ZENG Sidong, XIA Jun, DU Hong, CHEN Xiangdong

Abstract: The key process of ecohydrology is the coupling of water and carbon cycles controlled by stomatal behavior of vegetation, which links the land surface hydrological and ecological processes, and affects the balance among water, energy and carbon. Developing a bidirectional coupled model is significant for the investigation of the interactions of land surface ecohydrological processes. In this study, the Distributed Time Variant Gain Model(DTVGM) is improved with the major modules of water and energy processes,photosynthesis,vegetation dynamics and then coupled with the Carnegie-Ames-Stanford Approach Carbon Nitrogen Phosphorous (CASACNP) biogeochemical model, which forms a bidirectional coupled ecohydrological model. Then the model framework, coupling simulation and model theory and method are proposed. The model could be a basis for land surface hydrological and biogeochemical simulations.

Keywords: ecohydrology; DTVGM; CASACNP; model theory; bidirectional coupling