Lack of photosynthetic or stomatal regulation after 9 years of elevated [<scp><scp>CO<sub>2</sub></scp></scp>] and 4 years of soil warming in two conifer species at the alpine treeline

Streit, Kathrin; Siegwolf, Rolf; Hagedorn, Frank; Schaub, Marcus; Buchmann, Nina

doi:10.1111/pce.12197

Cited by 58 publications

(75 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, the temperature increase in the present experiment was relatively minor (approximately 3°C), which may have been insufficient to affect the composition and balance of inorganic carbon in the water column and thus may have further influenced the utilization of inorganic carbon in V. natans. A recent study produced similar results, indicating that soil warming had little effect on the gas exchange of plants at the alpine treeline (Streit et al 2014). The individual ramet biomass of V. natans decreased with elevated temperature, but only significantly at ambient CO 2 .…”

Section: Discussionmentioning

confidence: 51%

Responses of the submerged macrophyte Vallisneria natans to elevated CO2 and temperature

Cao¹,

Ruan²

2015

Aquat. Biol.

View full text Add to dashboard Cite

Inorganic carbon and temperature are 2 important factors that regulate the growth of submerged macrophytes. However, experimental evidence regarding the eco-physiological changes that occur in submerged macrophytes in response to elevated CO 2 and temperature is still limited. To investigate how the submerged macrophyte Vallisneria natans (Hydrocharitaceae), a common species in the waters of the middle and lower reaches of the Yangtze River, responds to these factors, we conducted a mesocosm experiment using simulated CO 2 elevation (by bubbling CO 2 into experimental water) and ambient temperature warming systems. During the 60 d experiment, CO 2 elevation significantly increased the inorganic carbon concentration in the water column. The warming systems elevated average water temperature by approximately 3°C. The elevation of CO 2 levels significantly enhanced the photosynthetic performance, growth and clonal propagation of V. natans. When combined with an increase in CO 2 , elevated temperatures also promoted photosynthesis and growth. The individual ramet biomass of V. natans decreased with increasing temperature, but only significantly under ambient CO 2 levels. CO 2 elevation increased both stolon elongation and bud number. At elevated CO 2 concentration, more biomass was allocated to the stolons, roots and buds, while less biomass was allocated to the leaves. These results indicate that the eco-physiological responses of V. natans should increase its stress tolerance in aquatic plant communities under future spatial and temporal variation in CO 2 levels, however, further research is required.

show abstract

Section: Discussionmentioning

confidence: 51%

Responses of the submerged macrophyte Vallisneria natans to elevated CO2 and temperature

Cao¹,

Ruan²

2015

Aquat. Biol.

View full text Add to dashboard Cite

show abstract

“…More detailed information can be derived from the individual carbohydrates (sucrose, glucose, and fructose), and sugar alcohols (e.g., pinitol), but also from compounds like organic acids (malate and citrate) that are involved in more "downstream metabolic processes" leading to systematic but varying 13 C-enrichment of sink organs (such as stem) in comparison to leaves [20]. Thus far, there have been few investigations analyzing δ 13 C of individual carbohydrates and organic acids [19][20][21][22][23][24][25][26] using high-performance liquid chromatography (HPLC). However, even fewer investigations were applied in natural forest ecosystems to address questions of tree eco-physiology [19,22,23,26,27].…”

Section: Introductionmentioning

confidence: 99%

“…Thus far, there have been few investigations analyzing δ 13 C of individual carbohydrates and organic acids [19][20][21][22][23][24][25][26] using high-performance liquid chromatography (HPLC). However, even fewer investigations were applied in natural forest ecosystems to address questions of tree eco-physiology [19,22,23,26,27]. Therefore, further studies are needed to understand how environmental changes impact δ 13 C values and concentrations of individual compounds at the leaf level in declining trees.…”

Section: Introductionmentioning

confidence: 99%

Compound-Specific Carbon Isotopes and Concentrations of Carbohydrates and Organic Acids as Indicators of Tree Decline in Mountain Pine

