Simple models for stomatal conductance derived from a process model: cross-validation against sap flux data
Simple models for stomatal conductance derived from a process model: cross-validation against sap flux data
复制标题
DOI：
10.1111/j.1365-3040.2012.02515.x
复制
发表时间：
2012-09-01
影响因子：
7.3
通讯作者：
Adams, Mark A.
中科院分区：
文献类型：
--
作者：
Buckley, Thomas N.;Turnbull, Tarryn L.;Adams, Mark A.
气孔生理的植物-大气气体交换模型的代表是最小的，直接应用程序为基础的模型是有限的参数估计的困难。我们推导出简单的模型气孔导度从最近的过程为基础的模型，并交叉验证他们对测量的树液流量（176365天的长度）在36个单独的树木的两个年龄段的两个桉树品种在7个地点在澳大利亚东南部的山区。导出的模型，这是由辐照度和蒸发的需求，并有两个到四个参数，代表的总和和产品的生物物理参数的过程模型再现了中位数8389%的半小时和日平均树液流量的观测方差，并进行类似的拟合是否使用随机样本的所有数据或使用1个月的数据从春季或秋季。我们的简单模型在预测植物用水方面是一个进步，因为它们的参数与减少的过程和特性明显相关，从而能够轻松适应有关这些参数如何响应环境变化以及物种间差异的改进知识。
Representation of stomatal physiology in models of plant-atmosphere gas exchange is minimal, and direct application of process-based models is limited by difficulty of parameter estimation. We derived simple models of stomatal conductance from a recent process-based model, and cross-validated them against measurements of sap flux (176365 d in length) in 36 individual trees of two age classes for two Eucalyptus species across seven sites in the mountains of southeastern Australia. The derived models which are driven by irradiance and evaporative demand and have two to four parameters that represent sums and products of biophysical parameters in the process model reproduced a median 8389% of observed variance in half-hourly and diurnally averaged sap flux, and performed similarly whether fitted using a random sample of all data or using 1 month of data from spring or autumn. Our simple models are an advance in predicting plant water use because their parameters are transparently related to reduced processes and properties, enabling easy accommodation of improved knowledge about how those parameters respond to environmental change and differ among species.