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

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

WEST SIBERIA PEATLANDS TOTAL AREA - 592 440 KM 2 , PEAT STORAGES - 148 PG * CARBON STORAGES - 70 PG C Sheng et al., GBC 2004

MESOOLIGOTROPHIC FEN AT “TIMIRYAZEVSKOE” BOG 4

NEE is the balance between two large fluxes: photosynthesis and ecosystem respiration NEE = ER - GPP ER = AR + HR NPP = GPP - HR 5

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

Li-Cor LI-8100A Raw data processing 7

MOSS (SPHAGNUM FALLAX) SEDGE (CAREX ROSTRATA) DWARF SHRUB (ANDROMEDA POLIFOLIA) 8

CO2 FLUX MEASUREMENTS 22.06.2015 13.07.2015 27.07.2015 11.08.2015 31.08.2015 09.10.2015 LIGHT DARK SHADOW 9

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LINEAR RELATION OF LEAF AREA WITH PLANT DRY MASS S = 123,4 cm 2 , M = 2,7 g 11 11

MEASUREMENT RESULTS (LIGHT CHAMBER - ASSIMILATION) 0 NEE, mol/m 2 /s -4 -8 -12 Moss Sedge DShrub -16 22 Jun 13 Jul 27 Jul 11 Aug 31 Aug 9 Oct 12 12

MODEL NEE(veg) = AR – GPP AR = R 0 × exp(k Ta × T a ) GPP = α·PAR·G m / (α·PAR + G m ) 13 13

RELATIONS WITH ENVIRONMENTAL PARAMETERS AR - Ta GPP - PAR 14 14

MODEL PARAMETERS Parameter Moss Sedge D Shrub AR model 0,020 0,083 0,036 E A 0,131 0,085 0,135 k A R 2 0,89 0,90 0,77 GPP model 0,004 0,009 0,056 α 2,99 10,26 15,18 G m R 2 0,69 0,82 0,88 15 15

AIR TEMPERATURE AND PHOTOSYNTHETICALLY ACTIVE RADIATION 16 16

MODELED GROSS PRIMARY PRODUCTIVITY AND AUTOTROPHIC RESPIRATION AR GPP AR GPP 17 17

TEMPERATURE STATE IMPACT ON PHOTOSYNTHESIS f G (Tst) = (Tst – Tst 0 ) /Tst M , Tst i = Tst Ti-1 + (T ai – Tst Ti-1 )/k st Tst M = 20 o C, Tst 0 = 0 o C. 18 18

VEGETATION FADING AND DYING D G = G2 – G1 + D D; D D = D2 – D1 + D L; D L = L2 – L1 + D M; G – green vegetation; D – dead vegetation; L – litter; D M – litter decomposition. 19 19

NET PRIMARY PRODUCTIVITY NPP = S (GPP(PAR,T) – AR(T) – D(T)) Прирост фитомассы (max) – 254 gC/m 2 Истинный прирост (end) – 83 gC/m 2 20 20

HETEROTROPHIC AND ROOT RESPIRATION HR = f E (T a ) = E 0 × exp(k Ta × T a ) E 0 = 0.063 µмоль × m -2 s -1 ; k Ta = 0.084 К -1 ; 21 21

NET ECOSYSTEM PRODUCTIVITY , NET PRIMARY PRODUCTIVITY , HETEROTROPHIC RESPIRATION HR NPP HR + NPP = 22 22 NEP

DIURNAL VARIATIONS OF NET PRIMARY PRODUCTIVITY AND HETEROTROPHIC RESPIRATION 0,08 0,06 HR, gC/m 2 /hr 0,04 0,02 HR 0 Apr May Jun Jul Aug Sep Oct NPP 23 23

NET ECOSYSTEM PRODUCTIVITY NEP = - 48 гС/м2 (накопление С) NEP NPP 24 24

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СПАСИБО ЗА ВНИМАНИЕ 26 26