A Process and Component-Based Wheat Growth Simulation System

摘要

An ecophysiological processes-based wheat growth simulation model, WheatGrow, was developed with object-oriented and component programming for control of the data base and interface management so to make simulation system modular, general, accurate and user-friendly. In the WheatGrow model, physiological development time (PDT) was used as the development scale to predict the different apical development stages and phenology. The linear relationships between PDT and apical primordium dynamics were quantified to model the shoot apical development. Partitioning indexes of shoot, leaf and ear were developed to simulate dry matter distribution among organs. From the soil water balance submodel, water stress factors were formulated to simulate the effects of water logging and drought on growth progresses. From the N, P, K dynamic submodels, nutrient stress factors were developed to simulate the effects of different N, P, K levels. The WheatGrow was widely tested using a number of data sets from different locations, years, sowing dates, varieties and fertilizers with good reliability and applicability.