Impact of warming and reduced precipitation on photosynthetic and remote sensing properties of peatland vegetation

Rastogi, Anshu; Stróżecki, Marcin; Kalaji, Hazem M.; Łuców, Dominika; Lamentowicz, Mariusz; Juszczak, Radosław

doi:10.1016/j.envexpbot.2019.01.005

Cited by 45 publications

(29 citation statements)

References 38 publications

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“…It rather corroborates the most recent model simulation and experiment of the peatland C sink with warming (Gallego-Sala et al, 2018;Laine et al, 2019). While our results are reassuring in showing that the natural peatland C sink may remain in future, none of the potential changes in vascular plant performance have been taken into account (Gavazov et al, 2018;McPartland et al, 2019;Rastogi et al, 2019). Vascular plants may differ from Sphagnum mosses in their sensitivity to rising temperatures and soil moisture Dieleman, Branfireun, McLaughlin, & Lindo, 2015;Mäkiranta et al, 2018;Rastogi et al, 2019), and exert powerful braking effects on potential benefits of climate warming on Sphagnum photosynthesis (Bragazza et al, 2016;Gavazov et al, 2018;Jassey et al, 2018).…”

Section: Discussionsupporting

confidence: 87%

Effects of climate warming on Sphagnum photosynthesis in peatlands depend on peat moisture and species‐specific anatomical traits

Jassey

Signarbieux

2019

Global Change Biology

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Climate change will influence plant photosynthesis by altering patterns of temperature and precipitation, including their variability and seasonality. Both effects may be important for peatlands as the carbon (C) sink potential of these ecosystems depends on the balance between plant C uptake through photosynthesis and microbial decomposition. Here, we show that the effect of climate warming on Sphagnum community photosynthesis toggles from positive to negative as the peatland goes from rainy to dry periods during summer. More particularly, we show that mechanisms of compensation among the dominant Sphagnum species (Sphagnum fallax and Sphagnum medium) stabilize the average photosynthesis and productivity of the Sphagnum community during summer despite rising temperatures and frequent droughts. While warming had a negligible effect on S. medium photosynthetic capacity (Amax) during rainy periods, Amax of S. fallax increased by 40%. On the opposite, warming exacerbated the negative effects of droughts on S. fallax with an even sharper decrease of its Amax while S. medium Amax remained unchanged. S. medium showed a remarkable resistance to droughts due to anatomical traits favouring its water holding capacity. Our results show that different phenotypic plasticity among dominant Sphagnum species allow the community to cope with rising temperatures and repeated droughts, maintaining similar photosynthesis and productivity over summer in warmed and control conditions. These results are important because they provide information on how soil water content may modulate the effects of climate warming on Sphagnum productivity in boreal peatlands. It further confirms the transitory nature of warming‐induced photosynthesis benefits in boreal systems and highlights the vulnerability of the ecosystem to excess warming and drying.

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Section: Discussionsupporting

confidence: 87%

Effects of climate warming on Sphagnum photosynthesis in peatlands depend on peat moisture and species‐specific anatomical traits

Jassey

Signarbieux

2019

Global Change Biology

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“…However, a proportion of this energy is released in the form of heat and fluorescence. When the electron transport in the photosynthetic system is partially or completely blocked due to a stress factor, the emitted fluorescence intensity increases, reflecting less use of photosynthetically active radiation by plants [12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Early Identification of Herbicide Modes of Action by the Use of Chlorophyll Fluorescence Measurements

Hassannejad

Lotfi

Ghafarbi

et al. 2020

Plants

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The effect of seven herbicides (U-46 Combi Fluid, Cruz, MR, Basagran Bromicide, Lumax, and Gramoxone) on Xanthium strumarium plants was studied. Chlorophyll content and fluorescence, leaf temperature, and stomatal conductance were evaluated at 12 h, 36 h, 60 h, and 84 h after herbicides application. U46 Combi Fluid, Cruz, and MR did not have a significant effect on chlorophyll fluorescence induction curves as compared to the control treatment. However, Basagran, Bromicide, Lumax, and Gramoxone showed significant changes in the shape of polyphasic fluorescence transients (OJIP transients). Variations in chlorophyll content index, leaf temperature, and stomatal conductance parameters were dependent on the type of applied herbicide. Our study revealed that the specific impact of the applied herbicides on the photosynthetic efficiency of plants is related to their chemical groups and their mechanism of action.

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“…Schmidtlein et al [33] demonstrated the potential of hyperspectral reflectance that provides wide knowledge into spatial ecological patterns of peatland vegetation. Rastogi et al [34,35] showed the impact of environmental manipulation on peatland surfaces using simple hyperspectral indices. Considering the above research, no studies have considered SIF and VIs and their relationships over the peatland surface.…”

Section: Introductionmentioning

confidence: 99%

Hyplant-Derived Sun-Induced Fluorescence—A New Opportunity to Disentangle Complex Vegetation Signals from Diverse Vegetation Types

et al. 2019

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Hyperspectral remote sensing (RS) provides unique possibilities to monitor peatland vegetation traits and their temporal dynamics at a fine spatial scale. Peatlands provide a vital contribution to ecosystem services by their massive carbon storage and wide heterogeneity. However, monitoring, understanding, and disentangling the diverse vegetation traits from a heterogeneous landscape using complex RS signal is challenging, due to its wide biodiversity and distinctive plant species composition. In this work, we aim to demonstrate, for the first time, the large heterogeneity of peatland vegetation traits using well-established vegetation indices (VIs) and Sun-Induced Fluorescence (SIF) for describing the spatial heterogeneity of the signals which may correspond to spatial diversity of biochemical and structural traits. SIF originates from the initial reactions in photosystems and is emitted at wavelengths between 650–780 nm, with the first peak at around 687 nm and the second peak around 760 nm. We used the first HyPlant airborne data set recorded over a heterogeneous peatland area and its surrounding ecosystems (i.e., forest, grassland) in Poland. We deployed a comparative analysis of SIF and VIs obtained from differently managed and natural vegetation ecosystems, as well as from diverse small-scale peatland plant communities. Furthermore, spatial relationships between SIF and VIs from large-scale vegetation ecosystems to small-scale peatland plant communities were examined. Apart from signal variations, we observed a positive correlation between SIF and greenness-sensitive VIs, whereas a negative correlation between SIF and a VI sensitive to photosynthesis was observed for large-scale vegetation ecosystems. In general, higher values of SIF were associated with higher biomass of vascular plants (associated with higher Leaf Area Index (LAI)). SIF signals, especially SIF760, were strongly associated with the functional diversity of the peatland vegetation. At the peatland area, higher values of SIF760 were associated with plant communities of high perennials, whereas, lower values of SIF760 indicated peatland patches dominated by Sphagnum. In general, SIF760 reflected the productivity gradient on the fen peatland, from Sphagnum-dominated patches with the lowest SIF and fAPAR values indicating lowest productivity to the Carex-dominated patches with the highest SIF and fAPAR values indicating highest productivity.

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Impact of warming and reduced precipitation on photosynthetic and remote sensing properties of peatland vegetation

Cited by 45 publications

References 38 publications

Effects of climate warming on Sphagnum photosynthesis in peatlands depend on peat moisture and species‐specific anatomical traits

Effects of climate warming on Sphagnum photosynthesis in peatlands depend on peat moisture and species‐specific anatomical traits

Early Identification of Herbicide Modes of Action by the Use of Chlorophyll Fluorescence Measurements

Hyplant-Derived Sun-Induced Fluorescence—A New Opportunity to Disentangle Complex Vegetation Signals from Diverse Vegetation Types

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