期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 812, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2021.151487
关键词
Soil aggregates; Soil nutrient cycling; Combined effects; Plant growth; Adsorb
资金
- Program for the National Natural Science Foundation of China [51879101, 51579098, 51779090, 51709101, 51521006, 51809090, 51809293, 52109083]
- National Program for Support of Top-Notch Young Professionals of China (2014)
- Program for Changjiang Scholars and Innovative Research Team in University [IRT-13R17]
- Hunan Provincial Science and Technology Plan Project [2018SK20410]
- Science and Technology Innovation Program of Hunan Province [2020RC4014]
- Natural Science Foundation of Hunan Province, China [2021JJ40100]
This review discusses the direct and indirect effects of microplastics on the soil-plant system, focusing on soil aggregates, soil nutrient cycling, and the combined effects of microplastics and other pollutants. Microplastics can affect plant rooting ability and photosynthetic rate, as well as soil aggregate stability and nutrient cycling. Different types, sizes, and concentrations of microplastics have varying effects on the soil-plant system.
The effect of microplastics on soil ecosystem is a hot topic in recent years. It is increasingly recognized that soil is also an important sink for microplastics in addition to the aquatic environment. This review aims to discuss the direct and indirect effects of microplastics on the soil-plant system, focusing on the effects of microplastics on soil aggregates and soil nutrient cycling as well as the combined effects of microplastics and other pollutants on soil plant systems. Microplastics have been shown to affect the rooting ability of plants by altering soil bulk density and water-holding capacity, as well as reducing photosynthetic rate by directly interfering with the balance of plant chlorophyll a/chlorophyll b ratios. In addition, microplastics affect the stability of aggregates by interfering with abiotic factors (e.g., sesquioxide and exchangeable cations) or biotic factors (e.g., soil organic matter and organism activities in the soil). Moreover, microplastics may affect soil nutrient cycling by altering the dominant bacteria phyla in the soil or genes and enzymes associated with the carbon, nitrogen, and phosphorus cycle. When microplastics and other pollutants have combined effects on plants, microplastics attached onto the root surface physically hamper the contact of the pollutants with the roots but are more likely to exacerbate the damage of pollutants to plants. Different types, sizes and concentrations of microplastics have different effects on the soil-plant system. Microplastics with similar shape and size to soil particles have less significant effects, while microfibers, small-sized microplastics and biodegradable plastic particles have more significant effects. Finally, this review also provides an outlook for future research. (c) 2021 Published by Elsevier B.V.
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