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首页> 外文期刊>Soil Biology & Biochemistry >Effects of experimental drying intensity and duration on respiration and methane production recovery in fen peat incubations.
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Effects of experimental drying intensity and duration on respiration and methane production recovery in fen peat incubations.

机译：实验干燥强度和持续时间对粉煤灰培养物呼吸和甲烷产量恢复的影响。

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摘要

Drying and rewetting to a variable extent influence the C gas exchange between peat soils and the atmosphere. We incubated a decomposed and compacted fen peat and investigated in two experiments (1) the vertical distribution of CO2 and CH4 production rates and their response to drying and (2) the effects of temperature, drying intensity and duration on CO2 production rates and on CH4 production recovery after rewetting. Surface peat down to 5 cm contributed up to 67% (CO2) and above 80% (CH4) of the depth-aggregated (50 cm) production. As CO2 production sharply decreased with depth water table fluctuations in deeper peat layers are thus not expected to cause a substantial increase in soil respiration in this site. Compared to anaerobic water saturated conditions drying increased peat CO2 production by a factor between 1.4 and 2.1. Regarding the effects of the studied factors, warmer conditions increased and prolonged drying duration decreased CO2 production whereas the soil moisture level had little influence. No significant interactions among factors were found. Short dry events under warmer conditions are likely to result in greatest peaks of CO2 production rates. Upon rewetting, CH4 production was monitored over time and the recovery was standardized to pre-drying levels to compare the treatment effects. Methane production increased non-linearly over time and all factors (temperature, drying intensity and duration) influenced the pattern of post-drying CH4 production. Peat undergoing more intense and longer drying events required a longer lag time before substantial CH4 production occurred and warmer conditions appeared to speed up the process.
机译：干燥和再润湿在不同程度上影响泥炭土壤与大气之间的C气体交换。我们孵育了分解压实的泥炭，并在两个实验中进行了研究（1）CO 2 和CH 4 生产率的垂直分布及其对干燥的响应，（2）温度，干燥强度和持续时间对再润湿后CO 2 生产率和CH 4 产量恢复的影响。低至5厘米的表层泥炭贡献了深度汇总（50厘米）产量的67％（CO 2 ），高于80％（CH 4 ）。由于CO 2 产量随深度地下水位而急剧下降，因此预计在较深泥炭层中的波动不会引起该地区土壤呼吸的大幅增加。与厌氧水饱和条件相比，干燥使泥炭中CO 2 的产生增加了1.4到2.1之间。关于研究因素的影响，温暖的条件增加了，干燥时间的延长降低了CO 2 的产生，而土壤水分水平的影响却很小。没有发现因素之间的显着相互作用。在温暖的条件下短暂的干燥事件很可能导致CO 2 生产率的最大峰值。重新润湿后，随时间监测CH 4 的产生，并将回收率标准化至干燥前的水平以比较处理效果。甲烷产量随时间呈非线性增长，所有因素（温度，干燥强度和持续时间）均影响CH 4 干燥后甲烷的产生方式。泥炭经历更剧烈和更长的干燥过程需要更长的滞后时间，才能大量产生CH 4 并出现较暖的条件以加快该过程。

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