Publikationsdatum:
2013-01-10
Beschreibung:
[1] The responses of soil methane (CH 4 ) net fluxes to nitrogen (N) addition in a N-fixing tree species ( Acacia auriculiformis ( AA )) and a non-N-fixing tree species ( Eucalyptus citriodora ( EU )) plantation were studied in southern China. Treatments were conducted at each plantation with three N levels (0, 50, and 100 kg N ha −1 yr −1 for control, medium-N, and high-N treatment, respectively, abbreviated as C, MN, and HN). From August 2010 to July 2011, CH 4 flux was measured biweekly using a static chamber and gas chromatography technique. The soils of both sites acted as sink of atmospheric CH 4 . The CH 4 uptake rate in control of the AA site (36.3 ± 3.2 μ g CH 4 -C m −2 h −1 ) was greater than that of the EU plantation (29.9 ± 0.9 μ g CH 4 -C m −2 h −1 ). In the AA plantation, the averaged rates of CH 4 uptake for the MN (28.6 ± 2.3 μ g CH 4 -C m −2 h −1 ) and HN treatment (23.8 ± 2.8 μ g CH 4 -C m −2 h −1 ) were decreased by 21% and 35%, respectively, compared to the control. However, there was no change of soil CH 4 uptake between N-treated plots and the controls in the EU site. Our results indicated that there might be large difference of inhibitive effect of N deposition on soil CH 4 oxidation between the AA and EU plantations. The projected increase of N deposition would weaken the capability of N-fixing tree species plantations for atmospheric CH 4 sink in tropical and subtropical regions.
Print ISSN:
0148-0227
Thema:
Biologie
,
Geologie und Paläontologie
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