摘要
本文在给出两个Ｌｏｇｉｓｔｉｃ改进模型，并用改进单纯形法对改进模型以及Ｌｏｇｉｓｔｉｃ方程的参数进行优化的基础上，探讨了卫闽光皮桦种群的胸面积增长规律，指出了卫闽光皮桦胸面积最大增长速度的径级范围在１５～２０ｃｍ。另外，模型的相似系数均超过９９．８％表明，改进模型与Ｌｏｇｉｓｉｔｃ模型一样，对卫闽光皮桦种群优势度增长动态的反映较为理想，同时对植物生物量研究也具有一定的参考价值。
This paper discussed the increasing regulation of Weiming Betula Luminifera species communities' chest square and pointed that the stem level of Weiming Betula Luminifera pecies communities' maxim increasing speed ranges from 15cm to 20cm,based on the optimization of the improved model and the Logistic equation's parameter with the Modified Simples Method.Besides,the models' resemble parameter is more than 99.8% which shows,as the Logistic model,the improved model's reaction to the increasing trends of Weiming Betula Luminifera species communities' advantageous degree is relatively ideal and it also has some reference value on the research of plant' biological quantity.
出处
《山东农业大学学报（自然科学版）》
CSCD
1998年第4期465-468,共4页
Journal of Shandong Agricultural University：Natural Science Edition
关键词
光皮桦
种群优势度
增长动态
betula luminifera
advantrgeous degree
Logistic improved model
modified simples method.
