Environmental drivers of Sphagnum growth in peatlands across the Holarctic region. Bengtsson, F., Rydin, H., Baltzer, J. L., Bragazza, L., Bu, Z., Caporn, S. J. M., Dorrepaal, E., Flatberg, K. I., Galanina, O., Gałka, M., Ganeva, A., Goia, I., Goncharova, N., Hájek, M., Haraguchi, A., Harris, L. I., Humphreys, E., Jiroušek, M., Kajukało, K., Karofeld, E., Koronatova, N. G., Kosykh, N. P., Laine, A. M., Lamentowicz, M., Lapshina, E., Limpens, J., Linkosalmi, M., Ma, J., Mauritz, M., Mitchell, E. A. D., Munir, T. M., Natali, S. M., Natcheva, R., Payne, R. J., Philippov, D. A., Rice, S. K., Robinson, S., Robroek, B. J. M., Rochefort, L., Singer, D., Stenøien, H. K., Tuittila, E., Vellak, K., Waddington, J. M., & Granath, G. Journal of Ecology, 109(1):417–431, January, 2021. Publisher: John Wiley & Sons, Ltd
Environmental drivers of Sphagnum growth in peatlands across the Holarctic region [link]Paper  doi  abstract   bibtex   
Abstract The relative importance of global versus local environmental factors for growth and thus carbon uptake of the bryophyte genus Sphagnum?the main peat-former and ecosystem engineer in northern peatlands?remains unclear. We measured length growth and net primary production (NPP) of two abundant Sphagnum species across 99 Holarctic peatlands. We tested the importance of previously proposed abiotic and biotic drivers for peatland carbon uptake (climate, N deposition, water table depth and vascular plant cover) on these two responses. Employing structural equation models (SEMs), we explored both indirect and direct effects of drivers on Sphagnum growth. Variation in growth was large, but similar within and between peatlands. Length growth showed a stronger response to predictors than NPP. Moreover, the smaller and denser Sphagnum fuscum growing on hummocks had weaker responses to climatic variation than the larger and looser Sphagnum magellanicum growing in the wetter conditions. Growth decreased with increasing vascular plant cover within a site. Between sites, precipitation and temperature increased growth for S. magellanicum. The SEMs indicate that indirect effects are important. For example, vascular plant cover increased with a deeper water table, increased nitrogen deposition, precipitation and temperature. These factors also influenced Sphagnum growth indirectly by affecting moss shoot density. Synthesis. Our results imply that in a warmer climate, S. magellanicum will increase length growth as long as precipitation is not reduced, while S. fuscum is more resistant to decreased precipitation, but also less able to take advantage of increased precipitation and temperature. Such species-specific sensitivity to climate may affect competitive outcomes in a changing environment, and potentially the future carbon sink function of peatlands.
@article{bengtsson_environmental_2021,
	title = {Environmental drivers of {Sphagnum} growth in peatlands across the {Holarctic} region},
	volume = {109},
	issn = {0022-0477},
	url = {https://doi.org/10.1111/1365-2745.13499},
	doi = {10.1111/1365-2745.13499},
	abstract = {Abstract The relative importance of global versus local environmental factors for growth and thus carbon uptake of the bryophyte genus Sphagnum?the main peat-former and ecosystem engineer in northern peatlands?remains unclear. We measured length growth and net primary production (NPP) of two abundant Sphagnum species across 99 Holarctic peatlands. We tested the importance of previously proposed abiotic and biotic drivers for peatland carbon uptake (climate, N deposition, water table depth and vascular plant cover) on these two responses. Employing structural equation models (SEMs), we explored both indirect and direct effects of drivers on Sphagnum growth. Variation in growth was large, but similar within and between peatlands. Length growth showed a stronger response to predictors than NPP. Moreover, the smaller and denser Sphagnum fuscum growing on hummocks had weaker responses to climatic variation than the larger and looser Sphagnum magellanicum growing in the wetter conditions. Growth decreased with increasing vascular plant cover within a site. Between sites, precipitation and temperature increased growth for S. magellanicum. The SEMs indicate that indirect effects are important. For example, vascular plant cover increased with a deeper water table, increased nitrogen deposition, precipitation and temperature. These factors also influenced Sphagnum growth indirectly by affecting moss shoot density. Synthesis. Our results imply that in a warmer climate, S. magellanicum will increase length growth as long as precipitation is not reduced, while S. fuscum is more resistant to decreased precipitation, but also less able to take advantage of increased precipitation and temperature. Such species-specific sensitivity to climate may affect competitive outcomes in a changing environment, and potentially the future carbon sink function of peatlands.},
	number = {1},
	urldate = {2023-07-21},
	journal = {Journal of Ecology},
	author = {Bengtsson, Fia and Rydin, Håkan and Baltzer, Jennifer L. and Bragazza, Luca and Bu, Zhao-Jun and Caporn, Simon J. M. and Dorrepaal, Ellen and Flatberg, Kjell Ivar and Galanina, Olga and Gałka, Mariusz and Ganeva, Anna and Goia, Irina and Goncharova, Nadezhda and Hájek, Michal and Haraguchi, Akira and Harris, Lorna I. and Humphreys, Elyn and Jiroušek, Martin and Kajukało, Katarzyna and Karofeld, Edgar and Koronatova, Natalia G. and Kosykh, Natalia P. and Laine, Anna M. and Lamentowicz, Mariusz and Lapshina, Elena and Limpens, Juul and Linkosalmi, Maiju and Ma, Jin-Ze and Mauritz, Marguerite and Mitchell, Edward A. D. and Munir, Tariq M. and Natali, Susan M. and Natcheva, Rayna and Payne, Richard J. and Philippov, Dmitriy A. and Rice, Steven K. and Robinson, Sean and Robroek, Bjorn J. M. and Rochefort, Line and Singer, David and Stenøien, Hans K. and Tuittila, Eeva-Stiina and Vellak, Kai and Waddington, James Michael and Granath, Gustaf},
	month = jan,
	year = {2021},
	note = {Publisher: John Wiley \& Sons, Ltd},
	keywords = {\#nosource, PAR, climate, global change, net primary production, nitrogen deposition, peat mosses, plant–climate interactions, structural equation model},
	pages = {417--431},
}
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