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https://doi.org/10.5194/bg-2020-388
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-2020-388
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  20 Nov 2020

20 Nov 2020

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This preprint is currently under review for the journal BG.

Divergent climate feedbacks in the growing period and the dormancy period to sowing date shift of winter wheat in the North China Plain

Fengshan Liu1,2, Ying Chen1, Nini Bai1, Dengpan Xiao4, Huizi Bai4, Fulu Tao2,3, and Quansheng Ge2,3 Fengshan Liu et al.
  • 1China National Engineering Research Center of JUNCAO Technology, Forestry College, Fujian Agriculture and Forestry University, Fuzhou 350002, China
  • 2Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
  • 3College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
  • 4Institute of Geographical Sciences, Hebei Academy of Sciences, Shijiazhuang 050011, China

Abstract. The land cover and management changes have strong feedbacks to climate through surface biophysical and biochemical processes. Agricultural phenology dynamic exerted measurable impacts on land surface properties, biophysical process and climate feedback in particular times at local/regional scale. But the responses of climate feedback through surface biophysical process to sowing date shift in the winter wheat ecosystem have been overlooked, especially at winter dormancy period. Considering the large cultivation area, unique surface property and phenology shift of winter wheat in the North China Plain, we first validated the SiBcrop model. Then, we used it to investigate the dynamics of leaf area index (LAI) and canopy temperature (Tc) under two planting date scenarios (Early Sowing: EP; Late Sowing: LP) of winter wheat at 10 selected stations. Finally, the surface energy budget was analyzed and interpreted. The results showed that the SiBcrop with a modified crop phenology scheme better simulated the seasonal dynamic of LAI, Tc, phenology, and surface heat fluxes. Earlier sowing date had higher LAI with earlier development than later sowing date. But the response of Tc to sowing date exhibited opposite patterns during the dormancy and active growth periods: EP led to higher Tc (0.05 K) than LP in the dormancy period and lower Tc (−0.2 K) in the growth period. The highest difference (0.6 K) between EP and LP happened at the time when wheat was sown in EP but wasn't in LP. The higher LAI captured more net radiation with lower surface albedo for warming, whist surface energy partitioning exerted cooling effect. The relative contributions of albedo-radiative process and partitioning-non-radiative process determined the climate effect of sowing date shift. The spatial pattern of the climate response to sowing date was influence by precipitation and air temperature. The study highlight that the climate effects of the sowing date shift in winter dormancy period are worthy of attention.

Fengshan Liu et al.

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Short summary
The sowing date is the key to the surface biophysical processes in winter dormancy period. The climate effect of sowing date shift is therefore very interesting and may contributed to the mitigation of climate change. Earlier sowing date always had higher LAI, but higher temperature in the dormancy and lower temperature in the growth period. The main reason was the relative contributions of surface albedo process and energy partitioning process.
The sowing date is the key to the surface biophysical processes in winter dormancy period. The...
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