基于LIBS技术的草地小流域磷钾元素空间分布特征研究

发布时间：2018-04-21 10:58

本文选题：LIBS技术 + 小流域　；参考：《内蒙古师范大学》2017年硕士论文

【摘要】：LIBS技术即激光诱导击穿技术是近些年来广泛运用的新型技术,它具有检测速度快,前期处理简单且对样品微损甚至无损,多元素同时分析等优点。基于此,本文选取希拉穆仁草原的闭合小流域为研究对象,分别用LIBS技术与传统实验室方法对所取土壤样品的磷钾元素含量进行检测,通过比较结果验证LIBS技术结果的精确性。最后利用LIBS技术的实验结果分析磷钾元素在小流域的空间分布特征。得出如下结论:(1)LIBS技术测出的磷钾含量与传统实验检测出的结果相比,实验数据准确。两种方法测出的磷钾含量误差率很小,基本都在5%以内,有个别超出5%,但超出部分很小。通过符号检验得出,实验室数据和LIBS技术测出的磷钾含量无显著差异,根据方差分析得到p0.05,呈显著相关,说明传统实验数据与LIBS技术的含量无差异,结果准确。(2)研究区的植被分布特征为在基地内、牧民围封区和径流“滞留”地带,植被的生长状况要好,在放牧条件和旅游区等受人为干扰大的地区,植被的生长状况差。(3)磷元素在小流域的分布特征表现为在植被盖度高、地上生物量大和植被高度高的的区域磷元素的含量要高,还有在径流“滞留”地带,水分条件较好的地方磷元素含量高,最后在牲畜集中驻留的地方磷元素含量比较高。(4)钾元素在小流域的分布特征与磷元素有一定的相似性,在植被生长状况较好的区域钾元素产生富集现象,在天然形成的洼地,水分条件较好的区域钾元素的含量也比较高,还有在牲畜比较集中、停留时间较长的区域钾元素含量高,最后有母质钾长石出露的地区,钾元素富集。
[Abstract]:Laser induced breakdown (LIBS) technology is a new technique widely used in recent years. It has the advantages of high detection speed, simple pre-processing, even non-destructive to samples, and multi-element simultaneous analysis. Based on this, the closed watershed of Xilamuren grassland was selected as the research object, the content of phosphorus and potassium in soil samples was detected by LIBS technique and traditional laboratory method, and the accuracy of the results of LIBS technique was verified by comparing the results. Finally, the spatial distribution characteristics of phosphorus and potassium in small watershed were analyzed by using the experimental results of LIBS technique. It is concluded that the phosphorus and potassium content measured by the LIBS technique is more accurate than that of the traditional experiment. The error rate of phosphorus and potassium content measured by the two methods is very small, basically less than 5%, and some of them exceed 5%, but the excess part is very small. The results of symbol test showed that there was no significant difference in phosphorus and potassium content between laboratory data and LIBS technique, but there was a significant correlation between the two methods according to variance analysis, which indicated that there was no difference between traditional experimental data and LIBS technique. The results showed that the vegetation distribution characteristics of the study area were: in the base, herdsman enclosure area and runoff "detention" zone, the vegetation growth condition should be good, and in the areas where grazing conditions and tourist areas were seriously disturbed by human beings, The distribution of phosphorus in small watershed is characterized by high vegetation coverage, high aboveground biomass and high vegetation height, and high phosphorus content in runoff "retention" zone. The distribution of potassium in the small watershed is similar to that of phosphorus in the small watershed, and the content of phosphorus is higher in the area where livestock live in the area where the water content is better, and the distribution of potassium in the small watershed is similar to that of phosphorus, and the distribution of potassium in the small watershed is similar to that of phosphorus. In areas where vegetation growth is better, potassium is enriched. In naturally formed depressions, the content of potassium is also relatively high in areas with better water conditions, as well as in areas where livestock is relatively concentrated and where the duration of residence is longer. Finally, potassium is enriched in areas where the parent potassium feldspar is exposed.
【学位授予单位】：内蒙古师范大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：S812

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