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Determinants of environmental changes in human-modified ecosystems: effects of plastics on moisture gradients, nutrients, and clay properties
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Determinants of environmental changes in human-modified ecosystems: effects of plastics on moisture gradients, nutrients, and clay properties

Author(s): Jean Claude Ndayishimiye,   Jacqueline Nyirajana,   Pascaline Nyirabuhoro,   Patrick Irakoze Nacumuyiki,   Akinwale Oladotun Coker,   Folake Olubunmi Akintayo,   Yuri Mazei,   Damir Saldaev,   François Nkinahamira,   Théogène Habumugisha,   Theophile Murwanashyaka,   Valens Hishamunda,  

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Title First Author Publication Year
Determinants Of Environmental Changes In Human-modified Ecosystems: Effects Of Plastics On Moisture Gradients, Nutrients, And Clay Properties Jean Claude Ndayishimiye 2024

First Author Jean Claude Ndayishimiye
Abstract

Plastic pollution poses a significant threat to ecosystem health worldwide. This study examines the determinants of environmental changes in human-modified ecosystems through a quantitative-qualitative system dynamics modeling approach: field experiments conducted on a 310 m2 unsaturated clay-rich bed and a 2.5 m2 clay-rich shore of a plastic-impacted pond in Shenzhen, China, and a 1.17 ha plastic-impacted clay pit in Musanze, Rwanda; laboratory experiments involving Modified Proctor (MP) and California Bearing Ratio (CBR) tests on natural clay reinforced with polyethylene terephthalate (PET) microplastics, with diameters ranging from 0.25 to 5 mm and at concentrations of 1.25 %, 2.5 %, 3.75 %, 5 %, and 10 % by weight of clay; and plastic dynamic flows analyzed by modeling the life cycle of PET. Field experiments showed that mulch type and thickness were critical factors influencing crack distribution in a plastic-impacted pond bed. Specifically, cracks were dominant in areas with pronounced desiccation and lacking filamentous green algae and PET-dominated plastic waste. Along the 2.5 m moisture gradient in a plastic-impacted pond bed, temperature and moisture significantly influenced nutrients, particularly in pronounced desiccation zones. Laboratory experiments showed that microplastics altered the structural properties of natural clay, decreasing moisture content while increasing dry density and load-bearing capacity. The plastic life cycle underscored the roles of industrial and consumer practices, environmental conditions, and waste management and recycling inefficiencies in driving environmental changes in human-modified ecosystems. The findings underscore the need for effective plastic waste management and recycling to mitigate the ecological impacts of plastic pollution in ecosystems.

Authors Jean Claude Ndayishimiye,   Jacqueline Nyirajana,   Pascaline Nyirabuhoro,   Patrick Irakoze Nacumuyiki,   Akinwale Oladotun Coker,   Folake Olubunmi Akintayo,   Yuri Mazei,   Damir Saldaev,   François Nkinahamira,   Théogène Habumugisha,   Theophile Murwanashyaka,   Valens Hishamunda,  
Page Number e38738
Volume: 10
Pub Year: 2024
ISBN: ... ...
Pub Name: Heliyon
The full text link: https://doi.org/10.1016/j.heliyon.2024.e38738
Citation:

Ndayishimiye, J.C., Nyirajana, J., Nyirabuhoro, P., Nacumuyiki, P.I., Coker, A.O., Akintayo, F.O., Mazei, Y., Saldaev, D., Nkinahamira, F., Habumugisha, T. and Murwanashyaka, T., 2024. Determinants of environmental changes in human-modified ecosystems: Effects of plastics on moisture gradients, nutrients, and clay properties. Heliyon 10,e38738.



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