Topography and Tree Species Improve Estimates of Spatial Variation in Soil Greenhouse Gas Fluxes in a Subtropical Forest

Quebbeman, Andrew W.; Menge, Duncan N. L.; Zimmerman, Jess K.; Uriarte, María

doi:10.1007/s10021-021-00677-x

Cited by 4 publications

(4 citation statements)

References 60 publications

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“…Model results showed a significant negative effect of inclination, with lower soil CO 2 emissions on sloped locations. This is contrary to our first hypothesis and to the findings of studies from temperate and boreal forests in North America (Creed et al, 2013;Warner et al, 2018), where soil CO 2 emissions were highest in sloped locations compared to ridge and flat locations, while a subtropical forest in Puerto Rico showed only a weak relation between CO 2 fluxes and topographic variation (Quebbeman et al, 2022). However, our results suggest that higher CO 2 emissions at flat locations were mainly driven by CG5, where we observed the highest CO 2 emissions.…”

Section: Soil Co 2 Emissionscontrasting

confidence: 99%

“…In agreement with our third hypothesis, N 2 O emissions were significantly lower in sloped locations with lower soil moisture content, which was also found by other forest soil studies in France (Vilain et al, 2012), Kenya (Arias-Navarro et al, 2017), Australia (Butterbach-Bahl et al, 2004), and Ecuador (Lamprea Pineda et al, 2021); however, this is the opposite of the findings in forests in China (Yu et al, 2021) and in Puerto Rico (Quebbeman et al, 2022). Furthermore, N 2 O emissions in flat positions increased with increasing soil temperature.…”

Section: Effect Of Inclination and Distance From The Stream On Soil N...supporting

confidence: 93%

“…This is also the opposite of the findings of other studies that did find an inclination effect. However, the studies are not in agreement as to where uptake is higher: in a subtropical forest in Puerto Rico, higher CH 4 uptake on ridges was found as compared to in valleys (Quebbeman et al, 2022); in a temperate forest in Maryland, USA, CH 4 uptake was higher in transition zones than uplands and valley bottoms were occasionally large net sources (Warner et al, 2018); and in a tropical forest in China, hillslopes were found to be hotspots for CH 4 uptake, while the slope foot and groundwater discharge zone contributed less (Yu et al, 2021). Nonetheless, soil CH 4 uptake was significantly higher at CG15 compared to CG0.5, suggesting that the distance from the stream did have an effect on CH 4 uptake; the two other distances were potentially not far enough from the stream for them to have a significant effect on the soil moisture, soil temperature, and soil parameters that would lead to an effect on the CH 4 uptake.…”

Section: Ch 4 Uptakementioning

confidence: 71%

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Land inclination controls CO₂ and N₂O fluxes, but not CH₄ uptake, in a temperate upland forest soil

Gillespie,

Triches,

Abalos

et al. 2023

SOIL

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Abstract. Inclination and spatial variability in soil and litter properties influence soil greenhouse gas (GHG) fluxes and thus ongoing climate change, but their relationship in forest ecosystems is poorly understood. To elucidate this, we explored the effect of inclination, distance from a stream, soil moisture, soil temperature, and other soil and litter properties on soil–atmosphere fluxes of carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) with automated static chambers in a temperate upland forest in eastern Austria. We hypothesised that soil CO2 emissions and CH4 uptake are higher in sloped locations with lower soil moisture content, whereas soil N2O emissions are higher in flat, wetter locations. During the measurement period, soil CO2 emissions were significantly higher on flat locations (p<0.05), and increased with increasing soil temperature (p<0.001) and decreasing soil moisture (p<0.001). The soil acted as a CH4 sink, and CH4 uptake was not significantly related to inclination. However, CH4 uptake was significantly higher at locations furthest away from the stream as compared to at the stream (p<0.001) and positively related to litter weight and soil C content (p<0.01). N2O fluxes were significantly higher on flat locations and further away from the stream (p<0.05) and increased with increasing soil moisture (p<0.001), soil temperature (p<0.001), and litter depth (p<0.05). Overall, this study underlines the importance of inclination and the resulting soil and litter properties in predicting GHG fluxes from forest soils and therefore their potential source-sink balance.

