Crop photosynthesis and the flux of carbon dioxide below the canopy.

Published online
18 Jan 1965
Content type
Journal article
Journal title
Journal of Applied Ecology

Monteith, J. L. & Szeicz, G. & Yabuki, K.

Publication language


Bare soil evolved a maximum of 7 g CO3/m2/day in summer and a minimum of 1 g/m2/day in winter; the Q10 was 3. Root respiration, i.e. the difference in CO2-flux between fallow and cropped soil, was usually about 1-3 g/ma/day. The amount of soil C assimilated by crops was about 6% of net C uptake for rapidly growing grass in spring and about 20% for other crops (kale, barley) in summer. Release of C from the soil was 0-4 kg/m2/yr and the half-life of soil organic matter was 22 years. In most weather, photosynthesis was independent of soil CO2 flux. F. s.-R.B.

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