[1]Zhang Chen,He Youyou,Xue Tingting,et al.Vertical Variation of Physical Properties of Uncultivated Black Soil in Northern Songnen Plain[J].Research of Soil and Water Conservation,2023,30(06):231-240.[doi:10.13869/j.cnki.rswc.2023.06.042]
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Vertical Variation of Physical Properties of Uncultivated Black Soil in Northern Songnen Plain
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
30
Number of periods:
2023 06
Page number:
231-240
Column:
Public date:
2023-10-10
- Title:
- Vertical Variation of Physical Properties of Uncultivated Black Soil in Northern Songnen Plain
- Keywords:
- uncultivated black soil; background characteristics; vertical variation; soil physical properties
- CLC:
- S157.1
- DOI:
- 10.13869/j.cnki.rswc.2023.06.042
- Abstract:
- [Objective] This study aims to investigate the physical properties of uncultivated black soil in the northern Songnen Plain, provide important background values for the restoration of degraded land and soil quality assessment in the black soil area. [Methods] The uncultivated black soil in the north of Songnen Plain, including natural secondary forest and tessellated meadow, was selected as the research object. Soil physical indexes were measured in the 0—140 cm soil layer, and the soil physical properties were comprehensively evaluated by using principal component analysis and cluster analysis. [Results] The soil bulk density of the uncultivated black soil increased gradually with the increase of soil depth, while the total porosity, capillary porosity, saturated water capacity, and capillary water capacity decreased gradually with the increase of soil depth. In the 0—60 cm soil layer, the natural secondary forest had smaller soil bulk density and larger soil porosity and water capacity. The soil texture was clay loam in the 0—100 cm soil layer, and silty clay loam in the ≥100 cm soil layer. The water-stable aggregate content, mean weight diameter, and geometric mean diameter of uncultivated black soil all decreased first and then increased with the increase of soil depth. Overall, the soil water-stable aggregate content(WSA>0.25), mean weight diameter(MWD), and geometric mean diameter(GMD)in the 0—10 cm soil layer of the tessellated meadow were 37.14%, 87.96%, and 110.52% higher than those of natural secondary forest, respectively, but the natural secondary forest showed better performance in the 10—80 cm soil layer. The fractal dimension(D)of soil aggregates was not significantly different between natural secondary forest and tessellated meadow. The results of principal component analysis and cluster analysis showed that there were significant differences in the comprehensive performance of soil physical properties in different soil layers of uncultivated black soil, with the overall performance being the best in the 0—10 cm soil layer, and the soil physical properties of natural secondary forest in the 0—40 cm soil layer being better than those of tessellated meadow. [Conclusion] The surface soil physical properties of uncultivated black soil in the northern Songnen Plain were better than the deep soil, and the natural secondary forest and tessellated meadow soil physical properties were significantly different. The natural secondary forest showed a better improvement effect on soil physical properties in the shallow soil layer.
- References:
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Last Update:
2023-10-10