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首页> 外文期刊>Natural Hazards >Fractal features of soil particle-size distribution of different weathering profiles of the collapsing gullies in the hilly granitic region, south China
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Fractal features of soil particle-size distribution of different weathering profiles of the collapsing gullies in the hilly granitic region, south China

机译：华南丘陵花岗岩区湿润沟壑区不同风化剖面土壤粒度分布的分形特征

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Collapsing gully erosion is one of the most remarkable natural hazards in hilly granitic region of southern China. However, there have been few studies examining the changes of soil particle-size distribution (PSD) associated with soil profiles of the collapsing gullies. In recent years, the fractal method has become a new one to estimate soil structure. It has been proved to be a useful tool to examine soil properties and the relationships with other eco-environmental factors. To study the fractal dimension (D) of soil PSD in soils within different weathering profiles (surface layer, red soil layer, sandy soil layer and detritus layer) and its relationships with PSD and soil properties, we conducted an experiment on four collapsing gullies in four counties (Tongcheng County, Gan County, Anxi County and Wuhua County, labeled as TC, GX, AX and WH, respectively) in the hilly granitic region of southern China. The results showed that different weathering profiles exhibited a significant effect on soil physical-chemical properties and PSD. With the fall of weathering degree (from surface layer to detritus layer), as a result, SOM indicated sharp decrease, bulk density first increased sharply and then declined slightly, the finer soil particles (silt and clay) decreased, and especially the clay contents declined noticeably, whereas the gravel and sand contents increased considerably. D values varied from 2.883 to 2.597 of TC, 2.880 to 2.727 of GX, 2.921 to 2.644 of AX and 2.845 to 2.708 of WH, respectively, finer textures giving greater D values. The D values in the sandy soil layers and detritus layers were lower than those in the surface layers and red soil layers. The linear regression analyses showed that D was remarkable negatively correlated with gravel and sand content and positively correlated with clay contents, SOM. The second-degree polynomial equation was more adequate to describe the correlations between D and soil PSD. The results of this study revealed that fractal dimension can be used to characterize the soil grain-size characteristics and was regarded as an informative indicator for reflecting the weathering degree of different weathering profiles of the collapsing gullies in the hilly granitic region.
机译：崩塌的河谷侵蚀是中国南部丘陵花岗岩区最显着的自然灾害之一。但是，很少有研究调查与崩塌的沟壑的土壤剖面有关的土壤粒径分布（PSD）的变化。近年来，分形方法已经成为一种估计土壤结构的新方法。它已被证明是检查土壤性质以及与其他生态环境因素之间关系的有用工具。为了研究不同风化剖面（表层，红壤层，沙质土壤层和碎屑层）内土壤PSD的分形维数（D）及其与PSD和土壤性质的关系，我们对4个崩塌的沟壑进行了实验。中国南部丘陵花岗岩区的四个县（通城县，赣县，安溪县和五华县，分别标记为TC，GX，AX和WH）。结果表明，不同的风化剖面对土壤理化性质和PSD有显着影响。结果，随着风化程度的降低（从表层到碎屑层），SOM急剧下降，堆积密度先急剧上升，然后略有下降，较细的土壤颗粒（淤泥和粘土）减少，尤其是粘土含量下降明显，而砾石和沙子含量显着增加。 D值分别从TC的2.883到2.597，GX的2.880到2.727，AX的2.921到2.644和WH的2.845到2.708变化，质地越细，D值越大。沙质土壤层和碎屑层中的D值低于表层和红色土壤层中的D值。线性回归分析表明，D与砾石和砂含量显着负相关，与黏土含量SOM正相关。二次多项式方程更适合描述D与土壤PSD之间的相关性。研究结果表明，分形维数可以用来表征土壤粒度特征，并且可以作为反映丘陵花岗岩区不同风化剖面的风化程度的信息指标。

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