植被覆盖条件下纳米碳对黄土坡面养分流失调控的试验研究

发布时间：2018-02-25 22:16

本文关键词： 纳米碳含量坡面养分流失坡面养分分布人工模拟降雨下垫面　出处：《水土保持研究》2017年06期 　论文类型：期刊论文

【摘要】：将纳米材料应用于坡面养分流失调控对减少黄土坡面养分流失等有着重要意义。基于神木六道沟流域上的坡面人工模拟降雨试验,分析了不同纳米碳含量(质量百分比分别为0%,0.1%,0.5%,0.7%,1.0%)对黄土坡面养分迁移过程的影响。结果表明:(1)同一作物的小区添加不同纳米碳含量对养分流失影响不明显;5种下垫面条件下,养分流失量均呈随纳米碳含量增加而降低的趋势,其中纳米碳含量为0.5%及0.7%对降低径流养分流失量的效果最好。不同纳米碳含量条件下,径流中的养分流失量从小到大为:空地玉米柠条绿豆苜蓿。(2)人工模拟降雨条件下,土壤表层养分在0—5cm内均有明显减少。而大于5cm深度的土壤中的养分值在降雨后有所增加,但随着深度增大养分增加量减少,而且添加不同浓度纳米碳导致养分值减少的速率不同。(3)不同纳米碳含量下与不同植被覆盖下径流中各离子的养分流失调控效果评价是径流中不同离子的平均浓度与平均流失率均随纳米碳含量的增加而减小,规律性较为明显。
[Abstract]:The application of nanomaterials to the regulation of nutrient loss on the slope is of great significance in reducing nutrient loss on the loess slope. Based on the artificial rainfall simulation experiment on the slope of Shenmu Liudaogou watershed, The effects of different nano carbon content (0 0. 1% 0. 1%) on nutrient transfer process of loess slope surface were analyzed. The results showed that the effect of different nano carbon content on nutrient loss was not obvious in the same crop plot under 5 kinds of underlying surface conditions, including 0. 1%, 0. 1%, 0. 5% and 0. 5%, 0. 1%, 0. 1% and 0. 5%, 0. 1%, 0. 1% and 0. 5%. The nutrient loss decreased with the increase of carbon nano-content, and 0.5% and 0.7% nano-carbon content had the best effect on reducing nutrient loss in runoff. The amount of nutrient loss in runoff from small to large is: ground corn Caragana korshinskii mung bean alfalfa. 2) under artificial simulated rainfall conditions, the soil surface nutrient decreased significantly within 0-5 cm, but the nutrient value of soil more than 5 cm depth increased after rainfall. But as the depth increases, the nutrient increases and decreases. And the nutrient loss regulation effect of different carbon content and vegetation cover was evaluated as the average concentration of different ions in runoff. And the average loss rate decreased with the increase of nano-carbon content. The regularity is obvious.
【作者单位】：西安理工大学水利水电学院西北旱区生态水利工程国家重点实验室培育基地;西北农林科技大学水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室;
【基金】：国家自然科学基金重点项目(51239009);国家自然科学基金面上项目(41371239) 陕西省科技支撑项目(2013KJXX-38) 陕西省水利专项支撑计划(2012Slkj-04;2013Slkj-04) 陕西省自然科学基金(2015JQ5161)
【分类号】：S157.4

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