CO 2 efflux from different forest soils and impact factors in Dinghu Mountain, China
CO 2 efflux from different forest soils and impact factors in Dinghu Mountain, China
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DOI：
10.1360/05zd0020
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发表时间：
2005-06
影响因子：
5.7
通讯作者：
Zhou Cun-yu;Zhou Guoyi;Zhang Deqiang;Wan Yinghong;Liu Shizhong
中科院分区：
文献类型：
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作者：
Zhou Cun-yu;Zhou Guoyi;Zhang Deqiang;Wan Yinghong;Liu Shizhong
采用静态气相色谱法对鼎湖山3个森林生态系统土壤co2通量及其相关环境因子进行了为期1年的测定。研究了不同类型森林co2通量的季节分布、凋落物对co2总通量的贡献以及co2通量与土壤温度和土壤含水量的相关性。结果表明：(1)3种森林土壤co2通量的季节分布相似，雨季co2通量高于旱季；3个样地年平均co2通量的比较关系表示为：季风林>混交林>松林。(2)季风林、混交林和松林凋落物分解co2通量分别占森林地表co2总通量的24.43%、41.75%和29.23%。(3) 3种类型森林的co2通量与5 cm深度土壤温度之间存在显著的相关关系，可以用指数方程来描述。基于5 cm深度土壤温度计算的q10值在1.86 ~ 3.24之间。土壤水分年变化系数越大，co2通量与土壤含水量的关系越显著。
CO 2 fluxes from soils and related environmental factors were measured in three forest ecosystems of Dinghu Mountain using static chamber-gas chromatograph technique for one year. The seasonal pattern of CO 2 flux, contribution of litter on total CO 2 flux and the correlations of CO 2 flux with soil temperature and soil water content were examined for each type of forest. The results were given as followings: (1) The seasonal patterns of CO 2 flux from soil of the three types of forest were similar, with a higher CO 2 flux in rainy season than in dry season. The comparative relations of mean annual CO 2 fluxes between the three sites were expressed as: monsoon forest > mixed forest > pine forest. (2) CO 2 fluxes from litter decomposition in monsoon forest, mixed forest and pine forest accounted for 24.43%, 41.75% and 29.23% of the corre-sponding total CO 2 fluxes from forest floor, respectively. (3) Significant relationships were found between CO 2 fluxes and soil temperatures at 5 cm depth for the three types of forest, which could be best described by exponential equations. The calculated Q 10 values based on soil tempera-ture at 5 cm depth ranged from 1.86 to 3.24. More significant relationships were found between CO 2 fluxes and soil water content when the annual variation coefficients of soil moisture were higher.