Current mainstream agricultural carbon credit methodologies use soil organic carbon change (ΔSOC) as the basis for credit issuance without ex-ante constraints on ΔSOC itself. While this design avoids temporal mismatches between short-lived biomass carbon and long-term fossil fuel emissions—thereby ensuring credit permanence—it also creates risks arising from an unconstrained single-minded pursuit of carbon sequestration. This paper proposes the CAGB Double-Gate mechanism, grounded in the dual principles of "Carbon Self-Neutralization" and "Yield Conservation." Rather than generating carbon credits from aboveground biomass, this mechanism uses CAGB as a prerequisite ecological gate: through dual verification of operational carbon neutrality (CAGB ≥ EGHG) and yield baseline integrity (Y_t ≥ Y_0), it ensures that ΔSOC credits are issued only when a system's photosynthetic carbon fixation has neutralized its own operational emissions and the system maintains its food production capacity. The mechanism fundamentally enhances climate integrity through ex-ante screening with minimal institutional friction, providing a practical methodological supplement for Article 6.4 of the Paris Agreement, Verra VCS, Gold Standard, and China's CCER framework.
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