Relationship of Carbon Flux with Photosynthesis Characteristics and Main Environmental Factors in Maize Agri-ecosystem

doi:10.7668/hbnxb.2015.03.021

Abstract

Abstract: In order to estimate the yield and net productivity of summer corn,using eddy tower system,we investigated single-leaf net photosynthesis (Pn) and canopy apparent photosynthesis (CAP) of summer maize in different stages,and studied the relationship of carbon flux with crop photosynthesis and main environmental factors in the maize agri-ecosystem in North China Plain.The results showed that there was a positive correlation between Fc and CAP in maize field,their average correlation coefficient was 0.910.The diurnal accumulation of Fc and CAP reached maximum value in heading stage.We get a curve-equation with the regression analyzing Pn·LAI to Fc,the trendline of equation and real value had a perfect superposition and the correlation-coefficient was significantly 0.790.The Full-Path Analyse of different environment factors to Fc reveal that the decision-coefficient and proportion of the hydrosphere press in atmosphere were maximal,posteriorly H₂O concentration,Pn·LAI,photosynthetically active radiation and CO₂ concentration.Leaf transpiration have significant coupling-effect to Fc.

Key words: Summer maize, CO₂ flux, Photosynthetic characteristics, Environment factors

CLC Number:

S513.01

WANG Zhi-qiang, WANG Jun-zhe, XIN Ze-yu, QU Yi-wei, LIN Tong-bao. Relationship of Carbon Flux with Photosynthesis Characteristics and Main Environmental Factors in Maize Agri-ecosystem[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2015, 30(3): 117-122. doi: 10.7668/hbnxb.2015.03.021.

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