Vertical structure and diurnal variability of ammonia exchange potential within an intensively managed grass canopy

B Herrmann, M Mattsson, SK Jones, P Cellier, C Milford, MA Sutton, JK Schjoerring, A Neftel

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Abstract

Stomatal ammonia compensation points (s ) of grass species on a mixed fertilized grassland were determined by measurements of apoplastic [NH+4 ] and [H+] in the field. Calculated s values were compared with in-canopy
atmospheric NH3 concentration (a) measurements. Leaf apoplastic [NH+
4 ] increased by a factor of two from the lowest level in the canopy to the top level. Bulk leaf [NH+4 ] and especially [NO−3 ] slightly increased at the bottom
of the canopy and these concentrations were very high in senescent plant litter. Calculated s values were below atmospheric a at all canopy levels measured, indicating that the grassland was characterized by NH3 deposition before cutting. This was confirmed by the a profile, showing the lowest a close to the ground (15 cm above soil surface) and an increase in a with canopy height. Neither s nor a could be measured close to the soil surface, however, the [NH+
4 ] in the litter material indicated a high potential for NH3 emission.
A diurnal course in apoplastic [NH+ 4 ] was seen in the regrowing
grass growing after cutting, with highest concentration around noon. Both apoplastic and tissue [NH+ 4 ] increased in young grass compared to tall grass. Following cutting, in-canopy gradients of atmospheric a showed NH3
emission but since calculated s values of the cut grass were still lower than atmospheric NH3 concentrations, the emissions could not entirely be explained by stomatal NH3 loss. High tissue [NH+ 4 ] in the senescent plant material indicated that this fraction constituted an NH3 source. After fertilization,
[NH+ 4 ] increased both in apoplast and leaf tissue with the most pronounced increase in the former compared to the latter. The diurnal pattern in apoplastic [NH+ 4 ] was even more pronounced after fertilization and calculated s values
were generally higher, but remained below atmospheric [NH3].
Original languageEnglish
Pages (from-to)15-23
JournalBiogeosciences
Volume6
DOIs
Publication statusPrint publication - 2009

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ammonia
canopy
grass
grasses
soil surface
litter
grasslands
grassland
leaves
apoplast
diurnal variation
plant litter
soil
tissues
tissue
cutting (process)
material

Cite this

Herrmann, B ; Mattsson, M ; Jones, SK ; Cellier, P ; Milford, C ; Sutton, MA ; Schjoerring, JK ; Neftel, A. / Vertical structure and diurnal variability of ammonia exchange potential within an intensively managed grass canopy. In: Biogeosciences. 2009 ; Vol. 6. pp. 15-23.
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abstract = "Stomatal ammonia compensation points (s ) of grass species on a mixed fertilized grassland were determined by measurements of apoplastic [NH+4 ] and [H+] in the field. Calculated s values were compared with in-canopyatmospheric NH3 concentration (a) measurements. Leaf apoplastic [NH+4 ] increased by a factor of two from the lowest level in the canopy to the top level. Bulk leaf [NH+4 ] and especially [NO−3 ] slightly increased at the bottomof the canopy and these concentrations were very high in senescent plant litter. Calculated s values were below atmospheric a at all canopy levels measured, indicating that the grassland was characterized by NH3 deposition before cutting. This was confirmed by the a profile, showing the lowest a close to the ground (15 cm above soil surface) and an increase in a with canopy height. Neither s nor a could be measured close to the soil surface, however, the [NH+4 ] in the litter material indicated a high potential for NH3 emission.A diurnal course in apoplastic [NH+ 4 ] was seen in the regrowinggrass growing after cutting, with highest concentration around noon. Both apoplastic and tissue [NH+ 4 ] increased in young grass compared to tall grass. Following cutting, in-canopy gradients of atmospheric a showed NH3emission but since calculated s values of the cut grass were still lower than atmospheric NH3 concentrations, the emissions could not entirely be explained by stomatal NH3 loss. High tissue [NH+ 4 ] in the senescent plant material indicated that this fraction constituted an NH3 source. After fertilization,[NH+ 4 ] increased both in apoplast and leaf tissue with the most pronounced increase in the former compared to the latter. The diurnal pattern in apoplastic [NH+ 4 ] was even more pronounced after fertilization and calculated s valueswere generally higher, but remained below atmospheric [NH3].",
author = "B Herrmann and M Mattsson and SK Jones and P Cellier and C Milford and MA Sutton and JK Schjoerring and A Neftel",
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Herrmann, B, Mattsson, M, Jones, SK, Cellier, P, Milford, C, Sutton, MA, Schjoerring, JK & Neftel, A 2009, 'Vertical structure and diurnal variability of ammonia exchange potential within an intensively managed grass canopy', Biogeosciences, vol. 6, pp. 15-23. https://doi.org/10.5194/bg-6-15-2009

Vertical structure and diurnal variability of ammonia exchange potential within an intensively managed grass canopy. / Herrmann, B; Mattsson, M; Jones, SK; Cellier, P; Milford, C; Sutton, MA; Schjoerring, JK; Neftel, A.

