首页 | 本学科首页   官方微博 | 高级检索  
     检索      

灰色预测在桉树冻害预报中的应用
引用本文:杨韧.灰色预测在桉树冻害预报中的应用[J].北京林业大学学报,1987,9(1):95-99.
作者姓名:杨韧
作者单位:四川省绵阳市林科所
摘    要:本文应用灰色系统理论,选取历年冬季连续30天内≤0℃最大日数为低温指标,建立GM(1,1)模型,对绵阳市大叶桉冻害进行了预测。预测模型为:P(K+1)=25.1239e~(0.3645k)-23.1239后验差检验模型精度为第一级“GOOD”。预测下次灾年将在1999年出现。

关 键 词:灰色系统  大叶桉  冻害

THE CALCULATION OF GREY SYSTEM IN THE APPLICATION TO FORECAST OF FREEZE INJURY OF TREES
Yang Ren.THE CALCULATION OF GREY SYSTEM IN THE APPLICATION TO FORECAST OF FREEZE INJURY OF TREES[J].Journal of Beijing Forestry University,1987,9(1):95-99.
Authors:Yang Ren
Abstract:The most days within 30 days≤0℃ in every winter has been chosen as a low temperature target and the model GM (1, 1) has been set up to calculate the freeze injury of Eucalyptus robusta Smith in Mia-nyang by the Theory of Grey System. The calculation model is P(1) (K + 1) = 25.1239e0.3645K-23.1239. And the precision of the model is grade A. "Good" .According to the calculation of Grey System, next disaster willappear after 14 years (1999)
Keywords:Grey system  Eucalyptus robusta Smith  freeze injury  
本文献已被 CNKI 维普 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号