The additional fibres induce pores due to reduced dispersion efficiency.

是的，reduced是过去分词，在这里被用作形容词。类似的用法如：

Due to increased demand, another six thousand copies are to be printed. 由于需求量增加，将再加印六千册。

Many species of animals and plants have been put out of existence due to complicated reasons. 由于复杂的原因许多动植物物种已经灭绝。