E.A. Dyukarev, E.A. Golovatskaya Institute of monitoring of climatic - - PowerPoint PPT Presentation

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E.A. Dyukarev, E.A. Golovatskaya Institute of monitoring of climatic - - PowerPoint PPT Presentation

Nov 17, 2023 433 likes •718 views

SHORT-TERM VARIATIONS IN CARBON EXCHANGE AT PEATLAND VEGETATION IN WEST SIBERIA ESTIMATED USING AUTOMATIC CHAMBER MEASUREMENTS AND MATHEMATICAL MODELLING E.A. Dyukarev, E.A. Golovatskaya Institute of monitoring of climatic and ecological

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SHORT-TERM VARIATIONS IN CARBON EXCHANGE AT PEATLAND VEGETATION IN WEST SIBERIA ESTIMATED USING AUTOMATIC CHAMBER MEASUREMENTS AND MATHEMATICAL MODELLING

E.A. Dyukarev, E.A. Golovatskaya

Institute of monitoring of climatic and ecological system SB RAS

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WEST SIBERIA PEATLANDS TOTAL AREA

  • 592 440 KM2,

PEAT STORAGES

  • 148 PG

CARBON STORAGES

  • 70 PG C

Sheng et al., GBC 2004

*

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MESOOLIGOTROPHIC FEN AT “TIMIRYAZEVSKOE” BOG

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NEE is the balance between two large fluxes: photosynthesis and ecosystem respiration

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NEE = ER - GPP ER = AR + HR NPP = GPP - HR

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Automated soil flux sustem Li-Cor LI-8100А with transparent chamber

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Li-Cor LI-8100A Raw data processing

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MOSS (SPHAGNUM FALLAX) SEDGE (CAREX ROSTRATA) DWARF SHRUB (ANDROMEDA POLIFOLIA)

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CO2 FLUX MEASUREMENTS

22.06.2015 13.07.2015 27.07.2015 11.08.2015 31.08.2015 09.10.2015

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LIGHT DARK SHADOW

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LINEAR RELATION OF LEAF AREA WITH PLANT DRY MASS

11 11 S = 123,4 cm2, M = 2,7 g

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MEASUREMENT RESULTS (LIGHT CHAMBER - ASSIMILATION)

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  • 16
  • 12
  • 8
  • 4

NEE, mol/m2/s Moss Sedge DShrub 22 Jun 13 Jul 27 Jul 11 Aug 31 Aug 9 Oct

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MODEL

NEE(veg) = AR – GPP AR = R0×exp(kTa×Ta) GPP = α·PAR·Gm / (α·PAR + Gm)

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RELATIONS WITH ENVIRONMENTAL PARAMETERS

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AR - Ta GPP - PAR

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MODEL PARAMETERS

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Parameter Moss Sedge D Shrub AR model EA 0,020 0,083 0,036 kA 0,131 0,085 0,135 R2 0,89 0,90 0,77 GPP model α 0,004 0,009 0,056 Gm 2,99 10,26 15,18 R2 0,69 0,82 0,88

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AIR TEMPERATURE AND PHOTOSYNTHETICALLY ACTIVE RADIATION

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MODELED GROSS PRIMARY PRODUCTIVITY AND AUTOTROPHIC RESPIRATION

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AR GPP AR GPP

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TEMPERATURE STATE IMPACT ON PHOTOSYNTHESIS

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fG(Tst) = (Tst – Tst0) /TstM, Tsti = TstTi-1 + (Tai – TstTi-1)/kst TstM = 20 oC, Tst0 = 0 oC.

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VEGETATION FADING AND DYING

DG = G2 – G1 + DD; DD = D2 – D1 + DL; DL = L2 – L1 + DM; G – green vegetation; D – dead vegetation; L – litter; D M – litter decomposition.

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NET PRIMARY PRODUCTIVITY

NPP = S (GPP(PAR,T) – AR(T) – D(T))

20 20 Прирост фитомассы (max) – 254 gC/m2 Истинный прирост (end) – 83 gC/m2

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HETEROTROPHIC AND ROOT RESPIRATION

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HR = fE(Ta) = E0×exp(kTa×Ta) E0 = 0.063 µмоль×m-2s-1; kTa = 0.084 К-1;

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NET ECOSYSTEM PRODUCTIVITY , NET PRIMARY PRODUCTIVITY , HETEROTROPHIC RESPIRATION

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HR NPP

HR + NPP = NEP

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DIURNAL VARIATIONS OF NET PRIMARY PRODUCTIVITY AND HETEROTROPHIC RESPIRATION

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0,02 0,04 0,06 0,08 HR, gC/m2/hr

Apr May Jun Jul Aug Sep Oct

HR NPP

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NET ECOSYSTEM PRODUCTIVITY

NEP = - 48 гС/м2 (накопление С)

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NEP NPP

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СПАСИБО ЗА ВНИМАНИЕ

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