烤烟纯作和套种对烟田土壤温度的影响

The Effect of Monoculture and Inter-cropping on Soil Temperature of Fule-cured Tobacco

研究了纯作和套种对烟田土壤温度变化的影响,结果表明:8:00-19:00,各层土壤温度都随时间推移先升高后下降。5cm处,纯作土壤温度始终高于套种,10cm,15cm和20cm土温,分别在12:00,13:00和14:00之前表现为纯作高于套种,之后,套种高于纯作,两处理土壤温度继续升高,分别在16:00,17:00和18:00升至最高,然后开始下降,套种土壤温度升高和下降幅度均大于纯作,并且套种土壤温度日较差显著大于纯作。总体来说,8:00-19:00,5～20cm土层,套种土壤温度平均值和土壤积温均低于纯作。

The effect of fule-cured tobacco monoculture and inter-cropping with wheat on soil temperature changes was studied. The results showed that the soil temperature rose first, and then fell from 8.00 to 19.00. The soil temperature of monoculture were higher than that of inter-cropping all the time at the depth of 5cm soil. At 10cm,15cm and 20cm soil,the soil temperatures of monoculture were higher than those of inter-cropping, respectively, before 12.00, 13.00 and 14：00,but lower afterward,though the soil temperature of two treatments continued to rise and reached to the highest at 16 ： 00,17 ： 00 and 18 ; 00, respectively. The rising and falling extents of soil temperature were greater in inter-cropping than in monoculture, and the daily temperature differences of interplant were significantly bigger than that of monoculture. The mean and accumulated temperature at 5--20 cm depth were all lower in inter-cropping than in monocuture soil from 8：00 to 19：00.