AAFC Qu©bec City Philippe Rochette, AAFC Qu©bec City Research on gaseous emissions from...

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  • Philippe Rochette, AAFC Qubec CityResearch on gaseous emissions from agricultural soils at the Qubec City AAFC research centre

  • Soil respiration Soil respiration is the sum of several CO2 sources

  • Natural Abundance of 13CAbout 1.1 of atmospheric CO2 is 13CO2 (-8)

    Greater discrimination against 13CO2 by Rubisco than by PEP carboxylase

    More 13C in C4 (-12) than in C3 plants (-26)

  • 1 > Rrh,frac. > 0Rhisophere RespirationRochette and Flanagan,1997; Agron. J. Rochette, Flanagan and Gregorich,1999; Agron. J.C4 plant Rrh = Rtot x Rrh,frac.

  • Contribution of corn-C to soil CO2-10-50510152025303540140160180200220240260280300320DAY OF YEAR10 cm20 cm40 cmRHIZOSPHERE / TOTAL RESPIRATION (%)0>Rrh,frac
  • Separation of soil respiration into corn and native C sourcesRtRrhRs

  • Oxydation de la matire organiqueQ10 = 2

    RESP vs TEMPS PAPIER

    3.39189124.0772160.51840.51840.42674248950.4267424895

    2.34195842.90446560.51476912140.51476912140.29382438210.2938243821

    2.32467842.36882880.42282955960.42282955960.28357799750.2835779975

    4.08983044.4413920.881280.881281.05681701211.0568170121

    4.01569924.5617040.82351239510.82351239511.05482877371.0548287737

    2.96317443.31123680.42978256110.42978256110.47698184830.4769818483

    3.97846083.45332160.21945071620.21945071621.02037490881.0203749088

    4.21908483.35810880.58905983250.58905983251.2675323831.267532383

    4.70257922.79694080.4608185180.4608185180.29249032720.2924903272

    4.64590083.20595840.21892152870.21892152870.72436718470.7243671847

    5.10428161.534847041.21766318121.21766318120.38814894990.3881489499

    5.12835843.91713840.51375095510.51375095510.5548059480.554805948

    4.29337309093.49517454550.69987450430.69987450430.75053736180.7505373618

    4.3398723.33175680.44014397680.44014397680.42118751390.4211875139

    4.42359362.7618840.68390942980.68390942980.10635140160.1063514016

    5.99341090914.08460909091.43897177931.43897177930.79953467080.7995346708

    3.00524727272.01223636360.8302169940.8302169941.11410469461.1141046946

    2.364121.33880727270.24646676810.24646676810.19100316770.1910031677

    1.60149272730.66194181820.13360756280.13360756280.12862982320.1286298232

    1.40625818180.53381454550.29427904320.29427904320.08120841290.0812084129

    MAIZE

    CONTROL

    DAY OF YEAR

    CO2-C EMISSIONS (g C m-2d-1)

    RESP vs TEMPS PAPIER + SOIL C

    3.39189124.0772160.51840.51840.42674248950.42674248953.5795831451

    2.34195842.90446560.51476912140.51476912140.29382438210.29382438212.2753005465

    2.32467842.36882880.42282955960.42282955960.28357799750.28357799752.2325916676

    4.08983044.4413920.881280.881281.05681701211.05681701214.0324824439

    4.01569924.5617040.82351239510.82351239511.05482877371.05482877373.9588454775

    2.96317443.31123680.42978256110.42978256110.47698184830.47698184832.9681738873

    3.97846083.45332160.21945071620.21945071621.02037490881.02037490883.5042966816

    4.21908483.35810880.58905983250.58905983251.2675323831.2675323833.5957546366

    4.70257922.79694080.4608185180.4608185180.29249032720.29249032723.182313169

    4.64590083.20595840.21892152870.21892152870.72436718470.72436718472.8801722169

    5.10428161.534847041.21766318121.21766318120.38814894990.38814894992.7795469296

    5.12835843.91713840.51375095510.51375095510.5548059480.5548059483.0489756

    4.29337309093.49517454550.69987450430.69987450430.75053736180.75053736182.279594662

    4.3398723.33175680.44014397680.44014397680.42118751390.42118751392.3759143732

    4.42359362.7618840.68390942980.68390942980.10635140160.10635140162.5337014986

    5.99341090914.08460909091.43897177931.43897177930.79953467080.79953467083.2070082875

    3.00524727272.01223636360.8302169940.8302169941.11410469461.11410469461.9848697051

    2.364121.33880727270.24646676810.24646676810.19100316770.19100316771.5835806008

    1.60149272730.66194181820.13360756280.13360756280.12862982320.12862982321.3032687478

    1.40625818180.53381454550.29427904320.29427904320.08120841290.08120841291.260701382

    &A

    RESPGRAPH.xls

    CORN

    FALLOW

    SOIL C DECOMPOSITION IN CORN

    DAY OF YEAR

    CO2 EMISSIONS (g m-2d-1)

