Abstract:

In order to fix the effect of gene flow of transgenic rise, the author designed a field experiment using isolated cloth’s protection and researched the windspeed distribution in the top of canopy in and out the protected region .The results showed that on the leeward the change law of windspeed in different wind angle of 1 m high seems basally the same, in 1-2.5 H (H meaned the height of isolated cloth, 2 m) windspeed reduction within the region the most, followed 2.5-5 H region, and in the 5-10 H windspeed reduction within the region relatively small; with the wind angle increases, the wind speed decreased slightly lower level. On the windward side, 1 m high windspeed in different wind angle reduced the maximum at 2.5 H, up to 60%-70%. The isolated region as a whole was reduced 1 m high wind speed, windspeed distribution was smaller closer to isolated cloth and larger in the middle of isolated plot. Thus the isolated cloth protection could obviously reduce the windspeed inside and outside the isolate area and effectively reduced the spread of pollen from the transgenic rice.