Partitioning of respiration in an intensively managed grassland

Kenneth A. Byrne; Ger Kiely

doi:10.1007/s11104-005-6065-z

Partitioning of respiration in an intensively managed grassland

Kenneth A. Byrne, Ger Kiely

University College Cork

Research output: Contribution to journal › Article › peer-review

Abstract

Total (R _TOT) and heterotrophic (R _H) respiration were measured in an intensively managed perennial ryegrass (Lolium perenne L.) grassland. The overall aim of the study was to partition R _TOT into R _H and autotrophic respiration (R _A). This was achieved as follows: (1) analyse the effect of air temperature, soil moisture content and leaf area index on R _TOT and the influence of soil temperature and soil moisture content on R _H; (2) combine these effects into separate empirical models for R _TOT and R _H and; (3) use these models to determine temporal trends in R _TOT and R _H and to assess the relative contribution of R _H and R _A to R _TOT. CO₂ fluxes were measured using a vented and thermostatically controlled perspex chamber in conjunction with a portable infrared gas analyser. R _TOT was measured in plots with grass and R _H in plots with bare soil. R _TOT was related to air temperature and R _H to soil temperature using exponential relationships. Both R _TOT and R _H were related to soil moisture content using lognormal relationships. R _TOT was related to leaf area index using a linear relationship. These relationships were combined to produce statistical response functions that explained 87% and 84% of the variation in R _TOT and R _H, respectively. These relationships were combined with meteorological and leaf area index data to reconstruct daily and seasonal fluxes. R _TOT values in wintertime were ∼4 g C m^-2 day^-1 increasing to ∼10 g C m ^-2 day^-1 in summertime when temperatures and leaf area index were higher and soils were drier. R _H has a similar seasonal trend to R _TOT but was consistently lower. Wintertime values were ~2 g C m^-2 day^-1 and increased to ∼5 g C m^-2 day^-1 in summertime. Before day of year 143, and after day of year 259 R _H and R _A represented 62% and 38% of R _TOT, respectively. In the period between these days R _H and R _A both accounted for 50% of R _TOT. In total during 2004 R _TOT, R _H and R _A were 2.34, 1.31 and 1.03 kg C m^-2, respectively.

Original language	English
Pages (from-to)	281-289
Number of pages	9
Journal	Plant and Soil
Volume	282
Issue number	1-2
DOIs	https://doi.org/10.1007/s11104-005-6065-z
Publication status	Published - Apr 2006
Externally published	Yes

Keywords

CO flux
Leaf area index
Lolium perenne
Soil moisture content
Soil temperature

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10.1007/s11104-005-6065-z

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@article{516d3c9414424bc8b8ce27cd8825e3b5,

title = "Partitioning of respiration in an intensively managed grassland",

abstract = "Total (R TOT) and heterotrophic (R H) respiration were measured in an intensively managed perennial ryegrass (Lolium perenne L.) grassland. The overall aim of the study was to partition R TOT into R H and autotrophic respiration (R A). This was achieved as follows: (1) analyse the effect of air temperature, soil moisture content and leaf area index on R TOT and the influence of soil temperature and soil moisture content on R H; (2) combine these effects into separate empirical models for R TOT and R H and; (3) use these models to determine temporal trends in R TOT and R H and to assess the relative contribution of R H and R A to R TOT. CO2 fluxes were measured using a vented and thermostatically controlled perspex chamber in conjunction with a portable infrared gas analyser. R TOT was measured in plots with grass and R H in plots with bare soil. R TOT was related to air temperature and R H to soil temperature using exponential relationships. Both R TOT and R H were related to soil moisture content using lognormal relationships. R TOT was related to leaf area index using a linear relationship. These relationships were combined to produce statistical response functions that explained 87% and 84% of the variation in R TOT and R H, respectively. These relationships were combined with meteorological and leaf area index data to reconstruct daily and seasonal fluxes. R TOT values in wintertime were ∼4 g C m-2 day-1 increasing to ∼10 g C m -2 day-1 in summertime when temperatures and leaf area index were higher and soils were drier. R H has a similar seasonal trend to R TOT but was consistently lower. Wintertime values were ~2 g C m-2 day-1 and increased to ∼5 g C m-2 day-1 in summertime. Before day of year 143, and after day of year 259 R H and R A represented 62% and 38% of R TOT, respectively. In the period between these days R H and R A both accounted for 50% of R TOT. In total during 2004 R TOT, R H and R A were 2.34, 1.31 and 1.03 kg C m-2, respectively.",

keywords = "CO flux, Leaf area index, Lolium perenne, Soil moisture content, Soil temperature",

author = "Byrne, {Kenneth A.} and Ger Kiely",

year = "2006",

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doi = "10.1007/s11104-005-6065-z",

language = "English",

volume = "282",

pages = "281--289",

journal = "Plant and Soil",

issn = "0032-079X",

number = "1-2",

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TY - JOUR

T1 - Partitioning of respiration in an intensively managed grassland

AU - Byrne, Kenneth A.

