biogeochemical
noun
bio·geo·chem·i·cal ˌbī-ō-ˌjē-ə-ˈke-mi-kəl 
: of or relating to the partitioning and cycling of chemical elements and compounds between the living and nonliving parts of an ecosystem
biogeochemistry
ˌbī-ō-ˌjē-ə-ˈke-mə-strē
noun 
Word History
First Known Use
1929, in the meaning defined above