Influences of snow cover and soil-frost on ground surface flux and soil gas concentration of CO2 in an agricultural land in northern Japan

Ohkubo, S.; Yanai, Yosuke; Nagata, Osamu; Iwata, Yukiyoshi; Hirota, Tomoyoshi

doi:10.2480/agrmet.67.3.9

Cited by 4 publications

(2 citation statements)

References 30 publications

(38 reference statements)

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“…The soil CO 2 concentration was measured manually each week using the sampling technique described in Ohkubo et al (2011), with a silicone tube. Silicone tubes (1.0 m long, 10-mm ID, 13-mm OD) that were covered with perforated polyvinyl chloride (PVC) pipe were installed horizontally at depths of 0, 10, 20, 30 and 40 cm.…”

Section: Meteorological Observationmentioning

confidence: 99%

Estimating NEE in a wheat-planted plot with an automatically controlled chamber

Ohkubo

Nagata

Hirota

2015

Soil Science and Plant Nutrition

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We observed carbon dioxide (CO 2 ) flux at two experimental plots (wheat (Triticum aestivum L.) -planted and bare) for a year using an automatically controlled chamber. At each plot, two chambers were installed at six observation points by rotation. Consequently, the total installment duration at each point was one-third of the entire experimental period. Although we manually moved the chambers periodically, they hampered wheat growth and reduced the dried weight of harvested wheat by 65%. However, they did not influence the carbon (C) content ratio of harvested wheat. The rate of decrease of soil water contents after rainfall in the wheat plot was higher than that in the bare plot, especially after the canopy height reached around 30 cm. The maximum gap of soil water content at 5 cm depth between the two plots was about 5%. Wheat mitigated the increase of soil temperature in the daytime. The gap of soil temperature at 2 cm depth between the two plots sometimes exceeded 10°C. Considering the difference between dried weights of harvested wheat per unit ground area inside and outside the chamber collar, the annual net ecosystem exchange (NEE), whole ecosystem respiration and gross primary production were estimated respectively as -103 g C m ). Although further improvements of measurements and more accurate estimated equations are necessary to evaluate the carbon budget correctly with chamber measurements, our chamber measurement captured the NEE variation, responding to seasonal, meteorological and biological changes.

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Section: Meteorological Observationmentioning

confidence: 99%

Estimating NEE in a wheat-planted plot with an automatically controlled chamber

Ohkubo

Nagata

Hirota

2015

Soil Science and Plant Nutrition

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“…The western site is located in the Ishikari district (141°25¢E, 43°05¢N; Sapporo site) and the eastern site is located in the Tokachi district (143°04¢E, 42°53¢N; Memuro site). The soil type at both sites is an andisol Ohkubo et al 2011); one of the typical cropland soils in Hokkaido. The weather conditions at the two sites differ.…”

Section: Estimation Of Load Factors For Snow Cover Management Practicesmentioning

confidence: 99%

Snow cover manipulation in agricultural fields: as an option for mitigating greenhouse gas emissions

Yanai

Hirota

Iwata

et al. 2014

Ecological Research

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Short‐term N2O emission occurs in relation to snowmelt within seasonally frozen soil. To understand the effects of changing winter climates on the N2O flux, snow cover manipulation experiments are useful. In Japan, snow cover manipulation is practiced by farmers to improve agricultural yield and is executed either by applying a broadcast of blackish agent onto the snow cover, which leads to faster snow‐melting thereby extending the crop‐growing season, or by snow cover removal/re‐accumulation, leading to an enhanced soil frost depth for weed management. Implementation of these practices involves using an amount of fossil fuel, in addition to influencing soil‐derived N2O emissions, therefore, the load factors of snow cover management practices per unit area of agricultural field were estimated in this study. Field data including micrometeorological conditions, ground surface flux of N2O, and amount of fossil fuel consumed during machinery operation for management practices, were obtained at two sites in Hokkaido over 2 years (2008–2010). Fuel consumption for the field spreading was found to be unexpectedly small (0.017 Mg CO2 eq ha−1). It was therefore suggested that acceleration of snowmelt may have the potential to reduce net greenhouse gas emissions if the agent used is a low‐degradable C‐rich material, such as charcoal. For soil frost control, the fossil fuel consumption during a set of snow cover removal/re‐accumulation (estimated as 0.052 Mg CO2 eq ha−1) is discussed, together with the relationship between possible mechanisms causing stimulation of N2O production in frozen soil and inherent large differences in N2O flux among sites.

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Effects of phase change material inclusion on reducing greenhouse gas emissions from soil in cold region

Kravchenko,

Wang,

2023

Environ Sci Pollut Res

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Influences of snow cover and soil-frost on ground surface flux and soil gas concentration of CO2 in an agricultural land in northern Japan

Cited by 4 publications

References 30 publications

Estimating NEE in a wheat-planted plot with an automatically controlled chamber

Estimating NEE in a wheat-planted plot with an automatically controlled chamber

Snow cover manipulation in agricultural fields: as an option for mitigating greenhouse gas emissions

Effects of phase change material inclusion on reducing greenhouse gas emissions from soil in cold region

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