风速和秸秆覆盖对土壤水分蒸发影响的模拟试验研究

李晓明; 王飞; 胡林; 穆兴民

Impact of wind-speed and straw-mulching on soil water evaporation

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DOI：10.7606/j.issn.1000-7601.2011.03.35

Key Words: soil water evaporation straw-mulching wind arid and semi arid region

Author Name	Affiliation
LI Xiaoming	College of Resources and Environment，Northwest A & F University， Yangling， Shaarnxi 712100， China
WANG Fei	College of Resources and Environment，Northwest A & F University， Yangling， Shaarnxi 712100， China Institute of Soil and Water Conseroation， Chinese Academy of Sciences &. Ministry of Water Resources， Yangling， Shaanxi 712100，China
HU Lin	College of Resources and Environment，Northwest A & F University， Yangling， Shaarnxi 712100， China
MU Xingmin	College of Resources and Environment，Northwest A & F University， Yangling， Shaarnxi 712100， China Institute of Soil and Water Conseroation， Chinese Academy of Sciences &. Ministry of Water Resources， Yangling， Shaanxi 712100，China

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Abstract:

The impacts of wind-speed and straw-mulching on soil water evaporation were measured and analyzed with 9 treatments of three wind-speeds (calm wind，0.5 or 1.5 m/s) and three straw-mulching levels (0，4 120， or 8 240 kg/ hm²). The results showed that when the water content was 70% of the field moisture capacity and mulching (0, 4 120kg/hm²) was the same， the soil water evaporation with wind-speed 1.5 m/s was significantly higher than other treatments; when the water content was higher than 55% of the field moisture capacity，the cumulative soil water evapo-ration with no mulching and wind-speed 1.5 m/s was far more than that of other treatments. There lies an exponential relationship between the cumulative soil water evaporation (E) and time (t) (E=atb)， and the parameters (a and b) have clear differences among the treatments of wind-speed and straw mulching levels.