引用本文:周虎,李保国,吕贻忠,郑金玉,刘武仁.不同耕作措施下土壤孔隙的多重分形特征[J].土壤学报,2010,47(6):1094-1100. DOI:10.11766/trxb200906190269
Zhou Hu,Li Baoguo,Lv Yizhong,Zheng Jinyu,Liu Wuren.Multifractal characteristics of soil pore structure under different tillage systems[J].Acta Pedologica Sinica,2010,47(6):1094-1100. DOI:10.11766/trxb200906190269
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不同耕作措施下土壤孔隙的多重分形特征
周虎,李保国,吕贻忠,郑金玉,刘武仁
1.中国农业大学资源与环境学院土壤与水科学系;2.吉林省农业科学院
摘要:
首先利用数字图像处理技术提取了东北黑土区长期免耕(no tillage, NT)和翻耕(moldboard tillage, MT)制度下土壤切片中的孔隙信息,然后应用矩方法研究了两种耕作制度下土壤孔隙结构的多重分形特征。结果表明,免耕降低了表层(0~5 cm)大孔隙度(>500 μm),但是提高了10~15 cm和20~25 cm深度的孔隙度和大孔隙度。土壤孔隙结构在64~1 024像素尺度上具有多重分形特征。广义维(Dq)和多重分形谱(f(α))及相关参数能够反映切片中孔隙结构的特征。表层土壤孔隙多重分形谱明显右偏,随深度增加趋于对称。在同一深度下,免耕处理的Δα(α-1010)和ΔD(D-10-D10)均大于翻耕处理,免耕处理增加了孔隙结构的复杂程度,尤其是10~15 cm和20~25 cm深度下的孔隙结构。
关键词:  土壤耕作  多重分形  土壤孔隙结构  土壤切片
基金项目:“十一五”国家科技支撑计划 保护性土壤耕作关键技术与轮作模式研究项目(2006BAD1501) 和高等学校博士学科点科研基金项目(20060019037)资助
Multifractal characteristics of soil pore structure under different tillage systems
Zhou Hu1, Li Baoguo2, Lv Yizhong2, Zheng Jinyu3, Liu Wuren3
1.Institute of Soil Science, Chinese Academy of Sciences;2.China Agricultural University;3.Jilin Academy of Agricultural Sciences
Abstract:
Soil pore systems under no tillage (NT) and moldboard tillage (MT) in the black soil zone of Northeast China were extracted from soil thin sections with digital image process techniques and the multifractal characteristics of soil pore structure were studied with method of moment. Results indicate that NT decreased the macroporosity (>500 m) in〖LM〗 the surface layer (0~5 cm),but increased the total porosity and macroporosity at 10~15 and 20~25 cm depth. Multifractal characteristics were observed at 64~1 024 pixel scales and generalized dimensions (Dq),multifractal spectral (f (α)) and other related parameters reflected characteristics of the pore structure in the soil sections under NT and MT. The multifractal spectra of the pores in the surface layer apparently leaned toward the right side but approached to symmetry with increasing depth. Compared to MT,NT increased the Δα(α-1010) and ΔD (D-10-D10) of soil pore structure,and complexity of soil pore system,especially at 10~15 cm and 20~25 cm in depth.
Key words:  Soil tillage  Multifractal  Soil pore structure  Soil thin section