Methane and carbon dioxide fluxes from poorly drained adjacent cultivated and forest sites

1994 ◽  
Vol 74 (2) ◽  
pp. 139-146 ◽  
Author(s):  
R. Lessard ◽  
P. Rochette ◽  
E. Topp ◽  
E. Pattey ◽  
R. L Desjardins ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Spatial Variability ◽  
Soil Temperature ◽  
Forest Soil ◽  
Soil Surface ◽  
Gas Diffusion ◽  
Spatial And Temporal Variability ◽  
Strong Negative Correlation ◽  
Carbon Dioxide Fluxes ◽  
Methane Uptake

Methane and carbon dioxide fluxes at the soil surface were measured from April to November 1992 in Ottawa, on adjacent cultivated (corn) and forest (temperate woodland) sites using closed chambers (10 chambers per site). The objectives were to quantify the spatial and temporal variability of gas exchange rates, and to determine the effects of soil temperature and moisture on the fluxes. On the forest soil, rates of CO2 emissions and CH4 uptake ranged from 2.27 to 14.82 g m−2 d−1 and from 0.04 to 1.10 mg m−2 d−1, respectively. On the cultivated soil, the measured CO2 fluxes varied from 0.27 to 7.07 g m−2 d−1 while methane uptake ranged from 0 to 0.13 mg m−2 d−1. There was a positive correlation between soil surface CO2 fluxes and soil temperature for the forest (R2 = 0.74, s(ŷ) = 1.77 g m−2 d−1) and the cultivated (R2 = 0.48, s(ŷ) = 1.10 g m−2 d−1) sites. Temperature had little effect on methane uptake by the forest soil suggesting that gas diffusion was rate limiting. This was further substantiated by the observation that methane uptake showed a strong negative correlation with soil water content (R2 = 0.79, s(ŷ) = 0.12 mg m−2 d−1). The spatial variability for methane uptake in the forest soil was found to be much larger than that previously observed for soil carbon dioxide production but is lower than that reported for nitrous oxide production. For fluxes larger than 0.15 mg m−2 d−1, the number of sites necessary to estimate the average flux with a precision of 10% (α = 0.05) ranged from 7 to 452. Key words: Greenhouse gas, methane oxidation, soil respiration, spatial variability

In situ Mineralization of Dairy Cattle Manures as Determined using Soil-Surface Carbon Dioxide Fluxes

2006 ◽  
Vol 70 (3) ◽  
pp. 744-752 ◽  
Author(s):  
Philippe Rochette ◽  
Denis A. Angers ◽  
Martin H. Chantigny ◽  
Bernard Gagnon ◽  
Normand Bertrand
Keyword(s):  
Carbon Dioxide ◽  
Dairy Cattle ◽  
Soil Surface ◽  
Carbon Dioxide Fluxes ◽  
Surface Carbon

scholarly journals A comparison of six methods for measuring soil-surface carbon dioxide fluxes

1997 ◽  
Vol 102 (D24) ◽  
pp. 28771-28777 ◽  
Author(s):  
J. M. Norman ◽  
C. J. Kucharik ◽  
S. T. Gower ◽  
D. D. Baldocchi ◽  
P. M. Crill ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Soil Surface ◽  
Carbon Dioxide Fluxes ◽  
Surface Carbon

scholarly journals Intra-urban spatial variability of surface ozone and carbon dioxide in Riverside, CA: viability and validation of low-cost sensors

2017 ◽  
Author(s):  
Kira Sadighi ◽  
Evan Coffey ◽  
Andrea Polidori ◽  
Brandon Feenstra ◽  
Qin Lv ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Los Angeles ◽  
Spatial Variability ◽  
Low Cost ◽  
Surface Ozone ◽  
Calibration Method ◽  
Measurement Tool ◽  
Spatial And Temporal Variability ◽  
Air Quality Monitoring Stations ◽  
Binned Data

