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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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新疆和田河流域柽柳沙堆的生物地貌发育过程
DOI: 10.11821/xb200705002, PP. 462-470
Keywords: 柽柳,灌丛沙堆,生物地貌,和田河
Abstract:
柽柳沙堆是我国干旱区分布最为广泛的灌丛沙堆类型之一。在实地考察新疆和田河流域柽柳生态地理特征、测量223个柽柳沙堆形态,并在两个野外观测点上实测4个沙堆的风沙流剖面,结合室内风洞实验段风速8m/s条件下模拟沙堆风流场结构等综合分析方法,本文探讨了柽柳沙堆的生物地貌学特征及其发育过程。结果表明研究区柽柳的生态类型属于以胡杨林与灌木林下土壤为基础的吐加依土生境类型,这个生境类型可以进一步划分为三个亚生境,这些亚生境反映了柽柳沙堆不同发育阶段的生态环境特征。由于柽柳灌丛的寿命长、木质化枝干的刚性较强、根株萌发力强耐风蚀沙埋,可对地面风沙流运行产生强烈扰动,其风速剖面有别于芦苇沙堆和骆驼刺沙堆,风流场结构有利于聚集风沙,因此风沙依托柽柳灌丛堆积发育而成的柽柳沙堆平均坡度较大、沙堆存活与发育的周期也较长
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