simonsson, Magnus; Bergholm, Johan; Olsson, Bengt A.; Brömssen, Claudia von; Öborn, Ingrid

doi:10.1016/j.foreco.2014.12.024

Cited by 22 publications

(33 citation statements)

References 42 publications

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“…The calculation was performed both with Ti and Zr as the immobile reference. The mass of fine earth was estimated layer by layer in the four control plots in 1989, when soil density and the content of stones and boulders were assessed to 50 cm depth (Simonsson et al 2015); for 50-100 cm depth, an average over the four plots for the mass of 40-50 cm was used as an estimate.…”

Section: Exchangeable Cations and Phmentioning

confidence: 99%

“…The biomass of all tree compartments above and below ground was derived from stem diameter measurements and allometric functions (see Simonsson et al 2015). The pools of K accumulated in the biomass relied on analyses performed in 2001 in all above-ground biomass compartments after digestion with concentrated HNO 3 and HClO 4 (volume-tovolume ratio of the acids, 10:1).…”

Section: K and Rb In Biomass And Littermentioning

confidence: 99%

“…The trees' gross uptake of K from forest floor and mineral soil was estimated by Simonsson et al (2015). The efflux of K from the forest floor to the mineral soil was measured in zero-tension humus lysimeter leachates collected at the bottom of the forest floor.…”

Section: Fluxes Of K Between Soil and Vegetationmentioning

confidence: 99%

“…9, fluxes of K from the zero-tension humus lysimeters are presented and compared with throughfall data acquired as described by Simonsson et al (2015). After the initial flush of K from decaying roots, K fluxes from the humus stabilised around 5 kg ha -1 year -1 in plot C24 (average 5.4 kg ha -1 year -1 ).…”

Section: Humus Lysimeter Datamentioning

confidence: 99%

“…The objective of the present study was to quantify the importance of different sources of K in the Skogaby experimental forest in southwest Sweden, where base cation weathering rates were recently estimated from nutrient budgets by Simonsson et al (2015). We particularly intended to test the ratio of potassium (K) over rubidium (Rb) extracted from clay minerals as an index of bio-cycling of K in the root zone of forest soils.…”

Section: Introductionmentioning

confidence: 99%

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Mineralogy and biogeochemistry of potassium in the Skogaby experimental forest, southwest Sweden: pools, fluxes and K/Rb ratios in soil and biomass

et al. 2016

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Clay minerals and K feldspars were evaluated as sources of K in a Norway spruce stand (Picea abies (L.) Karst.) from the Skogaby experimental forest in southwest Sweden. The soil, developed in a Quaternary glacial till, has only 3-5% clay, and more than 95% of its K resides in feldspars. Ratios of K/Rb were assessed in interlayers of 2:1 clay minerals (extracted with hot (100°C) 2 M HCl), biomass and the forest floor. These compartments had similarly low K/Rb ratios, whereas K feldspars were significantly poorer in Rb. A fractionation model indicated preferential retention of Rb in the biomass and forest floor, due to stronger adsorption of Rb than K in the humus, as well as preferential uptake of K from the exchange complex in the mineral soil. Preferential uptake of K may result from weaker adsorption of K by the cation exchanger, or preference for dissolved K over Rb by the roots. A quantitative mineralogical analysis revealed that loss from micas may account for half of the Holocene loss of K from the soil, which was approximately 22 Mg ha -1 . Exceptionally low K/Rb ratios in HCl extracts of the upper 60 cm of the profile indicated extensive loss of K from mica in the parent material and re-fixation of K and Rb at lower ratios. The results indicate that fixation in and release from clay minerals may be prominent in the cycling of K, even in a soil that is poor in clay minerals.

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Section: Exchangeable Cations and Phmentioning

confidence: 99%

Section: K and Rb In Biomass And Littermentioning

confidence: 99%

Section: Fluxes Of K Between Soil and Vegetationmentioning

confidence: 99%

Section: Humus Lysimeter Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mineralogy and biogeochemistry of potassium in the Skogaby experimental forest, southwest Sweden: pools, fluxes and K/Rb ratios in soil and biomass

et al. 2016

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2019

Ecology and Management of Forest Soils

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Nutrient Budgets in Forests Under Increased Biomass Harvesting Scenarios

Paré

Thiffault

2016

Curr Forestry Rep

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A developing bioeconomy and the need for alternate sources of energy are promoting a more intensive procurement and use of forest biomass. While it is a fact that increased biomass harvesting generates greater nutrient losses from forest ecosystems relative to stem-only harvesting, the use of nutrient budget approaches as a decision support tool in managing forests under intensive biomass removal is uncommon. This lack of use can be explained by several factors including: large uncertainties in predicting certain fluxes, the poor representation of nutrient dynamics following harvest in nutrient cycling models, the lack of representation of biological feedback, the lack of appropriate validation, and finally the lack of maps of specific soil properties that would be required to predict nutrient budgets over forest landscapes. This review documents the impact of intensive biomass extraction on nutrient cycling and discusses the gaps in knowledge and the uncertainties associated with nutrient budgets. It identifies research and development issues that need to be resolved for making forest nutrient budgets more reliable and more useful to address the questions regarding the environmental sustainability of intensive biomass harvesting.

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Estimating weathering rates using base cation budgets in a Norway spruce stand on podzolised soil: Analysis of fluxes and uncertainties

Cited by 22 publications

References 42 publications

Mineralogy and biogeochemistry of potassium in the Skogaby experimental forest, southwest Sweden: pools, fluxes and K/Rb ratios in soil and biomass

Mineralogy and biogeochemistry of potassium in the Skogaby experimental forest, southwest Sweden: pools, fluxes and K/Rb ratios in soil and biomass

References

Nutrient Budgets in Forests Under Increased Biomass Harvesting Scenarios

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