Pollution of arable land caused by heavy metals in livestock and poultry manure has become a potential threaten to human health in China. Safe disposal of the contained toxic pollution with animal manure by co-composting with biochar is one of the alternative methods. Biochars from different sources (wheat straw, peanut shells and rice husks) amended with different loading rates were investigated for passivations of copper and zinc (Cu and Zn) in swine manure composting. Results showed that the passivation effects of the three types of biochar on Cu and Zn were enhanced with increasing biochar dose. Contents of Cu and Zn measured by diethylenetriaminepentaacetic acid (DTPA) and Community Bureau of Reference (CBR) showed that wheat straw biochar with the loading rates of 10%–13% (w/w) was superior to the other two types of biochar in this study. Compared with the control, sample from wheat straw biochar was more favorable for the bacterial growth of Proteobacteria, Firmicutes and Actinobacteria. In addition, pot experiment showed that organic fertilizer amended with wheat straw biochar could significantly improve the growth of Chinese pakchoi and enzyme activities (superoxide dismutase, peroxidase, polyphenol oxidase and catalase) as compared with the control. Cu and Zn contents of Chinese pakchoi in the organic fertilizer group containing wheat straw biochar reduced by 73.2% and 45.2%, 65.8% and 33.6%, respectively, compared with the group without loading biochar. There was no significant difference in the contents of vitamin C and reducing sugar between the groups of organic fertilizer amended with/without wheat straw biochar, however, there was significant difference compared with the heavy metal addition group. The application of organic fertilizer formed by adding biochar can effectively reduce the adverse effects of heavy metals on crops.

中文翻译：

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不同负载率和生物炭类型对猪粪堆肥钝化铜、锌的影响

畜禽粪便中重金属对耕地造成的污染已成为我国人类健康的潜在威胁。通过与生物炭共同堆肥来安全处理含有动物粪便的有毒污染是替代方法之一。研究了不同来源（小麦秸秆、花生壳和稻壳）的生物炭在不同负载率下对铜和锌（Cu 和 Zn）在猪粪堆肥中的钝化作用。结果表明，随着生物炭用量的增加，三种生物炭对Cu和Zn的钝化作用增强。通过二亚乙基三胺五乙酸（DTPA）和社区参考局（CBR）测量的 Cu 和 Zn 含量表明，小麦秸秆生物炭在 10%~13% (w/w) 的负载率下优于其他两种类型的生物炭。这项研究。与对照相比，小麦秸秆生物炭样品更利于变形菌、厚壁菌和放线菌的生长。此外，盆栽试验表明，与对照相比，添加小麦秸秆生物炭的有机肥可显着提高小白菜的生长和酶活性（超氧化物歧化酶、过氧化物酶、多酚氧化酶和过氧化氢酶）。含麦秸生物炭有机肥组小白菜Cu、Zn含量较未加生物炭组分别降低73.2%、45.2%、65.8%和33.6%。加/不加麦秸生物炭的有机肥组维生素C和还原糖含量无显着差异，但 与重金属添加组相比有显着差异。施用添加生物炭形成的有机肥，可有效降低重金属对作物的不利影响。