Abstract:
【Objective】 Explore the effects of different covering materials on soil environment of oasis apple orchard, to provides a reference for the scientific application of ground covering materials.
【Methods】 The single factor experiment design was adopted to compare the differences of soil environment by setted six covering treatments: non-woven fabric, polypropylene non-woven fabric, polyethylene woven fabric, tarpaulin covering, white and black plastic film.
【Results】 The coverage of weeds could be reduced to less than 10% by ground covering, but there were more weeds in non-woven fabrics. The peak temperature of the surface layer of the control soil appeared at 18 o'clock and that of the deep layer at 24 o'clock. The peak time did not change significantly after the covering material was laid. The diurnal temperature range of soil surface layer and deep layer of black film was 17.36℃ and 5.66℃ respectively, which were higher than that of the control. The soil temperature and diurnal range were decreased by ground cloth, and increased by plastic film. The soil peak temperature of plastic film was 2.1 ~ 5.3℃ higher than that of control. Soil moisture was the highest at 17:00 p.m., and there was no significant difference in soil daily average moisture, soil alkalinity and salt content between the control and treatments. There was a significant positive correlation between soil temperature and soil moisture, and a significant positive correlation between soil moisture and pH, but a significant negative correlation between soil moisture and salt content. Compared with the control, the correlation between the indexes was decreased by ground cloth, but increased by plastic film covering.
【Conclusion】 Ground cover had a significant effect on the peak value of soil temperature and moisture, but had no significant effect on the mean value. The surface soil pH and salt content were significantly affected by ground cover, but not by deep soil. The influence of plastic film on soil environment is the strongest, and it has obvious effect of warming and moisturizing.