策勒绿洲-沙漠过渡带风成沉积物粒度的空间变化

发布时间：2018-03-12 07:11

本文选题：绿洲-沙漠过渡带　切入点：风成沉积物　出处：《应用生态学报》2017年04期 　论文类型：期刊论文

【摘要】：为了探讨绿洲-沙漠过渡带对绿洲可持续发展的环境效应,本研究对策勒绿洲西缘绿洲-沙漠过渡带、防护林带和绿洲内部的各种风成沉积物及策勒河谷沉积物粒度特征进行比较.结果表明:绿洲-沙漠过渡带风成沉积物粒度特征(包括粒度分布特征、粒度参数、各粒级含量等)在空间上基本一致,其粒度范围为0.3~200μm,分选性良好,主峰众数为67μm,主要为悬浮组分和变性跃移组分,未出现200μm的跃移和蠕移组分,表现出典型的大气沙尘近距离传输沉积的特点.与外围(上风向)的策勒河谷(粒度范围0.3~800μm)和沙漠地区的沉积物比较,过渡带粒度明显偏细,但与过渡带、防护林带和绿洲内部现代尘暴降尘(下风向)各种粒度特征基本一致.策勒绿洲-沙漠过渡带由于存在较高植被覆盖度,能够有效地抑制沙漠地区较粗颗粒组分(200μm)通过变性跃移或蠕移方式输送进入过渡带和绿洲内部.绿洲-沙漠过渡带与防护林体系一样,可有效抑制沙漠入侵绿洲,二者形成一个整体,共同维护策勒绿洲生态环境的稳定.
[Abstract]:In order to study the environmental effect of Oasis desert transition zone on the sustainable development of oasis, this paper studies the countermeasures of Oasis desert transitional zone in the western edge of Le Oasis. The granularity characteristics of eolian sediments (including granularity distribution and granularity parameters) of eolian sediments in oasis desert transitional zone were compared with each other in shelterbelt and oasis. The content of each particle is basically the same in space, and its particle size range is 0.3 ~ (200) 渭 m, the sorting property is good, the main peak mode is 67 渭 m, the main peak is suspended component and denatured jump component, and there is no 200 渭 m jumping and vermicular movement component, the main peak is 67 渭 m, and the main peak is 67 渭 m, and the main peak is 67 渭 m. Compared with the peripheral (upper wind direction) Cele valley (grain size range of 0.3 ~ 800 渭 m) and desert sediments, the transitional zone has a smaller grain size than the transitional zone. The grain size characteristics of the shelterbelt and the modern dust storm (downwind direction) are basically the same. Due to the existence of high vegetation coverage in the Oasis Desert transition zone of Cele, It can effectively restrain the transport of coarse particles (200 渭 m) into the transition zone and oasis by denaturing or vermicular migration. The Oasis-desert transition zone, like the shelterbelt system, can effectively inhibit the invasion of the desert into the oasis. They form a whole and jointly maintain the stability of the ecological environment of Cele oasis.
【作者单位】：中国科学院新疆生态与地理研究所;新疆策勒荒漠草地生态系统国家野外科学观测试验站;中国科学院大学;山西农业大学资源环境学院;
【基金】：国家自然科学基金项目(41601012) 新疆维吾尔自治区科技计划项目(201130106-1)资助~~
【分类号】：P512.2

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