Moss responses to elevated CO2 and variation in hydrology in a temperate lowland peatland

Toet, Sylvia; Cornelissen, Johannes H. C.; Aerts, Rien; Logtestijn, Richard S. P. van; Beus, Miranda de; Stoevelaar, R.

doi:10.1007/978-1-4020-4443-4_3

Cited by 12 publications

(6 citation statements)

References 46 publications

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“…Shading has been found to significantly reduce the C:N ratio of Sphagnum capitula from~54 to~27 from peat mesocosms removed from a raised bog in Upper Teesdale, UK (Bonnett, Ostle, & Freeman, 2010). Although C:N over 100 has been reported for Sphagnum litter (Asada, Warner, & Aravena, 2005), several studies report values similar to this study of 30-50 (e.g., Limpens, Berendse, & Klees, 2003;Péli, Nagy, & Cserhalmi, 2016;Toet et al, 2006). We also observed that C:N ratio of Sphagnum was similar to the leaves of R. groenlandicum, a result consistent with reported C:N ratios from a range of plant functional types in a shrubby ombrotrophic bog in eastern Canada (Wang & Moore, 2014).…”

Section: Effect Of Wt On Peat Nutrient Dynamicssupporting

confidence: 90%

Mineral nitrogen and phosphorus pools affected by water table lowering and warming in a boreal forested peatland

Munir

Khadka

et al. 2017

Ecohydrology

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Changes in atmospheric temperature and lowering in water‐table (WT) are expected to affect peatland nutrient dynamics. To understand the response of peatland nitrogen (N) and phosphorus (P) dynamics to warming and drainage in a continental wooded‐bog of hummock–hollow microtopography, we compared three sites: (a) control, (b) recently drained (2–3 years; experimental), and (c) older drained (12–13 years; drained), during 2013. The WT was lowered at experimental and drained sites to 74 and 120 cm, respectively, whereas a warming of ~1 °C was created at one half of the microforms using open‐top chambers. Responses of peat total inorganic nitrogen (TIN = nitrate nitrogen [NO3−‐N] + ammonium nitrogen [NH4+‐N]) and phosphate‐P (PO43−‐P) pools and vegetation C:N ratio, δ13C and δ15N to the experimental treatments were investigated across sites/microforms and over time. Peat TIN available and extractable pools increased with deepening of WT and over time and were greater at hummocks relative to hollows. In contrast, the PO4 pools increased with short‐term drainage but reverted to very close to their original (control) nutrient values in the longer term. The WT and warming driven change in the peat TIN pool was strongly reflected in the vascular vegetation C:N ratio and shrub δ13C and δ15N, whereas moss nutrient dynamics did not vary between sites. Therefore, we suggest that atmospheric warming combined with WT deepening can increase availability of mineral N and P, which then can be reflected in vascular vegetation and hence modify the productivity and ecosystem functioning of the northern midlatitude continental wooded bogs in the long term.

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Section: Effect Of Wt On Peat Nutrient Dynamicssupporting

confidence: 90%

Mineral nitrogen and phosphorus pools affected by water table lowering and warming in a boreal forested peatland

Munir

Khadka

et al. 2017

Ecohydrology

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“…We reviewed studies where lichens and bryophytes were treated with elevated ambient CO 2 levels and their growth was measured. While some studies did not find any significant effects 56 57 58 , others found partly strong increases in NPP at elevated CO 2 (refs 59 , 60 , 61 , 62 , 63 , 64 , 65 ). Figure 4b shows a summary of those studies.…”

Section: Methodsmentioning

confidence: 94%

“…In some cases where NPP did not increase at elevated levels of ambient CO 2 or decreased again after a longer period of fertilization, phosphorus limitation was suggested as an explanation 56 57 . These studies were, however, conducted with moss growing in peatlands or similar environments, where the access to rock substrates is limited.…”

Section: Methodsmentioning

confidence: 99%

High potential for weathering and climate effects of non-vascular vegetation in the Late Ordovician

et al. 2016

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It has been hypothesized that predecessors of today's bryophytes significantly increased global chemical weathering in the Late Ordovician, thus reducing atmospheric CO2 concentration and contributing to climate cooling and an interval of glaciations. Studies that try to quantify the enhancement of weathering by non-vascular vegetation, however, are usually limited to small areas and low numbers of species, which hampers extrapolating to the global scale and to past climatic conditions. Here we present a spatially explicit modelling approach to simulate global weathering by non-vascular vegetation in the Late Ordovician. We estimate a potential global weathering flux of 2.8 (km3 rock) yr−1, defined here as volume of primary minerals affected by chemical transformation. This is around three times larger than today's global chemical weathering flux. Moreover, we find that simulated weathering is highly sensitive to atmospheric CO2 concentration. This implies a strong negative feedback between weathering by non-vascular vegetation and Ordovician climate.

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“…In arid and semiarid deserts, many bryophytes species are major components of biotic crusts, which are the pioneers in succession of desert communities and thus play an important role in sand dune fixation (Barker et al 2005;Xu et al 2005). As dominant species, the bryophytes play a critical role in the development and maintenance of bogs, alpine tundra, and Antarctic ecosystems (Harley et al 1989;Uchida et al 2002;Pannewitz et al 2003;Bragazza et al 2005;Dunn and Robinson 2006;Toet et al 2006;Gornall et al 2007). Even in forest ecosystems where bryophytes tend to be neglected, the group of species are found to contribute largely to species diversity and carbon fixation (DeLucia et al 2003).…”

Section: Introductionmentioning

confidence: 99%

Photosynthetic response to dynamic changes of light and air humidity in two moss species from the Tibetan Plateau

Cui

et al. 2008

Ecological Research

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Bryophytes are widely distributed in alpine meadow and wetlands on the Tibetan Plateau, where light intensity and air moisture are highly variable in time. To address how bryophytes respond to their light and moisture environments, we examined dynamic photosynthesis in two moss species, Distichium inclinatum common in meadow, and Encalypta alpine frequently found in wetland. Photosynthetic induction response was faster in the two moss species than in most vascular species. In both species the 90% induction time after a sudden light increase from 50 to 600 lmol m À2 s À1 was within 3 min. The induction was faster in mosses experiencing a period of weak light than in those in total darkness. E. alpina, the wetland species, showed more rapid induction response and shorter post-illumination CO 2 fixation to sunflecks than D. inclinatum, the meadow species. Photosynthetic rate (A max ) under saturated light in the two species increased linearly with increasing air relative humidity (RH). The meadow species D. inclinatum showed higher A max under low RHs, but exhibited lower A max under high RHs in comparison with the wetland moss E. alpina. Moreover, the quantum efficiency increased linearly with increasing RH, indicating that air humidity plays a critical role in photochemical activities in the alpine mosses. The study suggests that there are acclimations in dynamic photosynthesis in response to light and humidity, and the acclimations would benefit a high leaf carbon gain in the two alpine moss species in their common habitats.

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Moss responses to elevated CO2 and variation in hydrology in a temperate lowland peatland

Cited by 12 publications

References 46 publications

Mineral nitrogen and phosphorus pools affected by water table lowering and warming in a boreal forested peatland

Mineral nitrogen and phosphorus pools affected by water table lowering and warming in a boreal forested peatland

High potential for weathering and climate effects of non-vascular vegetation in the Late Ordovician

Photosynthetic response to dynamic changes of light and air humidity in two moss species from the Tibetan Plateau

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