| Experimental study on wind-blown mass affected by stubble height |
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| DOI：10.7606/j.issn.1000-7601.2007.01.07 |
| Key Words: agricultural engineering conservation tillage soil erosion by wind tunnel experiment movable wind erosion tunnel |
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| Abstract: |
| An experimental field of soil wind erosion was established on the farmland in Wuchuan Inner Mongolia to measure the soil loss by wind erosion under different stubble height treatments．A movable wind erosion tunnel and whirl type separation sand sampler designed by Inner Mongolia Agricultural University were used to collect the soil particles during the soil erosion by wind event．The result showed that with increasing wind speed wind—blown mass and height of the particles suspended increased while with increasing stubble height mass and height of the particles suspended decreased．Also the relationship between the mass of the particles suspended in the air and the height fits an exponential function and the majority of the eroded materials moved near the surface．Compared with conventional moldboard plough practice the conservation tillage with 30 cm height stubble could remarkably increase threshold velocity and reduce the soil loss by about 3／4． |