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Nitric Oxide Emission Following Wetting of Dry Soils in Subtropical Humid Forests

Pedosphere 2009年第6期19卷 692-699页

作者： LI De-Jun and WANG Xin-Ming 2 State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640 (China) State Key Laboratory of Organic Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 (China)

Information about soil nitric oxide （no. emissions from subtropical forests is quite limited, and even less is kno.n about the pulse emission of no.when wetting soils after a long period of dryness. In this study, we measured no.flux.s following wetting of dry soft in a broadleaf forest and a pine forest in subtropical China. Large pulses of no.flux.s were observed after soil wetting in both forests. no.flux.s increased significantly within 0.5 h following wetting in both forests and reached peak 1 and 4 h after soil wetting in the pine forest and the broadleaf forest, respectively. In the broadleaf forest, averaged peak flux.of no.pulses was 157 ng N m^-2 s^-1, which was 8 times the flux.value before wetting, and in the pine forest, the averaged peak flux.was 135 ng N m-2 s 1, which was 15.5 times the flux.value before wetting. The total pulses-induced no.emissions during the dry season were roughly estimated to be 29.4 mg N m^-2 in the broadleaf forest and 22.2 mg N m^-2 in the pine forest or made up a proportion of 4.6% of the annual no.emission in the broadleaf forest and 5.3% in the pine forest.

关键词： dry season flux. no. pulse subtropical China

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