Study On Wind Control Effect And Surface Breadcrust Physicochemical Properties Of Salix Gordejevii Barreier

The paper chose sand barrier of Salix gordejevii in Daluotuochang of Duolun county in southwest of Otindag sandy land as researching object, studied on the influence of sand barrier on wind control effect and the difference between physicochemical property of breadcrust in sand barrier, the results showed that windproof effect of Salix gordejevii barrier was the best at the height of 20cm at 3 positions both 5m and 8m row spacing, wind speed decreased most observably at the third row of 5m row spacing barrier, and at the first row of 8m row spacing barrier. Under different field velocity, roughness concentration of 5m row spacing was the first row> the second row> the third row, while it was second row> the third row> the first row of 8m row spacing. Wind speed profile followed logarithmic distribution law both of 5m and 8m row spacing.At the bottom of Salix gordejevii barrier of 5m and 8m row spacing, the pH value was bigger than 7, while at the position of 2m away from bottom (CK), pH value was small than 7, meanwhile, the contents of soil organic matter, total N and total P all were higher to CK. Content of quick effective P at the bottom of barrier of both 5m and 8m row spacing was higher to CK, but the content of quick effective N was just the reverse. The content of quick effective N and quick effective P of 8m row spacing were both higher to 5m row spacing.Mechanical composition of breadcrust mainly was sand grain both of the bottom of 5m and 8m row spacing of Salix gordejevii sandbarrier, and contrast with CK, the number of grain which smaller than 0.02mm was increased. Breadcrust organic matter had significant correlation with silt and sand grain of 5m row spacing, total N and total P had a higher negative correlation with silt and sand grain but not significant. Meanwhile, quick effective N was negative correlation with clay particle but nont significant, quick effective P had significant correlation with sand grain and silt. Breadcrust organic matter, total P, quick effective P, quick effective N and pH value all had a negative correlation with sand grain, and along with the thinner of grain, correlation turned to positive, but the correlation of total N with sand grain was just the reverse.