季节性冻融对东柳沟流域风沙土分离能力的影响

发布时间：2018-06-07 23:07

本文选题：冻融作用 + 冻融循环　；参考：《中国水土保持科学》2017年06期

【摘要】：季节性冻融是影响我国内蒙古地区风沙土侵蚀的重要因素之一,为研究冻融作用与水动力条件对风沙土分离能力的影响,本文采用正交实验的方法,通过人工冻融和室内放水冲刷实验,对内蒙古东柳沟流域的风沙土分离能力的变化特征进行研究。结果表明:1)坡度、流量、土壤含水量、冻融循环次数和土层深度对土壤分离能力均具有显著影响(P0.05),风沙土分离能力对各因素敏感程度大小为:坡度流量冻融循环次数土壤含水量土层深度;2)风沙土分离能力与流量和坡度呈正线性相关(R20.94),土壤分离能力的临界流量是0.07 L/min,临界坡度是6%;3)土壤含水量、冻融循环次数和土层深度主要是通过改变土壤性质来间接影响风沙土分离能力:土壤含水量较高较低都会导致土壤分离能力增加,当土壤含水量为6%时,风沙土分离能力最小。土层深度对土壤分离能力的影响与土壤含水量的影响基本一致,中间土层分离能力较小。土壤分离能力随冻融循环次数的增加显著增加,但是10次循环后逐渐减小并趋于平缓。研究结果表明,冻融作用增大了风沙土分离能力,可导致季节性冻融区春季解冻期土壤侵蚀量增加。本研究可为季节性冻融区风沙土侵蚀机理的研究提供参考。
[Abstract]:Seasonal freezing and thawing is one of the important factors affecting the erosion of wind-sand soil in Inner Mongolia. In order to study the influence of freeze-thaw and hydrodynamic conditions on the separation ability of wind-sand soil, the orthogonal experiment method is used in this paper. Based on the experiments of artificial freeze-thaw and indoor flushing, the characteristics of the separation ability of wind-sand soil in Dongliugou watershed of Inner Mongolia were studied. The results show that the slope, flow rate, soil water content, The number of freeze-thaw cycles and the depth of soil layer have significant effects on the soil separation capacity. The sensitivity of wind-sand soil separation ability to various factors is as follows: slope flow freezing and thawing cycle times soil moisture content soil depth 2) wind-sand soil separation. The critical flow rate of soil separation ability is 0.07 L / min, and the critical slope is 6 ~ 3) soil water content. The frequency of freeze-thaw cycle and the depth of soil layer indirectly affect the separation ability of wind-sand soil mainly by changing soil properties: higher and lower soil moisture content will lead to the increase of soil separation ability, and when soil moisture content is 6, the separation ability of wind-sand soil is the least. The effect of soil depth on soil separation capacity is basically consistent with that of soil moisture content, but the intermediate soil layer has less separation ability. Soil separation capacity increased significantly with the increase of freeze-thaw cycles, but gradually decreased after 10 cycles. The results showed that freezing and thawing increased the separation ability of wind-sand soil, which resulted in the increase of soil erosion during the spring thawing period in seasonal freeze-thaw region. This study can provide a reference for the study of erosion mechanism of wind-sand soil in seasonal freeze-thaw region.
【作者单位】：西北农林科技大学水土保持研究所;广西壮族自治区水利科学研究院;西北农林科技大学资源环境学院;
【基金】：国家自然科学基金重点项目“黄土高原生态建设的生态-水文过程响应机理研究”(41330858) 西北农林科技大学大学生创新训练项目“季节性冻融对土壤可蚀性的影响研究”(201610712035) 广西水利科技项目“红水河流域地区马尾松水保林建设及水源涵养功能量化研究”(201214)
【分类号】：S157.1

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