Studies On Soil Erosion Monitor And Control Strategy In Bashang Region Of Hebei

Wind erosion-induced desertification not only influence the agricultural production of the region.but also threaten the entironmental quality of the leeward region. Aiming at the ecological environmental deterioration of Bashang, From 2002years to3~5months of 2003 years.sand-transporting quantity of land cover types were on-the-spot moinitoring in gale seaon,comparing the productivity of the main crops.Improving environment and developing economy are compositively considered for applying returning cultivated to woodland and grassland to supply the base of theory and technology.The main results as following:1 Observing the sand transporting quantity of artificial grassland,stubble land and cultivate land.indicates that when wind speed is higher( 8.0m/s),the sand transporting quantity of artificial grassland of 200cm reduces 35.5% in average more than that of cultivate land,34.5% sand-transporting quantity than that of stubble land.no distinct difference between stubble land and cultivate land.and when wind speed is lower( = 5.0m/s),the sand-transporting quantity of coverage is no distinct difference according to the analysis of variance.2 Comparison with the sand transporting rate of cultivate land, cultivate afterward harrowing land and flat bare land indicate that the sand transporting quantity of cultivate land and cultivate afterward harrowing land is separately lower than-flat bare land 88.2% and 66.2%. The earth surface rough degree after mechanical cultivation is important to reduce erosion.3 Analyzing particle size of the wind-blown sediment and surface soil indicate that theformer in 0.02mm-0.2mm occupy about 40% and 55% of sloping field and shoaly land of Bashang, which shows that Bashang is the erosion and desertification region or the latency.4 The search of decreasing effect of wood strap indicates that in lower wind speed the effect is distinct. Afterward wood 2H reduce lower 33.7% than toward wood, 11.4% afterward wood 1 OH, which is distinct. In higher wind speed afterward wood 1 OH is not distinct, which indicate the distance of protecting forest is no more than 10 H.5 Together with the ecological benefit of Returning cultivated to woodland and grassland engineer of Bashang, economical benefit must be considered to succeed in the ecological construction. Comparing with the real productivity of different gross crops the main choice are alfalfa and Astragalus adsurgens.