考虑土壤水分影响的小麦根、冠干物质积累及其相互关系模型

以作物生长动力学理论为基础,提出了一种可以考虑土壤水分影响和根、冠相互作用的小麦生长模型。经与实测的小麦根、冠干物质积累动态相比较,模拟与实测值吻合良好,在0.01置信水平下达到极显著相关,说明本文所建模型结构是合理的。将模型应用于土壤水影响冬小麦根、冠关系的动态模拟,模拟结果显示:在分蘖期,无论1m土体贮水量如何,根、冠之间几乎都呈直线关系;在孕穗期,无论水量多少,根、冠关系都是先促进后抑制;而在抽穗期,当水量充足时,冠对根起促进作用,当水量不足时,冠对根先促进后抑制;拔节期是冬小麦的水分临界期,灌水既可促进作物生长,又可提高水分利用效率。模拟结果与试验所得规律基本一致,表明模型具有一定的实际意义。

Soil water-integrated dry matter accumulations in roots and shoots and their mutual relations

On the basis of the theory about the kinetics of crop growth, this paper develops a model to express soil water-integrated dry-matter accumulations in roots and shoots, and their mutual relations. It compares the simulated and actually measured accumulations of dry matter in roots and shoots, illustrating that the simulated and actually measured values tally with each other and significantly correlate with each other at p=0.01, which proved the model presented by the paper reasonable and logical. This model is used to dynamically simulate the water-integrated relation between the roots and shoots of winter wheat and the simulation reveals that the relation is linear at the tillering stage, no matter how much water there is in 0~1.0 m soil; the relation is mutually contributive at first and then mutually inhibitory at the booting stage, no matter how much water there is; and at the heading stage, the shoots promote the roots where soil water is sufficient and the shoots first promote and then inhibit the roots where soil water is deficit. These simulation results are consistent with the actually measured ones, which demonstrates that the model have certain practical significance.