Divergent climate feedbacks on winter wheat growing and dormancy periods as affected by sowing date in the North China Plain

Abstract. Crop phenology exerts measurable impacts on soil surface properties, biophysical processes and climate feedbacks, particularly at local or regional scales. Nevertheless, the response of to feedbacks as affected by sowing date in winter wheat croplands has been overlooked, especially during dormancy. The dynamics leaf area index (LAI), energy balance canopy temperature (Tc) were simulated a modified SiBcrop (Simple Biosphere) model under two scenarios (early sowing, EP; late LP) 10 stations North China Plain. results showed that with crop scheme well seasonal dynamic LAI, Tc, heat fluxes. An earlier had higher LAI development than later date. But Tc exhibited opposite patterns dormancy active-growth periods: EP led (0.05 K) LP period lower (?0.2 growth period. highest difference (0.6 between happened time when was sown but not LP. captured more net radiation warming effect partitioned into latent flux cooling. feedback date, which obvious northern areas growing southern areas, determined relative contributions albedo radiative process partitioning non-radiative process. study highlights land management modulating climate.