作物养分定量化模型原理及方法比较分析

本文比较分析了养分经验模型和动态模拟模型的原理和计算方法。比较典型的经验模型有肥料效应函数方程,目标产量法,以及基于土壤肥力指标的QUEFTS(QUantitative Evaluation of the Fertility of Trop ical Soils)养分模型等。经验模型的特点是简单易行,所需参数少,但模拟精度难免误差较大;动态模拟模型由于考虑到复杂因素对作物养分吸收的影响,以及植物营养的动态过程,更能反映的系统真实行为。然而,由于土壤养分运移和作物养分吸收过程的复杂性,目前除氮外,还很难做到其它养分的动态定量化模拟,这些都还有待于更深入的基础性研究。

Comparison of the Principle and Methods to Quantify Crop Nutrient Models

The difference of principle and methods between the empirical and dynamic simulation nutrient models was analyzed in this paper.The typical empirical nutrient models,such as fertilizer effect functions,yield targeted model,and model QUEFTS(QUantitative Evaluation of the Fertility of Tropical Soils),which based on soil chemical fertility indices and fertilizer recovery,are easy to be run but show much more errors.Dynamic models can reflect nutrient flow in real systems because more factors are considered and simulated.But,due to the complexity of nutrient transportation and absorption,it's difficult to quantitatively simulate the dynamic nutrient processes except Nitrogen at present.However,application of dynamic models would be a common way,so,it challenges us to realize the nutrient modeling in the future.