摘要
通过对宁夏北部1961—2000年沙尘暴和自然环境状况的调查分析,发现该区域地形、地貌和沙源地分布的不同是沙尘暴地域分布不均的主要原因,同时还发现当地沙尘暴的减少趋势与不同年代特有的气候因素有关外,还与人为活动有着直接关系。进入20世纪90年代,该区域通过加大植树造林和防护林带建设规模,有效地遏制了土地荒漠化,使沙地面积有所缩小,在大风次数正常偏多的情况下,沙尘暴却明显减少,起沙的风速阈值呈增大趋势,说明人为改变下垫面的自然环境,使其良性发展,有效地增加地表粗糙度,对抑制区域性沙尘暴的出现是可行的,并由此提出了防治沙尘暴应着眼于环境治理和保护的对策建议。
We have investigated and analyzed the situation about sandstorm happing from 1961 to 2000 and natural environment in northern Ningxia. It was revealed that the spatial distribution of sandstorm weather was mainly influenced by regional terrain, geomorphology and sand-source; the declining trend of sandstorm weather in study region had direct relation with human activities besides with the climate characters of different decade. After 1990 the desertification was controlled and the sandlot shrank in northern Ningxia as effect of increasing afforesting and constituting forest shelter belts. Even if the gale times kept normal or even a little stronger, the present situation of sandstorm decreasing and the threshold of sand-blowing wind increasing indicated that artificially modifying the surface environment and making the surface coarseness increase are effective to restrain local sandstorm. So, the key countermeasures for controlling sandstorm are environmental management and protection.
出处
《中国沙漠》
CSCD
北大核心
2006年第3期375-379,共5页
Journal of Desert Research
基金
国家科技部项目"宁夏气候对全球气候变化的响应及其机制"(2004DIB3J121)
国家自然科学基金(40575048)资助
关键词
自然环境
沙尘暴
影响
对策建议
natural environment
sandstorm
influence
countermeasure and suggestion
