Asynchronous responses of microbial CAZymes genes and the net CO2 exchange in alpine peatland following 5 years of continuous extreme drought events

Yan, Zhongqing; Kang, Enze; Zhang, Kerou; Hao, Yanbin; Wang, Xiaodong; Li, Yong; Li, Meng; Wu, Haidong; Zhang, Xiaodong; Yan, Lijun; Zhang, Wantong; Li, Jie; Yang, Ankun; Niu, Yuechuan; Kang, Xiaoming

doi:10.1038/s43705-022-00200-w

Cited by 8 publications

(6 citation statements)

References 70 publications

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“…In any case, drought disrupted the peatland's carbon balance, as evidenced by the significant increase in NEE. Similar observations have been made in all other relevant studies (Keane et al, 2021;Sterk et al, 2023;Yan et al, 2022).…”

Section: Impact Of a Severe Drought On A Mountain Peatland Carbon Bal...supporting

confidence: 91%

“…Some suggest that if soil water content drops too low, CO 2 producing bacteria are unable to break down organic matter because they require water for survival (E. Kang et al., 2022). Others propose that microorganisms exhibit stability in the face of drought, making GPP reduction the primary mechanism behind NEE destabilization (Yan et al., 2022). In any case, drought disrupted the peatland's carbon balance, as evidenced by the significant increase in NEE.…”

Section: Discussionmentioning

confidence: 99%

“…Turetsky et al, 2002). Global changes and drought events can potentially alter the carbon balance of peatlands, turning them from carbon sinks to sources (Carter et al, 2012;Keane et al, 2021;Loisel et al, 2021;Page & Baird, 2016;Yan et al, 2022). This hypothesis is still debated due to a lack of comprehensive field observations (Muhr et al, 2011;Wang et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…If undisturbed peatlands have remained carbon sinks over millennia, It has been widely demonstrated that carbon uptake by peatlands is considerably reduced when disturbed (Fenner & Freeman, 2011; M. Turetsky et al., 2002). Global changes and drought events can potentially alter the carbon balance of peatlands, turning them from carbon sinks to sources (Carter et al., 2012; Keane et al., 2021; Loisel et al., 2021; Page & Baird, 2016; Yan et al., 2022). This hypothesis is still debated due to a lack of comprehensive field observations (Muhr et al., 2011; Wang et al., 2015).…”

Section: Introductionmentioning

confidence: 99%

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Mountain Peatlands and Drought: Carbon Cycling in the Pyrenees Amidst Global Climate Change

Garisoain,

Jacotot,

Delire

et al. 2024

JGR Biogeosciences

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This study provides a multi‐year (2017–2022) Net Ecosystem Carbon Balance (NECB) of a Pyrenean mountainous peatland through the integration of field data, satellite imagery, and statistical modeling. Fluvial organic carbon export was measured at 30 min frequency, while gaseous (CO2 and CH4) exchanges were measured monthly using closed chambers. These measurements were combined with Sentinel‐2 derived chlorophyll index and in situ high frequency (1 hr) measurements of key environmental variables such as air temperature, photosynthetically active radiation, and water table level, to develop hourly gaseous carbon flux models (R2 = 0.69 for GPP, R2 = 0.84 for ER, R2 = 0.59 for CH4). Over the 2017–2022 period, modeled average GPP (610 ± 39 gC.m−2.year−1) and ER (641 ± 59 gC.m−2.year−1) showed that the peatland acted as a weak source of CO2 to the atmosphere, releasing 31 ± 73 gC.m−2.year−1. Considering fluvial carbon export and CH4 exchanges, the loss of carbon from the peatland increased to 55 ± 73 gC.m−2.year−1. Dissolved organic carbon constituted 8%–106% of the NECB. The estimated long‐term organic accumulation rate indicated a steady carbon accumulation rate of 16.4 gC.m−2.year−1, contrasting with the contemporary NECB, suggesting a recent shift in ecosystem functioning from a carbon sink to a source. The study underscores the role of water availability and air temperature through a drought index (DI), in shaping the NECB. The DI correlated significantly with annual carbon gaseous fluxes, except for 2022, marked by an intense drought. During this year the peatland became a large source of carbon (189 gC.m−2.year−1) to the atmosphere.

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Section: Impact Of a Severe Drought On A Mountain Peatland Carbon Bal...supporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Mountain Peatlands and Drought: Carbon Cycling in the Pyrenees Amidst Global Climate Change

Garisoain,

Jacotot,

Delire

et al. 2024

JGR Biogeosciences

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“…Soil total nitrogen (TN) was determined by the Kjeldahl procedure. These have already been demonstrated in our previous research (Kang et al, 2022;Yan et al, 2022).…”

Section: Measurements Of Soil Propertiessupporting

confidence: 83%

Effects of extreme drought on soil microbial functional genes involved in carbon and nitrogen cycling in alpine peatland

Yan,

Li,

Hao

et al. 2023

Front. Ecol. Evol.

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Diverse microorganisms drive biogeochemical cycles and consequently influence ecosystem-level processes in alpine peatlands, which are vulnerable to extreme drought induced by climate change. However, there are few reports about the effects of extreme drought on microbial function. Here we identify microbial functional genes associated with carbon and nitrogen metabolisms of extreme drought experiments that occurred at different periods of plant growth, the results show that early extreme drought reduces the abundance of functional genes involved in the decomposition of starch and cellulose; midterm extreme drought increases the abundance of lignin decomposition functional genes; late extreme drought reduces the hemicellulose but increases cellulose decomposition functional genes. In the carbon fixation pathway, extreme drought mainly changes the abundance of functional genes involved in the reductive citrate cycle process, the 3-hydroxy propionate bi-cycle, the dicarboxylate-hydroxybutyrate cycle and the incomplete reductive citrate cycle. Among the nitrogen cycling functional genes, amoA involved in oxidizing ammonia to hydroxylamine significantly increases under early extreme drought; midterm extreme drought reduces nrtC and nifD genes, which participate in nitrate assimilation and nitrogen fixation, respectively; late extreme drought significantly increases hcp genes involved in ammonification. pH and TN had the largest effects on the carbon degradation, fixation and nitrogen cycling functional genes. The composition of microbial community structures involved in carbon fixation differed between treatments in early extreme drought. There is a good linear fit between the diversity of gene abundance and corresponding microbial communities in the reductive citrate cycle, hydroxy propionate-hydroxybutyrate cycle, dicarboxylate-hydroxybutyrate cycle and nitrogen cycling, which suggests that the functional genes and community composition of microorganisms involved in these processes are consistent in response to extreme drought. This study provides new insights into the adaptability and response characteristics of microbial communities and functional genes in plateau peatland ecosystems to extreme drought events.

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Difference in soil microbial necromass carbon accumulation induced by three crops straw mulching for 4 years in a citrus orchard

Liang,

Chen,

Wang

et al. 2024

Biol Fertil Soils

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Asynchronous responses of microbial CAZymes genes and the net CO2 exchange in alpine peatland following 5 years of continuous extreme drought events

Cited by 8 publications

References 70 publications

Mountain Peatlands and Drought: Carbon Cycling in the Pyrenees Amidst Global Climate Change

Mountain Peatlands and Drought: Carbon Cycling in the Pyrenees Amidst Global Climate Change

Effects of extreme drought on soil microbial functional genes involved in carbon and nitrogen cycling in alpine peatland

Difference in soil microbial necromass carbon accumulation induced by three crops straw mulching for 4 years in a citrus orchard

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