Development of two-leaf photosynthetic model sensitive to chlorophyll
content and its couple with wheat growth model
Abstract
Crop growth model simulates the response of photosynthetic rate to
nitrogen (N) dynamic by calculating critical N concentration. However,
critical N concentration cannot describe the physiological effect of N
dynamic to photosynthesis. In this paper, a Two-leaf Photosynthetic
Model Sensitive to Chlorophyll Content (TPMSCC) was developed and
coupled with the crop growth model (WheatGrow) to improve the mechanism
of N dynamics on photosynthesis. The simulating results of TPMSCC
revealed the high sensitivity of LCC on photosynthesis. The
relationships of LCC to the maximum photosynthetic rate (A
max) and the initial light use efficiency (ɑ) simulated
by TPMSCC were linear and logarithmic. In addition, canopy
photosynthetic rate benefited from the increase of diffuse radiation
fraction (DRF) except for the condition of dense canopy at high solar
zenith angle. The optimized WheatGrow performed better than WheatGrow on
describing the response of N level on biomass accumulation and
distribution in different organs.