Climate variability, tree increment patterns and ENSO-related carbon sequestration reduction of the tropical dry forest species Loxopterygium huasango of Southern Ecuador

Spannl, Susanne; Volland, Franziska; Pucha, Darwin; Peters, Thorsten; Cueva, Eduardo; Bräuning, Achim

doi:10.1007/s00468-016-1362-0

Cited by 25 publications

(15 citation statements)

References 65 publications

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“…Most general circulation models (GCMs) predict an increase in annual precipitation in northwestern Peru and southern Ecuador, but a decrease in dry season precipitation, especially in the lowland forests. Previous studies suggest that marked drought events can engender strong negative impacts on the recruitment, survival and growth rates of TDF tree species (Castro, Sanchez-Azofeifa, & Sato, 2018;Maza-Villalobos, Poorter, & Martínez-Ramos, 2013;Spannl et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Mapping tree species vulnerability to multiple threats as a guide to restoration and conservation of tropical dry forests

Fremout

Thomas²,

Gaisberger

et al. 2020

Global Change Biology

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Understanding the vulnerability of tree species to anthropogenic threats is important for the efficient planning of restoration and conservation efforts. We quantified and compared the effects of future climate change and four current threats (fire, habitat conversion, overgrazing and overexploitation) on the 50 most common tree species of the tropical dry forests of northwestern Peru and southern Ecuador. We used an ensemble modelling approach to predict species distribution ranges, employed freely accessible spatial datasets to map threat exposures, and developed a trait-based scoring approach to estimate species-specific sensitivities, using differentiated trait weights in accordance with their expected importance in determining species sensitivities to specific threats. Species-specific vulnerability maps were constructed from the product of the exposure maps and the sensitivity estimates. We found that all 50 species face considerable threats, with an average of 46% of species' distribution ranges displaying high or very high vulnerability to at least one of the five threats. Our results suggest that current levels of habitat conversion, overexploitation and overgrazing pose larger threats to most of the studied species than climate change. We present a spatially explicit planning strategy for species-specific restoration and conservation actions, proposing management interventions to focus on (a) in situ conservation of tree populations and seed collection for tree planting activities in areas with low vulnerability to climate change and current threats; (b) ex situ conservation or translocation of populations in areas with high climate change vulnerability; and (c) active planting or assisted regeneration in areas under high current threat vulnerability but low climate change vulnerability, provided that interventions are in place to lower threat pressure. We provide an online, user-friendly tool to visualize both the vulnerability maps and the maps indicating priority restoration and conservation actions. K E Y W O R D S functional traits, multithreat vulnerability, restoration and conservation planning, sensitivity, tropical dry forest FREMOUT ET al. | 3553Vulnerability

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Section: Introductionmentioning

confidence: 99%

Mapping tree species vulnerability to multiple threats as a guide to restoration and conservation of tropical dry forests

Fremout

Thomas²,

Gaisberger

et al. 2020

Global Change Biology

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“…The balance between CO 2 sink and source during drought is important because future drought in tropical regions may increase in frequency and severity because of global climate change [55]. These adverse weather conditions cause a reduction in tree growth, showing the serious impact of such climate extremes on carbon sequestration in dry tropical forest ecosystems [56]. Collectively, the results of the present study offer insights on photosynthesis and carbon assimilation dynamics in Z. serrata plantations, which could facilitate the assessment and management of plantation species under projected climate change.…”

Section: Seasonal Carbon Assimilationmentioning

confidence: 99%

Seasonal Photosynthesis and Carbon Assimilation of Dynamics in a Zelkova serrata (Thunb.) Makino Plantation

Chen

Wang

Lin

et al. 2021

Forests

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As anthropogenic greenhouse gas emissions intensify global climate change, plantations have become an important tool to mitigate atmospheric CO2. Our aim in this study was to estimate carbon assimilation and clarify the impact of environmental factors on the photosynthesis of Zelkova serrata (Thunb.) Makino, an important plantation species that is extensively planted in low altitude regions of East Asia. We measured monthly gas exchange parameters and leaf area index to estimate carbon assimilation. The results showed that gas exchange was significantly affected by vapor pressure deficit and temperature, especially in the dry season, and both photosynthetic rate and carbon assimilation decreased. Lower daytime assimilation and higher nighttime respiration during the dry season, which caused a 43% decrease in carbon assimilation in Z. serrata plantations. Z. serrata exhibited lower photosynthetic rate and lower carbon assimilation following planting in a tropical monsoon climate area. Therefore, the effects of extreme weather such as high temperature and vapor pressure deficit on Z. serrata forest carbon budget could be stronger in the future. Leaf area showed seasonal variation, and severe defoliation was caused by a typhoon in the summer. The annual carbon assimilation was estimated at 3.50 Mg C ha−1 year−1 in the study area.

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Section: Seasonal Carbon Assimilationmentioning

confidence: 99%

Drought Impact on Carbon Assimilation of A Zelkova Serrata Plantation

Chen

Wang

Lin

et al. 2021

Preprint

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Background: As anthropogenic greenhouse gas emissions intensify global climate change, plantations have become an important tool to mitigate atmospheric CO2. Our aim in this study was to estimate carbon assimilation and clarify the impact of environmental factors on the photosynthesis of Zelkova serrata, an important plantation species, which extensively planted in low altitude of East Asia.Results: We measured monthly gas exchange parameters and leaf area to estimate carbon assimilation. The results showed that gas exchange was significantly affected by vapor pressure deficit and temperature, especially in the dry season, and both photosynthetic rate and carbon assimilation decreased. However, drought led to lower daytime assimilation and higher night-time respiration, which caused a 43% decrease in carbon assimilation. Additionally, the poor site quality and environmental stress may impact the growth and carbon assimilation of this species.Conclusions: Z. serrata may not be suitable for planting in a tropical monsoon climate area. Therefore, the effects of extreme weather on the forest carbon budget may be stronger in the future. Leaf area showed seasonal variation and serious defoliation caused by a typhoon in the summer. The monthly leaf assimilation rate was 0.88–4.17 μmol CO2 m-2 s-1, which was estimated to assimilate 3.50 Mg C ha-1 yr-1 in the study area.

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Climate variability, tree increment patterns and ENSO-related carbon sequestration reduction of the tropical dry forest species Loxopterygium huasango of Southern Ecuador

Cited by 25 publications

References 65 publications

Mapping tree species vulnerability to multiple threats as a guide to restoration and conservation of tropical dry forests

Mapping tree species vulnerability to multiple threats as a guide to restoration and conservation of tropical dry forests

Seasonal Photosynthesis and Carbon Assimilation of Dynamics in a Zelkova serrata (Thunb.) Makino Plantation

Drought Impact on Carbon Assimilation of A Zelkova Serrata Plantation

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