Soil methane uptake by grasslands and forests in China

Wang, Yanfen; Chen, Huai; Zhu, Qiuan; Peng, Changhui; Wu, Ning; Yang, Guanying; Zhu, Dan; Tian, Jianqing; Tian, Linlin; Kang, Xiaoming; He, Yixin; Gao, Yongheng; Zhao, Xinquan

doi:10.1016/j.soilbio.2014.02.023

Cited by 77 publications

(50 citation statements)

References 92 publications

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“…In addition, mean annual CH 4 fluxes from fertilized and unfertilized grasslands in Alaska, Colorado and Puerto Rico ranged from −41.4 to −2.9 μg C m −2 hr −1 (Mosier et al 1997), higher than that measured in the present study. Soil CH 4 emission measured in China was also higher than in our study (Wang et al 2014). These results suggest seminatural M. sinensis grasslands in Aso have a higher capacity for atmospheric CH 4 absorption.…”

Section: Annual Soil Methane and Nitrous Oxide Emissionscontrasting

confidence: 45%

Evaluation of greenhouse gas emissions in aMiscanthus sinensisAndersson-dominated semi-natural grassland in Kumamoto, Japan

Toma

Yamada

Fernández

et al. 2015

Soil Science and Plant Nutrition

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Increasing greenhouse gas emissions from anthropogenic activities continue to be a mounting problem worldwide. In the semi-natural Miscanthus sinensis Andersson; grasslands of Aso, Kumamoto, Japan, which have been managed for thousands of years, we measured soil methane (CH 4 ) and nitrous oxide (N 2 O) emissions before and after annual controlled burns. We estimated annual soil carbon (C) accumulation, and CH 4 and N 2 O emissions induced by biomass burning in 2009 and 2010, to determine the impacts of this ecosystem and its management on global warming. Environmental factors affecting soil CH 4 and N 2 O fluxes were unknown, with no effect of annual burning observed on short-term soil ) were relatively lower than those measured in other land-use types. Despite significant emission of CH 4 and N 2 O during yearly burning events in early spring, the M. sinensis semi-natural grassland had a large annual soil C accumulation, which resulted in a global warming potential of −4.86 Mg CO 2 eq ha −1 yr −1. Consequently, our results indicate that long-term maintenance of semi-natural M. sinensis grasslands by annual burning can contribute to the mitigation of global warming. ARTICLE HISTORY

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Section: Annual Soil Methane and Nitrous Oxide Emissionscontrasting

confidence: 45%

Evaluation of greenhouse gas emissions in aMiscanthus sinensisAndersson-dominated semi-natural grassland in Kumamoto, Japan

Toma

Yamada

Fernández

et al. 2015

Soil Science and Plant Nutrition

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“…For China, one of the largest and most populated countries, great achievements have been made in CH 4 flux observations since the 1990s, especially during two national campaigns initiated by the Chinese Academy of Sciences. In situ measurements, primarily carried out using the static chamber‐gas chromatography method [e.g., Wang and Wang , ; Wang et al, ; Wei et al , ], have covered most types of China's natural ecosystems [ Chen et al, ; Wang et al, ]. There is also a growing number of EC studies in natural wetlands, e.g., in NE China [ Sun et al, ] and over the Tibetan Plateau (TP) [ Song et al, ], the major contributors of China's natural wetlands—the two regions contributed 84% of the national natural wetlands in the 2000s [ Niu et al, ].…”

Section: Introductionmentioning

confidence: 99%

“…However, a huge range has been reported for the magnitude of wetland CH 4 emissions, i.e., 1.30 to 5.71 Tg CH 4 yr −1 [ Wang et al, ; Ding et al, ; Cai , ; Chen et al , ; Zhang and Jiang , ]. For CH 4 uptake, Cai [] estimated that grasslands and forests take up −1.73 and −0.60 Tg CH 4 yr −1 , respectively, while Wang et al 's [] estimates of −0.65 and −0.68 Tg CH 4 yr −1 , respectively, were much less, also indicating significant uncertainty.…”

Section: Introductionmentioning

confidence: 99%

CH₄ exchanges of the natural ecosystems in China during the past three decades: The role of wetland extent and its dynamics

