The long-term variation characteristics of annual mean air temperature, annual mean maximum and minimum air temperature and mean daily range from 1932 to 2002 in Lanzhou are analyzed.

分析了兰州1932～ 2 0 0 2年年平均气温、年平均最高和最低气温及年平均气温日较差的气候变化特征。

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The experiment results showed that the daily maximum and daily mean value of soil temperature were decreased, the daily minimum of soil temperature was increased in comparison with control.

实验结果表明，有机物覆盖使土壤的日最高温度和日平均温度降低，但却使土壤的日最低温度得以提高。

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