AU - Kiely, Ger

PY - 2006/4

Y1 - 2006/4

N2 - Total (R TOT) and heterotrophic (R H) respiration were measured in an intensively managed perennial ryegrass (Lolium perenne L.) grassland. The overall aim of the study was to partition R TOT into R H and autotrophic respiration (R A). This was achieved as follows: (1) analyse the effect of air temperature, soil moisture content and leaf area index on R TOT and the influence of soil temperature and soil moisture content on R H; (2) combine these effects into separate empirical models for R TOT and R H and; (3) use these models to determine temporal trends in R TOT and R H and to assess the relative contribution of R H and R A to R TOT. CO2 fluxes were measured using a vented and thermostatically controlled perspex chamber in conjunction with a portable infrared gas analyser. R TOT was measured in plots with grass and R H in plots with bare soil. R TOT was related to air temperature and R H to soil temperature using exponential relationships. Both R TOT and R H were related to soil moisture content using lognormal relationships. R TOT was related to leaf area index using a linear relationship. These relationships were combined to produce statistical response functions that explained 87% and 84% of the variation in R TOT and R H, respectively. These relationships were combined with meteorological and leaf area index data to reconstruct daily and seasonal fluxes. R TOT values in wintertime were ∼4 g C m-2 day-1 increasing to ∼10 g C m -2 day-1 in summertime when temperatures and leaf area index were higher and soils were drier. R H has a similar seasonal trend to R TOT but was consistently lower. Wintertime values were ~2 g C m-2 day-1 and increased to ∼5 g C m-2 day-1 in summertime. Before day of year 143, and after day of year 259 R H and R A represented 62% and 38% of R TOT, respectively. In the period between these days R H and R A both accounted for 50% of R TOT. In total during 2004 R TOT, R H and R A were 2.34, 1.31 and 1.03 kg C m-2, respectively.

AB - Total (R TOT) and heterotrophic (R H) respiration were measured in an intensively managed perennial ryegrass (Lolium perenne L.) grassland. The overall aim of the study was to partition R TOT into R H and autotrophic respiration (R A). This was achieved as follows: (1) analyse the effect of air temperature, soil moisture content and leaf area index on R TOT and the influence of soil temperature and soil moisture content on R H; (2) combine these effects into separate empirical models for R TOT and R H and; (3) use these models to determine temporal trends in R TOT and R H and to assess the relative contribution of R H and R A to R TOT. CO2 fluxes were measured using a vented and thermostatically controlled perspex chamber in conjunction with a portable infrared gas analyser. R TOT was measured in plots with grass and R H in plots with bare soil. R TOT was related to air temperature and R H to soil temperature using exponential relationships. Both R TOT and R H were related to soil moisture content using lognormal relationships. R TOT was related to leaf area index using a linear relationship. These relationships were combined to produce statistical response functions that explained 87% and 84% of the variation in R TOT and R H, respectively. These relationships were combined with meteorological and leaf area index data to reconstruct daily and seasonal fluxes. R TOT values in wintertime were ∼4 g C m-2 day-1 increasing to ∼10 g C m -2 day-1 in summertime when temperatures and leaf area index were higher and soils were drier. R H has a similar seasonal trend to R TOT but was consistently lower. Wintertime values were ~2 g C m-2 day-1 and increased to ∼5 g C m-2 day-1 in summertime. Before day of year 143, and after day of year 259 R H and R A represented 62% and 38% of R TOT, respectively. In the period between these days R H and R A both accounted for 50% of R TOT. In total during 2004 R TOT, R H and R A were 2.34, 1.31 and 1.03 kg C m-2, respectively.

KW - CO flux

KW - Leaf area index

KW - Lolium perenne

KW - Soil moisture content

KW - Soil temperature

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DO - 10.1007/s11104-005-6065-z

M3 - Article

AN - SCOPUS:33745664834

SN - 0032-079X

VL - 282

SP - 281

EP - 289

JO - Plant and Soil

JF - Plant and Soil

IS - 1-2

ER -

Partitioning of respiration in an intensively managed grassland

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Keywords

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