Unseen threat: The devastating impact of microplastics on soil health in agricultural lands
Küçük Resim Yok
Tarih
2025
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Microplastic pollution, originating from synthetic polymer materials, is a growing environmental threat with substantial implications for soil health and ecosystem functionality. This study investigates the accumulation and impacts of microplastics from plastic greenhouse covers on agricultural soils. Soil samples were collected from five greenhouses established 10 to 30 years ago, at a depth of 0-30 cm, to evaluate microplastic contamination levels and their impact on soil parameters. Microplastics were extracted using density separation with a saturated NaCl solution, followed by microscopic analysis for quantification. Enzyme activities, including beta-glucosidase, beta-galactosidase, beta-glucoaminidase, urease, dehydrogenase (DHG), and catalase, were measured using spectrophotometric and colorimetric assays. Microplastic concentrations ranged from 47 to 315 particles per 5 g of soil, with a progressive increase in concentration linked to the age of the greenhouses. Results revealed significant alterations in soil pH, which ranged from 7.58 to 8.04, and electrical conductivity (EC), varying between 192 and 616 mu S cm(-1). Organic carbon (0.68-0.59 %) and total nitrogen (0.07-0.03 %) contents decreased in soils with increasing microplastic concentrations, while microbial biomass carbon (Cmic) and nitrogen (Nmic) decreased by 43.75 % and 46.59 %, respectively. Enzyme activities such as beta-glucosidase, beta-galactosidase, and beta-glucosaminidase declined by up to 51.17 %, 30.90 %, and 28.31 %, respectively. Additionally, soil respiration (CO2-C emissions) increased by 73.91 % (0.19 to 0.33 mg CO2-C kg(-1) soil h(-1)), and the metabolic quotient (qCO(2)) rose by 239.82 % (1.41 to 4.82 mg CO2-C g(-1) Cmic h(-1)). Regression analyses demonstrate strong correlations between microplastic concentrations and soil property changes, with a one-unit increase in microplastic concentration leading to significant decreases in enzyme activities (p < 0.05). Additionally, long-term microplastic accumulation altered soil structure, increasing porosity and aggregate instability, which compounded the reduction in enzyme activities. These findings underscore the profound negative effects of microplastic pollution on soil ecosystems, emphasizing the urgent need for sustainable agricultural practices and effective waste management strategies to mitigate microplastic contamination and its detrimental impact on soil health and functionality.
Açıklama
Anahtar Kelimeler
Agricultural pollution; Environmental impact; Greenhouse agriculture; Microplastics; Soil enzyme activity; Soil health
Kaynak
Catena
WoS Q Değeri
N/A
Scopus Q Değeri
Cilt
253
