Methane consumption and soil respiration by a birch forest soil in West Siberia
Methane consumption and soil respiration by a birch forest soil in West Siberia
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DOI：
10.3402/tellusb.v56i3.16421
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发表时间：
2003-12
期刊：
影响因子：
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通讯作者：
T. Nakano;G. Inoue;M. Fukuda
中科院分区：
文献类型：
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作者：
T. Nakano;G. Inoue;M. Fukuda
甲烷和二氧化碳通量测定在西西伯利亚的桦树林土壤中，在1999年8月，2000年6月和2000年9月。研究地点有一个非常厚的有机层，在观察期间受到干旱。土壤总是吸收CH4，而CO2从地表释放到大气中。甲烷消耗率和二氧化碳排放率分别为0.092至0.28 mg C m−2 h−1和110至400 mg C m−2 h−1。CH4消耗率和土壤温度表现出显着的关系，个人测量。土壤呼吸速率与土壤温度呈弱相关。本研究探讨了当前和滞后的土壤温度在5厘米深的CH4消耗和土壤呼吸的影响。CH4消耗量与滞后土壤温度的相关系数在滞后4 h时变化最大，而土壤呼吸量在滞后数h至半天时出现平缓的峰值。CH4消耗和土壤呼吸之间与温度相关的滞后效应的这种差异是由于交换过程的差异造成的。两种通量都没有表现出与土壤水分的相关性。在我们的观测期间，土壤湿度的有限变化可能是缺乏相关性的原因。然而，干旱的土壤条件导致高气体扩散，因此，高甲烷消耗。
Methane and carbon dioxide fluxes were measured in a birch forest soil in West Siberia, in August 1999, June 2000 and September 2000. The study site had a very thick organic horizon that was subject to drought during the observation periods. The soils always took up CH4, while CO2 was released from the surface to the atmosphere. CH4 consumption and CO2 emission rates ranged from 0.092 to 0.28 mg C m−2 h−1 and from 110 to 400 mg C m−2 h−1 respectively. The CH4 consumption rate and soil temperatures showed significant relationships for individual measurements. The soil respiration rate was weakly correlated with individual soil temperatures. This study examined the effect of current and lagged soil temperatures at a depth of 5 cm on CH4 consumption and soil respiration. The variation in the correlation coefficient between CH4 consumption and lagged soil temperature was greatest at a 4-h lag, whereas that for soil respiration showed a gentle peak at lags from several hours to half a day. This difference in the temperature-related lag effect between CH4 consumption and soil respiration results from differences in the exchange processes. Neither flux showed any correlation with soil moisture. The limited variation in soil moisture during our observation period may account for the lack of correlation. However, the droughty soil conditions resulted in high gas diffusion and, consequently, high CH4 consumption.