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• W2992201242 abstract "Abstract In temperate alpine environments, the short growing season, low temperature and a slow nutrient cycle may restrict plant growth more than carbon (C) assimilation does. To test whether C is a limiting resource, we applied a shade gradient from ambient light to 44% (maximum shade) of incident photon flux density (PFD) in late successional, Carex curvula‐ dominated alpine grassland at 2,580 m elevation in the Swiss central Alps for 3 years (2014–2016). Total aboveground biomass did not significantly decrease under reduced PFD, with a confidence interval ranging from +4% to −15% biomass in maximum shade. Belowground biomass, of which more than 80% were fine roots, was significantly reduced by a mean of 17.9 ± 4.6% (± SE ), corresponding to 228 g/m 2 , in maximum shade in 2015 and 2016. This suggests reduced investments into water and nutrient acquisition according to the functional equilibrium concept. Specific leaf area (SLA) and maximum leaf length of the most abundant species increased with decreasing PFD. Foliar concentration of nonstructural carbohydrates (NSC) was reduced by 12.5 ± 4.3% under maximum shade (mean of eight tested species), while NSC concentration of belowground storage organs were unchanged in the four most abundant forbs. Furthermore, maximum shade lowered foliar δ 13 C by 1.56 ± 0.35‰ and increased foliar nitrogen concentrations per unit dry mass by 18.8 ± 4.1% across six species in 2015. However, based on unit leaf area, N concentrations were lower in shade (effect of higher SLA). Thus, while we found typical morphological and physiological plant responses to lower light, shading did not considerably affect seasonal aboveground biomass production of this alpine plant community within a broad range of PFD. This suggests that C is not a growth‐limiting resource, matching the unresponsiveness to in situ CO 2 enrichment previously reported for this type of grassland." @default.
• W2992201242 created "2019-12-13" @default.
• W2992201242 creator A5047672662 @default.
• W2992201242 creator A5075149019 @default.
• W2992201242 creator A5076734929 @default.
• W2992201242 date "2020-01-26" @default.
• W2992201242 modified "2023-10-06" @default.
• W2992201242 title "Halving sunlight reveals no carbon limitation of aboveground biomass production in alpine grassland" @default.
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• W2992201242 doi "https://doi.org/10.1111/gcb.14949" @default.
• W2992201242 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/31799736" @default.
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