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土壤圈(英文版). 1995, (03)

Soil Air Regime of Corn Field Under Plastic MnlchingEnglish Full Text

CHEN YONG-XIANG; LIU XIAO-YI and LIU MING-GUO(Shenyang Agricultural University, Dongling, Shenyang 110161 (China)

Abstract: The effects of plastic inulching on soil aeralion at the soil dcpth uf 0-100 cm were studied in a corn tield.The resnlts indicated that the CO2 concentration of unmulched soil in the 0-100 cm layer layer ranged from 0.00 1to 0.016 m￣3/m￣3, and that of mulched soil 0.002 to 0.018m￣3/m￣3, about 32.39% higher than the forrner on theaverage. Such a CO2 concentration in the soil air is still suitable for crop growth. The O2 concentration wasinversely correlated with CO2 concentrat ion in the soil air （ unmulching r=-0.92￣（**）, mulching r=-0. 79￣*）. O2concentration ranged from 0. 1 1 to 0. 17 m￣3/m￣3 in the mulched soil and 0. 1 3 to 0. 18 m￣3 /m￣3 in the unmulchedsoil. By contrast, N2 concentration in soil air remained relatively steady, with no difference between the twotreatments. The relationship between the soil respiratory intensity and the depth of a soil layer appeared tobe a power function. At the layer of 0-20 cm, the soil respiration intensity in the mulched soil was obviouslyhigher than that in the unmulched. Plastic mulching could also affect soil structure. In comparison withthe 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 aerationporosity 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.
Keywords：

Aeration porosity; plastic mulching; respiratory intensity; soil air;

  • Series：

    (D) Agriculture

  • Subject：

    Crop

  • Classification Code：

    S513.06

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