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Field monitoring of suction in the vicinity of an urban tree: exploring termite infestation and the shading effects of tree canopy

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Abstract

The objective of this short communication is to explore spatial distribution of soil suction in the vicinity of an urban tree considering effects of termite infestation and also radiant energy interception by canopy. A site in an urban landscape containing a mix of species cover (grass cover in the vicinity of trees) was selected for monitoring. A field monitoring program was designed to monitor soil (soil suction, moisture), vegetation parameters (tree height, grass leaf area), and meteorological parameters during drying/wetting cycles. As expected, before termite infestation, suction magnitude and rate of change were highest near the tree stem and at shallower depths, reflecting the dominance of transpiration over evaporation. However, after termite infestation, soil suction diminished significantly near the tree stem and increased farther from the tree stem, a phenomenon accompanied by loss of canopy area, as captured by a color analysis technique (i.e., an image processing method). These findings reflected a reduction in stomatal conductance, itself an indicator of transpiration loss through the stomata—likely because reduced canopy shading effects caused increased evaporation. Soil suction at deeper depths seemed not to be significantly affected, generally due to canopy and termite infestation. In summary, the study sheds new light on issues of tree maintenance by showing how termite infestation can significantly affect the performance of green infrastructure.

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Acknowledgements

The authors gratefully acknowledge financial support from the University of Macau Research Fund (MYRG2018-00173-FST; MYRG2015-00112-FST) and the Macau Science and Technology Development Fund (FDCT) (Code: 193/2017/A3). The authors would also like to thank Shantou University Scientific Research Fund (NTF17007) for support.

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Authors and Affiliations

  1. State Key Laboratory of Internet of Things for Smart City and Department of Civil and Environmental Engineering, University of Macau, Macau S.A.R., China

    Wan-Huan Zhou

  2. Department of Civil and Environmental Engineering, Faculty of Science and Technology, University of Macau, Macau, China

    Shu-Yu He

  3. Department of Civil and Environmental Engineering, Shantou University, Shantou, 515063, Guangdong, China

    Ankit Garg

  4. Department of Civil and Environmental Engineering, Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China

    Zhen-Yu Yin

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  1. Wan-Huan Zhou
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Correspondence to Ankit Garg.

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Zhou, WH., He, SY., Garg, A. et al. Field monitoring of suction in the vicinity of an urban tree: exploring termite infestation and the shading effects of tree canopy. Acta Geotech. 15, 1341–1361 (2020). https://doi.org/10.1007/s11440-019-00810-0

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