Abstract. Abstract. Sensor networks are being more widely used to characterize and understand compounds in the atmosphere such as ozone and carbon dioxide. This study employs a measurement tool, called the U-Pod, constructed at the University of Colorado Boulder, to investigate spatial and temporal variability of O3 and CO2 in a 314 km2 area of Riverside County near Los Angeles, California. This tool provides low-cost sensors to collect ambient data at non-permanent locations. The U-Pods were calibrated using a pre-deployment field calibration technique; all the U-Pods were collocated with regulatory monitors. After collocation, the U-Pods were deployed in the area mentioned. A subset of pods was deployed at two local regulatory air quality monitoring stations providing validation for the collocation calibration method. Field validation of sensor O3 and CO2 measurements to minute resolution reference observations resulted in R-squared and root mean squared errors (RMSE) of 0.95–0.97 and 4.4–7.2 ppbv for O3 and 0.79 and 15 ppmv CO2, respectively. Using the deployment data, ozone and carbon dioxide concentrations were observed to vary on this small spatial scale. In the analysis based on hourly binned data, the median R-squared values between all possible U-Pod pairs varied from 0.52 to 0.86 for ozone during the deployment. The medians of absolute differences were calculated between all possible pod pairs, 21 pairs total. The median values of those median absolute differences for each hour of the day varied between 2.2 and 9.3 ppb for the ozone deployment. For carbon dioxide, distributions of all measurements vary from 413–425 ppm during the calibration (collocation) and 406–472 during the deployment. Since median differences between U-Pod concentrations during deployment are larger than the respective root mean square error values for ozone and carbon dioxide, we can conclude that there is spatial variability in these pollutants across the study area. This is important because it means that citizens may be exposed to more ozone than they would assume based on current regulatory monitoring.

STUDI FLUKS KARBON DIOKSIDA PADA BERBAGAI TIPE PENGGUNAAN DI LAHAN GAMBUT PASANG SURUT DAN PEDALAMAN (Study of Carbon dioxide Fluxes (CO2 fluxes) on Various Land Use in Low Tide and Ombrotrophic Peatland)

AgriPeat ◽  
2019 ◽  
Vol 18 (02) ◽  
pp. 68-81
Author(s):  
Journal Journal
Keyword(s):  
Carbon Dioxide ◽  
Soil Moisture ◽  
Soil Temperature ◽  
Rubber Plantation ◽  
Co2 Fluxes ◽  
Forest Land ◽  
Carbon Dioxide Fluxes ◽  
Ombrotrophic Peatland ◽  
A Value ◽  
Burnt Areas