Churakova

Lehmann

Saurer

et al. 2018

Forests

View full text Add to dashboard Cite

Abstract:We investigated seasonal variations in δ 13 C values and concentrations of carbohydrates and organic acids in needles of declining and healthy mountain pine (Pinus mugo ssp. uncinata (DC.) Domin) trees from the Swiss National Park (SNP), using compound-specific isotopes analysis (CSIA). Our goal was to study the impact of climatic drivers on the individual compounds and understand the reasons of partial tree declines in relation to healthy mountain pine trees under seasonal weather patterns. We found that temperature is the main climatic driver determining the seasonal carbon dynamics at the needle level. Lower seasonal δ 13 C variability and lower concentration levels of sucrose in needles suggest less photosynthetic activity and sink carbon demand in declining compared to healthy mountain pine trees. Higher concentration levels of hexose (glucose and fructose) can play a reserve function for surviving mechanisms of mountain pine trees. Seasonal patterns of organic acid (malate and citrate) suggest an increasing investment in maintenance and repair mechanisms. The seasonal course of carbohydrates and organic acids can therefore be considered an indicator for a modified carbon metabolism within the leaves and possibly within the other tree tissues, partially explaining the decline of mountain pine trees.

show abstract

“…Some works conducted at some trees grown in Swiss Alps (2,180 m a.s.l.) have shown that the CO 2 -induced increase in photosynthesis has been maintained, and the initial increase in growth rate has also been sustained in Larix deciduas (Handa et al 2006;Dawes et al 2013;Streit et al 2014). Downward adjustment of photosynthetic capacity by -26 % on average under long-term exposure to elevated CO 2 has been observed in Swiss Alps (2,440 m a.s.l., Inauen et al 2012).…”

Section: Introductionmentioning

confidence: 98%

“…Given that CO 2 is the primary substrate for photosynthesis, detailed information on how elevated CO 2 affects leaf level is critical to understand the effects of climate change on the structure, function, and productivity of forest ecosystems (Leakey et al 2009;Han et al 2011). A few studies have focused on the responses of trees growing in high-elevation (HE) areas to elevated CO 2 (Dawes et al 2013;Streit et al 2014). Some works conducted at some trees grown in Swiss Alps (2,180 m a.s.l.)…”

Section: Introductionmentioning

confidence: 99%

Physiological responses of Abies faxoniana populations from different elevations to increased CO2 and N application

Dong

Duan

et al. 2014

Acta Physiol Plant

View full text Add to dashboard Cite

The altitude-related responses to the increased application of CO 2 , N, and their combination were investigated in two Abies faxoniana populations, which originated from a subalpine coniferous forest at elevations of 2,580 and 3,200 m using closed-top chambers. The two contrasting populations were subjected to two CO 2 regimes (350 and 700 lmol mol -1 ) and two N levels (0 and 5 g N m -2 year -1 ). Their net photosynthetic rate, nonstructural carbohydrate concentration, and photosynthetic N use efficiency (PNUE) increased under elevated CO 2 . However, the increases detected in the high-elevation (HE) population were significantly greater than those found in the low-elevation (LE) population. Under elevated CO 2 and N application, the maximal carboxylation rate (V cmax ) increased in HE population, whereas no effects were found on V cmax in LE population. The C to N ratio decreased under N application in both populations. N application also induced the HE population to show greater increases in free amino acids, soluble proteins, N concentration, and PNUE than LE population. These results suggested that the population from HE was more sensitive to elevated CO 2 and (or) N application than LE population. Results of this study provided valuable knowledge for predicting forest development under increased atmospheric CO 2 concentration and (or) N deposition.

show abstract

Lack of photosynthetic or stomatal regulation after 9 years of elevated [CO₂] and 4 years of soil warming in two conifer species at the alpine treeline

Cited by 58 publications

References 49 publications

Responses of the submerged macrophyte Vallisneria natans to elevated CO2 and temperature

Responses of the submerged macrophyte Vallisneria natans to elevated CO2 and temperature

Compound-Specific Carbon Isotopes and Concentrations of Carbohydrates and Organic Acids as Indicators of Tree Decline in Mountain Pine

Physiological responses of Abies faxoniana populations from different elevations to increased CO2 and N application

Contact Info

Product

Resources

About

Lack of photosynthetic or stomatal regulation after 9 years of elevated [CO2] and 4 years of soil warming in two conifer species at the alpine treeline

Cited by 58 publications

References 49 publications

Responses of the submerged macrophyte Vallisneria natans to elevated CO2 and temperature

Responses of the submerged macrophyte Vallisneria natans to elevated CO2 and temperature

Compound-Specific Carbon Isotopes and Concentrations of Carbohydrates and Organic Acids as Indicators of Tree Decline in Mountain Pine

Physiological responses of Abies faxoniana populations from different elevations to increased CO2 and N application

Contact Info

Product

Resources

About

Lack of photosynthetic or stomatal regulation after 9 years of elevated [CO₂] and 4 years of soil warming in two conifer species at the alpine treeline