[논문]온대 낙엽 활엽수림에서의 강수량에 따른 메탄 흡수 감소

나다르 후세인 코카르; 박재우

doi:10.7857/jsge.2019.24.1.024

온대 낙엽 활엽수림에서의 강수량에 따른 메탄 흡수 감소
Precipitation Decreases Methane Uptake in a Temperate Deciduous Forest 원문보기

지하수토양환경 = Journal of soil and groundwater environment, v.24 no.1, 2019년, pp.24 - 34

나다르 후세인 코카르 (한양대학교 건설환경공학과) , 박재우 (한양대학교 건설환경공학과)

Abstract ▼ AI-Helper

Soil moisture regulates the fate of methane ($CH_4$) in forest soil via biological and chemical processes. The instant effect of variable precipitation on $CH_4$ uptake is, however, unclear in the forest ecosystems. Here, we measured $CH_4$ flux in a temperate forest soil immediately after variable volume of water applications equivalent to 10, 20 40, and $80mm\;m^{-2}day^{-1}$ precipitation. $CH_4$ uptake was significantly higher when the water was not applied. The $CH_4$ uptake decreased significantly with increasing water application. $CH_4$ uptake was linked with air filled porosity and water filled porosity. $CH_4$ uptake response to actual precipitation intensity was in agreement with $CH_4$ uptake results in this study. $CH_4$ uptake decreased 55% at highest precipitation intensity. Since annual $CH_4$ flux is calculated with interpolation of weekly or biweekly field observations, instant effect of precipitation can mislead the interpolated annual results.

주제어

표/그림 (9)

그림 Fig. 1. On field experimental treatments to determine the effect of variable precipitation on CH₄ uptake.
그림 Fig. 2. (a), CH₄ flux; (b), soil temperature; and (c), soil water content with variable precipitation 0, 10, 20, 40, and 80 mm per day. Error bars represent ±1 standard error of mean. *water was applied on these dates.
그림 Fig. 3. Relationships (a-e, P (0-80) and a-e, NP (0-80)) between CH₄ emission and soil air filled porosity in different soil depths (0-10, 10-20, and 20-30 cm).
그림 Fig. 4. Relationships (a-e, P-(0-80) and NP-(0-80)) between CH₄ emission and soil water filled pore space in different soil depths (0-10, 10-20, and 20-30 cm).
그림 Fig. 5. Average daily precipitation, estimated average daily CH₄ uptake, South Korea.
그림 Fig. 6. Estimated total CH₄ uptake (2017) in this study and its difference (%) with weekly and biweekly sampling frequencies.
그림 Fig. 7. CH₄ uptake at different intensities of precipitation.
그림 Fig. 8. Comparison of CH₄ uptake in this study with reduced CH₄ uptake due to variable precipitation intensity. Error bar represent ±1 standard error of mean.
표 Table 1. Summary of published CH₄ uptake in temperate forests

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문제 정의

Precipitation varies throughout a year and this variation affects soil moisture, which thereby affects CH₄ uptake or emission. The objectives of this study were to investigate the instant effect of variable precipitation on CH₄ uptake and to estimate the contribution of precipitation in reducing net CH₄ uptake in temperate forest. We hypothesized that CH₄ emission will occur when it starts to rain because rain water will replace CH₄ present in subsoil.
Our results can be used as a reference for regions with similar conditions. This study demonstrated the effects of variable precipitation on net daily CH₄ uptake and it may help in calculating more accurate net annual CH₄ sink in temperate forests in the world.

가설 설정

CH₄ uptake decreased significantly due to increasing water application in P-(10-80). We also hypothesized that CH₄ uptake will decrease with increasing WFPS, in P-80 WFPS was 53% higher than P-0 CH₄ uptake decreased 85.6% in P-80. This decrease in CH₄ uptake was positively correlated with air filled porosity and negatively correlated with water filled pore space.
The objectives of this study were to investigate the instant effect of variable precipitation on CH₄ uptake and to estimate the contribution of precipitation in reducing net CH₄ uptake in temperate forest. We hypothesized that CH₄ emission will occur when it starts to rain because rain water will replace CH₄ present in subsoil. CH₄ uptake may decrease after precipitation due to water-filled pore space and in result limited space for atmospheric CH₄ uptake.

제안 방법

CH₄ uptake at variable intensity of precipitation was calculated by interapolation of CH₄ uptake results in this study (Fig. 7). Maximal total precipitation in 2017 was 372.
All gas samples were stored in 25 mL glass vials sealed with aluminum caps and gray butyl septa. Samplings were conducted between 09:00 to 10:00 between 14^th September to 15^th October in 2018 every third day. Gas samples were analyzed using a gas chromatograph (YL 6100, Young Lin Instrument Co.
sampling. Soil temperature and water content were monitored at 10, 20, and 30 cm depth of one plot on each sampling day. Soil samples were collected inside the chambers using a sampling tube with 2.

대상 데이터

The experiment was conducted in a mature Platanus occidentalis forest on Hanyang University campus, Seoul, Republic of Korea (37°33'33''N, 127°02'47''E).

데이터처리

Independent-sample t-test was used to test the significant difference between control and litter P-(0-80) and NP-(0-80) treatments. One-way ANOVA was used to test the significant difference between the results of CH₄ emission in all treatments of P-(0-80) and NP-(0-80). F The difference level was set at p<0.

성능/효과

2%. Total estimated CH₄ uptake in this study was not significantly different from weekly and biweekly CH₄ uptake subtracted data (p=0.05).

후속연구

This decrease in CH₄ uptake was positively correlated with air filled porosity and negatively correlated with water filled pore space. Soil texture at experimental site was sandy loam, which is relatively coarse texture further studies needed to establish if the relationship between variable precipitation to CH₄ uptake holds true across different soil texture classes. Our results can be used as a reference for regions with similar conditions.

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