Water and carbon coupled modeling of a vineyard in arid areas in Northwest China

作者：Zhang Yan Qun; Kang Shao Zhong^*; Ding Ri Sheng; Wang Jian Dong

来源：Journal of Hydraulic Engineering, 2013, 44(SUPPL.1): 40-50+56.

• Carbon accumulation
• Dry mass
• Irrigation projects
• MAESTRA
• Radiation transfer
• Sap flow measurements
• Stomatal conductance
• Water use efficiency

Modeling of water and carbon fluxes is essential for optimizing irrigation programs and improving water use efficiency. Parameters for the MAESTRA model applied in vineyards in arid region were determined and canopy radiation transmission and carbon accumulation were simulated. The absorption of PAR is higher in the first 0.4 m layer from the top and 0.1 m layer from the south side of the canopy. The decrease of radiation is dramatically in the lower and north part of the canopy. With sap flow measurements as a benchmark, different stomatal conductance sub-models were compared when modeling the transpiration rate. J-Ref sub-model, with the term of soil moisture limitation and the substitute of reference canopy conductance, could give the best simulation of water use (18.34 mol·vine-1·h-1) comparing to the measurements (17.74 mol·vine-1·h-1) when it was nested to MAESTRA. Modeled carbon assimilation accumulation (1441.0 g) is higher than measurements by only 3.8%. There is a lag between the two accumulation lines, which suggested that the carbohydrates for the sprouting in spring are supplied not by the carbon assimilation of current year but by that of last year. And this storage accounted about 15% of the whole carbon assimilation accumulation. The parameterization of the MAESTRA model in this study would supply an option of the canopy radiation transfer and water and carbon coupled modeling of vineyards in arid regions of Northwest China.

• 出版日期2013
• 单位中国农业大学