Research On Variation Of Vineyard's Carbon,Water Fluxes And Modeling The Exchange Ofcarbon Flux In Arid Northwestern China

Field ecosystem is an important part of terrestrial ecosystem. Analyzing the variation and controlling mechanism of CO2 flux is meaningful for understanding the carbon cycle of terrestrial ecosystems. In this study, eddy covariance system was used to measure vineyard's CO2 flux in an arid area of northwester China. The results showed that the typical diurnal variation of CO2 flux is a double-peak curve; and there is an obvious carbon sink during the reproductive period. The optimum temperature and stomatal conductance of the grapes were about 20℃and 0.02m·s-1 respectively and the controlling factors for CO2 flux were found by studying the response factors of CO2 flux at different time scales in the vineyard. On Vineyard ecosystems, carbon-water cycle day of the obvious consistency, which is based on the porosity of the two produced a common regulatory mechanism; Moreover, the vineyard ecosystem carbon - water flux exchange, at a certain time Under section has more directly proportional relationship; by analyzing the vineyards and get the time scale of the main factors affecting CO2 flux, based on this, this paper presents a meteorological factors calculated using the exchange of carbon flux vineyard semi-empirical model , and according to this model, the six major grape growth and development of carbon flux during the simulation, with the eddy covariance system measured data compared and analyzed in the simulation of the model before the stage of grape growth better accuracy, overall efficiency is greater than the average analog 0.5, analog value lower than the measured value. In the absence of accurate observation eddy correlation premise equipment, can use the model to simulate the exchange of carbon flux vineyard situation. This work can be a reference for the future study of CO2 cycle in the vineyard.