保护性耕作农田风沙流空间分布规律研究  

Testing and research on space distribution rule of drifting sand flux on farmland with conservative tillage

作　　者：孙悦超[1,2] 麻硕士[1] 陈智[1] 赵永来[2] 

机构地区：[1]内蒙古农业大学机电工程学院,内蒙古呼和浩特010018 [2]内蒙古农业大学职业技术学院,内蒙古包头014109

出　　处：《干旱地区农业研究》2009年第4期180-184,229,共6页Agricultural Research in the Arid Areas

基　　金：高等学校博士学科点专项基金项目(20050129007)

摘　　要：为了解保护性耕作农田风沙流的空间分布规律,对保护性耕作农田进行了野外风洞原位风蚀测试。结果表明:保护性耕作农田在不同风速下各高度的风沙流水平分布符合三次多项式规律,经过27行残茬、5.5 m的水平距离风沙流基本达到了平衡稳定状态;在垂直方向上风沙流分布符合高阶多项式规律,具有与砾石戈壁地表输沙量垂直分布极为相似的"象鼻"效应。试验还发现保护性耕作农田风沙流主要活动在近地表40 cm高度以下范围,占到风蚀物总质量的90%左右。The original position of field wind tunnel was tested in order to make clear the space distribution rule of drifting sand flux on farmland with conservative tillage. The result showed that horizontal distribution in all heights of drifting sand flux on farmland with conservative tillage followed cubic polynomial rule in different wind speed, and drifting sand flux in each height basically reached the balancing and stable state when passed through 27 rows stubble and 5.5 m horizontal distances; drifting sand flux distribution curve in the vertical direction followed higher polynomial rule, and there was ＂trunk＂ domino affect alike the vertical distribution of the ground surface sediment runoff in gravel Gobi. The result also showed that drifting sand flux on farmland with conservative tillage mainly moved bellow 40cm height of the ground surface, about 90 % of all wind erosions.

关 键 词：保护性耕作 风蚀 风沙流 

分 类 号：S157.1[农业科学—土壤学]