Ana lysis of Correction M ethod on Eddy Flux M ea surem en t over Com plex Terra in

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1 (Chinese Journal of Agrometeorology) 2007, 28 (3) : , 2, 1, 1, 1, 3 (11, ; 21 ; 31 ) : CO 2 (NEE),, CO 2 : 1) (DR) ( TR) ( PF), CO 2 ( Fc), : DR < PF < TR Fc,, 2) CO 2 u m s - 1 3) CO 2,W PL,,, ; u 3, : ; ; ; Ana lysis of Correction M ethod on Eddy Flux M ea surem en t over Com plex Terra in W ANG Chun2lin 1, 2, ZHO U Guo2y i 1, W ANG Xu 1, Zhou Chuan2yan 1, Y U Gu i2ru i 3 (1. South China Botanical Garden, CAS, Guangzhou , China; 2. Climate and Agro2meteorological Center of Guangdong Province; 3. Institute of Geographical Science and Natural Resources Research) Abstract:Based on the observation data of the flux measurement in the subtrop ical coniferious and broad2leafed m ixed forest ecosystem in D ing2 hushan, the influence of the typ ical correction method on eddy flux estimates of carbon dioxide was analyzed. The main results were as follows: 1) By using all of the three coordinate system transform ing methods of Double Rotation (DR), Trip le Rotation ( TR) and Planer Fit ( PF), the absolute values of CO 2 flux ( Fc) after terrain correction tended to be smaller than uncorrected values. Sequence order of changed Fc extend was DR < PF < TR. The influence of coordinate transform ing on eddy flux was smaller in daytime than that in nighttime, smaller in winter than that in summer, and smaller above canopy than below canopy. 2) The app rop riate corrected u 3 threshold of Fc below and above canopy were estimated as 0. 05m s - 1 and 0. 2m s - 1 respectively. 3) For the commonly p roblematic issue of underestimation of nighttime CO 2 Eddy flux, W PL correction contributed nothing, while coordinate system transform ing even made further underestimation. The correction of the nighttime storage item ( Fs) increased slightly, but not significantly. The u 3 correction of the nighttime Fc increased significantly, but still lower than thatmeasured by cham2 ber method. N ighttime Eddy flux measurement could be better corrected if chamber measurement was available and combined. Key words: Eddy covariance; Carbon flux; D inghushan; Coniferious and broad2leaved forest., ( FLUXNET) (ChinaFLUX) [ 1 ],, 20% 42% [ 2 ], CO 2 CO 2 [ 324 ], 10% 30% [ 526 ], [ 728 ] CO 2, NEE, [ 9 ] / [ 10 ], [ ] 2,, [ ] ;, [ ],, 3 : : ( 2002CB412501) ; ( KZCX1 - SW A ) ; ( KSCX2 - SW - 120) ; (010567) : (19692),,,, :,, E2mail: wangcl@ grmc. gov1cn

2 234 28,, CO 2, [ 20 ] CO 2 [ 21 ] [ 22 ] ChinaFLUX, [ 20 ], CO 2 ; [ 23 ] [ 10 ], CO 2 (Uu 3 ), Fc LE H s [ 24 ] Chin2 aflux 3,,, ChinaFLUX RMET, 015Hz, 4 ( CR23X - TD /CR10X - TD, CSI) 30m in 113 CO 2 (Net Ecosystem Exchange, NEE) NEE [ 4, 19 ] : w T NEE = (w c ) + c (1 + ) a + c v w + 1 T a z 111 5, 0 5t dz + w 1 r c r - z r z cdz + 0 u 5c dz (1) 0 5x (1) CO, MJ m - 2 a - 1, w c CO, 1433h; 2, (1) 2110, 1, 1210, W PL _H 7, 2810 ; 1956mm, W PL_LE, W PL [ 10, 25 ], T 76% (4-9 ), 10-3 a ( 10-3 ), ( 4-9, v, u v ) (, N, E), 240m, 10, (S ch im a superba), c CO 2 CO 2 Fs, Z CO 2, C CO 2 CO 2 [ ], : Fs = C ( z) / t z, C ( z) z CO 2 (Castanopsis chinensis) ( Pinus m assoniana ), ( [ CO 2 ] t - [ CO 2 ] t2 t ), t ( 1800 s), z 100a, 17m;, 4 :,, ; (27m) [ 28 ] Fs CO 2 [ 29 ],, 30 60cm,, [ CO 2 ] t - [ CO 2 ] t - t > 20mg 80% 90%, 1 3cm, ph m, 2 (Open Path Eddy Covariance, OPEC) (Routine Meteorology, RMET) OPEC 27m, / CO 2 ; OPEC 2m, / OPEC (CSAT3, Campbell Scientific Inc1, USA (CSI) ), ( FW 05, CSI), CO 2 /H 2 O ( IRGA) (L i , L icor Inc, USA ) CO 2 /H 2 O 10Hz, (CR5000, CSI) 10Hz, 30m in CO 2 ( Fc) (LE ) (H s) Fc LE H s [ 25 ] m - 3, Fs 013mg m - 2 s - 1 F va F ha 2, [ ], F va F ha, 0, [ 33 ],,,,

