Contrasting patterns of soil N-cycling in model ecosystems of Fennoscandian boreal forests

Högberg, Mona N.; Myrold, David D.; Giesler, Reiner; Högberg, Peter

doi:10.1007/s00442-005-0253-7

Cited by 74 publications

(73 citation statements)

References 64 publications

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“…Also, as expected (e.g. Swift et al 1979;Scheu 1997;van der Krift and Berendse 2001;Högberg et al 2006;Parton et al 2007), less recalcitrant species showed higher rates of respiration and net N-mineralization, if significantly so only for beech compared to spruce. Beech had also higher net N-mineralization per unit C respired than spruce, even in the mineral topsoil, which may be due to its higher N-content (Bagherzadeh 2004;Zhang and Makeschin 2004).…”

Section: Differences In N-cycling Between Speciessupporting

confidence: 84%

“…However, the lack of litter quality effects on N-cycling seems contradictive to other literature reports (e.g. Scheu 1997;van der Krift and Berendse 2001;Högberg et al 2006;Parton et al 2007). However, when looking more closely, effects of higher litter quality may partly be attributed to higher litter input, which may also increase (van der Krift and Berendse 2001; Högberg et al 2006).…”

Section: Differences In N-cycling Between Speciescontrasting

confidence: 76%

“…For example, in Scheu (1997), net N-mineralization increased when nettle litter was applied, which had initial N-content of 43 mg g -1 . Also, initial N-content varied from 11 to 29 mg g -1 in Högberg et al (2006), and from 4 to 20 mg g -1 in Parton et al (2007). However, in our study, even though litter decomposition in the organic layer was clearly affected, initial N-contents probably ranged from 8 to 14 mg g -1 , which may have been too small for large effects on N-cycling.…”

Section: Differences In N-cycling Between Speciescontrasting

confidence: 70%

“…Scheu 1997;van der Krift and Berendse 2001;Högberg et al 2006;Parton et al 2007). However, when looking more closely, effects of higher litter quality may partly be attributed to higher litter input, which may also increase (van der Krift and Berendse 2001; Högberg et al 2006). Also, litter quality may only lead to significant changes in N-dynamics when initial N-content is very high, or variation between litter types rather large (Högberg et al 2006;Parton et al 2007).…”

Section: Differences In N-cycling Between Speciesmentioning

confidence: 99%

“…However, when looking more closely, effects of higher litter quality may partly be attributed to higher litter input, which may also increase (van der Krift and Berendse 2001; Högberg et al 2006). Also, litter quality may only lead to significant changes in N-dynamics when initial N-content is very high, or variation between litter types rather large (Högberg et al 2006;Parton et al 2007). For example, in Scheu (1997), net N-mineralization increased when nettle litter was applied, which had initial N-content of 43 mg g -1 .…”

Section: Differences In N-cycling Between Speciesmentioning

confidence: 99%

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Paradoxical differences in N-dynamics between Luxembourg soils: litter quality or parent material?

Kooijman

Smit

2009

Eur J Forest Res

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To explore whether litter quality could alter differences in N-dynamics between soil types, we compared spruce and beech growing on soils with parent material sandstone and limestone, and beech and hornbeam on acid marl and limestone. We measured pH, organic matter content, C:N ratio, soil respiration and net N-mineralization of the organic layer and the mineral topsoil in a laboratory incubation experiment and estimated gross N-mineralization and immobilization with a simulation model. Species effects were restricted to the organic layer, but higher mass for low-degradable species was compensated by higher process rates for high-degradable ones, so N-dynamics per square metre did not differ. Also, the mineral topsoil was not affected by litter quality, which may have been overruled by soil conditions. Forest soils formed from different parent materials, however, clearly differed in N-dynamics, although different from expectations for net N-mineralization. Sandstone showed low respiration and gross N-mineralization, but net N-mineralization was higher than expected, probably due to low microbial N-demand. In contrast, limestone, and to some extent acid marl, showed high respiration and gross N-release, but lower net N-mineralization than expected, because microbial immobilization was also high. Simulated gross N-mineralization even showed a negative instead of positive correlation with net N-mineralization, probably due to the strong increase in immobilization when gross N-mineralization is high. The shift in microbial N-demand may in turn be related to a more general shift from bacteria to fungi over pH-gradients.

