Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. carbon cycle 059QF0KO0R 7440-44-0 Carbon Humic Substances Meta-Analysis Review Water climate change global change land surface temperatures microbial physiology nitrogen cycle priming effects soil biogeochemical model soil carbon classification soil carbon stabilization soil organic carbon soil organic matter soil physicochemical property surface energy fluxes tropical vegetation vegetation water stress water cycle