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[1]Yang Zhiqiang,Meng Chen,Wang Xing,et al.Evolution of Soil Macropore Topological Structure After the Artificial Introduction of Caragana korshinskii in Desert Steppe[J].Research of Soil and Water Conservation,2024,31(02):92-100.

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Evolution of Soil Macropore Topological Structure After the Artificial Introduction of Caragana korshinskii in Desert Steppe

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 31 Number of periods: 2024 02 Page number: 92-100 Column: Public date: 2024-03-20

Title:: Evolution of Soil Macropore Topological Structure After the Artificial Introduction of Caragana korshinskii in Desert Steppe

Author(s):: Yang Zhiqiang^1,2,3, Meng Chen^2,3,4, Wang Xing^2,3,4, Zhu Zhihao^2,3,4, Song Naiping^2,3,4, Du Lingtong^2,3,4; (1.College of Agriculture, Ningxia University, Yinchuan 750021, China; 2.State Key Laboratory of Land Degradation and Ecosystem Restoration in Northwest China, Ningxia University, Yinchuan 750021, China; 3.Key Laboratory of Restoration and Reconstruction of Degraded Ecosystem in Northwest China, Ministry of Education, Yinchuan 750021, China; 4.College of Ecology and Environment, Ningxia University, Yinchuan 750021, China)

Keywords:: desert steppe; planted Caragana korshinskii; soil macropore; topological structure; computed tomography(CT)scan

CLC:: S152.5

DOI:: -

Abstract:: [Objective] The aims of this study are to understand the effects of planted Caragana korshinskii on soil ecological processes, and to provide a scientific basis for the management of artificial vegetation. [Methods] This study focused on the planted C. korshinskii forest with ages ranging from 9 years to 35 years in a typical desert grassland area of Yanchi County, Ningxia. The changes in the geometric distribution and topological structure of macropores in soil after the introduction of C. korshinskii were studied. Computed tomography(CT)scanning and image processing were applied to soil samples collected from the undisturbed soil column to identify the geometric distribution of soil macropores and their topological parameters. These parameters included macropore surface area, equivalent diameter, and connectivity. [Results] The three-dimensional(3D)CT images indicated a relatively small number of macropores in the 0—200 mm soil layer of plots 0 a, whereas those in the 0—200 mm layer of other plots were significantly higher and showed a more complex structure with stand age. Quantitative analysis showed the significant differences in the quantities, lengths, equivalent diameters, and connectivity of macropores of the same soil layers between different ages of C. korshinskii forest(p<0.05), although there were no significant differences in surface area density and volume density(p>0.05). The quantity density and length density of macropores in the 0—100 mm and 100—200 mm soil layers significantly increased(p<0.05)with the increase of forest age, with that in surface soil(0—100 mm)exceeding that in deep soil(100—200 mm). The equivalent macropore diameters for different ages of C. korshinskii forest decreased and increased significantly in 0—100 mm and 100—200 mm soil layers, respectively(p<0.05). In contrast, macropore connectivity increased and decreased significantly in the 0—100 mm and 100—200 mm soil layers, respectively(p<0.05). Further analysis showed positive correlations between stand age and the number density, length density, and surface area density of macropores(p<0.05), but a negative correlation with the equivalent diameter of macropores(p<0.01), whereas there was no significant relationship with the volume density of macropores(p>0.05). [Conclusion] The artificial introduction of C. korshinskii forest can promote a complex and compact macropore network structure, thereby improve the topological structure of macropores and increase soil connectivity. These effects on soil increase with increase of forest age. The results of this study can inform the use of artificial vegetation for restoration and management of aeolian soil in arid and semi-arid areas.

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Last Update: 2024-04-20