广西某露天矿区不同复垦模式下土壤的孔隙特征

金属矿山 ›› 2024, Vol. 53 ›› Issue (3): 269-.

广西某露天矿区不同复垦模式下土壤的孔隙特征

王　松1,2　张　硕2　张　钰2　张红霞1　黄太庆3　甘　磊1,2

1. 广西岩溶地区水污染控制与用水安全保障协同创新中心,广西桂林 541004;2. 广西环境污染控制理论与技术重点实验室, 广西桂林 541004;3. 广西农业科学院农业资源与环境研究所,广西南宁 530007

出版日期:2023-03-15 发布日期:2024-04-25
基金资助:
国家自然科学基金项目(编号:4226070061,42067002);广西科技重大专项(编号:桂科AA20302020-2)。

Soil Pore Characteristics under Different Reclamation Modes for a Open-Pit Mine Area in Guangxi

WANG Song1,2　ZHANG Shuo2　ZHANG Yu2　ZHANG Hongxia1　HUANG Taiqing3　GAN Lei1,2

1. Guangxi Collaborative Innovation Center for Water Pollution Control and Safety in Karst Area,Guilin 541004,China; 2. Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology,Guilin 541004,China; 3. Agricultural Resource and Environment Research Institute,Guangxi Academy of Agricultural Sciences,Nanning 530007,China

Online:2023-03-15 Published:2024-04-25

摘要/Abstract

摘要： 广西铝土矿区复垦土壤孔隙结构对土壤复垦质量有重要影响,但其微结构特征尚不明确。为探究当地复垦土壤孔隙结构特征,研究选取草地复垦模式(RG)和裸地复垦模式(RW),利用X 射线CT 扫描技术扫描40 cm 的原状土柱,用Avizo2020 渲染功能,结合ImageJ 软件及其插件获得表征土壤孔隙二维分布和三维特征的参数,并对土壤孔隙结构进行三维重构和可视化分析。结果表明,RG 处理模式土壤中二维小、中孔隙数量较RW 处理模式有所减少,大孔隙数量较RW 处理模式明显增多。在0~20 cm 土层深度内,RG 处理模式下的孔隙面密度相较于RW 处理模式降低了近30%;在20~40 cm 土层深度内,RG 处理模式下的孔隙面密度和孔隙复杂度均大于RW 处理模式。RG 处理模式下的三维总孔隙数较RW 处理模式明显降低,RG 处理模式下的孔隙度(3. 046%) 高于RW 处理模式 (2. 900%),说明RW 处理模式的孔隙多但并不是大孔隙。RG 处理模式的连通度(0. 399) 大于RW 处理模式 (0. 273),弯曲度和比表面积(1. 329,4. 026 mm-1)小于RW 处理模式(1. 342,4. 334 mm-1)。在三维结构中,因2 个处理模式的复垦年限均为2 a,两者孔隙结构均以点状形式分布,同时呈现出倾斜层状结构。但相较于RW,RG 处理模式下的孔隙多为大孔隙,存在清晰可见的长条状孔隙,这预示着RG 处理模式下的土壤朝着更为稳定的结构发展。因此,在广西露天铝土矿区的土壤复垦过程中,草地复垦模式更能促进土壤结构和水肥运移通道的改善,有利于提高土壤质量。

关键词: 复垦模式　孔隙特征　CT 扫描　三维重构

Abstract: The pore structure of reclaimed soil in the bauxite deposit of Guangxi plays a crucial role in soil reclamation quality,but its microstructure characteristics remain unclear. This study aimed to investigate the pore structure features of locally reclaimed soil by examining two reclamation modes:grassland reclamation (RG) and bare land reclamation (RW). X-ray CT scanning technology was employed to scan undisturbed 40 cm soil columns. The ImageJ software and its plugins,in conjunction with the Avizo2020 rendering function,were utilized to obtain parameters that characterize the two-dimensional distribution and three-dimensional characteristics of soil pores. This allowed for the three-dimensional reconstruction,visualization and analysis of soil pore structure. The results indicated a decrease in the quantity of two-dimensional small and medium pores in the soils of the RG treatment model compared to the RW treatment model,while there was a notable increase in the number of large pores in comparison to the RW treatment model. In the 0~20 cm soil layer,the pore surface density of the RG treatment was about 30% lower than that of the RW treatment. In the 20~40 cm soil layer,the pore surface density and pore complexity of the RG treatment surpassed those of the RW treatment. The three-dimensional total pore number was significantly reduced in the RG treatment mode compared to the RW treatment mode. The porosity of the RG treatment (3. 046%) was higher than that of the RW treatment (2. 900%),indicating that the RW treatment resulted in more pores,but not larger ones. The connectivity of the RG treatment (0. 399) exceeded that of the RW treatment (0. 273). However,the tortuosity and specific surface area (1. 329,4. 026 mm-1) were lower in the RG treatment compared to the RW treatment (1. 342,4. 334 mm-1 ). In terms of three-dimensional structure,both treatments had a two-year reclamation time,resulting in a point-like distribution of pore structure and displaying an inclined layered structure. However,compared to the RW treatment,the pores in the RG treatment were mainly distributed in macropores,with clearly visible elongated pores. This suggests that the RG-treated soil is progressing toward a more stable structure. Hence,within the soil reclamation process in Guangxi′s open-pit bauxite mining area,the grassland reclamation model proves more effective in enhancing soil structure and optimizing water and fertilizer transport channels compared to bare land reclamation,ultimately resulting in improved soil quality.

Key words: reclamation mode,pore characteristics,CT scanning,3D reconstruction

王　松, 张　硕, 张　钰, 张红霞, 黄太庆, 甘　磊. 广西某露天矿区不同复垦模式下土壤的孔隙特征[J]. 金属矿山, 2024, 53(3): 269-.

WANG Song, ZHANG Shuo, ZHANG Yu, ZHANG Hongxia, HUANG Taiqing, GAN Lei. Soil Pore Characteristics under Different Reclamation Modes for a Open-Pit Mine Area in Guangxi[J]. Metal Mine, 2024, 53(3): 269-.

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