1) capital tree
基调树种
1.
We had made tree census for twice to go to Chang Zhou city ,He Bei Provinee Whose soil is serious saline and alkaline The trees we had investigated amount tomore than 1300 trees They belong to 21 fanilies ,47 genuses ,we had analized the investigated conclusion So we had selected the capital trees and the vital trees in deiverse green surface according to the natural environment of the cit
分析调查结果,并据沧州市的自然概况,选择沧州市的基调树种和各类型绿地的骨干树种。
2) basic-tone tree species
[林]基调树种
4) standard tree species
基准树种
5) tree species structure adjustment
树种结构调整
1.
According to the forest resource status and structure characters in Fujian Province,the necessity of tree species structure adjustment and some problems of tree species structure adjustment should be considered were put forward,simultaneously,the direction and way of structure adjustment of some major tree species of Cunninghamia lanceolata,Pinus massoniana and broadleaved tree,etc.
根据福建省森林资源现状、结构特点提出关于树种结构调整必要性、树种结构调整必须考虑的几个问题 ,同时着重提出杉木、马尾松、阔叶树等几个主要树种的结构调整的方向、途径以及现有资源的合理利用等。
6) Tree species application and adjustment
树种应用调整
补充资料:Σ(基调)代数
Σ(基调)代数
∑(signature) algebra
乏(J一d lao)da一shu名(基调)代数(名(signature)aigebra)一种非齐性代数,由G.Birklloff等于1970年作为对齐性代数的推广而引进。在非齐性代数中,元素集被分成几个互不相交的子集。每个代数运算均以特定的子集为其定义域和值域。描述这种结构的语法称为基调。 基调和名代数令5={s、}i任川为一有限集,其中I是一个有限下标集,每个s:称为一个类子(可以看作乏代数中元素的类型)。O={oj}]任J}为另一有限集,J也是有限下标集,每个oj称为一个运算。一个k目运算q(k)0)可表为 Oj:5 IX、ZX…X乓~s走+1(1)其中、1,…,、、,sk千les。对偶艺=<5,0>称为一个基调。 给定基调乞。=
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