These services depend on ecosystem processes, such as biomass production and organic matter decomposition,which are on their turn dependent on biodiversity.
on their turn是指轮到他们了 在这句话中的意思是指代biomass production and organic matter decomposition之类的ecosystem processes 这句话的翻译是:这些服务取决于生态系统过程,例如生物质生产和有机物分解,而这些过程又取决于生物多样性。 服务取决于生态系统过程,过程取决于生物多样性。 你可以理解为:当轮到讨论这些过程时,他们又取决于生物多样性了。