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Section: Differences In N-cycling Between Speciessupporting

confidence: 84%

Section: Differences In N-cycling Between Speciescontrasting

confidence: 76%

Section: Differences In N-cycling Between Speciescontrasting

confidence: 70%

Section: Differences In N-cycling Between Speciesmentioning

confidence: 99%

Section: Differences In N-cycling Between Speciesmentioning

confidence: 99%

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Paradoxical differences in N-dynamics between Luxembourg soils: litter quality or parent material?

Kooijman

Smit

2009

Eur J Forest Res

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The bioelements, the elementome, and the biogeochemical niche

Peñuelas

Fernández‐Martínez

Ciais

et al. 2019

Ecology

178

188

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Every living creature on Earth is made of atoms of the various bioelements that are harnessed in the construction of molecules, tissues, organisms, and communities, as we know them. Organisms need these bioelements in specific quantities and proportions to survive and grow. Distinct species have different functions and life strategies, and have therefore developed distinct structures and adopted a certain combination of metabolic and physiological processes. Each species is thus also expected to have different requirements for each bioelement. We therefore propose that a “biogeochemical niche” can be associated with the classical ecological niche of each species. We show from field data examples that a biogeochemical niche is characterized by a particular elementome defined as the content of all (or at least most) bioelements. The differences in elementome among species are a function of taxonomy and phylogenetic distance, sympatry (the bioelemental compositions should differ more among coexisting than among non‐coexisting species to avoid competitive pressure), and homeostasis with a continuum between high homeostasis/low plasticity and low homeostasis/high plasticity. This proposed biogeochemical niche hypothesis has the advantage relative to other associated theoretical niche hypotheses that it can be easily characterized by actual quantification of a measurable trait: the elementome of a given organism or a community, being potentially applicable across taxa and habitats. The changes in bioelemental availability can determine genotypic selection and therefore have a feedback on ecosystem function and organization, and, at the end, become another driving factor of the evolution of life and the environment.

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Temperature responses of nitrogen processes cannot be inferred from carbon turnover in a boreal Norway spruce forest

Herrmann

Coucheney

2019

J. Plant Nutr. Soil Sci.

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Cold season processes contribute substantially to annual carbon (C) and nitrogen (N) budgets in boreal forest ecosystems, but little is known about how decomposition processes are affected at temperatures prevalent during wintertime. The aim of this study was to evaluate temperature responses of soil C and N processes and to test the hypothesis that there is a switch towards decomposing N‐rich material when soil temperatures drop to near 0°C. In the laboratory, soils from a boreal forest long‐term nutrient fertilization experiment were exposed to different temperatures varying from +2 to +15°C, and C mineralization, gross as well as net N mineralization/immobilization were estimated. Carbon mineralization declined exponentially as temperature decreased, whereas the response of N processes to temperature varied, with some indication that soil C and N processes are decoupled at low temperatures. We could only partially confirm that the decoupling between C and N processes at low temperature was due to a switch to N‐rich material, i.e., a change in the material undergoing decomposition. Overall, our results clearly showed that temperature responses of N processes cannot be inferred from C processes in boreal forest ecosystems, and that there is a need to improve our understanding of the relationship between the two across the range of temperatures experienced throughout the year. In particular, further research is required to establish and evaluate appropriate proxies for modelling the relationship of C and N processes at temperatures close to the freezing point.

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Contrasting patterns of soil N-cycling in model ecosystems of Fennoscandian boreal forests

Cited by 74 publications

References 64 publications

Paradoxical differences in N-dynamics between Luxembourg soils: litter quality or parent material?

Paradoxical differences in N-dynamics between Luxembourg soils: litter quality or parent material?

The bioelements, the elementome, and the biogeochemical niche

Temperature responses of nitrogen processes cannot be inferred from carbon turnover in a boreal Norway spruce forest

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