Magnetic energy dissipation and electron energy transfer in distinct sub-regions within the magnetic reconnection diffusion region

Magnetic reconnection efficiently converts magnetic energy into plasma kinetic energy. With magnetic free energy stored in the current layer, previous numerical simulation studies, which focused on fixed localized regions surrounding X-lines, have demonstrated that the released magnetic energy is primarily converted into enthalpy flux and redirected Poynting flux. Electron acceleration has been widely observed in the separatrix, current layer, and exhaust. However, a quantitative analysis of how individual physical terms characterize energy transfer across distinct regions and evolutionary stages remains lacking. Using full-particle simulations of single-X-line reconnection, we dynamically partition the reconnection domain into the inflow region (IR), separatrix region (SR), electron current layer (ECL), and exhaust region (ER) based on naturally occurring physical boundaries. Our results show that: 1. During antiparallel reconnection, the magnetic energy in the ECL remains nearly constant, where dissipation is balanced by inflow injection; in guide-field reconnection, the ECL exhibits a net magnetic energy increase. 2. Although the ECL features the highest energy conversion power density, the SR and ER together dominate the integrated energy conversion over the analyzed reconnection process. The introduction of a guide field reduces the fractional contribution of energy conversion within the ECL. 3. Compared with other sub-regions, the ECL channels a larger fraction of converted magnetic energy to electrons. The presence of a guide field elevates the global fraction of electron energy gain across the entire reconnection diffusion region. This work explicitly quantifies the contribution distribution of various conversion and transport terms to the energy budget in each sub-region, establishing a new quantitative framework for understanding energy release during magnetic reconnection.