[논문]The Response of Nitrogen Deposition to Methane Oxidation Availability and Microbial Enzyme Activities in Forest Soils

Jang, In-Young; Lee, Hyoung-Min; Kang, Ho-Jeong

doi:10.4491/eer.2010.15.3.157

The Response of Nitrogen Deposition to Methane Oxidation Availability and Microbial Enzyme Activities in Forest Soils 원문보기

Environmental engineering research, v.15 no.3, 2010년, pp.157 - 161

Jang, In-Young (School of Civil and Environmental Engineering, Yonsei University) , Lee, Hyoung-Min (Department of Environmental Science and Engineering, Ewha Womans University) , Kang, Ho-Jeong (School of Civil and Environmental Engineering, Yonsei University)

Abstract ▼ AI-Helper

Forest soils are often nitrogen-limited, and nitrogen input to forest soils can cause substantial changes in the structure and functions of a soil ecosystem. To determine the effects of nitrogen input on methane oxidation and the microbial enzyme activities, manipulation experiments were conducted using nitrogen addition to soil samples from Mt. Jumbong. Our findings suggested that the addition of nitrogen to the soil system of Mt. Jumbong did not affect the microbial enzyme activities. Conversely, the addition of nitrogen affected the rate of methane oxidation. Inorganic nitrogen in soils can inhibit methane oxidation via several mechanisms, such as substrate competition, toxic effects, and competition with other microbes, but the inhibitory effects are not always the same. In this research, seasonal changes were found to produce different inhibitory factors, and these different responses may be caused from differences in the methantrophic bacteria community structure.

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제안 방법

In this research, a manipulation experiment was conducted with forest soils to determine the effects of nitrogen input on methane oxidation and the microbial enzyme activities.
The soil is classified as sandy clay loam (sand: 49%, silt: 24%, clay: 27%). Soil samples were collected at 3 different locations with different elevations (Table 1), with 2 replicates collected at each site to a depth of 5 cm from the soil surface, and the samples were sieved (2 mm) in the laboratory and then combined in equal amounts.
The gas samples were analyzed in the laboratory using GC-FID (PORAPAK Q 80/100 column, the detector operated at 150°C, carrier gas: N2).

대상 데이터

Soil samples were collected from Mt. Jumbong (38°02´N, 128°26´E), South Korea.

데이터처리

To determine the effects of the addition of nitrogen and seasonal variations, the methane oxidation rates and activities were analyzed using a two-way ANOVA. Non-parametric correlation was used to determine the relationships between environmental factors and the methane oxidation rates.

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