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Section: Soil Co 2 Emissionscontrasting

confidence: 99%

Section: Effect Of Inclination and Distance From The Stream On Soil N...supporting

confidence: 93%

Section: Ch 4 Uptakementioning

confidence: 71%

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Land inclination controls CO₂ and N₂O fluxes, but not CH₄ uptake, in a temperate upland forest soil

Gillespie,

Triches,

Abalos

et al. 2023

SOIL

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“…Over past decades, a number of field studies have been conducted to clarify the effects of plant species changes on soil GHG fluxes in forest ecosystems (Chen et al, 2020;Hsieh et al, 2021;Lee et al, 2022). However, most studies focus on forest ecosystems dominated by different tree components (Liu et al, 2014;Mazza et al, 2021;Quebbeman et al, 2021). Little attention has been paid to components of the understory (e.g., dwarf shrubs, mosses, and lichens) on soil GHG fluxes.…”

Section: Introductionmentioning

confidence: 99%

Understory species composition mediates soil greenhouse gas fluxes by affecting bacterial community diversity in boreal forests

Duan

Xiao²,

Cai³

et al. 2023

Front. Microbiol.

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IntroductionPlant species composition in forest ecosystems can alter soil greenhouse gas (GHG) budgets by affecting soil properties and microbial communities. However, little attention has been paid to the forest types characterized by understory vegetation, especially in boreal forests where understory species contribute significantly to carbon and nitrogen cycling.MethodIn the present study, soil GHG fluxes, soil properties and bacterial community, and soil environmental conditions were investigated among three types of larch forest [Rhododendron simsii-Larix gmelinii forest (RL), Ledum palustre-Larix gmelinii forest (LL), and Sphagnum-Bryum-Ledum palustre-Larix gmelinii forest (SLL)] in the typical boreal region of northeast China to explore whether the forest types characterized by different understory species can affect soil GHG fluxes.ResultsThe results showed that differences in understory species significantly affected soil GHG fluxes, properties, and bacterial composition among types of larch forest. Soil CO2 and N2O fluxes were significantly higher in LL (347.12 mg m−2 h−1 and 20.71 μg m−2 h−1) and RL (335.54 mg m−2 h−1 and 20.73 μg m−2 h−1) than that in SLL (295.58 mg m−2 h−1 and 17.65 μg m−2 h−1), while lower soil CH4 uptake (−21.07 μg m−2 h−1) were found in SLL than in RL (−35.21 μg m−2 h−1) and LL (−35.85 μg m−2 h−1). No significant differences between LL and RL were found in soil CO2, CH4, and N2O fluxes. Soil bacterial composition was mainly dominated by Proteobacteria, Actinobacteria, Acidobacteria, and Chloroflexi among the three types of larch forest, while their abundances differed significantly. Soil environmental variables, soil properties, bacterial composition, and their interactions significantly affected the variations in GHG fluxes with understory species. Specifically, structural equation modeling suggested that soil bacterial composition and temperature had direct close links with variations in soil GHG fluxes among types of larch forest. Moreover, soil NO3−−N and NH4+ − N content also affected soil CO2, CH4, and N2O fluxes indirectly, via their effects on soil bacterial composition.DiscussionOur study highlights the importance of understory species in regulating soil GHG fluxes in boreal forests, which furthers our understanding of the role of boreal forests in sustainable development and climate change mitigation.

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The roles of environmental filtering and competitive exclusion in the plant community assembly at Mt. Huangshan are forest-type-dependent

Lv,

Ding,

Wang

et al. 2024

Global Ecology and Conservation

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Topography and Tree Species Improve Estimates of Spatial Variation in Soil Greenhouse Gas Fluxes in a Subtropical Forest

Cited by 4 publications

References 60 publications

Land inclination controls CO₂ and N₂O fluxes, but not CH₄ uptake, in a temperate upland forest soil

Land inclination controls CO₂ and N₂O fluxes, but not CH₄ uptake, in a temperate upland forest soil

Understory species composition mediates soil greenhouse gas fluxes by affecting bacterial community diversity in boreal forests

The roles of environmental filtering and competitive exclusion in the plant community assembly at Mt. Huangshan are forest-type-dependent

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Topography and Tree Species Improve Estimates of Spatial Variation in Soil Greenhouse Gas Fluxes in a Subtropical Forest

Cited by 4 publications

References 60 publications

Land inclination controls CO2 and N2O fluxes, but not CH4 uptake, in a temperate upland forest soil

Land inclination controls CO2 and N2O fluxes, but not CH4 uptake, in a temperate upland forest soil

Understory species composition mediates soil greenhouse gas fluxes by affecting bacterial community diversity in boreal forests

The roles of environmental filtering and competitive exclusion in the plant community assembly at Mt. Huangshan are forest-type-dependent

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Land inclination controls CO₂ and N₂O fluxes, but not CH₄ uptake, in a temperate upland forest soil

Land inclination controls CO₂ and N₂O fluxes, but not CH₄ uptake, in a temperate upland forest soil