![Carbon dioxide, nitrous oxide and methane dynamics in boreal organic agricultural soils with different soil characteristics [An article from: Soil Biology and Biochemistry]](https://www.ebooknetworking.net/books/B00/0RQ/bigB000RQZP98.jpg)
Carbon dioxide, nitrous oxide and methane dynamics in boreal organic agricultural soils with different soil characteristics [An article from: Soil Biology and Biochemistry]
Description
This digital document is a journal article from Soil Biology and Biochemistry, published by Elsevier in 2004. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
The annual carbon dioxide (CO"2), nitrous oxide (N"2O) and methane (CH"4) dynamics were measured with static chambers on two organic agricultural soils with different soil characteristics. Site 1 had a peat layer of 30cm, with an organic matter (OM) content of 74% in the top 20cm. Site 2 had a peat layer of 70cm but an OM content of only 40% in the top 20cm. On both sites there were plots under barley and grass and also plots where the vegetation was removed. All soils were net sources of CO"2 and N"2O, but they consumed atmospheric CH"4. Soils under barley had higher net CO"2 emissions (830g CO"2-C m^-^2yr^-^1) and N"2O emissions (848mg N"2O-N m^-^2yr^-^1) than those under grass (395g CO"2-C m^-^3 yr^-^1 and 275mg N"2O-N m^-^2yr^-^1). Bare soils had the highest N"2O emissions, mean 2350mg N"2O-N m^-^2yr^-^1. The mean CH"4 uptake rate from vegetated soils was 100mg CH"4-C m^-^3yr^-^1 and from bare soils 55mg CH"4-C m^-^2yr^-^1. The net CO"2 emissions were higher from Site 2, which had a high peat bulk density and a low OM content derived from the addition of mineral soil to the peat during the cultivation history of that site. Despite the differences in soil characteristics, the mean N"2O emissions were similar from vegetated peat soils from both sites. However, bare soils from Site 2 with mineral soil addition had N"2O emissions of 2-9 times greater than those from Site 1. Site 1 consumed atmospheric CH"4 at a higher rate than Site 2 with additional mineral soil. N"2O emissions during winter were an important component of the N"2O budget even though they varied greatly, ranging from 2 to 99% (mean 26%) of the annual emission.
Description:
The annual carbon dioxide (CO"2), nitrous oxide (N"2O) and methane (CH"4) dynamics were measured with static chambers on two organic agricultural soils with different soil characteristics. Site 1 had a peat layer of 30cm, with an organic matter (OM) content of 74% in the top 20cm. Site 2 had a peat layer of 70cm but an OM content of only 40% in the top 20cm. On both sites there were plots under barley and grass and also plots where the vegetation was removed. All soils were net sources of CO"2 and N"2O, but they consumed atmospheric CH"4. Soils under barley had higher net CO"2 emissions (830g CO"2-C m^-^2yr^-^1) and N"2O emissions (848mg N"2O-N m^-^2yr^-^1) than those under grass (395g CO"2-C m^-^3 yr^-^1 and 275mg N"2O-N m^-^2yr^-^1). Bare soils had the highest N"2O emissions, mean 2350mg N"2O-N m^-^2yr^-^1. The mean CH"4 uptake rate from vegetated soils was 100mg CH"4-C m^-^3yr^-^1 and from bare soils 55mg CH"4-C m^-^2yr^-^1. The net CO"2 emissions were higher from Site 2, which had a high peat bulk density and a low OM content derived from the addition of mineral soil to the peat during the cultivation history of that site. Despite the differences in soil characteristics, the mean N"2O emissions were similar from vegetated peat soils from both sites. However, bare soils from Site 2 with mineral soil addition had N"2O emissions of 2-9 times greater than those from Site 1. Site 1 consumed atmospheric CH"4 at a higher rate than Site 2 with additional mineral soil. N"2O emissions during winter were an important component of the N"2O budget even though they varied greatly, ranging from 2 to 99% (mean 26%) of the annual emission.