Wei

2016

JGR Biogeosciences

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CH4 is the second largest contributor to human‐induced global warming. However, large uncertainties still exist regarding the magnitude and temporal variation of CH4 exchanges in China's natural ecosystems, especially under climate changes. In this study, we assessed its uncertainty and temporal variation during 1979–2012, by integrating a biogeochemical model, extensive in situ measurements, and various sources of wetland maps. Uncertainty analyses suggested that previous studies might have underestimated CH4 emissions, primarily due to bias in wetland extents in NE China. After that, 1 km resolution wetland maps were used to drive the model, together with a 0.1° resolution climate data set. The model showed that China's natural wetlands emitted 4.56 ± 1.24 Tg CH4 yr−1 during the 1980s, which decreased to 3.86 ± 1.09 Tg CH4 yr−1 in the 2000s, mainly due to wetland drainage in NE China. However, recent glacier‐melt‐induced wetland expansion has enhanced CH4 emissions by 28% on the Tibetan Plateau since the 1980s. The magnitude of CH4 uptake by the natural ecosystems has remained relatively stable, e.g., −2.57 ± 0.18 and −2.70 ± 0.19 Tg CH4 yr−1 in the 1980s and 2000s, respectively. In summary, the net CH4 balance of China's natural ecosystems has shown a decreasing pattern, i.e., 1.99 ± 1.42 and 1.16 ± 1.28 Tg CH4 yr−1 in the 1980s and 2000s, respectively, despite distinct regional differences between NE China and the Tibetan Plateau. Furthermore, this study emphasizes the correct representation of wetland extent and its dynamics, i.e., wetland drainage in populated regions and wetland expansion in glacier‐fed regions, in driving the decadal CH4 exchange magnitude.

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“…Although well‐drained forest soils are commonly considered net CH 4 sinks (Dutaur & Verchot, ), we detected periods of net CH 4 emissions in the hillslope soils (Figures and and Table ). During periods of net CH 4 uptake, rates were rather small (15 μg C·m −2 ·hr −1 on average; Figures and ) compared to those commonly reported for subtropical‐tropical forests (Fang et al, ; Tang et al, ; Werner et al, ) or the nationwide average CH 4 uptake by soils in China (Wang et al, ). One possible explanation is that in the aerobic soils on the hillslope (Figure ), CH 4 oxidation is compensated by CH 4 production at the same time, especially during monsoonal summers.…”

Section: Discussionmentioning

confidence: 71%

Humid Subtropical Forests Constitute a Net Methane Source: A Catchment‐Scale Study

Zhu

Zhang

et al. 2019

JGR Biogeosciences

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Commonly, well‐drained forest soils are net methane (CH4) sinks, whereas poorly drained soils in groundwater discharge zones could contribute significant CH4 emissions. Climate change is projected to bring more summer precipitation extremes to subtropics, which may affect forest CH4 balance. Chinese forests often have a hilly topography with well‐drained hillslopes and pronounced groundwater discharge zones. Although different landscape elements are likely to have different source and sink functions for CH4, the climatic influence on CH4 budget at the catchment scale remains poorly studied. Here, we measured CH4 fluxes over three years along a topographic gradient in a subtropical forested catchment in SW China. CH4 fluxes exhibited a clear spatial pattern indicating moderate CH4 uptake or emission from the well‐drained soils on the hillslope (−5.8 to +1.0 kg CH4‐C·ha−1·year−1) and significant CH4 emission from the wetter soils in the groundwater discharge zone (94.3 to 479.5 kg CH4‐C·ha−1·year−1). Despite its small area contribution to the catchment (0.6%), the groundwater discharge zone emitted substantial amounts of CH4 in monsoonal summers, affecting the whole‐catchment budget. Hillslope soils showed weaker CH4 uptake or even turned into a small CH4 source under wet climatic conditions. Estimates of catchment‐scale CH4 budgets indicate that subtropical forest catchments can tip from a net CH4 sink in drier years to a net CH4 source in wetter years, highlighting the importance of interannual climate variabilities. Our findings suggest that subtropical forests under projected climate change could contribute a net CH4 source with consequences for the regional CH4 balance.

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Soil methane uptake by grasslands and forests in China

Cited by 77 publications

References 92 publications

Evaluation of greenhouse gas emissions in aMiscanthus sinensisAndersson-dominated semi-natural grassland in Kumamoto, Japan

Evaluation of greenhouse gas emissions in aMiscanthus sinensisAndersson-dominated semi-natural grassland in Kumamoto, Japan

CH₄ exchanges of the natural ecosystems in China during the past three decades: The role of wetland extent and its dynamics

Humid Subtropical Forests Constitute a Net Methane Source: A Catchment‐Scale Study

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Soil methane uptake by grasslands and forests in China

Cited by 77 publications

References 92 publications

Evaluation of greenhouse gas emissions in aMiscanthus sinensisAndersson-dominated semi-natural grassland in Kumamoto, Japan

Evaluation of greenhouse gas emissions in aMiscanthus sinensisAndersson-dominated semi-natural grassland in Kumamoto, Japan

CH4 exchanges of the natural ecosystems in China during the past three decades: The role of wetland extent and its dynamics

Humid Subtropical Forests Constitute a Net Methane Source: A Catchment‐Scale Study

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CH₄ exchanges of the natural ecosystems in China during the past three decades: The role of wetland extent and its dynamics