Effects of soil warming, rainfall reduction and water table level on CH 4 emissions from the Zoige peatland in China

Yang, Guanying; Chen, Huai; Wu, Ning; Tian, Jianqing; Peng, Changhui; Zhu, Qiuan; Zhu, Dan; He, Yixin; Zheng, Qunying; Zhang, Changbing

doi:10.1016/j.soilbio.2014.07.013

Cited by 111 publications

(82 citation statements)

References 56 publications

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“…In most cases, methanogenic archaea can only be detected in high water-table level soils, such as those that are either frequently or permanently flooded (Høj et al 2006;Kemnitz et al 2004). This hypothesis was further supported by our result that methane emissions were reduced by water-table drawdown, being 5.5 times higher at the soil surface (0-cm water-table level ) (Yang et al 2014). The methane emissions were positively related to archaeal abundance (R 2 =0.38, p=0.03).…”

Section: Discussionsupporting

confidence: 75%

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Response of archaeal communities to water regimes under simulated warming and drought conditions in Tibetan Plateau wetlands

et al. 2014

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Purpose Understanding how archaeal communities are affected by water-table drawdown is essential for predicting soil functional responses to future climate change and the consequences of the responses on the soil carbon cycle. Material and methods We investigated the effect of watertable drawdown, warming, drought, and combinations thereof on archaeal communities using terminal restriction fragment length polymorphism (T-RFLP) and quantitative PCR.Results and discussion Methanosarcinales, Methanosaeta, Methanomicrobiales, Methanobacteriales, uncultured Rice Cluster II (RC-II), and uncultured Crenarchaeota were detected. Water-table drawdown and drought exhibited significant effects on the archaeal communities. When the water table was at or above 10 cm, the archaeal abundance at 10 cm remained high (approximately 10 9 cells per gram dry soil), whereas the archaeal abundance at 10 cm was reduced to approximately 10 8 cells per gram dry soil where the water table was lowered to 20 cm or below. When the water table kept constant, warming caused a significant reduction in the archaeal abundance, whereas drought only caused a decrease in archaeal abundance when the water table was higher than −20 cm. Conclusions Results suggest that changes in water table may directly impact archaeal community abundance and assemblage which can in turn influence methane emissions, potentially on a large scale. Our results also indicate that archaeal communities response to water-table drawdowns that are dependent on the initial ecohydrology.

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Section: Discussionsupporting

confidence: 75%

“…The core was then removed and immediately placed in polyvinyl chloride (PVC) containers (25-cm diameter and 50-cm height) with as little disturbance to the soil as possible. The more detailed information of experimental design was reported by Yang et al (2014).…”

Section: Experimental Designmentioning

confidence: 99%

Response of archaeal communities to water regimes under simulated warming and drought conditions in Tibetan Plateau wetlands

et al. 2014

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Section: Discussionsupporting

confidence: 92%

“…In line with our findings, two studies regarding the primary swamps from the Sanjiang plain in China showed that water level was negatively correlated to CO 2 emissions but positively correlated to CH 4 emissions [40,41]. As the water level rose from −50 cm to 0 cm, CH 4 emissions increased significantly [42], a finding that is consistent with the field results of the present study. Furthermore, observations at 11 different water levels also showed that, on a regional scale, water level was negatively correlated to CO 2 emissions and positively correlated to CH 4 emissions, as was also observed by Chen and co-workers in their landscape-scale study of the Zoige peatlands, in which they found that CH 4 flux greatly correlated to the standing water depth [10].…”

Section: Discussionsupporting

confidence: 92%

Rewetting Decreases Carbon Emissions from the Zoige Alpine Peatland on the Tibetan Plateau

Kang

Hao

et al. 2017

Sustainability

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Abstract:Peatlands play an important role in the global carbon cycle and potentially have a significant impact on regional climate change. Restoring and rewetting the degraded peatlands is an urgent task. However, effects of rewetting on the carbon emissions of peatlands remain poorly understood. In this study, the process of rewetting a piece of the degraded Zoige alpine peatland was experimentally simulated and the derived results were compared with those of natural rewetting by monitoring CO 2 and CH 4 fluxes and other environmental factors before and after rewetting. The natural rewetting results showed that rewetting decreased ecosystem respiration (ER) by about 60%. Furthermore, rewetting increased CH 4 emissions by 127%, decreased total carbon emissions (TCE) from 270 to 157 mg CO 2 m −2 h −1 , and decreased TCE from the entire ecosystem by 42%. The results of the controlled experiment showed that ER decreased gradually as the degree of rewetting was increased, and CH 4 fluxes and changes in water level were significantly and positively correlated: CH 4 fluxes increased from 0.3 (water level −20 cm) to 2.17 mg CH 4 m −2 h −1 (water level 20 cm). After rewetting, the TCE of the whole ecosystem were significantly decreased. Regional observations showed that CO 2 fluxes were significantly and negatively correlated to the water level; and the corresponding CO 2 equivalent was significantly and positively correlated to the water level, while TCE were significantly and negatively correlated to the water level. Our findings indicate that rewetting can decrease carbon emissions and thus contribute in mitigating the adverse effects of climate change in alpine peatland.

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“…Water table drawdown may destroy the stable environment in peatlands, exposing the preserved carbon to aerobic (AE) environment (Oechel et al, 1998), and together with the optimum soil moisture creating an available environment for microbes (Serreze et al, 2000;Yan et al, 2014;Zimov et al, 2006). Water table drawdown also shifts soil respiration (Rs) pathway from anaerobic (AN) to aerobic environment, which responds to climate change differently (Knoblauch et al, 2013;Lee et al, 2012;Schuur et al, 2008;Treat et al, 2014;Yang et al, 2014). Studies showed that the stored old carbon in deep soil of degraded peatlands had participated in modern carbon cycle (McCallister and Del Giorgio, 2012;Schuur et al, 2009;Singer et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Responses of peat carbon at different depths to simulated warming and oxidizing

Liu

Chen

Zhu

et al. 2016

Science of The Total Environment

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Effects of soil warming, rainfall reduction and water table level on CH 4 emissions from the Zoige peatland in China

Cited by 111 publications

References 56 publications

Response of archaeal communities to water regimes under simulated warming and drought conditions in Tibetan Plateau wetlands

Response of archaeal communities to water regimes under simulated warming and drought conditions in Tibetan Plateau wetlands

Rewetting Decreases Carbon Emissions from the Zoige Alpine Peatland on the Tibetan Plateau

Responses of peat carbon at different depths to simulated warming and oxidizing

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