中文摘要：

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22d对5和15cm土壤总积温的影响明显不同，5cm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℃）。22d的15cm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境增加最多，稻草＋遮阳网处理最少．

英文摘要：

With greenhouse plastic film, rice straw plus greenhouse plastic fihn, soil-mulching plastic film, rice straw, rice straw plus sun-shading net, and sun-shadlng 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 ℃ ） for greenhouse plastic film and the lowest （378.75 ℃ ） for rice straw plus sun-shading net, while that at the depth of 15 cm was the highest （396. 75 ℃ ） for greenhouse plastic film and the lowest （368. 31 ℃ ） for sunshading net. With the increase of accumulative rhizosphere temperature, the dry weight of above- and underground pans, 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.