三峡库区不同土地利用方式的土壤持水性能

doi:10.16843/j.sswc.2023.05.003

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Abstract [Background] Soil water-holding capacity determines its function of water conservation and indirectly reflects its capacity of water redistribution. Land use type is one of the factors affecting soil water-holding capacity. Reasonable land use types may improve soil structure and soil fertility, and adjust hydrothermal conditions for plant growth. Thus, it is desirable to take the soil under three land use types (garden, woodland and farmland) in six catchment areas of the Sunxi River watershed in Jiangjin city, Chongqing as the research object to explore the differences and influencing factors of soil water-holding capacity. The result may provide a reference for the selection of land use types in the Three Gorges Reservoir area. [Methods] We collected 126 undisturbed soil samples in total under garden, woodland and farmland for soil bulk density and water-holding capacity measurement, and 126 composite soil samples for organic matter determination. The ANOVA was used to clarify the differences of soil bulk density, soil porosity and soil water-holding capacity under different land use types and different catchment areas, and correlation analysis and stepwise regression were applied to find out the dominant factors affecting soil water-holding capacity. [Results] 1) Significant differences were found for soil bulk density, total porosity and non-capillary porosity at soil depth of 20-40 cm under different land use types (P<0.05). The soil bulk density was in the order of farmland> garden> woodland with a significant difference between farmland and woodland, while the total porosity and non-capillary porosity showed the opposite trend. 2) The mean values of soil saturated water content, capillary water capacity and field capacity of woodland at 0-40 cm were the largest, and the soil water-holding capacity was woodland> garden> farmland. 3) The water-holding capacity was shown as lower section> middle section> upper section of the Sunxi River with a significant difference between the lower section and the upper section under the same land use type (P<0.05). 4) At depth of 0-40 cm, the soil water-holding capacity showed a significantly negative correlation with soil bulk density,significant positive correlations with total porosity, capillary porosity, non-capillary porosity and soil aeration (P<0.05), but no significant correlations with soil volumetric water content and soil organic matter content (P>0.05).[Conclusions] Soil water-holding capacity is the highest in the woodland and the lowest in the farmland. Soil bulk density and soil porosity are the main affecting factors. The results can provide a reference for land use planning and data support for soil erosion control in Jiangjin city.

Key words： land use type soil water-holding capacity catchment area Jiangjin city

Received: 19 May 2022

PACS:

S157.9

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	Articles by authors
	HOU Wenning
	WANG Haiyan
	NING Yihong
	ZOU Jiahe
	ZHAO Han

Cite this article:

HOU Wenning,WANG Haiyan,NING Yihong, et al. Soil water-holding capacity under different land use types in the Three Gorges Reservoir area[J]. SSWC, 2023, 21(5): 19-28.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2023.05.003 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2023/V21/I5/19

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