Effects of microplastics and biochar on soil cadmium availability and wheat plant performance
Effects of microplastics and biochar on soil cadmium availability and wheat plant performance
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DOI：
10.1111/gcbb.13083
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发表时间：
2023-07
期刊：
影响因子：
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通讯作者：
Jiarui Miao;Yalan Chen;Enyao Zhang;Yan Yang;Ke Sun;Bo Gao
中科院分区：
文献类型：
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作者：
Jiarui Miao;Yalan Chen;Enyao Zhang;Yan Yang;Ke Sun;Bo Gao
生物炭是一种很有前途的改良剂，可以促进农业土壤中镉（Cd）的吸附和固定，其中微塑料是土壤中的新兴污染物。通过温室盆栽试验，研究了生物炭和新鲜/陈化塑料微颗粒对土壤-植物系统中Cd有效性的影响。新鲜微塑料显著提高了土壤Cd的有效性和小麦对Cd的吸收，而老化微塑料增加了土壤有效态Cd，但对小麦吸收Cd没有影响，这可能与老化微塑料阻碍了Cd从土壤向小麦的转运有关。出乎意料的是，生物炭增加了镉的有效性和镉的吸收。土壤可溶性Cd的增加是由于生物炭的加入降低了土壤pH值和增加了溶解性有机质（DOM）含量。此外，不变的土壤镉吸附可能是负责增加测试土壤镉的有效性。此外，与单独使用生物炭处理的土壤相比，在向生物炭处理的土壤中添加微塑料后，土壤pH值的更大降低，土壤DOM含量的增加以及Cd吸附量的减少的综合效应导致Cd有效性的显着增加（范围从2.63%到47.73%）。新鲜微塑料对小麦生长有抑制作用，老化微塑料对小麦生长的抑制作用更强。生物质炭提高了小麦生物量，但与生物质炭相比，微塑料和生物质炭共存降低了小麦生物量，这是由于微塑料对植物生长的负面影响。
Biochar is a promising amendment to promote cadmium (Cd) sorption and fixation in agricultural soil, where microplastics are emerging contaminants in soil. Herein, a greenhouse pot experiment was conducted to elucidate the effects on Cd availability in a soil–plant system by biochar and fresh/aged microplastics application. The fresh microplastics led to an obvious increase in soil Cd availability and Cd uptake by wheat plant, while the aged microplastics increased the available Cd in soil but had no effect on Cd uptake by wheat plant, which was likely attributed to the blocking effect of the aged microplastics on Cd transportation from the soil to the wheat plant. Unexpectedly, biochar had increased Cd availability and Cd uptake. The increased soil soluble Cd was because of both decreased soil pH and elevated dissolved organic matter (DOM) content resulted by biochar addition. Also, the unchanged Cd adsorption of the soil was likely responsible for the increased tested soil Cd availability. In addition, the combined effects of a greater decrease in soil pH, an increase in soil DOM content, and a reduction in Cd adsorption after the addition of microplastics to biochar‐amended soil resulted in a significant increase (ranging from 2.63% to 47.73%) in Cd availability compared to soil treated with biochar alone. Moreover, fresh microplastics inhibited wheat growth, and greater inhibition effect was observed for their aged ones. The biochar elevated the wheat biomass; however, the coexistence of microplastics and biochar decreased the wheat plant biomass compared with biochar alone, due to the negative influence of microplastics in plant growth.