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Martti Esala - One of the best experts on this subject based on the ideXlab platform.

  • contribution of nitrification and denitrification to n2o production in peat clay and Loamy Sand Soils under different soil moisture conditions
    Nutrient Cycling in Agroecosystems, 2004
    Co-Authors: Mari Pihlatie, Eija Syväsalo, Martti Esala, Asko Simojoki, Kristiina Regina
    Abstract:

    Agricultural Soils are a significant source of nitrous oxide (N2O). Since mitigation of greenhouse gas emissions is needed in all sectors of society, it is important to identify the processes producing N2O and the factors affecting the production rates in agricultural Soils. This study aimed to elucidate the N2O production in peat, clay and Loamy Sand at four different soil moisture conditions (40, 60, 80 and 100% Water Filled Pore Space). The ace­tylene inhibition technique was used to evaluate the contribution of nitrification to N2O production. Nitrous oxide production responded markedly to soil moisture in all three Soils. The highest N2O production, measured at the wettest Soils (100% WFPS), was up to four orders of magnitude higher than that at the dry Soils (40% WFPS). In dry conditions N2O production decreased in the order of peat > clay > Loamy Sand, while in wet conditions the highest N2O production was measured in Loamy Sand, then in peat, and the lowest in clay Soils. Nitrification was the dominant N2O producing process in all the Soils at 60% WFPS. In the Sandy soil 70% of the total N2O production originated from nitrification, while in the peat soil most of the total N2O production originated from denitrification. Data on processes producing N2O in agricultural Soils are needed to develop process-based models that could reduce the uncertainty of the emission estimates in greenhouse gas inventories.

  • Emissions of nitrous oxide from boreal agricultural clay and Loamy Sand Soils
    Nutrient Cycling in Agroecosystems, 2004
    Co-Authors: Eija Syväsalo, Kristiina Regina, Mari Pihlatie, Martti Esala
    Abstract:

    Long-term studies of greenhouse gas fluxes from agricultural Soils in different climate regions are needed to improve the existing calculation models used in greenhouse gas inventories. The aim of this study was to obtain more information on nitrous oxide (N_2O) emissions from agricultural mineral Soils in the boreal region. N_2O emissions were studied during 2000–2002 on two soil types in Finland, a Loamy Sand and a clay with plots of grass, barley and fallow. N_2O fluxes were measured with static chambers throughout the year. Other parameters measured were water filled pore space (WFPS), soil mineral nitrogen concentration, soil porosity, soil temperature and depth of soil frost. The annual fluxes from the clay soil ranged from 3.7 to 7.8 kg N ha^–1 and those from Sandy loam from 1.5 to 7.5 kg N ha^–1. On average 60% of the annual fluxes occurred outside the growing season, from October to April. Increasing the number of freeze-thaw events was found to increase the fluxes during winter and during the thawing period in spring. The results suggest that N_2O fluxes from these boreal mineral Soils do not vary much as a function of applied fertiliser N and could probably be better estimated from soil physical properties, including soil porosity.

Kristiina Regina - One of the best experts on this subject based on the ideXlab platform.

  • contribution of nitrification and denitrification to n2o production in peat clay and Loamy Sand Soils under different soil moisture conditions
    Nutrient Cycling in Agroecosystems, 2004
    Co-Authors: Mari Pihlatie, Eija Syväsalo, Martti Esala, Asko Simojoki, Kristiina Regina
    Abstract:

    Agricultural Soils are a significant source of nitrous oxide (N2O). Since mitigation of greenhouse gas emissions is needed in all sectors of society, it is important to identify the processes producing N2O and the factors affecting the production rates in agricultural Soils. This study aimed to elucidate the N2O production in peat, clay and Loamy Sand at four different soil moisture conditions (40, 60, 80 and 100% Water Filled Pore Space). The ace­tylene inhibition technique was used to evaluate the contribution of nitrification to N2O production. Nitrous oxide production responded markedly to soil moisture in all three Soils. The highest N2O production, measured at the wettest Soils (100% WFPS), was up to four orders of magnitude higher than that at the dry Soils (40% WFPS). In dry conditions N2O production decreased in the order of peat > clay > Loamy Sand, while in wet conditions the highest N2O production was measured in Loamy Sand, then in peat, and the lowest in clay Soils. Nitrification was the dominant N2O producing process in all the Soils at 60% WFPS. In the Sandy soil 70% of the total N2O production originated from nitrification, while in the peat soil most of the total N2O production originated from denitrification. Data on processes producing N2O in agricultural Soils are needed to develop process-based models that could reduce the uncertainty of the emission estimates in greenhouse gas inventories.

