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RGB Imaging and Irrigation Management Reveal Water Stress Thresholds in Three Urban Shrubs in Northern China

文献类型： 外文期刊

作者： Niu, Yuan 1 ; Xu, Xiaotian 2 ; Huang, Wenxu 2 ; Li, Jiaying 2 ; Li, Shaoning 2 ; Zhao, Na 2 ; Li, Bin 2 ; Xu, Chengyang 1 ; Lu, Shaowei 2 ;

作者机构： 1.Beijing Forestry Univ, Res Ctr Urban Forestry, Beijing 100083, Peoples R China

2.Beijing Acad Agr & Forestry Sci, Inst Forestry & Pomol, Beijing 100093, Peoples R China

3.Beijing Yanshan Forest Ecosyst Res Stn, Natl Forest & Grassland Adm, Beijing 100093, Peoples R China

4.Shenyang Agr Univ, Coll Forestry, Shenyang 110161, Peoples R China

关键词： image processing; color mode; drought tolerance; color index

期刊名称：PLANTS-BASEL （ 影响因子：4.1； 五年影响因子：4.5 ）

ISSN： 2223-7747

年卷期： 2025 年 14 卷 15 期

页码：

收录情况： SCI

摘要： The context of global climate change, water stress has a significant impact on the ecological function and landscape value of urban greening shrubs. In this study, three typical greening shrubs (Euonymus japonicus, Ligustrum x vicaryi, and Berberis thunbergii var. atropurpurea) in North China were subjected to a two-year field-controlled experiment (2022-2023) with four water treatments: full irrigation, deficit irrigation, natural rainfall, and extreme drought. The key findings are as follows: (1) Extreme drought reduced the color indices substantially-the G(CC) of E. japonicus decreased by 40% (2023); the R-CC of B. thunbergii var. atropurpurea declined by 35% (2022); and the color indices of L. x vicaryi remained stable (variation < 15%). (2) Early-season soil water content (SWC) strongly correlated with the color index of E. japonicus (r(2) = 0.42, p < 0.05) but weakly with B. thunbergii (r(2) = 0.28), suggesting species-specific drought-tolerance mechanisms like reduced leaf area. (3) Deficit irrigation (SWC approximate to 40%) maintained color indices between fully irrigated and drought-stressed levels. Notably, B. thunbergii retained high redness (R-CC > 0.8) at an SWC approximate to 40%; E. japonicus required an SWC > 60% to preserve greenness (G(CC)). The research results provide a scientific basis for urban greening plant screening and water-saving irrigation strategies, and expand the application scenarios of color coordinates in plant physiological and ecological research.

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