乌干达干涸的热带泥炭地异养二氧化碳排放的时间变异性

IF 2.1 Q3 SOIL SCIENCE
J. Farmer, C. Langan, Jo U. Smith
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引用次数: 0

摘要

我们的研究测量了乌干达西南部一个种植马铃薯的排水泥炭地的异养二氧化碳(CO2)排放量。土壤碳损失以前没有报道过这种土地利用,我们的研究旨在捕捉排放的范围和时间变化,并调查与关键环境变量的关系。基于土壤室的排放测量在一年中的四个时间点进行了为期五天的测量,以捕捉每日和每月的变化,包括白天和夜间采样,以捕捉温度和土壤通量的任何日变化。土壤微地形的差异对土壤通量的速率有显著影响。日测结果显示,马铃薯苗圃的温室气体排放和土壤温度在昼夜之间无显著差异。环境驱动因素(如地下水位深度)对土壤通量的影响更为显著,以月为单位,而不是以小时和天为单位。环境变量与土壤通量之间的关系存在显著差异,这取决于土壤最近是否受到干扰。基于微地形的面积加权排放得出该泥炭地利用的年平均排放因子为98.79±1.7 t CO2 ha-1 y-1(±标准误差)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Temporal Variability in Heterotrophic Carbon Dioxide Emissions From A Drained Tropical Peatland in Uganda
Our study measured heterotrophic carbon dioxide (CO2) emissions in a drained peatland under potato cultivation in south-western Uganda. Soil carbon losses have not previously been reported for this land use, and our study set out to capture the range and temporal variation in emissions, as well as investigate relationships with key environmental variables. Soil chamber-based emission measurements were taken over five days at four points in time over the year to capture daily and monthly variability, including day and night sampling to capture any diurnal variations in temperatures and soil flux. Differences in soil microtopography from mounding of soils for potato beds and drainage trenches had a significant effect on the rate of soil flux. Diurnal sampling showed no significant difference in emissions or soil temperatures in the raised potato beds between day and night. More significant effects on soil flux from environmental drivers, such as water table depth, were observed between months, rather than hours and days. There were significant differences in the relationships between environmental variables and soil flux, depending on if soils had been recently disturbed or not. Area-weighted emissions based on microtopography gave a mean annual emissions factor of 98.79 ± 1.7 t CO2 ha-1 y-1 (± standard error) from this peatland use.
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来源期刊
CiteScore
1.90
自引率
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