ABSTRACT The aim of this study to known Co2 fluxes in low tide and ombrotrophic peatland on forest land, ex- burns land, rubber tree land, and maize land and to known amount of microbial populations there. Observation method was carried out at the village Kalampangan (ombrotrophic peatland) , Sebangau, Palangka Raya, and at the village Purwodadi (low tide peatland), Maliku, Pulang Pisau, from May to July 2014. Observation variables consist of CO2 fluxes, fluctuations of groundwater levels, soil temperature, soil humidity and microbial populations. The results show that overall carbon dioxide fluxes higher in low tide peatland, with the highest fluxes in burnt areas, 430.24 mg C m-2 h-1, whereas in Ombrotrophic peatland, the highest on 292 forested land, 92 mg C m-2h-1. In Ombrotrophic peatland, relation between fluxes of carbon dioxide and the soil temperature is significant in the burnt areas with a value of R = 0.856 with a quadratic pattern, with the average temperature of 28.89 ° C. Fluxes of carbon dioxide significantly effected by soil moisture that is at a rubber plantation with a value of R = 0.640 with quadraticpatterned, average soil moisture of 0.61 m3/m-3. Fluxes of carbon dioxide to the groundwater depth is significant on a rubber plantation with a value of R = 0.872 with a quadratic pattern, and depth of groundwater on average of 83.74 cm. The populatuin of microorganisms, in forest land 137 sel/ml, rubber plantations 154 sel/ml, cornfields 157 sel/ml and ex-burnt is 80 sel/ml. In Low Tide peatland, fluxes of carbon dioxide to the soil temperature is significant in forest land with the value of R = 0.545 with cubic pattern, and the average temperature of 27,39 oC. Soil moisture has the siginificant effect to fluxes of carbon dioxide that is in the burnt areas with a value of R = 0.617 with patterned quadratic, and average soil moisture of 0.50 m3/m-3. The ground water depth has a siginificant effect to fluxes of carbon dioxide in a cornfield with a value of R = 0.743 with a quadratic pattern, and the depth of soil water on average of 68.98 cm. Population of soil microorganisms, in forest land 73 sel/ml, rubber plantations 36 sel/ml, cornfields 51 sel/ml and ex-burnt 18 sel/ml. Soil temperature, soil moisture, groundwater depth and microoganisms effect on carbon dioxide fluxes. Key words : carbondioxide, fluxes, microorganisms, peatland ABSTRAK Tujuan Penelitian adalah untuk mengetahui pengaruh tipe penggunaan lahan gambut pasang surut dan lahan gambut pedalaman, baik pada hutan alami, eks kebakaran, lahan pertanian (jagung) dan perkebunan karet terhadap fluks karbon dioksida dan mengetahui pengaruh jumlah mikroorganisme terhadap fluks karbon dioksida pada hutan alami, eks kebakaran, lahan pertanian (jagung) dan perkebunan karet pada kedua tipe lahan gambut tersebut. Penelitian dilaksanakan dari tanggal 23 Mei sampai dengan 19 Juli 2014 (2 bulan) di Kalampangan dan Purwodadi (Kanamit). Hasil Penelitian menunjukkan, fluks karbon dioksida secara keseluruhan lebih tinggi di Gambut Pasang Surut dibandingkan dengan di Pedalaman. Rata-rata fluks karbon dioksida di Gambut Pasang Surut, Jurnal AGRI PEAT, Vol. 18 No. 2 , September 2017 : 68 - 81 ISSN :1411 - 6782 69 pada lahan berhutan 285, 22 mg C m-2h-1, pada kebun karet 264,69 mg C m-2h-1, pada kebun jagung 232,08 mg C m-2h-1, pada lahan bekas kebakaran 430,24 mg C m-2h-1. Meskipun demikian, di Gambut Pedalaman, pada lahan berhutan lebih tinggi dibanding di Pasang Surut yaitu 292, 92 mg C m-2h-1, pada kebun karet 224,93 mg C m-2h-1, pada kebun jagung 211,30 mg C m-2h-1, pada lahan bekas kebakaran 228,07 mg C m-2h-1. Di Gambut Pedalaman, hubungan fluks karbon dioksida terhadap suhu tanah yang berpengaruh nyata yaitu pada areal bekas kebakaran dengan nilai R = 0,856 dengan berpola kuadratik, suhu rata-rata 28,89 oC. Fluks karbon dioksida terhadap kelembaban tanah yang berpengaruh nyata yaitu pada kebun karet dengan nilai R = 0,640 dengan berpola kuadratik, kelembaban tanah rata-rata 0,61 m3/m-3. Hubunganfluks karbon dioksida terhadap kedalaman air tanah yang berpengaruh nyata yaitu pada kebun karet dengan nilai R = 0,872 berpola kuadratik dengan kedalaman air tanah rata-rata 83,74 cm. Mikroorganisme, di lahan hutan 137 sel/ml, kebun karet 154 sel/ml, kebun jagung 157 sel/ml dan dilahan bekas kebakaran 80 sel/ml. Di Gambut Pasang Surut, hubungan fluks karbon dioksida terhadap suhu tanah yang berpengaruh nyata yaitu pada lahan hutan dengan nilai R = 0,545 dengan berpola kubik, suhu rata- rata 27,39 oC. Hubungan fluks karbon dioksida terhadap kelembaban tanah yang berpengaruh nyata yaitu pada lahan bekas kebakaran dengan nilai R = 0,617 dengan berpola kuadratik, kelembaban tanah rata-rata 0,50 m3/m-3. Hubungan fluks karbon dioksida terhadap kedalaman air tanah yang berpengaruh nyata yaitu pada kebun jagung dengan nilai R = 0,743 berpola kuadratik dengan kedalaman air tanah rata-rata 68,98 cm. Mikroorganisme, di lahan hutan 73 sel/ml, kebun karet 36 sel/ml, kebun jagung 51 sel/ml dan dilahan bekas kebakaran 18 sel/ml. Suhu tanah, kelembaban tanah, kedalaman air tanah berpengaruh terhadap fluks karbon dioksida dan mikroorganisme pengaruhnya kecil. Kata kunci : carbondioxide, fluxes, microorganisms, peatland

Soil carbon dioxide fluxes and profile concentrations in two boreal forests

1998 ◽  
Vol 28 (12) ◽  
pp. 1773-1783 ◽  
Author(s):  
S A Billings ◽  
D D Richter ◽  
J Yarie
Keyword(s):  
Soil Respiration ◽  
Soil Temperature ◽  
Boreal Forests ◽  
Large Fraction ◽  
Summer Precipitation ◽  
Soil Surface ◽  
Surface Flux ◽  
Control Site ◽  
Carbon Dioxide Fluxes ◽  
Soil Response

