青海湖沙区风沙土土壤机械组成特征

发布时间：2018-02-27 21:17

本文关键词： 风沙土土壤机械组成青海湖沙区　出处：《甘肃农业大学学报》2016年01期 　论文类型：期刊论文

【摘要】：【目的】掌握青海湖沙区土壤颗粒物组成特征,为防治措施生态效益的定量评价提供依据.【方法】选择青海湖沙区的典型样区,通过野外调查、采样及室内实验分析,对青海湖沙区风沙土的颗粒组成特征进行研究.【结果】青海湖沙区示范区的草方格设置从2008年才开始,属固沙的初步阶段,颗粒较粗,颗粒组成与流动沙丘相似,颗粒组成以较粗的颗粒为主.海晏县克土为早期治理区,各样点均以粒径0.25~0.5mm的中沙颗粒为主,栽植青杨和沙棘的草方格中的粗沙含量较植被覆盖较高的早期治理区高,粉沙和极细沙几乎为零.湖东-种羊场草方格中的风沙土颗粒组成以0.1~0.25mm的细沙为主,0.25~0.5mm的次之,其他粒径的颗粒含量均非常少.沙岛治理区中风沙土颗粒以中沙和细沙为主,其他粒径的颗粒含量均较少.流动沙丘的中沙和粗沙含量较高.示范区的草方格与流动沙丘颗粒组成均表现为以中沙和细沙为主.【结论】沙漠化治理年限较长的区域,植被覆盖较好,风沙土颗粒较细.
[Abstract]:[objective] to grasp the characteristics of soil particulate matter composition in Qinghai Lake sandy area, and to provide the basis for the quantitative evaluation of ecological benefits of control measures. [methods] A typical sample area of Qinghai Lake sandy area was selected, and field investigation, sampling and laboratory experiment analysis were carried out. The characteristics of particle composition of windy sand soil in Qinghai Lake sandy area were studied. [results] the grass grid setting in the demonstration area of Qinghai Lake sandy area only started from 2008, which is a preliminary stage of sand fixation, with coarse particles and similar particle composition to mobile sand dunes. The grain composition was mainly coarse grain. Haiyan County soil was the early control area, and all the points were mainly middle sand particles with the diameter of 0.25 ~ 0. 5 mm. The coarse sand content in the grass grid of poplar and Hippophae rhamnoides was higher than that in the early control area with higher vegetation cover, and the content of coarse sand in the grass grid of poplar and Hippophae rhamnoides was higher. Silt and very fine sand were almost zero. The grain composition of aeolian sand in the grass grid of Hudong-Sheep Farm was 0.1 ~ 0.25mm, followed by 0.25mm, and the content of other particles was very small. The fine sand particles were mainly medium sand and fine sand in the control area of sandy island. The grain contents of other particles are less, and the content of middle sand and coarse sand is higher in mobile dune. The grain composition of grass grid and mobile sand dune in the demonstration area is mainly medium sand and fine sand. [conclusion] the desertification control period is longer. Vegetation cover is better, sand particles are fine.
【作者单位】：宁夏大学资源环境学院;北京师范大学地表过程与资源生态重点实验室;
【基金】：国家自然科学基金(41201087)
【分类号】：S151.9

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