Soil organic carbon stabilization in forest subsoils: Directions for the research community – Comment on “Biogeochemical limitations of carbon stabilization in forest subsoils” by Patrick Liebmann et al., Journal of Plant Nutrition and Soil Science, 185(1), 35–43 (2022)

Lorenz, Klaus; Billings, S. A.; Jungkunst, Hermann F.

doi:10.1002/jpln.202200090

Cited by 1 publication

(2 citation statements)

References 40 publications

(47 reference statements)

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“…In addition, changing characteristics of the N cycle, such as the input of N or whether the trees prefer NH 4 + and/or NO 3 – as a nutrient source, indirectly affect the net ecosystem exchange (Schulze, 2000), for example by altering the tree biomass production. It remains uncertain how management practices and tree species selection affect this functioning as a C sink, especially in the subsoil (Lorenz et al., 2022). A better understanding of such effects under current climatic conditions is a prerequisite for reliable predictions of this C sink under a changing climate (IPCC, 2019; Nabuurs et al., 2007).…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, Rumpel and Kögel‐Knabner (2011) reported that subsoil OC was more stabilised as compared to topsoil OC. Despite the large importance of subsoils as a C reservoir, it remains unclear whether tree species effects could be extrapolated from the topsoil, and which processes are responsible for differences in subsoil OC and N stocks (Lorenz et al., 2022).…”

Section: Introductionmentioning

confidence: 99%

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Tree species affect the vertical distribution of soil organic carbon and total nitrogen

Steffens

Beer

Schelfhout

et al. 2022

J. Plant Nutr. Soil Sci.

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Background: Forest soils are considered sinks for atmospheric C. Many studies revealed that tree species and their mycorrhizal association affect forest floor and topsoil organic C (OC) and total N, while the knowledge of their effect on subsoil OC and N is still scarce. Aims:We aimed to identify (1) tree species and mycorrhizal association effects on forest floor, topsoil (0-30 cm) and subsoil (30-80 cm) OC and N stocks and vertical distribution and (2) drivers for soil OC and N distribution. Methods:We sampled forest floor, topsoil and subsoil under Fagus sylvatica L., Quercus robur L., Acer pseudoplatanus L. and Fraxinus excelsior L. in four Danish common garden experiments along a gradient in soil texture and determined OC and N stocks.Results: Total N (forest floor + soil) was higher under oak than beech, while total OC was unaffected by species. Forest floor C and N were higher under oak and beech, both ectomycorrhizal species (ECM), compared to under maple and ash, which are both arbuscular mycorrhizal species (AM). Relatively more OC and N were transferred to the topsoil under AM than ECM species, and this could be explained by greater endogeic earthworm biomass in AM species. In contrast, a higher proportion of OC was stored under ECM than AM species in the subsoil, and here OC correlated negatively with anecic earthworms.Subsoil N was highest under oak.Conclusions: Tree species and in particular their mycorrhizal association affected the vertical distribution of soil OC and N. Tree species differences in topsoil OC and N were not mirrored in the subsoil, and this highlights the need to address the subsoil in future studies on AM-versus ECM-mediated soil OC and N stocks.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%