Greenhouse gas budget for terrestrial ecosystems in China

Cai, Zucong

doi:10.1007/s11430-011-4309-8

Cited by 65 publications

(56 citation statements)

References 68 publications

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“…This estimate was about 18%e49% of the total CH 4 uptake by temperate grasslands (Born et al, 1990;Mosier et al, 1991Mosier et al, , 1997. This is lower than a previous study about 1.73 AE 0.64 Tg CH 4 yr À1 partly because more specific data of CH 4 uptake rates were used in this study and partly because we did not included shrublands in our estimate (Cai, 2012). The largest CH 4 uptake of grasslands was found in QPFD, which consumed about 0.284 Tg CH 4 yr…”

Section: Estimated Methane Uptake In Grasslands Of Chinamentioning

confidence: 55%

“…Among the many studies concerning about the CH 4 uptake by grasslands in China, a few focused on estimating the CH 4 budget of grasslands in Inner Mongolia and Qinghai-Tibetan Plateau (Liu et al, 2009a;Wang et al, 2009c;Chen et al, 2010;Kato et al, 2011) with only one estimating the total CH 4 uptake of grasslands and shrublands with low vegetation cover on the country scale, about 1.73 AE 0.64 Tg CH 4 yr À1 (Cai, 2012). Liu et al (2009a,b) estimated that the CH 4 uptake by all upland grassland soils of the Baiyinxile Livestock Farm (covering about 290 661 ha) consumed about 298 AE 56 tons C growing season À1 (MayeSeptember, 153 days).…”

Section: Estimated Methane Uptake In Grasslands Of Chinamentioning

confidence: 99%

“…With the many studies concerning about CH 4 uptake of forests in China, only with great uncertainties (Cai, 2012). With more complete data and detailed calculation, this study estimated the total CH 4 uptake by forests in China as 0.675 Tg CH 4 yr À1 (ranging from 0.399 to 0.946 Tg CH 4 yr À1 ), with 0.513 Tg CH 4 consumed during the growing season and 0.162 Tg CH 4 during the non-growing season (Table 3), which is close to the previous estimate (Cai, 2012) and slightly higher than that of European forests (0.60 Tg yr À1 ) (Dobbie et al, 1996). Due to extensive distribution of forests, CH 4 uptake by forests was found varying among regions with the greatest annual CH 4 uptake about 0.553 Tg CH 4 yr À1 taking place in EHSD, which was accounting for about 82% of the total annual CH 4 uptake of forests in China.…”

Section: Estimated Methane Uptake In Forests Of Chinamentioning

confidence: 99%

“…Several studies have made efforts to estimate the national emission of rice paddies (Cao et al, 1995;Kern et al, 1997;Huang et al, 1998;Khalil et al, 1998;Wang and Li, 2002;Huang et al, 2006;Cai, 2012;Chen et al, 2013), natural wetlands (Ding et al, 2004;Cai, 2012;Chen et al, 2013), and lakes . Based on limited measurement, aerobic soils was estimated to take up atmospheric CH 4 at a rate of 2.56 Tg CH 4 yr À1 (Cai, 2012). So far to the best of our knowledge, there is no synthesis study on a comprehensive CH 4 budget for either grasslands or forests in China, which is indispensable for a general CH 4 uptake estimate for this country.…”

Section: Introductionmentioning

confidence: 99%

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Soil methane uptake by grasslands and forests in China

Wang

Chen

Zhu

et al. 2014

Soil Biology and Biochemistry

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Section: Estimated Methane Uptake In Grasslands Of Chinamentioning

confidence: 55%

Section: Estimated Methane Uptake In Grasslands Of Chinamentioning

confidence: 99%

Section: Estimated Methane Uptake In Forests Of Chinamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Soil methane uptake by grasslands and forests in China

Wang

Chen

Zhu

et al. 2014

Soil Biology and Biochemistry

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“…Since then, CH 4 cycling processes have been intensively studied and documented (Christensen et al, 1996;Hakemian and Rosenzweig, 2007;Lai, 2009;Melloh and Crill, 1996;Mer and Roger, 2001), and most have been described mathematically and incorporated into ecosystem models (Table 1). Herein, we do not attempt to review all CH 4 processes, as a number of reviews have been published on this topic (Barlett and Harriss, 1993;Blodau, 2002;Bridgham et al, 2013;Cai, 2012;Chen et al, 2012;Conrad, 1995Conrad, , 1996Hakemian and Rosenzweig, 2007;Higgins et al, 1981;Lai, 2009;Monechi et al, 2007;Segers, 1998;Wahlen, 1993). Rather, we focus on primary CH 4 processes in terrestrial ecosystems and their environmental controls from a modeling perspective.…”

Section: Primary Ch 4 Processesmentioning

confidence: 99%

Reviews and syntheses: Four decades of modeling methane cycling in terrestrial ecosystems

et al. 2016

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Abstract. Over the past 4 decades, a number of numerical models have been developed to quantify the magnitude, investigate the spatial and temporal variations, and understand the underlying mechanisms and environmental controls of methane (CH 4 ) fluxes within terrestrial ecosystems. These CH 4 models are also used for integrating multi-scale CH 4 data, such as laboratory-based incubation and molecular analysis, field observational experiments, remote sensing, and aircraft-based measurements across a variety of terrestrial ecosystems. Here we summarize 40 terrestrial CH 4 models to characterize their strengths and weaknesses and to suggest a roadmap for future model improvement and application. Our key findings are that (1) the focus of CH 4 models has shifted from theoretical to site-and regional-level applications over the past 4 decades, (2) large discrepancies exist among models in terms of representing CH 4 processes and their environmental controls, and (3) significant datamodel and model-model mismatches are partially attributed to different representations of landscape characterization and inundation dynamics. Three areas for future improvements and applications of terrestrial CH 4 models are that (1) CH 4 models should more explicitly represent the mechanisms underlying land-atmosphere CH 4 exchange, with an emphasis on improving and validating individual CH 4 processes over depth and horizontal space, (2) models should be developed that are capable of simulating CH 4 emissions across highly heterogeneous spatial and temporal scales, particularly hot moments and hotspots, and (3) efforts should be invested to develop model benchmarking frameworks that can easily be used for model improvement, evaluation, and integration with data from molecular to global scales. These improvements in CH 4 models would be beneficial for the Earth system models and further simulation of climate-carbon cycle feedbacks.

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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

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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Greenhouse gas budget for terrestrial ecosystems in China

Cited by 65 publications

References 68 publications

Soil methane uptake by grasslands and forests in China

Soil methane uptake by grasslands and forests in China

Reviews and syntheses: Four decades of modeling methane cycling in terrestrial ecosystems

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

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Greenhouse gas budget for terrestrial ecosystems in China

Cited by 65 publications

References 68 publications

Soil methane uptake by grasslands and forests in China

Soil methane uptake by grasslands and forests in China

Reviews and syntheses: Four decades of modeling methane cycling in terrestrial ecosystems

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

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Product

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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