| Characteristics of matrix flow and preferential flow in gravel\|sand mulched field in different planting years based on multi\|index analysis and fractal dimension |
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| DOI：10.7606/j.issn.1000-7601.2022.01.10 |
| Key Words: preferential flow matrix flow fractal dimension gravel\|sand mulched field planting years |
| Author Name | Affiliation | | RUAN Xiaohan | School of Geography and Planning, Ningxia University, Yinchuan, Ningxia 750021, China
School of Ecology Environment, Ningxia University, Yinchuan, Ningxia 750021, China | | BAI Yiru | School of Geography and Planning, Ningxia University, Yinchuan, Ningxia 750021, China
School of Ecology Environment, Ningxia University, Yinchuan, Ningxia 750021, China | | WANG Youqi | School of Geography and Planning, Ningxia University, Yinchuan, Ningxia 750021, China | | GAO Xiaolong | School of Geography and Planning, Ningxia University, Yinchuan, Ningxia 750021, China
School of Ecology Environment, Ningxia University, Yinchuan, Ningxia 750021, China |
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| Abstract: |
| To clarify the preferential and matrix flow of gravel\|sand mulched field with different planting years and improve the regional water ecological environment,the soil preferential flow and matrix flow characteristics in gravel\|sand mulched field in different planting years (2, 5, 10, 20, 30 a and 40 a) were analyzed by the field dyeing tracer test, combined with morphology, multi\|index analysis and fractal theory. The gravel\|mulched land with different planting years was used as the research object. The results showed that with the increase of planting years, the soil bulk density increased significantly (P<0.05), and the saturated hydraulic conductivity decreased significantly (P<0.05). The ratio of the gravel size of the sand\|pressed ground basically showed that the proportion of gravels larger than 5 mm decreased, and the proportion of gravels smaller than 5 mm increased. Compared with 2 a, the dyeing area ratio of 5, 10, 20, 30 a, and 40 a was reduced by 34.60%, 35.02%, 47.51%, 64.71%, and 72.15%, and the depth of matrix flow decreased by 12.46, 14.77, 17.6, 22.47, 23.45 cm, respectively. The matrix flow ratios were 2 a (98.61%)> 5 a (86.35%)> 10 a (74.89%)> 20 a (74.49%)> 30 a (64.11%)> 40 a (63.76%), and the preferential flow ratios were 2 a(1.39%)＜5 a(13.65%)＜10 a(25.11%)＜20 a(25.52%)＜30 a(35.89%)＜40 a(36.24%). The fractal dimension of the wet front trace was 2 a<10 a<5 a<20 a<30 a<40 a, meaning when the planting age increased, the irregularity of the wet front trace increased too. Comprehensive dyeing characteristic parameters and fractal dimensions indicated that the longer the planting years, the higher the unevenness of the dyeing morphology of the gravel\|sand mulched field became.The proportion of matrix flow area gradually decreased while the proportion of preferential flow area and the degree of development increased over time. |
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