دانلود رایگان مقاله لاتین اثر محافظت نبخا بر روی واحه از سایت الزویر
عنوان فارسی مقاله:
اثرات محافظتی نبخا بر روی واحه
عنوان انگلیسی مقاله:
The protective effects of nebkhas on an oasis
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
From the perspective of integrated physical geography, an oasis is a unique geographical unit with stable water supply, fertile soil, and suitable for the growth of plants; it can provide the ideal habitats and production space for human, and is clearly different from the landscape of the surrounding desert in arid area (Shen et al., 2001). In an oasis, stable water supplies depend on river or groundwater with water table no more than 15 m; soils are derived from river alluvium and aeolian fine sediments (Kocurek and Lancaster, 1999; Beveridge et al., 2006); vegetation is mainly composed of natural plants and crops. Oases occupy a small area but bear a disproportionate amount of economic and social developmental pressure in desert regions. Due to their unique landscape and important role in agricultural production, oases have become the focus of an increasing amount of research, and important progress has been made in many fields. For example, previous literature has focused mainly on the economical use of water and soil resources in an oasis (Chen and Zhan, 1995; Zhou, 1994; Misak et al., 1997; Shen et al., 2001), with the goals of maintaining vegetation stability and water-thermal equilibrium (Bornkamm, 1986; Abd EI-Ghani, 1992; Jia and Ci, 2003; Ma et al., 2003), and on the impact of environmental change on oases (Zhang and Wang, 1994; Zhao et al., 2001; Pan and Chao, 2003; Zhang et al., 2003). These studies are important for guiding the use of natural resources in oases. However, due to increasing populations in oases, especially in developing countries, water and soil resources tend to be overused, and it is difficult to implement scientific guidelines for best water and land use into agricultural practice (Shen et al., 2001). For a natural oasis at the edge or inside of a moving sand desert, a population increase puts pressure on water and soil resources, making the oasis appear to be ‘‘moving” rather than vanishing (Desai and Nelson, 2005). Previous studies have reported that nebkhas at the fringe of an oasis are the primary line of defense to prevent blown sand from invading the oasis (Sun, 1995; Gao, 2003). However, this protective function of the nebkhas has not been explained in detail. Although many reports have described the morphology of nebkhas and the airflow field over an isolated nebkha (Arens, 1996; Tengberg and Chen, 1998; Nishimori and Tanaka, 2001), few studies have been conducted on the airflow field over randomly distributed nebkhas or nebkhas at the fringe of an oasis. In the arid zone of northwestern China,
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کلمات کلیدی:
Influence of vegetation cover on sand transport by wind: field studies ... onlinelibrary.wiley.com/.../(SICI)1096-9837(199801)23:1%3C69::AID-ESP823%3E... by N Lancaster - 1998 - Cited by 298 - Related articles Results from 12 different sand transport events show that aerodynamic roughness length and threshold wind shear velocity increase with vegetation cover as ... A simple model for the formation of vegetated dunes - Nishimori - 2001 ... onlinelibrary.wiley.com/doi/10.1002/esp.258/abstract by H Nishimori - 2001 - Cited by 45 - Related articles Sep 6, 2001 - The results have qualitative correspondence to the real counterpart, and the simplicity of the algorithm and the consequent ease of handling ... The protective effects of nebkhas on an oasis - سایپرز www.scipers.com/ePaper-View-8311137=مقاله-اثرات-محافظتی-ne... Translate this page مقاله اثرات محافظتی nebkhas در واحه, در Aeolian Research () توسط Xueyong Zou, Jifeng Li, Bo Liu, Chunlai Zhang, Hong Cheng, Xiaoxu Wu, Liqiang Kang, ... Details - IPR License iprlicense.com/Books/IssnGroup?bookId=17715805 The protective effects of nebkhas on an oasis, Xueyong Zou, View. Threshold wind velocity dynamics as a driver of aeolian sediment mass flux, Nicholas P. li qiang kang-Beijing Normal University| ScholarMate www.scholarmate.com/scmwebsns/resume/view?des3PsnId... Translate this page Xueyong Zou; Jifeng Li; *Bo Liu; Chunlai Zhang; Hong Cheng; Xiaoxu Wu; Liqiang Kang; Ruxing Wang, The protective effects of nebkhas on an oasis, Aeolian ... protective effect - 首页 en.ahau.findplus.cn/?h=search...%22protective%20effect%22 Translate this page The protective effect of breviscapine on BMECs with OGD injury and mechanism study. Academic ... The protective effects of nebkhas on an oasis. Academic ...
