伏牛山区迎河小流域不同土地利用类型的土壤粒径分布特征

发布时间：2018-10-14 19:39

【摘要】：为探讨伏牛山区坡耕地土壤物理性能的退化特征,在河南省鲁山县迎河小流域,利用激光粒度仪和土壤分形模型,比较分析了4种土地利用类型的土壤粒径分布(PSD)及其分形特征。研究结果表明:1)土壤PSD简单分维(D_v)以乔木林地最高(2.658),坡耕地最低(2.489),多重分维(容量维D_0、信息维D_1、关联维D_2)以乔木林地最高(0.941、0.926、0.91),坡耕地最低(0.927、0.899、0.849)。不同分形参数均表现为:坡耕地灌草坡地和水平梯田乔木林地;2)土壤PSD的D_v、D_0、D_1和D_2,与黏粒和粉粒体积分数显著正相关,与砂粒体积分数显著负相关。因此,利用土壤PSD简单分形和多重分形维数,可量化表征土壤质地的粗细程度和非均匀性质的差别;坡耕地土壤质地的粗粒化程度和非均匀性明显大于其他土地利用类型;土壤细粒(黏粒和粉粒)物质流失是坡耕地土壤质地粗粒化和非均匀程度增大的重要原因。
[Abstract]:In order to study the degradation characteristics of soil physical properties of sloping farmland in Funiu Mountain area, in Yinghe small watershed of Lushan County, Henan Province, laser particle size analyzer and soil fractal model were used. Soil particle size distribution (PSD) and fractal characteristics of four land use types were compared and analyzed. The results showed that: 1) the simple fractal dimension (Dv) of soil PSD was highest in Arbor woodland (2.658), lowest in sloping farmland (2.489), multifractal dimension (capacity dimension D0, information dimension D1, correlation dimension D2), and Arbor woodland was the highest (0.941 ~ 0.926 ~ 0.91), sloping farmland was the lowest (0.927 0.899 / 0 ~ 0.849). The different fractal parameters were as follows: slope land and horizontal terrace trees and woodlands; (2) the PSD of soil DVX D _ (0) D _ (1) and D _ (2) had a significant positive correlation with the volume fraction of clay and silt particles, and a significant negative correlation with the volume fraction of sand particles. Therefore, simple fractal and multifractal dimensions of soil PSD can be used to quantify the difference between soil texture thickness and non-uniformity, and the coarse graining degree and non-uniformity of soil texture in sloping farmland are obviously higher than those in other land use types. The loss of soil fine particles (clay and silt) is an important reason for the increase of coarse graining and uneven degree of soil texture in sloping farmland.
【作者单位】：山东省土壤侵蚀与生态修复重点实验室/山东农业大学林学院;水利部水利水电规划设计总院;山东省水文局;
【基金】：淮河水利委员会水土保持管理项目“淮河流域国家水土保持重点工程区水土流失存在问题及防治对策”(HWSBC2015002)
【分类号】：S157

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