干旱区生态环境知识资源中心(Arid): 民勤绿洲边缘带灌丛沙丘防风作用研究

Arid

	民勤绿洲边缘带灌丛沙丘防风作用研究
其他题名	Wind-protecting Effect of Shrub Dunes in Ecotone of Minqin Oasis
	王升堂 1; 邹学勇 2; 张春来 2; 程宏 2
ISSN	1000-0690
出版年	2007
卷号	27 期号:1 页码:104-108
中文摘要	对民勤天然绿洲边缘带的固定、半固定及半流动风速灌丛沙丘实地观测表明，气流通过单个固定灌丛沙丘时，近地面平均风速降低4.4％，在965 m观测样线内降低57％，且风是连续降低的，愈靠近内侧降低得愈多，到绿洲内部农田边缘处时，平均风速仅有对照点的21％。深入了解灌丛沙丘对绿洲的防护机理，对于合理保护和恢复绿洲边缘带灌丛沙丘，避免绿洲遭受风沙侵袭具有重要意义。
英文摘要	The belt of oasis border is usually called as ecotone of desert and oasis, which is mainly composed of shrub dunes. These shrub dunes can be divided into stable dune, semi-stable dune, semi-shift dune and shift dune by coverage of vegetation. A lot of studies have indicated that these shrub dunes are nature roughness unit and they have significant roles on airflow near land surface. They can change airflow structure and interchange of air torrent at boundary layer near land surface. They can also increase resistance of land surface to moving airflow by enhancing aerodynamic roughness length. When airflow blow passed shrub dunes, wind speed will be decreased remarkably because the dunes resist wind. So, shrub dunes in ecotone are very important defending barrier to nature oasis. This research selected a sample line （965m） mainly composed of stable dune, semi-stable dune and semi-shift dune in ecotone of Minqing oasis and one of stable shrub dune as study object. Field observation results indicate that mean wind speed at layers near land surface decrease 4.4% through the sample stable shrub dune and decrease 57% through the sample line. The mean wind velocity is reduced continuously along the sample line. At the edge of cropland inner of oasis, the wind velocity is only 21% referring to reference observation point. But shrub dunes in ecotone of oasis are one kind of the most vulnerable and unstable ecosystem and they are easily vulnerable to become degeneration ecosystem so as to threaten the sustainable development of oasis. The evolutions of shrub dunes are mainly influenced by human activities and climate changes. If they degenerate to be shift dunes, they will change from shelter barrier to be dust bowl. So, attention should be paid not only to the inner but also to the outer of oasis about its protection. Shrub and grass belts should be built in the surroundings while windbreak grid built in the inner and base windbreak built at the edge of oasis. Water is the most important factor to the stableness of the ecotone. It is significant for the sustainable development of oasis to supply sufficient ecological water utilized to realize the stableness of the belts of oasis border, at the same time, all kinds of human destruction activities should be forbidden.
中文关键词	绿洲边缘带 ; 灌丛沙丘 ; 天然粗糙元 ; 降低风速
英文关键词	ecotone of desert and oasis shrub dunes nature roughness unit reducing wind speed
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:2808844
来源机构	北京师范大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/220744
作者单位	1.皖西学院城市建设与环境系, 六安, 安徽 237012, 中国; 2.北京师范大学中国沙漠研究中心, 北京 100875, 中国
推荐引用方式 GB/T 7714	王升堂,邹学勇,张春来,等. 民勤绿洲边缘带灌丛沙丘防风作用研究[J]. 北京师范大学,2007,27(1):104-108.
APA	王升堂,邹学勇,张春来,&程宏.(2007).民勤绿洲边缘带灌丛沙丘防风作用研究.,27(1),104-108.
MLA	王升堂,et al."民勤绿洲边缘带灌丛沙丘防风作用研究".27.1(2007):104-108.