National Engineering Research Center for Efficient Utilization of Soil and Fertilizer Resources, College of Resource and Environment, Shandong Agricultural University, Taian, 271018, China.
Institute of Desertification Studies, Chinese Academy of Forestry, Beijing, 100091, China.
J Environ Manage. 2022 Feb 15;304:114193. doi: 10.1016/j.jenvman.2021.114193. Epub 2021 Dec 1.
Controlled-release fertilizer (CRF) was applied widely in China as an efficient utilization strategy for improving grain yield and reducing the nitrogen contamination. However, it was indeterminate to know the impacts of inevitably imported plastic into the soil on sustainable development. After ten-year fixed-site experiment, the visible residual coating microplastics were separated from the soil to measure their changes, then the long-term effects of CRF application (theoretical microplastic content 0.018-0.151 g kg soil) on soil architecture and bacterial communities were evaluated. Based on soil organomineral complexes (OMC) distribution experiments and soil 16S rRNA sequence analysis, residual coating microplastics had no significant impact on soil architecture and limited effects on soil bacteria, but became the specific microbial habitat. The nitrogen rate and nitrogen release mode affected sand- and silt-grade OMC, and nitrogen rate impacted soil bacteria communities. The residual coating, small inert particles, is safe for soil OMC and bacterial communities in agricultural soil. Due to the effectiveness of CRF on reducing environmental pollution, CRF is considered as a favorable measure to the sustainable agricultural development in Shandong Province, China.
控释肥（CRF）作为提高粮食产量和减少氮污染的有效利用策略，在中国得到了广泛应用。然而，不可避免地将塑料进口到土壤中对可持续发展的影响尚不确定。经过十年的固定点实验，从土壤中分离出可见的残留涂层微塑料，以测量其变化，然后评估控释肥应用（理论微塑料含量 0.018-0.151 g kg 土壤）对土壤结构和细菌群落的长期影响。基于土壤有机-矿物复合体（OMC）分布实验和土壤 16S rRNA 序列分析，残留涂层微塑料对土壤结构没有显著影响，对土壤细菌的影响有限，但成为特定的微生物栖息地。氮素率和氮释放模式影响砂粒和粉粒级 OMC，氮素率影响土壤细菌群落。残留涂层，小惰性颗粒，对农业土壤中的土壤 OMC 和细菌群落是安全的。由于控释肥在减少环境污染方面的有效性，控释肥被认为是中国山东省可持续农业发展的有利措施。
