Relationship between the fractal dimension of soil aggregates and erosion in degraded lands in the Qinling–Ba mountainous area of China

IF 2.8 3区 地球科学 Q2 GEOGRAPHY, PHYSICAL
Wenfeng Ding, Xunchang Zhang, Li Li, Xiaoxia Tong, Jianmin Li, Yu Zheng
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Abstract

The aggregate size distribution (ASD) is an important soil characteristic that is influenced by soil erosion processes and land degradation. However, very few studies have aimed to explore the responses of the soil ASD to land degradation. With respect to the Qinling–Ba mountainous area in southern Shaanxi Province, China, this study aimed to investigate the soil ASD in different degraded land ecosystems and their responses to erosion using fractal theory. Thirty-three plots (7 m2) classified into five land use types representing different degrees of degradation (agriculture, horticulture, grassland, coppices and mature forest) were established to determine and compare runoff and sediment yield. A total of 99 soil samples were collected, and the soil ASD was analysed to determine the fractal dimension (FD). The results revealed that the aggregate FD values ranged from 2.21 to 2.44 for the dry-sieving method (FDdry) and from 2.70 to 2.82 for the wet-sieving method (FDwet). The average FDdry values followed the order of coppices > agriculture > mature forest > horticulture > grassland, whereas the average FDwet values followed the order of grassland > horticulture > agriculture > coppices > mature forest. Lower FDwet values were associated with soil dominated by larger aggregates. Statistically significant differences in runoff and sediment were found between agriculture, horticulture, grassland and coppices and mature forest at the 0.05 level of significance. The erosion rate was positively and linearly related to the FDwet value (R2 = 0.74, p < 0.05) and negatively related to the FDdry value (R2 = 0.136, p < 0.5). The results indicated that erosion is more notably related to the FDwet value than to the FDdry value. This study highlights the importance of understanding the soil ASD and its implications for erosion processes, which can inform sustainable land management practices and strategies for soil conservation in this region.

秦巴山区退化土地土壤团聚体分形维数与侵蚀的关系
团聚体粒度分布(ASD)是受土壤侵蚀过程和土地退化影响的重要土壤特征。然而,很少有研究旨在探讨土壤ASD对土地退化的响应。以陕南秦巴山区为研究对象,利用分形理论研究了不同退化土地生态系统土壤ASD及其对侵蚀的响应。建立了33个地块(7 m2),分为代表不同退化程度的5种土地利用类型(农业、园艺、草地、灌木林和成熟森林),以确定和比较径流和泥沙产量。共采集99个土壤样品,分析土壤ASD,确定分形维数(FD)。结果表明:干筛法(FDdry)和湿筛法(FDwet)的总FD值分别为2.21 ~ 2.44和2.70 ~ 2.82。平均FDdry值的排列顺序为:农业在成熟森林>;园艺祝辞平均FDwet值依次为草地>;园艺祝辞农业在矮林比;成熟的森林。较低的FDwet值与以较大团聚体为主的土壤有关。农业、园艺、草地和灌木林与成熟林间的径流和泥沙差异在0.05显著水平上。侵蚀速率与FDwet值呈线性正相关(R2 = 0.74, p < 0.05),与FDdry值呈负相关(R2 = 0.136, p < 0.5)。结果表明,侵蚀与FDwet值的关系比与FDdry值的关系更为显著。本研究强调了了解土壤ASD及其对侵蚀过程的影响的重要性,这可以为该地区的可持续土地管理实践和土壤保持战略提供信息。
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来源期刊
Earth Surface Processes and Landforms
Earth Surface Processes and Landforms 地学-地球科学综合
CiteScore
6.40
自引率
12.10%
发文量
215
审稿时长
4 months
期刊介绍: Earth Surface Processes and Landforms is an interdisciplinary international journal concerned with: the interactions between surface processes and landforms and landscapes; that lead to physical, chemical and biological changes; and which in turn create; current landscapes and the geological record of past landscapes. Its focus is core to both physical geographical and geological communities, and also the wider geosciences
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