淡水湿地不同围垦土壤非耕季节呼吸速率差异
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国家自然基金面上项目"不同围垦利用对淡水湖泊湿地土壤呼吸的影响及机理研究"(41071337);安徽省教育厅自然科学项目"皖江湿地土壤呼吸二氧化碳排放通量研究"(KJ2013B170);池州学院资源环境与可持续发展研究中心项目"湿地土壤碳呼吸CO2排放通量研究"(XKY201109)


Difference of Soil Respiration Rate in Freshwater Wetland with Different Reclamation Methods During Non-cropping Season
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    摘要:

    选择何种湿地利用方式,使得土壤固碳能力及CO2气体排放受到的影响最小,是合理利用湿地、减少温室气体排放的关键所在,湿地土壤呼吸不仅受环境条件的影响,还受土壤本身性状的影响。以皖江地区为研究区域,利用定位试验对天然湿地及不同围垦利用方式下土壤在非耕季节CO2排放通量、大气温度及表层土壤温度进行测定,并对其土壤TOC含量进行分析。结果表明,CO2排放通量:水稻田[700.70 mg/(m2·h)]> 旱地[433.80 mg/(m2·h)]> 天然湿地[302.66 mg/(m2·h)],天然湿地土壤TOC含量明显高于围垦旱地及水稻田(0-30 cm),说明天然湿地较围垦旱地和水稻田对大气中CO2浓度贡献最小,能存储更多的碳。探讨了CO2排放通量与温度的相关性,得出3种土壤类型CO2排放通量与大气温度和表层土壤温度均呈正相关关系。

    Abstract:

    Choice of wetland use pattern to minimize the impacts on soil carbon fixation and CO2 gas emission is the key for reasonable utilization of wetland and reduction of greenhouse gas emission. Wetland soil respiration is affected not only by environmental conditions, but also by soil traits. By a positioned experiment in Wanjing region, CO2 emission flux, air temperature, surface soil temperature of soils in natural wetland and different reclaimed lands during the non-cropping season were measured and their soil TOC contents were analyzed. The land use types, in order of decreasing CO2 emission flux, were paddy field[700.70 mg/(m2·h)], dry land[433.80 mg/(m2·h)] and natural wetland[302.66 mg/(m2·h)]. The soil TOC content of natural wetland was significantly higher than that of reclaimed dry land and paddy field (0-30 cm depth), indicating that the contribution of natural wetland to atmospheric CO2 concentration was the lowest. Therefore, compared to dry land and paddy land, wetland is capable of storing more carbon. The correlation between CO2 emission flux and temperature was also discussed. It follows from the discussion that CO2 emission flux of the three land types is positively correlated with both of atmospheric temperature and surface soil temperature.

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何小青,许信旺,方宇媛,毛敏,石小磊,郑聚锋.淡水湿地不同围垦土壤非耕季节呼吸速率差异[J].水土保持通报,2014,(1):118-122

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  • 收稿日期:2013-04-12
  • 最后修改日期:2013-05-10
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  • 在线发布日期: 2016-03-29
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