Soil evaporation under perforated plastic mulch

Chinese Journal of Applied Ecology ›› 2005, Vol. 16 ›› Issue (3): 445-449.

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Soil evaporation under perforated plastic mulch

LI Yi^1,3, WANG Quanjiu^3,4, WANG Wenyan⁴, SHAO Ming'an^2,3

1. College of Life and Grographical Science, Qinghai Normal University, Xining 810008, China;
2. Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;
3. Institute of Water and Soil Conservation, Chinese Academy of Sciences, Yangling 712100, China;
4. Institute of Water Resources in Xi'an University of Technology, Xi'an 710048, China

Received:2003-10-23 Revised:2004-10-28 Online:2005-03-15 Published:2005-03-15

Abstract

Abstract: In arid and semiarid regions of northwestern China,where evaporation exceeds precipitation,perforated plastic mulches are widely used to decrease soil water evaporation.To determine the effects of various perforated plastic mulches on soil water evaporation after irrigation,a soil column experiment was conducted,which consisted of six mulches with different perforated rates and four levels of irrigation,and the soil water evaporation from each soil column was measured.The results showed that with 100% perforated mulch,the cumulative evaporation was 2 8～48.5 times higher than that of the control,and increased with increasing irrigation amount.There was a linear relationship between cumulative evaporation and time,which followed the Gardner's theory of bare soil evaporation.A three factor (evaporation time,perforated rate and irrigation amount) function of cumulative evaporation and the functions of relative cumulative evaporation and cumulative evaporation per unit hole area film were established,which fitted the observed data very well.

Key words: Open holes ratio of plastic mulch, Cumulative evaporation, Perforated rate

CLC Number:

S152.7

LI Yi, WANG Quanjiu, WANG Wenyan, SHAO Ming'an. Soil evaporation under perforated plastic mulch[J]. Chinese Journal of Applied Ecology, 2005, 16(3): 445-449.

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Soil evaporation under perforated plastic mulch

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