水土保持学报2012，Vol.26Issue(4)：12-16,22,6.
3种机械沙障防风固沙功能的时效性
Timeliness of Reducing Wind and Stabilizing Sand Functions of Three Mechanical Sand Barriers in Arid Region
摘要
Abstract
Based on the indexes of wild observation such as breakage rate, sand transport rate, wind velocity, etc. on three different mechanical salad barriers including wheat straw barriers, clay sand barriers and plastic checkerboard sand barriers located at Minqin Desert Control Experiment Station, effects of wind reducing and sand fixing of these three kinds of sand barriers which were subjected to different times had been studied, the results showed that each kind of barriers had good effects of ecological functions when they had been built at beginning, the wheat straw sand barriers were the greatest effects of reducing wind speed and stabilizing sand among all kinds of barriers, the sand fixing effect of the plastic barriers was followed, and that of the clay sand barriers was the lowest. But, the breakage rate of these barriers increased with the times elapsed. After 6 years past, the average breakage rate of the wheat straw barriers was 53%, the plastic barriers was 50% and the clay sand barriers was 11% meanwhile, the roughness rate of these barriers also obviously decreased with changing of breakage rate, and the sand transport rates occurred at near-surface height of 0~ 20 cm located in the different s~md barriers were varied with changing of sand barriers＇ roughness rate. The roughness rate of wheat straw barriers was the highest in the setting early, but down to the lowest after 6 years, the percentage of compared CK of sand transport rate was increased from 0.11% in 2003 to 44.47% in 2009, respectively the top of clay sand barriers erode severely, its sand transport rate was the same as changing of that of wheat straw barrier, the percentage of compared CK increased with the extension of time from 18.32% to 30.87%. It was indicated that trends of these two barriers were developing from fixed sand dune to moving sand dune. The average of barriers, and its sand transport roughness rate of plastic sand barriers rate was declined from 2.73~ which was the highest among three kinds was compared with CK in year of 2003 to 0.64~ in 2009, it showed that plastic sand barriers had fixed the moving sand dune which of the surface was in a stable state. Above those results, based on some factors such as costs, practical application and value analysis of each kind of sand barriers in 2003 and 2009, it would been inferred a conclusion that the plastic sand barriers had longer service time and better stabilizing sand effect than others, although its cost was higher at early stage construction.关键词
机械沙障/防风固沙/输沙率/时效性/民勤Key words
mechanical sand barrier reducing wind and stabilizing sand sand transport rate timeliness~ Minqin分类
农业科技引用本文复制引用
孙涛,刘虎俊,朱国庆,张莹花,马瑞,满多清..3种机械沙障防风固沙功能的时效性[J].水土保持学报,2012,26(4):12-16,22,6.基金项目
甘肃省科技重大专项 （）
国家自然科学基金项目 （）
