内蒙古河套灌区不同土层有机质空间变异的分形

发布时间：2018-04-12 09:39

本文选题：有机质 + 不同土层　；参考：《干旱地区农业研究》2017年05期

【摘要】：以内蒙古河套灌区解放闸灌域为研究对象,以区域内间隔4 km等间距112个取样点共448个样本为基础,通过多重分形及联合多重分形方法,对有机质含量在不同土层(0~20 cm、20~40 cm、40~70 cm与70~100cm)的空间变异特性及其相互关系进行研究。结果显示,有机质含量0~20 cm至70~100 cm土层的多重分形谱宽度依次为0.933、0.795、0.824、0.805,即在0~20 cm土层空间变异性最大,而20~40 cm土层空间变异性最小。不同土层多重分形谱曲线均表现为左钩状(Δf0),表明在灌域内土壤有机质的空间分布中,数值较大的数据占主导地位。同时从土壤表层到埋深1 m处D(1)/D(0)依次为0.983、0.980、0.973、0.965,其值逐渐减小,即空间分布逐渐由密集区域向稀疏区域转化。联合多重分形分析表明0~20 cm土层与20~40 cm、40~70 cm土层空间变异相关程度较高,而与70~100 cm土层空间变异相关程度较低。
[Abstract]:In the Hetao irrigation area of Inner Mongolia Jiefangzha irrigation area as the research object, in the area of 4 km interval interval 112 sampling points were 448 samples as the foundation, through multi fractal and multifractal method combined, the organic matter content in different soil layers (0~20 cm, 20~40 cm, 40~70 cm and 70~100cm) were studied and their relationship the spatial variation characteristics. The results show that the multifractal organic content of 0~20 cm to 70~100 cm layer spectrum width were 0.933,0.795,0.824,0.805, namely 0~20 cm in soil spatial variability, spatial variability of soil 20~40 and cm minimum. Different soil multifractal spectrum curve showed a left hook (F0), showed that the distribution of soil organic matter in irrigation in the domain space, larger data dominant. At the same time from the soil surface to the depth of 1 m D (1) /D (0) were 0.983,0.980,0.973,0.965, its value decreases, the spatial distribution of The transformation from dense area to sparse area gradually. Joint multifractal analysis shows that the spatial variability of 0~20 cm soil layer is higher than that of 20~40 cm, 40~70 cm soil layer, but has low correlation with 70~100 cm soil layer spatial variability.

【作者单位】：内蒙古农业大学水利与土木建筑工程学院;宁夏回族自治区水利科学研究院;
【基金】：国家自然科学基金项目(51469020)
【分类号】：S153.6

【相似文献】