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| DOI：10.13522/j.cnki.ggps.2025402 |
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| Effects of soil texture on pore structure and water retention of soil in tea plantation |
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Lin Xiaobing, Chen Guojun, Sun Yongming, Huang Shangshu, Wang Binqiang, He Shaolang, Xu Hui, Wan Xiaobing, Lei Liwen
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Key Laboratory of Arable Land Improvement and Quality Improvement of Jiangxi Province, Jiangxi Institute of Red Soil and Germplasm Resources, Nanchang 330046, China
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| Abstract: |
| 【Objective】Soil texture is an important factor affecting soil pore structure and water retention capacity, which control plant-available soil water. This paper investigates the spatial variation in soil texture in tea plantations and its regulatory effects on soil pore structure and soil water content. 【Method】We studied 72 typical tea plantations across seven major tea-producing regions in Jiangxi Province. We measured soil particle composition, bulk density, total porosity, three-phase composition, saturated water-holding capacity, field capacity and relative water content of soil samples collected from these plantations.【Result】Soil texture in the study area was diverse, dominated by loamy clay (37.50%) and silty clay (20.83%). Sand content showed the highest spatial variability, with a coefficient of variation of 52.25%. Soil texture significantly affected soil physical structure. Clay loam had a significantly high bulk density than silty clay, sandy loam and loamy clay, while loamy clay featured favorable soil pore structure and high total porosity compared with sandy loam and clay loam. Soil texture is a key factor regulating soil water retention. Loamy clay had the highest saturated water-holding capacity (415.02 mg/kg), while clay soil exhibited the strongest available water retention capacity, with a relative water content of 54.07%. Correlation analysis revealed that sand particle content increased significantly with elevation and slope, but decreased significantly with longitude, latitude and plantation age. Silt particle content was significantly positively correlated with longitude, latitude and plantation age, and negatively correlated with elevation, slope and aspect. Clay particle content was significantly positively correlated with relative soil water content, longitude and latitude, and negatively correlated with elevation.【Conclusion】Soil texture in the tea plantations of Jiangxi Province is spatially heterogeneous, mainly controlled by topographic and geographical factors. Loamy clay exhibited the optimal soil pore structure and saturated water-holding capacity, whereas clay soil performed best in retaining available soil water. |
| Key words: soil texture; tea plantations; particle composition; soil pore; soil moisture |
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