Greenhouse gas fluxes from soils of different land-use types in a hilly area of South China

Liu, Hui; Zhao, Ping; Lü, Ping; Wang, Yuesi; Lin, Yongbiao; Rao, Xingquan

doi:10.1016/j.agee.2007.09.002

Cited by 117 publications

(103 citation statements)

References 22 publications

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“…However, this was in contrast with the finding from a similar study by Tang et al (2006), who only reported a reasonable correlation between soil moisture and N 2 O emissions. In our study, statistical positive relationship between N 2 O emissions and soil moisture were detected in orchard plots, which were in line with the former studies (Tang et al 2006;Liu et al 2008). Nevertheless, the stimulation of soil moisture on N 2 O fluxes may be significant at dry soils and wet soils (Lin et al 2012).…”

Section: Dependence Of Soil Ch 4 and N 2 O On Soil Propertiessupporting

confidence: 92%

“…N 2 O fluxes displayed pronounced dependence on soil properties from the two land use types (Table 5). Soil temperature exhibited distinctive positive correlation with N 2 O fluxes in orchard fields (Table 5), which was in well agreement with the results from other studies (Liu et al 2008;Lin et al 2010). For paddy soils, soil temperature was not a sensitive factor to regulate N 2 O fluxes during our observing period.…”

Section: Dependence Of Soil Ch 4 and N 2 O On Soil Propertiessupporting

confidence: 92%

“…The soil CH 4 uptakes and N 2 O fluxes of newly converted orchard corresponded well with previous results (Iqbal et al 2009;Rowlings et al 2013;Zona et al 2013). However, annual CH 4 uptakes of newly converted orchard were significantly lower than those observed by Liu et al (2008) who reported an average annual soil CH 4 uptake of 2.61 kg C ha −1 year −1 in the subtropical region of southern China. This difference can be attributed to the discrepancy in the orchard establishment years (12 years in south China versus 1 year in red soil).…”

Section: Discussioncontrasting

confidence: 64%

“…Thus, long-term continuous measurements over several years are needed to understand the dynamics of GHG fluxes during different stages after land use conversion. Conversely, annual N 2 O emissions (15.94 and 9.48 kg N ha −1 year −1 ) from orchard were significantly higher than those in humid subtropical Australia (Rowlings et al 2013), mid-subtropical China (Lin et al 2012), and south China (Liu et al 2008), although the amounts of applied N fertilizer rate (176 kg N ha −1 year −1 ) fall in the range of the The data are shown as means with standard errors. Different letters in the same row indicate significant differences (P < 0.05) between corresponding treatments above studies (120-210 kg N ha −1 year −1 ).…”

Section: Discussionmentioning

confidence: 92%

“…Soil temperature is widely reported to be positively correlated with CH 4 fluxes in orchard (Liu et al 2008) and upland crops (Iqbal et al 2009). In our study, such significant positive relationships existed in paddy plots, suggesting that soil temperature was one of the main driving forces of soil CH 4 emissions.…”

Section: Dependence Of Soil Ch 4 and N 2 O On Soil Propertiesmentioning

confidence: 99%

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Effects of land use conversion and fertilization on CH4 and N2O fluxes from typical hilly red soil

Liu

et al. 2016

Environ Sci Pollut Res

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Land use conversion and fertilization have been widely reported to be important managements affecting the exchanges of greenhouse gases between soil and atmosphere. For comprehensive assessment of methane (CH 4 ) and nitrous oxide (N 2 O) fluxes from hilly red soil induced by land use conversion and fertilization, a 14-month continuous field measurement was conducted on the newly converted citrus orchard plots with fertilization (OF) and without fertilization (ONF) and the conventional paddy plots with fertilization (PF) and without fertilization (PNF). Our results showed that land use conversion from paddy to orchard reduced the CH 4 fluxes at the expense of increasing the N 2 O fluxes. Furthermore, fertilization significantly decreased the CH 4 fluxes from paddy soils in the second stage after conversion, but it failed to affect the CH 4 fluxes from orchard soils, whereas fertilizer applied to orchard and paddy increased soil N 2 O emissions by 68 and 113.9 %, respectively. Thus, cumulative CH 4 emissions from the OF were 100 % lower, and N 2 O emissions were 421 % higher than those from the PF. Although cumulative N 2 O emissions were stimulated in the newly converted orchard, the strong reduction of CH 4 led to lower global warming potentials (GWPs) as compared to the paddy. Besides, fertilization in orchard increased GWPs but decreased GWPs of paddy soils. In addition, measurement of soil moisture, temperature, dissolved carbon contents (DOCs), and ammonia (NH 4 + -N) and nitrate (NO 3 − -N) contents indicated a significant variation in soil properties and contributed to variations in soil CH 4 and N 2 O fluxes. Results of this study suggest that land use conversion from paddy to orchard would benefit for reconciling greenhouse gas mitigation and citrus orchard cultivation would be a better agricultural system in the hilly red soils in terms of greenhouse gas emission. Moreover, selected fertilizer rate applied to paddy would lead to lower GWPs of CH 4 and N 2 O. Nevertheless, more field measurements from newly converted orchard are highly needed to gain an insight into national and global accounting of CH 4 and N 2 O emissions.

