请按照nature发文翻译下面句子包括结构逻辑语言：然而本研究在秸秆改良剂中添加了Biological bacteria gkg和PAM gkg有助于激发土壤微生物的活性从而提高土壤碳。

However, this study has added Biological bacteria (g/kg) and PAM (g/kg) to the straw amendment, which helps to stimulate the activity of soil microorganisms, thereby increasing soil carbon. The sentence is structured in a complex way with a main clause "this study has added Biological bacteria and PAM to the straw amendment" and a subordinate clause "which helps to stimulate the activity of soil microorganisms, thereby increasing soil carbon." The logical connection between the two clauses is that the addition of Biological bacteria and PAM has a beneficial effect on the soil microorganisms, resulting in an increase in soil carbon. The language used is technical and precise, using scientific terminology such as "soil microorganisms" and "soil carbon."