Estimation of methane emission rates from a rice paddy field using a naturally ventilated tunnel
Estimation of methane emission rates from a rice paddy field using a naturally ventilated tunnel
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使用自然通风隧道估算稻田甲烷排放率
DOI：
10.1111/j.1744-697x.2012.00249.x
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发表时间：
2012
影响因子：
1.3
通讯作者：
et al.
中科院分区：
文献类型：
--
作者：
Futoshi Kato;Naoto Inoue;Shigemitsu Kasuga;et al.
为了量化水田在接近自然条件下的温室气体排放，研制了一种新型水田甲烷排放监测系统。以水稻为研究材料，在稻田上设置1.8 × 10 × 2.5 m的半开放式乙烯基隧道，利用甲烷气体检测仪连续测量隧道内外从孕穗期到成熟期（8 ~ 9月）的甲烷浓度。利用示踪气体法测定的内部和外部甲烷浓度和自然扩散速率之间的差异，每小时计算一次甲烷排放率。结果表明，稻田在两个生育期的甲烷排放量为0.41 ~ 1.32 g m−2day−1。乙烯基隧道对隧道内水稻植株生长和产量无不良影响。尽管该技术在多风条件下存在估算不准确的缺点，但该技术被认为对评估淹水稻田的甲烷排放具有潜在价值。
A novel system for monitoring methane emission from a flooded paddy field was developed in order to quantify the greenhouse gas emission in near‐natural conditions. A paddy field planted with rice was covered by a semi‐open vinyl tunnel (1.8 × 10 × 2.5 m), and the methane concentrations inside and outside the tunnel were measured continuously from the booting stage to the ripening stage (August–September) using a methane gas detector. Methane emission rates were calculated on an hourly basis from the differences between the internal and external methane concentrations and the natural diffusion rates determined using a tracer gas method. The results indicated that the paddy field emitted 0.41–1.32 g methane m−2day−1during the two growth stages. The vinyl tunnel had no adverse effect on the growth and yield of rice plants inside. Despite the disadvantage of non‐accurate estimation under windy conditions, the technique is considered to be of potential value for evaluating methane emissions from a flooded paddy field.