Journal
SCIENTIA HORTICULTURAE
Volume 323, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scienta.2023.112511
Keywords
Field; Soil nitrogen; Canopy volume; Aboveground biomass; Allometric growth model; Stem diameter
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This study investigated the interaction between nitrogen fertilization and accumulated temperature in the growth of evergreen citrus trees. The results showed that nitrogen fertilization had minimal effects on the aboveground biomass distribution, while accumulated temperature had a significant positive correlation with canopy volume, stem diameter, and total aboveground biomass. An allometric growth model was established to provide a quantitative relationship between accumulated temperature and growth.
Tree growth is influenced by both, the availability of nutrients in the soil and temperature. However, how the interaction of nitrogen (N) fertilization and accumulated temperature (>= 10 degrees C) determines the growth of evergreen citrus trees is still unknown. To characterize this interaction, we studied the biomass distribution of young citrus trees in a four-year field experiment (2018-2021, Chongqing city, China) and used the results to build an allometric growth model. Based on a completely randomized block design (Two-way ANOVA and Duncan ' s test), three N levels were established, namely, N0 (no N fertilizer), N1 (80 % of the farmer's usual fertilization), and N2 (farmer's usual fertilization). Our results indicate that excessive N fertilizer application increases the inorganic N content in deep soil, whereas the aboveground biomass distribution was largely dependent on tree age, but independent of N fertilization. An allometric growth model of citrus aboveground biomass was established at different N levels and provided a realistic quantitative relationship between accumulated temperature and growth. It indicates that canopy volume (power function), stem diameter (linear function) and total aboveground biomass (exponential function) are highly positively correlated with accumulated temperature, rather than N fertilization. Since the canopy volume and total aboveground biomass are also significantly positively correlated with stem diameter, this parameter seems to be suitable for estimating the biomass of young citrus trees in the field. Further research is required to characterize the relationship between growth of citrus trees and other environmental factors.
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