  • Emissions of nitrous oxide from boreal agricultural clay and Loamy Sand Soils
    Nutrient Cycling in Agroecosystems, 2004
    Co-Authors: Eija Syväsalo, Kristiina Regina, Mari Pihlatie, Martti Esala
    Abstract:

    Long-term studies of greenhouse gas fluxes from agricultural Soils in different climate regions are needed to improve the existing calculation models used in greenhouse gas inventories. The aim of this study was to obtain more information on nitrous oxide (N_2O) emissions from agricultural mineral Soils in the boreal region. N_2O emissions were studied during 2000–2002 on two soil types in Finland, a Loamy Sand and a clay with plots of grass, barley and fallow. N_2O fluxes were measured with static chambers throughout the year. Other parameters measured were water filled pore space (WFPS), soil mineral nitrogen concentration, soil porosity, soil temperature and depth of soil frost. The annual fluxes from the clay soil ranged from 3.7 to 7.8 kg N ha^–1 and those from Sandy loam from 1.5 to 7.5 kg N ha^–1. On average 60% of the annual fluxes occurred outside the growing season, from October to April. Increasing the number of freeze-thaw events was found to increase the fluxes during winter and during the thawing period in spring. The results suggest that N_2O fluxes from these boreal mineral Soils do not vary much as a function of applied fertiliser N and could probably be better estimated from soil physical properties, including soil porosity.

Eija Syväsalo - One of the best experts on this subject based on the ideXlab platform.

  • contribution of nitrification and denitrification to n2o production in peat clay and Loamy Sand Soils under different soil moisture conditions
    Nutrient Cycling in Agroecosystems, 2004
    Co-Authors: Mari Pihlatie, Eija Syväsalo, Martti Esala, Asko Simojoki, Kristiina Regina
    Abstract:

    Agricultural Soils are a significant source of nitrous oxide (N2O). Since mitigation of greenhouse gas emissions is needed in all sectors of society, it is important to identify the processes producing N2O and the factors affecting the production rates in agricultural Soils. This study aimed to elucidate the N2O production in peat, clay and Loamy Sand at four different soil moisture conditions (40, 60, 80 and 100% Water Filled Pore Space). The ace­tylene inhibition technique was used to evaluate the contribution of nitrification to N2O production. Nitrous oxide production responded markedly to soil moisture in all three Soils. The highest N2O production, measured at the wettest Soils (100% WFPS), was up to four orders of magnitude higher than that at the dry Soils (40% WFPS). In dry conditions N2O production decreased in the order of peat > clay > Loamy Sand, while in wet conditions the highest N2O production was measured in Loamy Sand, then in peat, and the lowest in clay Soils. Nitrification was the dominant N2O producing process in all the Soils at 60% WFPS. In the Sandy soil 70% of the total N2O production originated from nitrification, while in the peat soil most of the total N2O production originated from denitrification. Data on processes producing N2O in agricultural Soils are needed to develop process-based models that could reduce the uncertainty of the emission estimates in greenhouse gas inventories.

  • Emissions of nitrous oxide from boreal agricultural clay and Loamy Sand Soils
    Nutrient Cycling in Agroecosystems, 2004
    Co-Authors: Eija Syväsalo, Kristiina Regina, Mari Pihlatie, Martti Esala
    Abstract:

    Long-term studies of greenhouse gas fluxes from agricultural Soils in different climate regions are needed to improve the existing calculation models used in greenhouse gas inventories. The aim of this study was to obtain more information on nitrous oxide (N_2O) emissions from agricultural mineral Soils in the boreal region. N_2O emissions were studied during 2000–2002 on two soil types in Finland, a Loamy Sand and a clay with plots of grass, barley and fallow. N_2O fluxes were measured with static chambers throughout the year. Other parameters measured were water filled pore space (WFPS), soil mineral nitrogen concentration, soil porosity, soil temperature and depth of soil frost. The annual fluxes from the clay soil ranged from 3.7 to 7.8 kg N ha^–1 and those from Sandy loam from 1.5 to 7.5 kg N ha^–1. On average 60% of the annual fluxes occurred outside the growing season, from October to April. Increasing the number of freeze-thaw events was found to increase the fluxes during winter and during the thawing period in spring. The results suggest that N_2O fluxes from these boreal mineral Soils do not vary much as a function of applied fertiliser N and could probably be better estimated from soil physical properties, including soil porosity.

