Whole-year-round Observation of N2O Profiles in Soil: A Lysimeter Study
Whole-year-round Observation of N2O Profiles in Soil: A Lysimeter Study
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DOI：
10.1007/s11267-007-9165-3
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发表时间：
2008-04
期刊：
影响因子：
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通讯作者：
S. Reth;W. Graf;O. Gefke;R. Schilling;H. Seidlitz;J. Munch
中科院分区：
文献类型：
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作者：
S. Reth;W. Graf;O. Gefke;R. Schilling;H. Seidlitz;J. Munch
尽管有许多研究的N2 O排放，有一个缺乏知识的底土的N2 O排放的作用，特别是在桑迪土壤。为了深入了解N2 O在土壤中的截留、扩散、对流和沸腾过程，利用4个蒸渗仪（1 m2 × 2 m的农业土壤块），在30、50、80、155和190 cm深度处，用86个气体探头，对土壤大气中N2 O浓度进行了为期1年的测定。此外，在20个封闭的室内测定了土壤表面的N2 O排放到大气中。同时记录土壤温度和土壤含水量，以量化其对土壤中N2 O的命运的影响。2006年1月至12月的连续测量结果是：N2 O浓度最高的深层土壤中，最大浓度被发现在80厘米的深度，其中水分含量高，气体输送减少。最高的N2 O浓度记录后的“特殊事件”，如融雪，大雨，施肥，和掘地。施肥和大雨的结合导致底土中的浓度增加了2,700 ppb。
Despite many studies of the N2O emission, there is a lack of knowledge on the role of subsoil for N2O emission, particularly in sandy soils. To obtain insight into the entrapment, diffusion, convection and ebullition of N2O in the soil, the N2O concentration in the soil atmosphere was measured over a period of 1 year in 4 lysimeters (agricultural soil monoliths of 1 m2 × 2 m) at 30, 50, 80, 155, and 190 cm depth with altogether 86 gas probes. Additionally the N2O emission into the atmosphere was measured in 20 closed chambers at the soil surface. Concurrently the soil temperature and soil water content were recorded in order to quantify their effects on the fate of N2O in the soil. Results of the continuous measurements between January and December 2006 were: N2O concentrations were highest in the deeper soil; maximum concentration was found at a depth of 80 cm, where the water content was high and the gas transport reduced. The highest N2O concentration was recorded after ‘special events’ like snowmelt, heavy rain, fertilization, and grubbing. The combination of fertilization and heavy rain led to an increase of up to 2,700 ppb in the subsoil.