Transitional calculation on carbon dioxide flux over agro-ec osystem

Abstract

Abstract: Through simultaneous measuring on photosynthesis rate of a single leaf and CO₂ flux above winter wheat canopy, the results showed that diurnal change of net p hotosynthesis rate was the same as that of canopy CO₂ flux (F_CO₂ abstract Diu rnal change of CO₂ difference was contrary to that of F_CO₂, and while the CO₂ difference was the least, F_CO₂ was the highest. The diurnal c hange of F_CO₂ calculated by aerodynamics and Ac calculated by net photos ynthesis rate were both in the shape of inverted "U", but the diurnal change of Ac fluctuated more smoothly than that of F_CO₂. The daily assimilation quantity calculated by integral method was almost the same as that calculated by aerodynamics in some days, but not in other days because the simulating Ac was only considered light intensity. Actually, other environmental factors such as t emperature, wind speed, and soil moisture would affect canopy CO₂ flux.

CLC Number:

S161.9

ZHANG Yongqiang, LIU Changming, SHEN Yanjun, YU Huning. Transitional calculation on carbon dioxide flux over agro-ec osystem[J]. Chinese Journal of Applied Ecology, 2001, (5): 726-730.

References

[1] Angus DE, Watts PJ. 1984. Evapotranspiration- how good is the bowen rario method?. Agric Water Manage, 8:133～150
[2] Baldocchi DD, Voget CC, Hall B. 1997. Seasonal variation of carbondioxide exchange rates above and below a boreal jack pine forest. AgricFor Meteorol, 83:147～170
[3] Baldocchi D, Valentini R, Running S et ad. 1996. Strategies for measuring and modeling carbon dioxide and water vapor fluxes over terrestrial ecosystems. Global Change Biology, 2:159～168
[4] Conway TJ, Tans PP, Waterman LS et al. 1994. Evidence for interannual variability of the carbon cycle from NOAA/CMDL global sampling network. J Geophysical Res, 99:22831～22855
[5] Dugas WA, Heuer ML, Mayeux HS. 1999. Carbon dioxide fluxes overbermudagrass, native prairie, and sorghum. Agric For Meteorol, 93:121～139
[6] Goulden ML, Munger JW, Fan SM et al. 1996. Measurements of carbon storage by long-term eddy correlation:Methods and a critical evaluation of accuracy. Global Change Biology, 2:169～182
[7] Goundriaan J. 1986. A simple and fast numerical method for the computstion of daily totals of crop photosynthesis. Agri For Meteorol, 38:249～254
[8] Huang Z-B(黄占斌),Shan L(山仑).1999. A study WUE and Pndiurnal change features and its mechanism in crops under different water conditions. Acta Agric Boreali-Sin(华北农学报),14(1):47～52(in Chinese)
[9] Judd MJ, Prendergast PT, McAneney KJ. 1993. Carbon dioxide and latent heat flux measurements in a windbreak-sheltered orchard. AgicFor Meteorol, 66:193～210
[10] Kang L(康乐).1997. Hotspot and advance in research of ecologyand environment science. In:Report on Science development of ChineseAcademy of Sciences. Beijing:Science Press. 30～36 (in Chinese)
[11] Keeling RF, Piper SC, Heimann M. 1996. Global and hemispheric CO₂sinks deduced from changes in atmospheric CO₂ concentration. Nature, 381:218～221
[12] LiuC-M(刘昌明),YuH-N(于沪宁).1997. Water and hear transporton SPAC interface and water dissipation in ecological process. In:LiuGM(刘昌明),Yu H-N(于沪宁)eds.Experimental Study of WaterTransfer of Soil-Crop-Atmosphere System. Beijing:Meteorology Press.1～15(in Chinese)
[13] Paul WL, Bert GD. 1993. Open top chambers for exposing plantcanopies to elevated concentration and for measuring net gas exchange.In:Rozema J, Lambers H, van de Geijn SC eds. CO₂ and Biosphere.Kluwer Academic Publisher. 3～15
[14] Prnitt WO, Morgan DL, Lonrence FJ. 1973. Momentum and masstransfer in the surface boundary layer. Meteorol Soc, 99:370～641
[15] Shangguang Z-P(上官周平).1999. The response of CO₂/H2O exchange parameters of winter wheat leaves under different water controls. Res Soil Water Conser(水土保持研究),(1):107 111(in Chinese)
[16] Sinclair TR, Allen LHJF, Lemon ER. 1975. An analysis of errors in thecalculation of energy flux densities above vegetation by a Bowen ratioprofile method. Boundary-Layer Meteorol, 8:129～139
[17] Steduto P, Hsiao TC. 1998A. Maize canopies under two soil waterregimes I. Diurnal patterns of energy balance, carbon dioxide flux,canopy conductance. Agric For Meteorol, 89:169～184
[18] Stedutop TC. 1998B. Maize canopies under two soil water regimes Ⅱ.Season trends of evapotranspiration, carbon dioxide assimilation andcanopy conductance and as related to leaf area index. Agric For Meteorol, 89:185～200
[19] Yang X-G(杨晓光).Yu H-N(于沪宁).1998. A study on the CO₂flux density and water use efficiency of crop community in a field ecosystem. Progress in Geography(地理学进展),17(4):16～24(inChinese)
[20] YuH-N(于沪宁).1992. A Study on the Carbon Dioxide Flux Concentration and Water Use Efficiency of Crop Community at Field Studybetween Crop and Water. Beijing:Science Press. 1～7(in Chinese)
[21] Yu H-N(于沪宁),Liu X(刘萱),Li J-J(李建京).1992.AStudyonthe CO₂ Flux Density and Water Use Efficiency of Crop Community atField. Beijing:China Science and Technique Press. 1～9(in Chinese)