Because a large fraction of the world's carbon exists in the soil of boreal forests, understanding how soil temperature and moisture affect soil respiration is vital for predicting soil response to climate change. We measured soil respiration and CO2 concentrations within soils of floodplain and upland forests in interior Alaska from 1996 to 1997. At each site, a 0.10-ha-area shelter was constructed that prevents summer precipitation from infiltrating into the soil. Measurements of soil profile CO2, soil respiration, soil temperature, and soil moisture were made inside (treatment) and outside (control) the sheltered areas through two growing seasons and the winter of 1996-1997. Sheltered soils had decreased profile concentrations and surface flux of CO2. At the upland control site, individual flux rates ranged from 0.10 to 0.95 g·m-2·h-1 in the summer and at sites under the shelter from 0.10 to 0.53 g·m-2·h-1. Rates at the floodplain control site ranged from 0.11 to 1.45 g·m-2·h-1 and under the shelter from 0.11 to 0.55 g·m-2·h-1. Fick's Law could predict surface CO2 flux when the CO2 concentration gradient within the profile accurately represented the soil surface gradient and biological sources and sinks of the gas did not overwhelm flux calculations.

scholarly journals Tower and Aircraft Eddy Covariance Measurements of Water Vapor, Energy, and Carbon Dioxide Fluxes during SMACEX

2005 ◽  
Vol 6 (6) ◽  
pp. 954-960 ◽  
Author(s):  
J. H. Prueger ◽  
J. L. Hatfield ◽  
T. B. Parkin ◽  
W. P. Kustas ◽  
L. E. Hipps ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Water Vapor ◽  
Eddy Covariance ◽  
Spatial And Temporal Variability ◽  
Co2 Fluxes ◽  
Sensible Heat ◽  
Carbon Dioxide Fluxes ◽  
Crop Growth Stage ◽  
Aircraft Flux Measurements ◽  
Carbon Dioxide Co2

Abstract A network of eddy covariance (EC) and micrometeorological flux (METFLUX) stations over corn (Zea mays L.) and soybean [Glycine max (L.) Merr.] canopies was established as part of the Soil Moisture–Atmosphere Coupling Experiment (SMACEX) in central Iowa during the summer of 2002 to measure fluxes of heat, water vapor, and carbon dioxide (CO2) during the growing season. Additionally, EC measurements of water vapor and CO2 fluxes from an aircraft platform complemented the tower-based measurements. Sensible heat, water vapor, and CO2 fluxes showed the greatest spatial and temporal variability during the early crop growth stage. Differences in all of the energy balance components were detectable between corn and soybean as well as within similar crops throughout the study period. Tower network–averaged fluxes of sensible heat, water vapor, and CO2 were observed to be in good agreement with area-averaged aircraft flux measurements.

scholarly journals Boreal forest soil is a significant and diverse source of volatile organic compounds

2018 ◽  
Author(s):  
Mari Mäki ◽  
Hermanni Aaltonen ◽  
Jussi Heinonsalo ◽  
Heidi Hellén ◽  
Jukka Pumpanen ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Forest Soil ◽  
Organic Compounds ◽  
Coniferous Forest ◽  
Soil Surface ◽  
Surface Flux ◽  
Gas Diffusion ◽  
Oxidation Products ◽  
Volatile Organic ◽  
Flux Measurements

Abstract. Vegetation emissions of volatile organic compounds (VOCs) are intensively studied world-wide because oxidation products of VOCs contribute to atmospheric processes, but the quantities by which different species of VOCs are produced by soil, or how effectively belowground VOCs are released into the atmosphere from soil remains largely unknown. This is the first published study that measures belowground VOC concentrations at different depths in a podzol combined with simultaneous soil surface flux measurements in a boreal coniferous forest. More than 50 VOCs, dominated by monoterpenes and sesquiterpenes, were detected in the air space in the soil during the two measurement campaigns. Organic forest soil was a significant monoterpene source as it contained fresh isoprenoid-rich litter, and the concentrations of monoterpenes were comparable to the VOC concentrations in the air above the coniferous forest. Belowground monoterpene concentrations were largely decoupled from forest floor monoterpene fluxes; thus, it seems that production processes and storages of VOCs partly differ from those VOCs that are simultaneously emitted from the soil surface. Relatively high isoprenoid concentrations were measured under snow cover, which indicates that snow and ice cover hinders gas diffusion and causes belowground accumulation of VOCs when the activity of vegetation is very low.

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