文献类型：期刊文献

英文题名：Spatio-Temporal Variation of Soil Microplastics as Emerging Contamination After Application of Organic Mulching in Phyllostachys violascens Forests

作者：Li, Shuwei[1,2] Guo, Ziwu[1] Chen, Shuanglin[1] Fan, Lili[1] Yu, Wenxian[3] Wang, Weiyu[4]

第一作者：Li, Shuwei

通信作者：Fan, LL[1]

机构：[1]Chinese Acad Forestry, Res Inst Subtrop Forestry, Hangzhou, Peoples R China;[2]Nanjing Forestry Univ, Bamboo Res Inst, Nanjing, Peoples R China;[3]Fuyang Dist Agr & Forestry Resource Management Ctr, Hangzhou, Peoples R China;[4]Linan Dist Agr & Forestry Technol Extens Ctr, Hangzhou, Peoples R China

年份：2025

外文期刊名：LAND DEGRADATION & DEVELOPMENT

收录：;EI(收录号：20253819208005);Scopus(收录号：2-s2.0-105016518930);WOS:【SCI-EXPANDED(收录号:WOS:001575169400001)】；

基金：This work was supported by Fundamental Research Funds of CAF (no. CAFYBB2023MA004) and Cooperation of Zhejiang Province and the Chinese Academy of Forestry (no. 2024SY13).

语种：英文

外文关键词：contamination characteristics; mulching duration; Phyllostachys violascens forests; risk assessment; soil microplastics; urban proximity

摘要：Microplastics (MPs) are emerging contaminants of increasing concern in terrestrial ecosystems, yet their distribution patterns and ecological risks in bamboo forest soils remain underexplored. We investigated MPs contamination in experimental Phyllostachys violascens forests under different urban proximity (suburban vs. exurban) and mulch durations (none, short-term, and long-term). MPs abundance, morphology, and polymer composition were analyzed across three soil depths (0-10, 10-20, and 20-40 cm) and correlated with soil properties. Ecological risks were assessed using potential ecological risk index (H) and pollution load index (PLI). The results were: MPs abundance varied significantly with urban proximity and mulching duration, with the highest levels observed in exurban and short-term mulched stands. Vertical distribution showed an initial increase followed by a decline with depth. MPs were mainly granular, gray in color, and primarily composed of polymethyl methacrylate and polyethylene terephthalate. Increased distance from urban centers and longer mulching durations led to reduced diversity in MPs morphology and polymer types, and a shift toward smaller particle sizes (50-100 mu m), particularly in short-term mulched plots. MPs particle size was negatively correlated with the proportion of soil microaggregates (p < 0.05), whereas polymer types showed significant positive correlations with soil pH, total nitrogen, hydrolyzable nitrogen, total potassium, and large aggregate proportion (p < 0.05), indicating that soil properties influence MPs distribution and composition. PLI and H indexes indicated moderate MPs contamination, corresponding to ecological risk levels III-IV in all sampling sites. Overall, mulched Ph. violascens plantations exhibit moderate MPs contamination, with elevated ecological risks in exurban areas and under short-term mulching. These findings provide insights for targeted mitigation strategies and improved management of MPs contamination in bamboo forest ecosystems.