本文選題：濺蝕 + 磁性示蹤劑�。� 參考：《土壤學報》2017年05期

【摘要】：磁性示蹤研究坡面土壤侵蝕已取得一定成果,但目前的磁性示蹤方法不能滿足次降雨后的濺蝕特征研究。因此,在無磁性的石英砂上施用不同濃度(1.5%、2.5%、3.5%)和不同粒徑(20 nm、200 nm)的納米磁性材料,而后進行人工模擬濺蝕試驗,利用磁化率儀和3D手持微地形掃描儀研究地表磁性變化與濺蝕后地表特征變化之間的關系,研究利用納米磁性材料表征濺蝕特征的可行性。結果表明:20 nm磁性材料提高石英砂磁性背景值的幅度遠高于200 nm磁性材料且不同濃度的磁性差異極顯著,兩種納米磁性材料均呈現(xiàn)出布設濃度越大,示蹤時間越長的特點;濺蝕后表層磁化率隨濺蝕時間的延長而逐漸衰減,二者呈現(xiàn)出相關性較高的χ_1=aln(t)+b對數(shù)函數(shù)關系;20 nm磁性材料在3.5%濃度下可有效定量表征出石英砂濺蝕量的變化(p0.01),二者之間的相關關系可用χ_2=a Mb冪函數(shù)表示;20 nm磁性材料在濺蝕3 min內(nèi)的磁化率變化與微地形高差變化呈極顯著相關關系(p0.01),說明20 nm磁性材料可以在短時間內(nèi)有效表征出濺蝕地表的侵蝕程度,可表征出的侵蝕厚度在-5~10 mm內(nèi)。該研究證明20 nm磁性材料表征濺蝕地表特征的方法在一定程度上是可行的,可為磁性示蹤法的深入研究提供新的思路和方法。
[Abstract]:Magnetic tracer has achieved some achievements in soil erosion on the slope, but the current magnetic tracing method can not meet the characteristics of splash erosion after secondary rainfall. Therefore, the magnetic materials of different concentrations (1.5%, 2.5%, 3.5%) and different particle sizes (20 nm, 200 nm) are applied on the non magnetic quartz sand, and then the artificial simulated splash corrosion test is carried out, and the magnetic field is used in the magnetic field. The relationship between the change of surface magnetism and the change of surface characteristics after splashing is studied by the rate meter and the 3D handheld microtopography scanner. The feasibility of using the nano magnetic material to characterize the splash corrosion is studied. The results show that the amplitude of the magnetic background value of 20 nm magnetic materials is much higher than that of the 200 nm magnetic materials and the magnetic difference poles of different concentrations are different. Obviously, the larger the two nano magnetic materials show the larger the concentration and the longer the tracing time, the surface magnetization decreases gradually with the prolongation of the splashing time, and the two has a higher correlation logarithmic function relationship with the X _1=aln (T) +b, and the 20 nm magnetic material can effectively characterize the splash erosion of quartz sand under the concentration of 3.5%. Change (P0.01), the correlation between the two can be expressed by the X _2=a Mb power function; the magnetic susceptibility change of 20 nm magnetic material in the splash corrosion 3 min has a very significant correlation with the change of the height difference of the microtopography (P0.01). It shows that the magnetic material can effectively characterize the erosion degree of the splashed surface in a short time, and the erosion thickness can be characterized in -5. ~10 mm. The study shows that the method of characterizing the surface characteristics of the splash erosion by 20 nm magnetic materials is feasible to some extent. It can provide new ideas and methods for the further study of magnetic tracer method.

【作者單位】： 福建農(nóng)林大學資源與環(huán)境學院福建省土壤環(huán)境健康與調(diào)控重點實驗室;
【基金】：國家科技支撐計劃項目(2014BAD15B0303) 國家自然科學基金項目(41571272) 福建省自然科學基金項目(2015J01156)資助~~
【分類號】：S157
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本文編號：1785481