Modelling carbon and water balance of Eucalyptus plantations at regional scale: Effect of climate, soil and genotypes

编号 010021103

推送时间 20191104

研究领域 森林生态 

年份 2019 

类型 期刊 

语种 英语

标题 Modelling carbon and water balance of Eucalyptus plantations at regional scale: Effect of climate, soil and genotypes

来源期刊 Forest Ecology and Management

期 第211期

发表时间 20191001

关键词 Eucalyptus plantations;  Ecophysiological model;  G’DAY;  Optimization;  Productivity; 

摘要 Carbon and water budgets of forest plantations are spatially and temporally variable and hardly empirically predictable. We applied G’DAY, a process-based ecophysiological model, to simulate carbon and water budgets and stem biomass production of Eucalyptus plantations in S?o Paulo State, Brazil. Our main objective was to assess the drivers of spatial variability in plantation production at regional scale. We followed a multi-site calibration approach: the model was first parameterized using a detailed experimental dataset. Then a subset of the parameters were re-calibrated on two independent experimental datasets. An additional genotype-specific calibration of a subset of parameters was performed. Model predictions of key carbon-related variables (e.g., gross primary production, leaf area index and stem biomass) and key water-related variables (e.g., plant available water and evapotranspiration) agreed closely with measurements. Application of the model across ca. 27,500?ha of forests planted with different genotypes of Eucalyptus indicated that the model was able to capture 89% of stem biomass variability measured at different ages. Several factors controlling Eucalyptus production variability in time and space were grouped in three categories: soil, climate, and the planted genotype. Modelling analysis showed that calibrating the model for genotypic differences was critical for stem biomass prediction at regional scale, but that taking into account climate and soil variability significantly improved the results. We conclude that application of process-based models at regional scale can be used for accurate predictions of Eucalyptus production, provided that an accurate calibration of the model for key genotype-specific parameters is conducted.

服务人员 王璐

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