Mari Pihlatie - One of the best experts on this subject based on the ideXlab platform.

  • contribution of nitrification and denitrification to n2o production in peat clay and Loamy Sand Soils under different soil moisture conditions
    Nutrient Cycling in Agroecosystems, 2004
    Co-Authors: Mari Pihlatie, Eija Syväsalo, Martti Esala, Asko Simojoki, Kristiina Regina
    Abstract:

    Agricultural Soils are a significant source of nitrous oxide (N2O). Since mitigation of greenhouse gas emissions is needed in all sectors of society, it is important to identify the processes producing N2O and the factors affecting the production rates in agricultural Soils. This study aimed to elucidate the N2O production in peat, clay and Loamy Sand at four different soil moisture conditions (40, 60, 80 and 100% Water Filled Pore Space). The ace­tylene inhibition technique was used to evaluate the contribution of nitrification to N2O production. Nitrous oxide production responded markedly to soil moisture in all three Soils. The highest N2O production, measured at the wettest Soils (100% WFPS), was up to four orders of magnitude higher than that at the dry Soils (40% WFPS). In dry conditions N2O production decreased in the order of peat > clay > Loamy Sand, while in wet conditions the highest N2O production was measured in Loamy Sand, then in peat, and the lowest in clay Soils. Nitrification was the dominant N2O producing process in all the Soils at 60% WFPS. In the Sandy soil 70% of the total N2O production originated from nitrification, while in the peat soil most of the total N2O production originated from denitrification. Data on processes producing N2O in agricultural Soils are needed to develop process-based models that could reduce the uncertainty of the emission estimates in greenhouse gas inventories.

  • Emissions of nitrous oxide from boreal agricultural clay and Loamy Sand Soils
    Nutrient Cycling in Agroecosystems, 2004
    Co-Authors: Eija Syväsalo, Kristiina Regina, Mari Pihlatie, Martti Esala
    Abstract:

    Long-term studies of greenhouse gas fluxes from agricultural Soils in different climate regions are needed to improve the existing calculation models used in greenhouse gas inventories. The aim of this study was to obtain more information on nitrous oxide (N_2O) emissions from agricultural mineral Soils in the boreal region. N_2O emissions were studied during 2000–2002 on two soil types in Finland, a Loamy Sand and a clay with plots of grass, barley and fallow. N_2O fluxes were measured with static chambers throughout the year. Other parameters measured were water filled pore space (WFPS), soil mineral nitrogen concentration, soil porosity, soil temperature and depth of soil frost. The annual fluxes from the clay soil ranged from 3.7 to 7.8 kg N ha^–1 and those from Sandy loam from 1.5 to 7.5 kg N ha^–1. On average 60% of the annual fluxes occurred outside the growing season, from October to April. Increasing the number of freeze-thaw events was found to increase the fluxes during winter and during the thawing period in spring. The results suggest that N_2O fluxes from these boreal mineral Soils do not vary much as a function of applied fertiliser N and could probably be better estimated from soil physical properties, including soil porosity.

Daniel Eduardo Buschiazzo - One of the best experts on this subject based on the ideXlab platform.

  • soil properties related to potential particulate matter emissions pm10 of Sandy Soils
    Aeolian Research, 2012
    Co-Authors: Silvia Beatriz Aimar, Daniel Eduardo Buschiazzo, Mariano Javier Mendez, Roger Funk
    Abstract:

    Little information is available on the effect of properties of coarse textured Soils on the emission of fine particulate matter (PM10). In this study was evaluated the effect of textural fractions (clay, silt and Sand), organic matter contents (OM) and soil moisture of 7 Sandy to Loamy-Sand Soils on potential PM10 emissions by means of wind tunnel simulations. PM10 emissions decreases linearly along the whole soil moisture range in loess developed Soils (Anguil and Santa Rosa), and above a given soil moisture in Soils developed on Sandy sediments (Villa Mercedes, Abra Pampa, Potrok Aike, Rio Mayo and Pilcaniyeu). Soils with higher PM10 emissions had high threshold moisture contents (TMC, soil moisture above which the PM10 emission was negligible) excepting for Potrok Aike (PA) that had low PM10 emissions and high TMC (8%) as a consequence of its relative high OM contents. Moisture effects on PM10 emissions decreased in a logarithmic way when OM contents increased in relation to soil silt contents (P < 0.01). In general, maximum PM10 emissions were higher in Soils with higher silt contents, excepting PA which