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Research on Variation of Vineyard’s Carbon、Water Fluxes and Modeling the Exchange Ofcarbon Flux in Arid Northwestern China

Author: GuoWeiHua
Tutor: KangShaoZhong
School: Northwest University of Science and Technology
Course: Agricultural Soil and Water Engineering
Keywords: Northwest Arid Area Vineyard Water and carbon Eddy covariance Carbon flux simulation
CLC: S663.1
Type: Master's thesis
Year: 2010
Downloads: 186
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Abstract


Farmland ecosystem is an important part of the terrestrial ecosystem , has important implications for understanding the material cycle of terrestrial ecosystems to study carbon and water cycle variation and control mechanism . In this study, the use of eddy covariance system , a growth quarter observations of Northwest China Arid Regions Wuwei City Wong Toi winery vineyard , the different time scales CO2 flux variation : vineyards typical diurnal variation of CO2 flux was bimodal curve ; through the the carbon sequestration amount calculated in different months vineyard , indicating that the growth period is an obvious carbon sinks ; analysis of the different time scales of response pattern of the vineyards CO2 flux of each factor , the results show that the grapes the optimum growth temperature is 20 ℃ , the optimum stomatal conductance of about 0.02 m · s-1 . Monitoring data using the eddy covariance system explore the the vineyard water carbon flux coupling relationship , results show that the the vineyard water carbon flux changes during the day and has a more obvious consistency , which is based on the co- regulation of stomata on both mechanisms ; vineyard water carbon flux in a certain time period , with a significant positive correlation between . Vineyard time scale analysis under the influence of CO2 flux factor a meteorological factors and stomatal conductance projected semi-empirical model of carbon fluxes , and in accordance with this model of grape growth and development of the five important carbon flux during the simulation , comparative analysis of the measured data with eddy covariance system , draw the model has better accuracy in the simulation of the previous stage of the grape , the overall average the simulation efficiency greater than 0.5 , the analog value than the measured value is low , under the premise of the lack of the related vorticity accurate observation instruments , we can use this model to simulate carbon flux vineyards . The above studies reveal the vineyards carbon flux variation reference, and laid the foundation for further study of the simulation model of the carbon fluxes in the water carbon flux coupling between spatial scale and time .

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CLC: > Agricultural Sciences > Gardening > Fruit trees gardening > Berries > Grapes
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