河西绿洲边缘积沙带的稳定性及其生态效应

生态学杂志

河西绿洲边缘积沙带的稳定性及其生态效应

常兆丰^1,2,3**,张剑挥^1,2,3,王强强^1,2,3,朱淑娟^1,2,3,张大彪^1,2,3,樊宝丽^1,2,3,唐进年^1,2,3,刘世增^1,2,3

（¹甘肃省荒漠化防治重点实验室，兰州 730070； ²甘肃民勤荒漠草地生态系统国家野外科学观测研究站，甘肃民勤 733300； ³甘肃省治沙研究所，兰州 730070）

出版日期:2014-02-10 发布日期:2014-02-10

Stability and ecological effects of accumulated sand-belts along the oasis fringe in Hexi of Gansu.

CHANG Zhao-feng^1,2,3**, ZHANG Jian-hui^1,2,3, WANG Qiang-qiang^1,2,3, ZHU Shu-juan^1,2,3, ZHANG Da-biao^1,2,3, FAN Bao-li^1,2,3, TANG Jin-nian^1,2,3, LIU Shi-zeng^1,2,3

(¹Gansu Key Laboratory of Desertification Combating, Lanzhou 730070, China; ²Minqin National Station for Desert Steppe Ecosystem Studies, Minqin 733300, Gansu, China; ³Gansu Desert Control Research Institute, Lanzhou 730070, China)

Online:2014-02-10 Published:2014-02-10

摘要/Abstract

摘要：

甘肃河西沙区经过60多年的防沙治沙，在绿洲边缘尤其是上风向形成了一条积沙带。积沙带作为绿洲边缘造林固沙和沙障固沙过程中的副产物，其稳定性如何？又具有什么样的生态效应呢？本文分析了甘肃河西沙区绿洲边缘积沙带上21个样点风速、风向等观测资料。结果表明：1）河西沙区绿洲边缘积沙带均处于稳定状态。2）积沙带具有显著的防风作用，且防御风的作用随风速的增大而增强，当风速≥2 m·s^-1时，积沙带下风向防风距离大于积沙带高度的20倍。风速越大，则沙丘下风向降低风速越明显。3）高度是表征积沙带防风功能的一个重要指标，而当风速≥8 m·s^-1时，积沙带顶部风速小于上风向空旷风速。4）气流到达积沙带迎风坡时，通过沿坡面抬升和向两翼分流2种方式释放能量并降低流速。风向偏转会降低迎风坡主风方向的风速。

关键词: 香橙, 硒, 生长, 抗坏血酸-谷胱甘肽循环

Abstract: An accumulated sandbelt formed along the oasis edge, especially at the upwind places of the desert area in Gansu Hexi of China during the process of desert control in recent 60 years. The accumulated sand-belt is a byproduct of desertification combating through afforestation and barriers-setting. This paper analyzed the data (including wind velocity/direction) of 21 sites on the accumulated sandbelt to evaluate its stability and ecological effects. The results showed that the accumulated sandbelt is in a stable state. It plays a significant role in weakening wind and this effect is enhanced with the increase of wind velocity. The height of accumulated sand-belt is an important factor characterizing its windproof function. When the wind velocity is bigger than 2 m·s^-1, the windproof area in the downwind places is 20 times greater than the height of the accumulated sandbelt. When the wind velocity is bigger than 8 m·s^-1, the wind velocity on the top of the accumulated sand-belt is less than that in the upwind open areas. When the air flow reaches the windward slope, its energy is released and reduced by uplifting along the slope and diversion towards the two wings. Wind deflector reduces the velocity of the prevailing wind on the windward slope.

Key words: Xiangcheng, selenium, growth, AsA-GSH cycle.

常兆丰1,2,3**,张剑挥1,2,3,王强强1,2,3,朱淑娟1,2,3,张大彪1,2,3,樊宝丽1,2,3,唐进年1,2,3,刘世增1,2,3. 河西绿洲边缘积沙带的稳定性及其生态效应[J]. 生态学杂志.

CHANG Zhao-feng1,2,3**, ZHANG Jian-hui1,2,3, WANG Qiang-qiang1,2,3, ZHU Shu-juan1,2,3, ZHANG Da-biao1,2,3, FAN Bao-li1,2,3, TANG Jin-nian1,2,3, LIU Shi-zeng1,2,3. Stability and ecological effects of accumulated sand-belts along the oasis fringe in Hexi of Gansu.[J]. cje.

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