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Dynamic Ecological Stoichiometric Characteristic Values of Lettuce Leaves Under Different Fertility Levels
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DOI：10.3390/horticulturae12081005.png)
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Abstract
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This study analyzed the dynamic variation in leaf ecological stoichiometry of lettuce during the whole growth period under the two different fertility levels, and explored the potential application of ecological stoichiometry theory for precise fertilization management of lettuce under the evaluated experimental condition. Taking the two critical leaf ages of 10.39 and 24.25 as dividing points, the growth process of lettuce can be divided into three stages: the initial slow growth stage—S1, mid-rapid growth stage—S2, and subsequent slow growth stage—S3. With plant growth, the contents of carbon (C) and nitrogen (N) in leaves kept increasing, while phosphorus (P) content showed a trend of rising first and then decreasing. The leaf C:N ratio declined steadily, and the C:P and N:P ratios decreased first and then increased. Most stoichiometric indicators exhibited significant differences among different growth stages (p < 0.05). Compared with the medium fertility level treatment, the aboveground biomass of lettuce under the higher fertility level treatment slightly increased, but the contents of C, N, and P in leaves all decreased, and no significant differences in various ecological stoichiometric indicators were observed between the two fertility level treatments (p > 0.05). The dynamic variation patterns of leaf C, N, and P contents and their stoichiometric ratios of the tested lettuce under the designed experimental conditions were consistent with the Homeostasis Theory and Allometric Growth Theory of ecological stoichiometry. Based on the above results, this study established ecological stoichiometric reference criteria suitable for dynamic nutrient regulation of lettuce. Collectively, the present findings not only established targeted ecological stoichiometric reference criteria for dynamic nutrient regulation of the lettuce cultivar used in the study under the tested fertility conditions, but also this research idea may be extended to nutrient regulation of other lettuce cultivars or other crop species.
Keywords:
ecological stoichiometric characteristics
homeostasis theory
allometric growth theory
nutrient regulation
lettuce
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