Characteristics of soil saturated hydraulic conductivity and its influencing factors of typical plantations in South Subtropical Zone

Xu Zhenxin; Deng Yusong; Lin Liwen; Liu Deyang; Jiang Daihua; Huang Zhigang; Wei Guoyu

doi:10.12171/j.1000-1522.20200124

Journal of Beijing Forestry University > 2021 > 43(4): 100-107. > DOI: 10.12171/j.1000-1522.20200124

Xu Zhenxin, Deng Yusong, Lin Liwen, Liu Deyang, Jiang Daihua, Huang Zhigang, Wei Guoyu. Characteristics of soil saturated hydraulic conductivity and its influencing factors of typical plantations in South Subtropical Zone[J]. Journal of Beijing Forestry University, 2021, 43(4): 100-107. DOI: 10.12171/j.1000-1522.20200124

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Characteristics of soil saturated hydraulic conductivity and its influencing factors of typical plantations in South Subtropical Zone

1.
Agricultural College of Guangxi University, Nanning 530004, Guangxi, China
2.
Forestry College of Guangxi University, Nanning 530004, Guangxi, China
3.
Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
4.
State-Owned Gaofeng Forest Farm of Guangxi Zhuang Autonomous Region, Nanning 530001, Guangxi, China

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Received Date: May 06, 2020
Revised Date: June 19, 2020
Available Online: March 05, 2021
Published Date: April 29, 2021

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Abstract

Abstract

Objective The changing characteristics and influencing factors of soil saturated hydraulic conductivity in typical plantations were analyzed in South Subtropical Zone, the soil moisture movement law in the soil was studied, which provides basic scientific theoretical support for further study of soil moisture movement law in plantations in this area.
Method Taking the soils of Pinus massoniana, Cunninghamia lanceolata, Eucalyptus urophylla × E. grandis, Mytilaria laosensis and Castanopsis hystrix located in the state-owned Gaofeng Forest Farm of Guangxi Zhuang Autonomous Region of southern China as the research objects, the soil saturated hydraulic conductivity (K_s) of plantations was determined by the constant water head method, and mathematical analysis methods such as correlation analysis and grey correlation analysis were used to explore the characteristics and influencing factors of soil saturated hydraulic conductivity of plantation soils in South Subtropical Zone.
Result (1) The average saturated hydraulic conductivity of Cunninghamia lanceolata and Pinus massoniana was relatively higher, and the average saturated hydraulic conductivity of Eucalyptus urophylla × E. grandis was the lowest. The soil saturated hydraulic conductivity and soil depth of different plantations had the changing rule of decreasing first and then increasing, in which the saturated hydraulic conductivity of the surface soils was significantly higher than that of deep soils. (2) Correlation analysis result showed that content of organic matter, water stable aggregate content greater than 0.2 mm, total porosity, non-capillary porosity, capillary porosity, saturated water content and content of clay were positively correlated with soil saturated hydraulic conductivity, while soil density was significantly negatively correlated with soil saturated hydraulic conductivity. (3) Grey correlation analysis result showed that content of organic matter, water stable aggregate content greater than 0.2 mm, soil density, total porosity, saturated water content, non-capillary porosity and capillary porosity were important factors, content of sand, content of silt and content of clay were the secondary important factors.
Conclusion In comparison to Castanopsis hystrix, Eucalyptus urophylla × E. grandis and Mytilaria laosensis, Cunninghamia lanceolata and Pinus massoniana can significantly increase soil saturated hydraulic conductivity, delay the generation of surface runoff and reduce incidence of soil erosion. Scientific management measures should be paid more attention to effectively improve soil water carrying capacity and water storage capacity.
- saturated hydraulic conductivity,
- South Subtropical Zone,
- plantation,
- grey correlation analysis,
- soil basic property

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References

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Characteristics of soil saturated hydraulic conductivity and its influencing factors of typical plantations in South Subtropical Zone

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