EFFECTS OF GRAVEL AND DATE-PALM MULCH ON HEAT MOISTURE AND SALT MOVEMENT IN A DESERT SOIL
The control performance of evaporation from the soil surface and of the soil surface temperature by gravel mulch (GM) and date-palm mulch (DM) was discussed in this paper. A heat, moisture and salt movement experiment was carried out using soil columns in the United Arab Emirates. Elapsed time, when 50% of irrigation water was lost due to evaporation, was remarkably prolonged by mulching, e.g. 2.3 times for the GM and 3.4 times for the DM, respectively, compared with that for bare soil (BS). The daily maximum soil surface temperature was 5.0℃ lower for the DM than the BS, but there was little difference between the GM and the BS. The time rate of salt accumulation near the soil surface was reduced by mulching. For example, the salt mass content of the soil surface, Sc surf for the BS became higher than the initial Sc surf (=0.4%) 48 hours after watering. On the other hand, Sc for the DM was lower than the initial one at the same elapsed time. It was concluded that the reduction of evaporation by mulching with date-palm chips and gravels is effective in delay of the salt accumulation near the soil surface.
gravel mulch date-palm mulch soil surface temperature evaporation salt accumulation
Hiroaki Terasaki Teruyuki Fukuhara Masaki Ito Chao He
Dept.of Architecture and Civil Eng., University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507,Japan Kinki Construction Association, OMM building 13F, Ootemae 1-7-31, Chuoh ward, Osaka, 540-6591,Japan Special researcher of Fukui Univesity, University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507,Japan
国际会议
第16届亚太地区国际水利学大会暨第3届水工水力学国际研讨会(16th IAHR-APD Congress and 3rd Symoposium of IAHR-ISHS)
南京
英文
320-325
2008-10-20（万方平台首次上网日期，不代表论文的发表时间）