    RESP vs TEMPS COULEURS

    4.0772163.39189120.51840.51840.42674248950.4267424895

    2.90446562.34195840.51476912140.51476912140.29382438210.2938243821

    2.36882882.32467840.42282955960.42282955960.28357799750.2835779975

    4.4413924.08983040.881280.881281.05681701211.0568170121

    4.5617044.01569920.82351239510.82351239511.05482877371.0548287737

    3.31123682.96317440.42978256110.42978256110.47698184830.4769818483

    3.45332163.97846080.21945071620.21945071621.02037490881.0203749088

    3.35810884.21908480.58905983250.58905983251.2675323831.267532383

    2.79694084.70257920.4608185180.4608185180.29249032720.2924903272

    3.20595844.64590080.21892152870.21892152870.72436718470.7243671847

    1.534847045.10428161.21766318121.21766318120.38814894990.3881489499

    3.91713845.12835840.51375095510.51375095510.5548059480.554805948

    3.49517454554.29337309090.69987450430.69987450430.75053736180.7505373618

    3.33175684.3398720.44014397680.44014397680.42118751390.4211875139

    2.7618844.42359360.68390942980.68390942980.10635140160.1063514016

    4.08460909095.99341090911.43897177931.43897177930.79953467080.7995346708

    2.01223636363.00524727270.8302169940.8302169941.11410469461.1141046946

    1.33880727272.364120.24646676810.24646676810.19100316770.1910031677

    0.66194181821.60149272730.13360756280.13360756280.12862982320.1286298232

    0.53381454551.40625818180.29427904320.29427904320.08120841290.0812084129

    &A

    RESPGRAPH.xls

    FALLOW

    CORN

    DAY OF YEAR

    CO2 EMISSIONS (g m-2 d-1)

    SOIL-SURFACE CO2 EMISSIONS

    RESP total and root 1

    3.39189120.51840.5184-0.1785745809

    2.34195840.51476912140.51476912140.0634198673

    2.32467840.42282955960.42282955960.0876135075

    4.08983040.881280.881280.0737796448

    4.01569920.82351239510.82351239510.0540919839

    2.96317440.42978256110.4297825611-0.0047566312

    3.97846080.21945071620.21945071620.4511310205

    4.21908480.58905983250.58905983250.5930511437

    4.70257920.4608185180.4608185181.4464172623

    4.64590080.21892152870.21892152871.6799561729

    5.10428161.21766318121.21766318122.2118078606

    5.12835840.51375095510.51375095511.9783742553

    4.29337309090.69987450430.69987450431.9159566962

    4.3398720.44014397680.44014397681.868556

    4.42359360.68390942980.68390942981.7980882975

    5.99341090911.43897177931.43897177932.6510497305

    3.00524727270.8302169940.8302169940.9708114881

    2.364120.24646676810.24646676810.74262375

    1.60149272730.13360756280.13360756280.2837373875

    1.40625818180.29427904320.29427904320.1384862015

    &A

    RESPGRAPH.xls

    CORN

    RHIZOSPHERE 13C

    DAY OF YEAR

    CO2 EMISSIONS (g m-2 d-1)

    SOIL-SURFACE CO2 EMISSIONS

    RESP total and root

    3.39189120.51840.5184-0.1785745809

    2.34195840.51476912140.51476912140.0634198673

    2.32467840.42282955960.42282955960.0876135075

    4.08983040.881280.881280.0737796448

    4.01569920.82351239510.82351239510.0540919839

    2.96317440.42978256110.4297825611-0.0047566312

    3.97846080.21945071620.21945071620.4511310205

    4.21908480.58905983250.58905983250.5930511437

    4.70257920.4608185180.4608185181.4464172623

    4.64590080.21892152870.21892152871.6799561729

    5.10428161.21766318121.21766318122.2118078606

    5.12835840.51375095510.51375095511.9783742553

    4.29337309090.69987450430.69987450431.9159566962

    4.3398720.44014397680.44014397681.868556

    4.42359360.68390942980.68390942981.7980882975

    5.99341090911.43897177931.43897177932.6510497305

    3.00524727270.8302169940.8302169940.9708114881

    2.364120.24646676810.24646676810.74262375

    1.60149272730.13360756280.13360756280.2837373875

    1.40625818180.29427904320.29427904320.1384862015

    &A

    RESPGRAPH.xls

    SOIL+RHIZO.

    RHIZOSPHERE 13C

    DAY OF YEAR

    CO2 EMISSIONS (g m-2 d-1)

    RESP total and root & som coul

    3.39189120.51840.5184-0.17857458093.5704657809

    2.34195840.51476912140.51476912140.06341986732.2785385327

    2.32467840.42282955960.42282955960.08761350752.2370648925

    4.08983040.881280.881280.07377964484.0160507552

    4.01569920.82351239510.82351239510.05409198393.9616072161

    2.96317440.42978256110.4297825611-0.00475663122.9679310312

    3.97846080.21945071620.21945071620.45113102053.5273297795

    4.21908480.58905983250.58905983250.59305114373.6260336563

    4.70257920.4608185180.4608185181.44641726233.2561619377

    4.64590080.21892152870.21892152871.67995617292.9659446271

    5.10428161.21766318121.21766318122.21180786062.8924737394

    5.12835840.51375095510.51375095511.97837425533.1499841447

    4.29337309090.69987450430.69987450431.91595669622.3774163947

    4.3398720.44014397680.44014397681.8685562.471316

    4.42359360.68390942980.68390942981.79808829752.6255053025

    5.99341090911.43897177931.43897177932.65104973053.3423611786

    3.00524727270.8302169940.8302169940.97081148812.0344357846

    2.364120.24646676810.24646676810.742623751.62149625

    1.60149272730.13360756280.13360756280.28373738751.3177553398

    1.40625818180.29427904320.29427904320.13848620151.2677719804

    &A

    RESPGRAPH.xls

    CORN

    RHIZOSPHERE 13C

    NATIVE C

    DAY OF YEAR

    CO2 EMISSIONS (g m-2 d-1)

    SOIL-SURFACE CO2 EMISSIONS

    RESP total and root & som papie

    3.39189123.57958314510.5184-0.18769194510.5184-0.6853248

    2.34195842.27530054650.51476912140.06665785350.5147691214-0.5625072