Forcing variables in simulation of transpiration of water stressed plants determined by principal component analysis

Autor(es)

Durigon, Angelica ; van Lier, Quirijn de Jong ; Metselaar, Klaas

• Tipo de documento: Artigo Científico
• Fonte: INTERNATIONAL AGROPHYSICS; v. 30, n. 4, p. 431-445, OCT 2016.
• Citações Web of Science: 1

Resumo

To date, measuring plant transpiration at ca-nopy scale is laborious and its estimation by numerical modelling can be used to assess high time frequency data. When using the model by Jacobs (1994) to simulate transpiration of water stressed plants it needs to be reparametrized. We compare the importance of model variables affecting simulated transpiration of water stressed plants. A systematic literature review was performed to recover existing parameterizations to be tested in the model. Data from a field experiment with common bean under full and deficit irrigation were used to correlate estimations to forcing variables applying principal component analysis. New parameterizations resulted in a moderate reduction of prediction errors and in an increase in model performance. Ag s model was sensitive to changes in the mesophyll conductance and leaf angle distribution parameterizations, allowing model improvement. Simulated transpiration could be separated in temporal components. Daily, afternoon depression and long-term components for the fully irrigated treatment were more related to atmospheric forcing variables (specific humidity deficit between stomata and air, relative air humidity and canopy temperature). Daily and afternoon depression components for the deficit-irrigated treatment were related to both atmosphe-ric and soil dryness, and long-term component was related to soil dryness. (AU)

• Processo FAPESP: 12/09316-8 - Parametrizações físicas de um modelo para a estimativa da taxa de transpiração de plantas
• Beneficiário: Angelica Durigon
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 13/19374-8 - Acoplamento de um modelo físico para a estimativa da transpiração de plantas a um modelo funcional-estrutural de plantas
• Beneficiário: Angelica Durigon
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado