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- W1985701787 abstract "Summary A canopy N distribution model optimizing photosynthesis was combined with mechanisms for senescence and N resorption to predict canopy leaf area index (LAI) development as a function of canopy nutrient content, N c . Shedding of leaves at the bottom of the canopy was initiated when it increased canopy photosynthesis, through resorption and redistribution of N from lost leaves. The amount of N resorbed was modelled as a fraction ( Rf ) of the N in the leaf prior to senescence. For a fixed N c , the LAI at which leaf shedding was initiated was calculated for different Rf s for canopies of Amaranthus cruentus , Glycine max , Oryza sativa and Sorghum bicolor . Predicted LAIs exceeded optimal LAIs estimated without leaf shedding and N resorption. LAI increased with increasing Rf . For all four species, the model closely predicted the observed LAIs with Rf = 0·7. Area‐based resorption efficiency increased and litter N concentration decreased with increasing LAI and average canopy N concentration (mol N m −2 leaf). A reduction of Rf , e.g. in response to increased soil N availability, decreases resorption efficiency. The model provides a mechanistic basis for interpreting plant nutrient–resorption–LAI relations." @default.
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- W1985701787 date "2002-12-01" @default.
- W1985701787 modified "2023-10-18" @default.
- W1985701787 title "Leaf senescence and resorption as mechanisms of maximizing photosynthetic production during canopy development at N limitation" @default.
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- W1985701787 doi "https://doi.org/10.1046/j.1365-2435.2002.00674.x" @default.
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