不同覆盖物对烤烟根温及生长和生理特性的影响

分别以大棚膜、稻草+大棚膜、普通膜、稻草、稻草+遮阳网和遮阳网为覆盖材料，研究覆盖物对烤烟根温以及生长和生理特性的影响.结果表明，各覆盖处理22 d对5和15 cm土壤总积温的影响明显不同，5 cm土壤总积温最高为大棚膜处理（424.75 ℃），最低为稻草+遮阳网处理（378.75 ℃），22 d 的15 cm土壤总积温最高为大棚膜处理（396.75 ℃），最低为遮阳网处理（368.31 ℃）.随着土壤总积温的升高，烟株地上部和地下部干重都呈增长趋势，光合作用增强，根系活力提高；揭膜后第10天烟株根系干重有所增加，普通地膜处理的根系生物量增加最多，稻草+遮阳网处理最少.

Effects of different mulches on rhizosphere temperature, growth, and physiological properties of flue-cured tobacco

With greenhouse plastic film, rice straw plus greenhouse plastic film, soil-mulching plastic film, rice straw, rice straw plus sun-shading net, and sun-shading net as test mulches, this paper studied their effects on the rhizosphere temperature, growth, and physiological properties of flue-cured tobacco. The results showed that after mulching for 22 days, the accumulative rhizosphere temperature at the depth of 5 cm was the highest (424.75 degrees C) for greenhouse plastic film and the lowest (378.75 degrees C) for rice straw plus sun-shading net, while that at the depth of 15 cm was the highest (396.75 degrees C) for greenhouse plastic film and the lowest (368.31 degrees C) for sun-shading net. With the increase of accumulative rhizosphere temperature, the dry weight of above- and underground parts, photosynthesis, and root vigor of flue-cured tobacco tended to increase, and at the 10th day after mulches removal, root biomass had the largest increment in the treatment of soil-mulching plastic film and the smallest increment in the treatment of rice straw plus sun-shading net.