NDLI: Soil–atmosphere exchange of N$_{2}$O, CO$_{2}$ and CH$_{4}$ along a slope of an evergreen broad-leaved forest in southern China

Content Provider	SpringerLink
Author	Fang, Yunting Gundersen, Per Zhang, Wei Zhou, Guoyi Christiansen, Jesper Riis Mo, Jiangming Dong, Shaofeng Zhang, Tao
Copyright Year	2008
Abstract	At most sites the magnitude of soil-atmosphere exchange of nitrous dioxide (N$_{2}$O), carbon dioxide (CO$_{2}$) and methane (CH$_{4}$) was estimated based on a few chambers located in a limited area. Topography has been demonstrated to influence the production and consumption of these gases in temperate ecosystems, but this aspect has often been ignored in tropical areas. In this study, we investigated spatial variability of the net fluxes of these gases along a 100 m long slope of a evergreen broadleaved forest in southern China over a whole year. We expected that the lower part of slope would release more N$_{2}$O and CO$_{2}$, but take up less atmospheric CH$_{4}$ than the upper part due to different availability of water and nutrients. Our results showed that the soil moisture (Water Filled Pore Space, WFPS) decreased along the slope from bottom to top as we expected, but among the three gases only N$_{2}$O emissions followed this pattern. Annual means of WFPS ranged from 27.7% to 52.7% within the slope, and annual emissions of N$_{2}$O ranged from 2.0 to 4.4 kg N ha$^{−1}$ year$^{−1}$, respectively. These two variables were highly and positively correlated across the slope. Neither potential rates of net N mineralization and nitrification, nor N$_{2}$O emissions in the laboratory incubated soils varied with slope positions. Soil CO$_{2}$ release and CH$_{4}$ uptake appeared to be independent on slope position in this study. Our results suggested that soil water content and associated N$_{2}$O emissions are likely to be influenced by topography even in a short slope, which may need to be taken into account in field measurements and modelling.
Starting Page	37
Ending Page	48
Page Count	12
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	319
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-12-11
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Nitrous oxide Carbon dioxide Methane Soil water content Slope Subtropical forest Ecology Plant Physiology Soil Science & Conservation Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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