Pedosphere 5(3): 245--250, 1995
ISSN 1002-0160/CN 32-1315/P
©1995 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Soil air regime of corn field under plastic mulching
CHEN Yong-Xiang, LIU Xiao-Yi and LIU Ming-Guo
Shenyang Agricultural University, Dongling, Shenyang 110161(China)
ABSTRACT
      The effects of plastic mulching on soil aeration at the soil depth of 0-100 cm were studied in a corn field. The results indicated that the CO2 concentration of unmulched soil in the 0-100 cm layer ranged from 0.001 to 0.016 m3/m3, and that of mulched soil 0.002 to 0.018m3/m3, about 32.39% higher than the former on the average. Such a CO2 concentration in the soil air is still suitable for crop growth. The O2 concentration was inversely correlated with CO2 concentration in the soil air (unmulching r=-0.92**, mulching r=-0.79*). O2 concentration ranged from 0.11 to 0.17 m3/m3 in the mulched soil and 0.13 to 0.18 m3/m3 in the unmulched soil. By contrast, N2 concentration in soil air remained relatively steady, with no difference between the two treatments. The relationship between the soil respiratory intensity and the depth of a soil layer appeared to be a power function. At the layer of 0-20 cm, the soil respiration intensity in the mulched soil was obviously higher than that in the unmulched. Plastic mulching could also affect soil structure. In comparison with the unmulched soil, the content of >0.25 mm aggregate and 0.05-0.001 mm microaggregate in the mulched soil was reduced by 82.1% and 35.8%, respectively; the soil total porosity, gaseous phase rate and aeration porosity in the depth of 10-20 cm were reduced by 2.85%, 19.89% and 26.54% respectively, but contrary at the depth of 0-10 cm.
Key Words:  Aeration porosity, plastic mulching, respiratory intensity, soil air
Citation: Chen, Y. X., Liu, X. Y. and Liu, M. G. 1995. Soil air regime of corn field under plastic mulching. Pedosphere. 5(3): 245-250.
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