Analysis In Benefit System Of Sand Hazared Control Of Kubuqi Desert Irrigated Farmland

We investigated the irrigated forest shelter belt,farmland shelter belt and internal wind erosion prevention technology in KuBuQi desert in order to analyze the anti-wind effect they had.We analyzed the anti-wind effect of forest shelter belt under different configuration,the vegetation recovery condition of different distance belt,the anti-wind effect of irrigated farmland shelter belt and forest network,and the anti-wind effect of different stubble height.The results showed:(1)The main factors that influence the anti-wind effect were forest species,configuration,belts distance,belts numbers and so on.There was a difference of anti-wind effect between Caragana microphylla and Salix cheilophila.The forests under banding collocate had a accumulated anti-wind effect.The effect reached a balance after four belts.The anti-wind effect of belt scheme was better than the random scheme.When the belt distance increased,the anti-wind effect went down,and vegetation went well.(2)The forest belts of different structures had obviously different anti-wind effect.The sparse forest belt was17.64%,the ventilation forest belt was 13.13%,the intensive forest belt was 12.31%.The forest belts of different belts had significantly difference,the effect of 7m,11m,14m forests are respectively 13.71%?16.05%?18.33%.As the shelter belts height increased,the effect increased positively.The angle between belts and wind direction showed a sinusoidal function relationship with anti-wind effect.When the angle was 90°,the effect was the best.When the angle was less than30 °,the effect was nearly zero.The anti-wind effect of farmland shelter network could be accumulated.(4)The farmland stubble could significantly changed the 0-20cm wind structure above ground,increased 10?20%anti-wind effect,decreased 11?41%sediment discharge.Stubble on the farmland could protect it from sand hazard,decrease 3?7 times of the wind erosion near the ground.As the stubble height increased,the anti-wind effect increased.Besides,stubble height could protect the soil fine particle,maintain the soil fractal dimension.