Estimating global carbon uptake by lichens and bryophytes with a process-based model

Porada, Philipp; Weber, Bettina; Elbert, Wolfgang; Pöschl, Ulrich; Kleidon, Axel

doi:10.5194/bg-10-6989-2013

Cited by 127 publications

(169 citation statements)

References 145 publications

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“…However, the results of this study have implications for the biogeochemical modeling of cryptogamic ground covers. Though recently proposed models consider the water storage capacity of the thalli (Porada et al 2013) or apply scaling factors for given ecosystem categories (Elbert et al 2012), soil texture was not parameterized explicitly. We suggest to consider soil texture in biogeochemical modeling of biological soil crusts.…”

Section: Discussionmentioning

confidence: 99%

Climatic and soil texture threshold values for cryptogamic cover development: a meta analysis

Fischer

Subbotina

2014

Biologia

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In a global meta study, which contained 157 biological soil crust (BSC) samples from all climatic regions worldwide, climatic and soil texture threshold values favoring BSC development were derived. Response variable was the "relative crust biomass", which was computed per literature source as the ratio between each individual crust biomass value of the given study to the study maximum value reported. Four crust types were distinguished: cyanobacterial, lichen, green algal and moss crusts. To quantify threshold conditions at which crust biomass responded to differences in texture and climate, we (I) determined correlations between bioclimatic variables, (II) calculated generalized linear models to determine the effect of typical climatic variables with soil clay content and with study site as a random effect. (III) Thresholds of climatic and texture effects were identified using a regression tree. Three mean annual temperature classes for texture dependent BSC growth limitation were identified: (1) <9• C with a threshold value of 25% silt and clay (limited growth on coarser soils), (2) 9-19• C, where texture did have no influence on relative crust biomass, and (3) >19• C at soils with <4 or >17% silt and clay. Non of the precipitation related bioclimatic variables did influence the relative crust biomass significantly. Because biocrust development is limited under certain climatic and soil texture conditions, it is suggested to consider soil texture in biogeochemical modeling of cryptogamic ground covers.

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Section: Discussionmentioning

confidence: 99%

Climatic and soil texture threshold values for cryptogamic cover development: a meta analysis

Fischer

Subbotina

2014

Biologia

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“…We used a trait-based spatial model of cryptogamic vegetation (i.e., bryophyte and lichen) cover to estimate the potential global NPP of the early nonvascular plant biosphere (29,30). The Late Ordovician (445 Ma, Hirnantian stage) setup of the model is fully described elsewhere (32).…”

Section: Methodsmentioning

confidence: 99%

Earliest land plants created modern levels of atmospheric oxygen

Lenton

Dahl

Daines

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

274

224

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The progressive oxygenation of the Earth's atmosphere was pivotal to the evolution of life, but the puzzle of when and how atmospheric oxygen (O 2 ) first approached modern levels (∼21%) remains unresolved. Redox proxy data indicate the deep oceans were oxygenated during 435-392 Ma, and the appearance of fossil charcoal indicates O 2 >15-17% by 420-400 Ma. However, existing models have failed to predict oxygenation at this time. Here we show that the earliest plants, which colonized the land surface from ∼470 Ma onward, were responsible for this mid-Paleozoic oxygenation event, through greatly increasing global organic carbon burialthe net long-term source of O 2 . We use a trait-based ecophysiological model to predict that cryptogamic vegetation cover could have achieved ∼30% of today's global terrestrial net primary productivity by ∼445 Ma. Data from modern bryophytes suggests this plentiful early plant material had a much higher molar C:P ratio (∼2,000) than marine biomass (∼100), such that a given weathering flux of phosphorus could support more organic carbon burial. Furthermore, recent experiments suggest that early plants selectively increased the flux of phosphorus (relative to alkalinity) weathered from rocks. Combining these effects in a model of long-term biogeochemical cycling, we reproduce a sustained +2‰ increase in the carbonate carbon isotope (δ 13 C) record by ∼445 Ma, and predict a corresponding rise in O 2 to present levels by 420-400 Ma, consistent with geochemical data. This oxygen rise represents a permanent shift in regulatory regime to one where fire-mediated negative feedbacks stabilize high O 2 levels.oxygen | Paleozoic | phosphorus | plants | weathering

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“…Statistical analyses have served as the main means to deduce the impacts of various environmental factors on observed biocrust response in the majority of field and laboratory studies (Barger et al, 2006;Grote et al, 2010;Bowker et al, 2010a;Castillo-Monroy et al, 2011;Maestre et al, 2013). Process-based models have also been developed for biocrusts of lichens and mosses (Porada et al, 2013(Porada et al, , 2014(Porada et al, , 2016(Porada et al, , 2017. These studies estimate their contribution to the carbon uptake and nitrous oxide emissions on a global scale under various climatic conditions.…”

Section: Introductionmentioning

confidence: 99%

Hydration status and diurnal trophic interactions shape microbial community function in desert biocrusts

Kim

2017

Biogeosciences

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Abstract. Biological soil crusts (biocrusts) are selforganised thin assemblies of microbes, lichens, and mosses that are ubiquitous in arid regions and serve as important ecological and biogeochemical hotspots. Biocrust ecological function is intricately shaped by strong gradients of water, light, oxygen, and dynamics in the abundance and spatial organisation of the microbial community within a few millimetres of the soil surface. We report a mechanistic model that links the biophysical and chemical processes that shape the functioning of biocrust representative microbial communities that interact trophically and respond dynamically to cycles of hydration, light, and temperature. The model captures key features of carbon and nitrogen cycling within biocrusts, such as microbial activity and distribution (during early stages of biocrust establishment) under diurnal cycles and the associated dynamics of biogeochemical fluxes at different hydration conditions. The study offers new insights into the highly dynamic and localised processes performed by microbial communities within thin desert biocrusts.

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Estimating global carbon uptake by lichens and bryophytes with a process-based model

Cited by 127 publications

References 145 publications

Climatic and soil texture threshold values for cryptogamic cover development: a meta analysis

Climatic and soil texture threshold values for cryptogamic cover development: a meta analysis

Earliest land plants created modern levels of atmospheric oxygen

Hydration status and diurnal trophic interactions shape microbial community function in desert biocrusts

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