In: Biogeosciences, Vol. 6, 2009, p. 15-23.

Research output: Contribution to journalArticle

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T1 - Vertical structure and diurnal variability of ammonia exchange potential within an intensively managed grass canopy

AU - Herrmann, B

AU - Mattsson, M

AU - Jones, SK

AU - Cellier, P

AU - Milford, C

AU - Sutton, MA

AU - Schjoerring, JK

AU - Neftel, A

PY - 2009

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N2 - Stomatal ammonia compensation points (s ) of grass species on a mixed fertilized grassland were determined by measurements of apoplastic [NH+4 ] and [H+] in the field. Calculated s values were compared with in-canopyatmospheric NH3 concentration (a) measurements. Leaf apoplastic [NH+4 ] increased by a factor of two from the lowest level in the canopy to the top level. Bulk leaf [NH+4 ] and especially [NO−3 ] slightly increased at the bottomof the canopy and these concentrations were very high in senescent plant litter. Calculated s values were below atmospheric a at all canopy levels measured, indicating that the grassland was characterized by NH3 deposition before cutting. This was confirmed by the a profile, showing the lowest a close to the ground (15 cm above soil surface) and an increase in a with canopy height. Neither s nor a could be measured close to the soil surface, however, the [NH+4 ] in the litter material indicated a high potential for NH3 emission.A diurnal course in apoplastic [NH+ 4 ] was seen in the regrowinggrass growing after cutting, with highest concentration around noon. Both apoplastic and tissue [NH+ 4 ] increased in young grass compared to tall grass. Following cutting, in-canopy gradients of atmospheric a showed NH3emission but since calculated s values of the cut grass were still lower than atmospheric NH3 concentrations, the emissions could not entirely be explained by stomatal NH3 loss. High tissue [NH+ 4 ] in the senescent plant material indicated that this fraction constituted an NH3 source. After fertilization,[NH+ 4 ] increased both in apoplast and leaf tissue with the most pronounced increase in the former compared to the latter. The diurnal pattern in apoplastic [NH+ 4 ] was even more pronounced after fertilization and calculated s valueswere generally higher, but remained below atmospheric [NH3].

AB - Stomatal ammonia compensation points (s ) of grass species on a mixed fertilized grassland were determined by measurements of apoplastic [NH+4 ] and [H+] in the field. Calculated s values were compared with in-canopyatmospheric NH3 concentration (a) measurements. Leaf apoplastic [NH+4 ] increased by a factor of two from the lowest level in the canopy to the top level. Bulk leaf [NH+4 ] and especially [NO−3 ] slightly increased at the bottomof the canopy and these concentrations were very high in senescent plant litter. Calculated s values were below atmospheric a at all canopy levels measured, indicating that the grassland was characterized by NH3 deposition before cutting. This was confirmed by the a profile, showing the lowest a close to the ground (15 cm above soil surface) and an increase in a with canopy height. Neither s nor a could be measured close to the soil surface, however, the [NH+4 ] in the litter material indicated a high potential for NH3 emission.A diurnal course in apoplastic [NH+ 4 ] was seen in the regrowinggrass growing after cutting, with highest concentration around noon. Both apoplastic and tissue [NH+ 4 ] increased in young grass compared to tall grass. Following cutting, in-canopy gradients of atmospheric a showed NH3emission but since calculated s values of the cut grass were still lower than atmospheric NH3 concentrations, the emissions could not entirely be explained by stomatal NH3 loss. High tissue [NH+ 4 ] in the senescent plant material indicated that this fraction constituted an NH3 source. After fertilization,[NH+ 4 ] increased both in apoplast and leaf tissue with the most pronounced increase in the former compared to the latter. The diurnal pattern in apoplastic [NH+ 4 ] was even more pronounced after fertilization and calculated s valueswere generally higher, but remained below atmospheric [NH3].

U2 - 10.5194/bg-6-15-2009

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