1. 毕业设计（论文）的内容和要求
早在几百年前，亚马逊印第安人就会将生物炭和有机质掺入土中，创造出肥沃的黑土，今天这种木炭被称为生物炭，可用植物废料制成。
这种由植物形成的，以固定碳元素为目的的木炭被科学家们称为生物炭。
生物炭几乎是纯碳，埋到地下后可以有几百至上千年不会消失，等于把碳封存进了土壤。
2. 参考文献
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