| 张兴,徐洋洋,左西宇,王天阳,樊向阳,陈俊英.基于多重分形理论的再生水灌溉下土壤粒度分析[J].干旱地区农业研究,2023,(6):227~237 |
| 基于多重分形理论的再生水灌溉下土壤粒度分析 |
| Analysis of soil particle size distribution under reclaimed water irrigation based on multifractal theory |
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| DOI：10.7606/j.issn.1000-7601.2023.06.24 |
| 中文关键词: 再生水灌溉 土壤粒度 广义维数谱 多重分形 非均质性 |
| 英文关键词:reclaimed water irrigation soil particle generalized dimensional spectrum multiple fractals non\|homogeneity |
| 基金项目:国家自然科学基金项目（51979234） |
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| 中文摘要: |
| 再生水灌溉是缓解水资源矛盾的有效途径，为表征再生水灌溉后土壤粒度分布(Soil particle size distribution，PSD)特性，通过室内土柱模拟试验，设置生活污水(W1)、再生水1(W2)和再生水2(W3)共计3种灌溉水质，并以自来水(W4)作为对照，采用马尔文激光粒度仪测定灌溉1 a后各处理土壤颗粒百分比，运用分形理论分析了4种水质处理下土壤PSD的分形特征。结果表明：（1）4种水质处理下土壤PSD呈单峰分布；与W4处理相比，W1、W2、W3处理下土壤黏粒含量增加0.40%~6.38%，砂粒含量降低1.58%~13.80%，土壤非均匀性增强，但各处理间差异不显著。（2）再生水灌溉下土壤颗粒呈细粒化趋势，土壤PSD多重分形参数增大，土壤PSD趋于不均匀。在0~10 cm土层，W3处理下土壤PSD多重分形参数容量维数D(0)、信息维数D(1)、相关维数D(2)和多重分形奇异谱宽Δα(q)最大，分别为0.943、0.837、0.823和1.035；在10~20 cm土层，W2处理下D(0)、D(1)、D(2)和Δα(q)最大，分别为0.943、0.851、0.852和1.009。（3）土壤PSD的多重分形参数D(0)、D(1)、D(2)、Δα(q)和α(0)与土壤黏粒含量呈显著正相关，与砂粒含量呈显著负相关，土壤分形特征由土壤中黏粒与砂粒的相对含量控制。研究表明，在试验期内，再生水灌溉下土壤PSD的空间异质性与非均匀性增大，可以通过多重分形参数进行定量表征。 |
| 英文摘要: |
| Reclaimed water irrigation is an effective way to alleviate water shortages. To characterize the soil particle size distribution (PSD) after irrigation with reclaimed water, this study conducted indoor soil column simulation experiments. The experiment set up three water qualities: domestic wastewater (W1), reclaimed water 1 (W2) and reclaimed water 2 (W3), with tap water (W4) as the control. In this study, the percentage of soil particles was determined using a Malvern laser particle sizer and the fractal characteristics of soil PSD under four water quality treatments were analyzed using single and multiple fractal theory. The results showed: (1) Soil PSD showed a single\|peak distribution under the four water quality treatments. Compared with the W4 tap water treatment, soil clay content increased by about 0.40%~6.38% and sand content decreased by about 1.58%~13.80% under W2, W3 and W1 treatments. Although soil non\|uniformity increased, the differences between treatments were not significant. (2) Under reclaimed water irrigation, soil particles tended to be fine\|grained, and soil PSD multiple fractal parameters increased, and soil PSD tended to be inhomogeneous. In the 0~10 cm soil layer, the soil PSD multifractal parameters capacity dimension D(0), information dimension D(1), correlation dimension D(2) and multifractal singularity spectral width Δα (q) maximized under W3 treatment with 0.943, 0.837, 0.823 and 1.035, respectively. In the 10~20 cm soil layer, D(0), D(1), D(2) and Δα(q) were the largest under the W2 treatment with 0.943, 0.851, 0.852 and 1.009, respectively. (3) By correlation analysis, the multiple fractal parameters D(0), D(1), D(2), Δα(q), and α(0) of soil PSD were significantly positively correlated with soil clay grain content and negatively correlated with sand grain content. Soil fractal characteristics were controlled by the relative content of clay and sand grains in the soil. The above study showed that the spatial heterogeneity and non\|uniformity of soil PSD under irrigation with reclaimed water increased during the experimental period, which were able to be characterized quantitatively using over multiple fractal parameters. The study has a certain guiding and reference value for the efficient and safe utilization of renewable water resources. |
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