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Section: Dependence Of Soil Ch 4 and N 2 O On Soil Propertiessupporting

confidence: 92%

Section: Dependence Of Soil Ch 4 and N 2 O On Soil Propertiessupporting

confidence: 92%

Section: Discussioncontrasting

confidence: 64%

Section: Discussionmentioning

confidence: 92%

Section: Dependence Of Soil Ch 4 and N 2 O On Soil Propertiesmentioning

confidence: 99%

See 3 more Smart Citations

Effects of land use conversion and fertilization on CH4 and N2O fluxes from typical hilly red soil

Liu

et al. 2016

Environ Sci Pollut Res

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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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Climate change mitigation and improvement of water quality from the restoration of a subtropical coastal wetland

Iram

Maher

Lovelock

et al. 2022

Ecological Applications

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Coastal wetland restoration is an important activity to achieve greenhouse gas (GHG) reduction targets, improve water quality, and reach the Sustainable Development Goals. However, many uncertainties remain in connection with achieving, measuring, and reporting success from coastal wetland restoration.We measured levels of carbon (C) abatement and nitrogen (N) removal potential of restored coastal wetlands in subtropical Queensland, Australia. The site was originally a supratidal forest composed of Melaleuca spp. that was cleared and drained in the 1990s for sugarcane production. In 2010, tidal inundation was reinstated, and a mosaic of coastal vegetation (saltmarshes, mangroves, and supratidal forests) emerged. We measured soil GHG fluxes (CH 4 , N 2 O, CO 2 ) and sequestration of organic C in the trees and soil to estimate the net C abatement associated with the reference, converted, and restored sites. To assess the influence of restoration on water quality improvement, we measured denitrification and soil N accumulation. We calculated C abatement of 18.5 Mg CO 2Àeq ha À1 year À1 when sugarcane land transitioned to supratidal forests, 11.0 Mg CO 2Àeq ha À1 year À1 when the land transitioned to mangroves, and 6.2 Mg CO 2Àeq ha À1 year À1 when the land transitioned to saltmarshes. The C abatement was due to tree growth, soil accumulation, and reduced N 2 O emissions due to the cessation of fertilization. Carbon abatement was still positive, even accounting for CH 4 emissions, which increased in the wetlands due to flooding and N 2 O production due to enhanced levels of denitrification.Coastal wetland restoration in this subtropical setting effectively reduces CO 2 emissions while providing additional cobenefits, notably water quality improvement.

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Greenhouse gas fluxes from soils of different land-use types in a hilly area of South China

Cited by 117 publications

References 22 publications

Effects of land use conversion and fertilization on CH4 and N2O fluxes from typical hilly red soil

Effects of land use conversion and fertilization on CH4 and N2O fluxes from typical hilly red soil

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

Climate change mitigation and improvement of water quality from the restoration of a subtropical coastal wetland

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Greenhouse gas fluxes from soils of different land-use types in a hilly area of South China

Cited by 117 publications

References 22 publications

Effects of land use conversion and fertilization on CH4 and N2O fluxes from typical hilly red soil

Effects of land use conversion and fertilization on CH4 and N2O fluxes from typical hilly red soil

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

Climate change mitigation and improvement of water quality from the restoration of a subtropical coastal wetland

Contact Info

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