| Effect of straw mulching on soil temperature before the greening stage of winter wheat in dryland |
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| DOI：10.7606/j.issn.1000-7601.2007.04.38 |
| Key Words: dryland winter wheat straw mulching soil temperatu |
| Author Name | Affiliation | | LIU Wei | College of Resources and Environmental Science, Northwest A & F University, Yangling, Shaanxi 712100 | | GAO Ya-jun | College of Resources and Environmental Science, Northwest A & F University, Yangling, Shaanxi 712100 | | YANG Jun-lin | College of Resources and Environmental Science, Northwest A & F University, Yangling, Shaanxi 712100 | | YANG Xue-yun | College of Resources and Environmental Science, Northwest A & F University, Yangling, Shaanxi 712100 | | LI Sheng-xiu | College of Resources and Environmental Science, Northwest A & F University, Yangling, Shaanxi 712100 |
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| Abstract: |
| Field experiment was conducted to investigate the effect of straw mulching on soil temperature in Yangling. Mini temperature data loggers were used to record the temperature at the depth of 10 cm and 20 cm in straw mulched soil and no mulch soil every 1 hour before the turning green stage of wheat. The results showed that the average soil temperature of 24 hours in a day was significantly higher in the mulched soil than that in the soil without mulching before winter period(Nov.21～Dec.20) and during early winter period(Dec.21～Jan.20). The temperature at the depth of 10 cm in the straw mulched soil was a little bit lower than that in the soil without mulching at 13 pm to 17 pm before winter period and during early winter period. However, it was higher than that in the soil without mulching during the rest time of a day. During late winter period, the temperature at the depth of 10 cm in the straw mulched soil was a little bit lower than that in the soil without mulching at 12 pm to 23 pm, but it was higher than that in the soil without mulching during the rest time of a day. The temperature at the depth of 20 cm in the straw mulched soil was higher than that in the soil without mulching in 24 hours before winter period and the early winter period. The maximum difference of temperature between the straw mulched soil and the soil without mulching was found at 8 am to 10 am. The average temperature of 24 hours in a day was significantly higher at the soil depth of 20 cm than 10 cm for both of straw mulching treatment and no mulch treatment. The average soil temperature difference between 20 cm and 10 cm in a day was significantly lower in the straw mulched soil than in the soil without mulching before winter period, but it was slightly higher than in the latter during winter period of wheat. Straw mulching reduced remarkably the variation range of soil temperature, and also lowered the velocity of soil temperature increase from Minimum to Maximum and soil temperature decrease form Maximum to Minimum in a day. |
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