Soil-atmospheric exchange of CO₂, CH₄, and N₂O in three subtropical forest ecosystems in southern China

The magnitude, temporal, and spatial patterns of soil-atmospheric greenhouse gas (hereafter referred to as GHG) exchanges in forests near the Tropic of Cancer are still highly uncertain. To contribute towards an improvement of actual estimates, soil-atmospheric CO₂, CH₄, and N₂O fluxes were measured...

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Veröffentlicht in:Global change biology Jg. 12; H. 3; S. 546 - 560
Hauptverfasser: Tang, Xuli, Liu, Shuguang, Zhou, Guoyi, Zhang, Deqiang, Zhou, Cunyu
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Oxford, UK Oxford, UK : Blackwell Science Ltd 01.03.2006
Blackwell Science Ltd
Blackwell Publishing Ltd
Schlagworte:
biogeochemical cycles
biological activity in soil
Carbon dioxide
Carbon dioxide emissions
Chemical compounds
China
Climate change
Dinghushan Nature Reserve
Dry season
Forest ecosystems
forest soils
forest succession
Forests
gas emissions
gas exchange
GHG fluxes
Greenhouse gases
Litter
Methane
Nitrous oxide
seasonal difference
Seasonal variations
Seasons
soil microorganisms
soil respiration
soil-atmosphere interactions
soil-atmospheric exchange
Soils
subtropics
succession stage
successional forests
China
ISSN:1354-1013, 1365-2486
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Zusammenfassung:The magnitude, temporal, and spatial patterns of soil-atmospheric greenhouse gas (hereafter referred to as GHG) exchanges in forests near the Tropic of Cancer are still highly uncertain. To contribute towards an improvement of actual estimates, soil-atmospheric CO₂, CH₄, and N₂O fluxes were measured in three successional subtropical forests at the Dinghushan Nature Reserve (hereafter referred to as DNR) in southern China. Soils in DNR forests behaved as N₂O sources and CH₄ sinks. Annual mean CO₂, N₂O, and CH₄ fluxes (mean±SD) were 7.7±4.6 Mg CO₂-C ha[superscript [-]1] yr[superscript [-]1], 3.2±1.2 kg N₂O-N ha[superscript [-]1] yr[superscript [-]1], and 3.4±0.9 kg CH₄-C ha[superscript [-]1] yr[superscript [-]1], respectively. The climate was warm and wet from April through September 2003 (the hot-humid season) and became cool and dry from October 2003 through March 2004 (the cool-dry season). The seasonality of soil CO₂ emission coincided with the seasonal climate pattern, with high CO₂ emission rates in the hot-humid season and low rates in the cool-dry season. In contrast, seasonal patterns of CH₄ and N₂O fluxes were not clear, although higher CH₄ uptake rates were often observed in the cool-dry season and higher N₂O emission rates were often observed in the hot-humid season. GHG fluxes measured at these three sites showed a clear increasing trend with the progressive succession. If this trend is representative at the regional scale, CO₂ and N₂O emissions and CH₄ uptake in southern China may increase in the future in light of the projected change in forest age structure. Removal of surface litter reduced soil CO₂ effluxes by 17-44% in the three forests but had no significant effect on CH₄ absorption and N₂O emission rates. This suggests that microbial CH₄ uptake and N₂O production was mainly related to the mineral soil rather than in the surface litter layer.
Bibliographie:http://dx.doi.org/10.1111/j.1365-2486.2006.01109.x
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ArticleID:GCB1109
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ISSN:1354-1013
1365-2486
DOI:10.1111/j.1365-2486.2006.01109.x