Suction Variation of a Single Mature Tree on Top of Tropical Residual Soil
This paper investigates the suction variation induced by a single mature tree situated a top tropical residual soil, focusing on its impact on soil moisture content along a slope, where the tree's water uptake generates matric suction within the surrounding soil. A field monitoring program was...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Penerbit UTHM
2024
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| Subjects: | |
| Online Access: | http://umpir.ump.edu.my/id/eprint/42814/7/Suction%20Variation%20of%20a%20Single%20Mature%20Tree%20on%20Top%20of%20Tropical%20Residual%20Soil.pdf http://umpir.ump.edu.my/id/eprint/42814/ https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/16125 https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/16125 |
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| Summary: | This paper investigates the suction variation induced by a single mature tree situated a top tropical residual soil, focusing on its impact on soil moisture content along a slope, where the tree's water uptake generates matric suction within the surrounding soil. A field monitoring program was conducted to collect matric suction data at the slope with two conditions: in the absence of a tree; and with a tree located on top of a tropical residual soil slope. The variation in both matric suction values and matric suction profiles response to the tree water uptake and rainfall are investigated. Matric suction significantly increased in the vicinity of the tree on top of the slope compared to the slope without a tree. The variations of matric suction response due to climate change occur significantly at the swallow of the slope and decrease gradually with depth. The decreases of matric suction occur after a long duration of intense rainfall. This was an initial condition before the water uptake driven by the active root tree generated the maximum matric suction (low moisture content). Analyses from matric suction profiles revealed that the majority of matric suction variation were greater near tree trunks (< 4.4 m) and at shallow depths (0.25m). The contours of matric suction profiles are presented to reveal moisture flow due to tree water uptake. This investigation provides that the viewed contribution of a single mature tree significantly alters the matric suction or moisture variation distribution driven by transpiration in an unsaturated soil slope. It considers that preserving mature trees can improve soil properties in modern slope designs. |
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