Different variations in soil CO2, CH4, and N2O fluxes and their responses to edaphic factors along a boreal secondary forest successional trajectory

Duan, Beixing; Cai, Tijiu; Man, Xiuling; Xiao, Ruihan; Gao, Minglei; Ge, Zhaoxin; Mencuccini, Maurizio

doi:10.1016/j.scitotenv.2022.155983

Cited by 16 publications

(6 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The forest soils exhibited net CH 4 uptake with the mean CH 4 fluxes ranging from −35.85 to −21.07 μg m −2 h −1 among three types of larch forest. This result is consistent with previous studies which suggest the larch forest soils show a net sink of atmospheric CH 4 in this study area (Wu et al, 2019;Duan et al, 2022). However, the capacity of soil net CH 4 uptake showed significant differences in RL, LL, and SLL.…”

Section: Effect Of Understory Species On Soil Ch 4 Fluxessupporting

confidence: 93%

“…Meanwhile, understory species can affect soil temperature and moisture by shading and its effect of evapotranspiration (Bond-Lamberty et al, 2011;Myers-Smith et al, 2011). Soil GHG fluxes are highly sensitive to soil temperature and moisture (Chen et al, 2021;Duan et al, 2022;Wang et al, 2022). However, the understory management experiments show that the effects of understory vegetation on soil temperature and moisture differ among understory species (Li et al, 2010;Zhang et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Duan

Xiao²,

Cai³

et al. 2023

Front. Microbiol.

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Effect Of Understory Species On Soil Ch 4 Fluxessupporting

confidence: 93%

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.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Overall, these results supported our second hypothesis. Previous studies have demonstrated inconsistent findings regarding the temporal variation in CH 4 fluxes, such as a unimodal pattern due to temperature rises, a bimodal pattern or no pronounced pattern as the joint effect of multiple factors [52,67]. We found soil CH 4 uptake showed a bimodal pattern during the study period (Figure 1c).…”

Section: Temporal Dependence Of Soil Ghg Fluxes On Soil Microbial Att...mentioning

confidence: 48%

“…+ oxidation [19]. We investigated the temporal variability of soil GHG fluxes and the influencing factors and quantified the soil GHG budgets within a growing season, similar to many other studies [67,69]. Notably, the roles of GHG fluxes during the dormant season are not negligible in their annual budget estimates according to previous evidence [70].…”

Section: Temporal Dependence Of Soil Ghg Fluxes On Soil Microbial Att...mentioning

confidence: 77%

Temporal Variability in Soil Greenhouse Gas Fluxes and Influencing Factors of a Primary Forest on the Eastern Qinghai-Tibetan Plateau

Liu,

Luo,

et al. 2023

Forests

View full text Add to dashboard Cite

Soil greenhouse gas (GHG) fluxes relate to soil carbon and nitrogen budgets and have a significant impact on climate change. Nevertheless, the temporal variation and magnitude of the fluxes of all three major GHGs (CO2, CH4 and N2O) and their influencing factors have not been elucidated clearly in primary forests on the eastern Qinghai-Tibetan Plateau. Herein, field chamber GHG fluxes from May to November, soil microbial community and enzyme activity were analyzed in a fir-dominated (Abies fargesii var. faxoniana) primary forest. The emission rates of CO2 and N2O ranged between 64.69–243.22 mg CO2 m−2 h−1 and 1.69–5.46 ug N2O m−2 h−1, exhibiting a temporally unimodal pattern with a peak in July. The soil acted as a CH4 sink, and the uptake rate varied between 52.96 and 84.67 μg CH4 m−2 h−1 with the higher uptake rates in June and November. The temporal variation in the CO2 flux was significantly correlated with the geometric mean of enzyme activities, suggesting that the soil CO2 flux was determined by microbial activity rather than soil microbial biomass. The soil N2O flux was positively related to nitrate concentration with marginal significance, probably because N2O was a byproduct of nitrification and denitrification processes. The soil CH4 uptake was closely associated with methanotrophic biomass (18:1ω7c). The results highlight divergent temporal dynamics of GHG fluxes owing to different driving mechanisms and an important CH4 sink in the primary forest soil, helping to evaluate the carbon and nitrogen budgets of primary forests on the eastern Qinghai-Tibetan Plateau.

show abstract

“…Thirdly, humidity is also considered to significantly affect GHG emissions over a longer period (e.g., seasonal and annual), and it is usually recorded in the form of rainfall [33,34]. However, the relationship between GHGs and humidity in a diurnal variation is rarely observed, and even if it is, a direct positive correlation has not been found in most cases due to the complex mechanisms of GHG emissions or the uncertainty of monitoring diurnal variations in soil humidity [30].…”

Section: Discussionmentioning

confidence: 99%

Determining Suitable Sampling Times for Soil CO2 and N2O Emissions Helps to Accurately Evaluate the Ability of Rubber-Based Agroforestry Systems to Cope with Climate Stress

Xian,

Li,

Zhang

et al. 2024

Forests

View full text Add to dashboard Cite

Agroforestry is known to significantly improve long-term land productivity, potentially enhancing the ability to cope with climate stress. However, there is limited information regarding the accurate monitoring of greenhouse gases (GHGs) in rubber-based agroforestry systems. Before GHGs can be accurately estimated, the diurnal variations and suitable sampling times must be studied to reduce the uncertainty of the manual static chamber method. In this study, the soil GHGs emitted from conventional single-row (SR) and improved double-row (DR) rubber plantations were compared across the dry and wet seasons in Hainan, China. A total of 1728 GHG samples from a field trial were collected, analyzed, and related to environmental factors. The results demonstrated that the diurnal fluxes of CO2 in rubber plantations were likely to remain fluctuating, with the maximum typically occurring during the night-time and daytime hours of the dry and wet seasons, respectively. A clearer double-peak (around 2:00 and 14:00) during the dry season and a daytime peak (14:00) during the wet season of the N2O were recorded. In addition to the commonalities, different seasons and different types of GHGs and rubber plantations also differed in their detailed fluctuation times and ranges; therefore, the determination of suitable sampling times should not ignore these factors in certain cases. Based on this study, it was determined that the late afternoon (16:00–18:00) was the suitable sampling time of soil GHGs in rubber plantations, instead of the most common morning times (with an underestimation of 25% on average). In addition, the air humidity during the dry season and the soil temperature during the wet season were both positively correlated with GHGs (p < 0.05). This study highlights the significance of accurately monitoring soil GHGs in rubber-based agroforestry systems, providing a basic reference for the development and management of climate-smart land use practices in rubber plantations.

show abstract

Different variations in soil CO2, CH4, and N2O fluxes and their responses to edaphic factors along a boreal secondary forest successional trajectory

Cited by 16 publications

References 60 publications

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

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

Temporal Variability in Soil Greenhouse Gas Fluxes and Influencing Factors of a Primary Forest on the Eastern Qinghai-Tibetan Plateau

Determining Suitable Sampling Times for Soil CO2 and N2O Emissions Helps to Accurately Evaluate the Ability of Rubber-Based Agroforestry Systems to Cope with Climate Stress

Contact Info

Product

Resources

About