3 3 : 235, [ 19, 30 ] 2 (Double Rotatation, DR ) 3 ( Trip le Rotation, TR ) ( Planner Fit, PF),, [ 24, ], CO 2 [ 19, 30 ],, CO 2 u 3, u 3, u 3 CO W PL, W PL CO 2, 5 [ 10 ] W PL CO 2 (W PL_LE) (W PL_H ) ( Fc_ irga), ( 1, a - b), W PL_H W PL _LE, W PL _H W PL _ LE 6, 3 W PL CO 2 ( 2, a - b), W PL CO 2 42% CO 2 W PL 0 ( 1, a),,,w PL CO 2 0 ( 1, b), 1 CO 2 W PL ( Fc_ irga: CO 2 ;W PL _L E: ; W PL _ H: ; Fc _W PL : CO 2 ) [ ( a ) ( ), ( b) ( ), ( c) ( ), ( d) ( ) ] CO 2 ( 1, c - d) W PL,,W PL CO 2 ( 2, c - d) CO 2, ( 1, d),,

4 W PL ( Fc_ irga) ( Fc_W PL ) CO 2 [ ( a ), ; ( b), ; ( c), ; ( d), 1 ] 212 CO 2 CO 2 ( Fs) 3 CO 2, CO 2, Fs 0;, Fs 0 Fs mg m - 2 s - 1, Fs 0, CO 2 Fs ( 3), CO 2 ( 645mg m - 3 ) ( 604mg m - 3 ) 41mg m - 3 Fs u 3 [ 36 ],,, Fs ( 4) 3 CO 2 Fs 213 CO 2, 2 (DR ) 3 ( TR) ( PF), W PL CO 2 Fc _wp l CO 2 Fc_DR Fc_TR Fc_PF, Fc_DR TR Fc_ PF ( y), Fc _W PL ( x), : y = kx, ( k) 1 2 k 1, 3 CO 2, k,,,

5 3 : 237,, 3 CO 2 ( ) DR CO 2 DR k ( ), PF ( ), TR k ( ) ; R 2 3 CO 2 : DR < PF < TR, DR CO 2, ; PF TD CO 2,,,,,, CO 2 4 CO 2,, 3 Fs u 3 1 ( 27m ) CO 2 DR k R 2 TR k R 2 PF k R 2 n ( ) ( ) : ; , 2 2 ( 2m ) CO 2 DR k R 2 TR k R 2 PF k R 2 n ( ) ( ) u CO 2 u 3 CO 2 ( Fcb) 2m ( u 3 < 013m s - 1 ), Fcb u 3 ( 5 6), u 3, Fcb u 3 ( 5), [ 19, 23 ], Fcb u 3, u 3 014m s - 1, Fcb, [ 23 ],, u 3 014m s - 1,, ChinaFLUX 012m s - 1 u 3, u 3 012m s - 1, m s - 1 Fcb u 3, 0105m s - 1 u 3 u 3, 2003 Fcb mg m - 2 s - 1, 10%, - [ 37 ] (0111mg m 22 s 21 ) 37% CO 2 u 3 u 3 012m s - 1,, u 3 CO 2 ( Fca) (Reco), u 3 < 013m s - 1, Fca u 3 ( 7) ; u m s - 1, Fca u 3 ( ), [ 19, 23 ] u 3 > 016m s - 1,,, Fca u 3

6 CO 2 Fcb( ) ( ) ( u 3 ) ( 0105m s - 1 u 3, , 0, , 0105, , , : ) 6 CO 2 Fcb( ) ( ) u 3 ( u 3 5) 7 CO 2 Fca ( ) ( ) u 3 ( u , , ) 3 u 3 CO 2 ( Fca) ( N) u 3 ( ) ( ) (2003) (m s - 1 ) Fca N ( % ) Fca N ( % ) Fca N ( % )

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