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模糊超体积
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  fuzzy hypervolume
     Based on the theory of fuzzy hypervolume niche,8 species' niches of Chimonanthus praecox community in northwestern Hunan province are studied according to the basic data of the samplings.
     在模糊超体积生态位理论的基础上,根据样地调查所获得的基本数据,研究了湘西北蜡梅群落中8个物种的生态位.
短句来源
     Study and Application on the Theory of Fuzzy Hypervolume Niche
     模糊超体积生态位理论的探索与应用
短句来源
     Fuzzy hypervolume niche was proposed to overcome the limitation of Hutchinson's niche concept and the formulas to measure two important indexes—niche width and niche overlap which can be easily applied in practice.
     为克服Hutchinson的生态位定义的局限提出了模糊超体积生态位,以及度量生态位的两个重要指标——生态位宽度和生态位重叠,新公式便于应用。
短句来源
     Based on the theory of fuzzy hypervolume niche,the niches of 4 tree species in south subtropical zone are studied in order to find the rule of forest succession.
     在模糊超体积生态位理论的基础上,研究了南亚热带4个不同演替阶段树种苗木的生态位,探索森林群落演替的规律.
短句来源
     Based on fuzzy hypervolume niche,the relations of measurement between multi-and one-(dimensional) niche are studied and the formulas for making comparison with some other metric formulas are simplified.
     基于模糊超体积生态位,探索了多维生态位度量与一维生态位度量的联系,简化了模糊超体积生态位的度量公式,并与常用的生态位度量公式作了比较.
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  “模糊超体积”译为未确定词的双语例句
     The results indicate that multi-dimensional niche overlap is usually bigger than the product of separate niche overlaps if resource dimensions are independent and the formulas are close to Simpson Index and Schoener Formula respectively.
     结果表明:当物种利用的各个资源类型独立时,多维生态位重叠往往大于各维生态位重叠的乘积; 模糊超体积生态位的度量公式分别与Simpson指数和Schoener公式的形式相近;
短句来源
  相似匹配句对
     Study and Application on the Theory of Fuzzy Hypervolume Niche
     模糊超体积生态位理论的探索与应用
短句来源
     FUZZY RELATION OF CAUSE AND EFFECT
     模糊因果关系
短句来源
     The fuzzy analytic hierarchy process
     模糊层次分析法
短句来源
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  fuzzy hypervolume
A minimization of the fuzzy hypervolume makes no sense here.
      
For example, Gath-Geva's index that uses the value of fuzzy hypervolume as a measure is a good choice for compact clusters.
      
Optimalnumber of substructures in the data set can be estimated from the minimum of the fuzzy hypervolume and maximum of partition density.
      
Optimal number of substructures in the data set can be estimated from the minimum of the fuzzy hypervolume and maximum of partition density.
      
The cluster validity is proportional to the partition density and inversely proportionalto the fuzzy hypervolume.
      
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Concept of fuzzy hypervolume niche is put forward for overcoming the localizations of Hutchinson's niche,in which the boundary of niche is distinct.From the niche theory based on fuzzy sets,the formulas of niche width and niche overlap are obtained and applied to the temporal niche of Osmia exca-vata Alfken and O.jacoti Cockerell in apple orchards as an example.It is more feasible to accept the competition coefficient α=0.708 6 than α=0.935 0.

Hutchinson生态位的边界是清晰的.为克服这个局限,利用模糊数学发展了生态位理论,提出了模糊超体积生态位概念以及关于生态位宽度和生态位重叠的度量公式,并在苹果园中凹唇壁蜂和紫壁蜂的时间生态位研究中应用.种间竞争系数α=0.708 6,比已有研究文献中α=0.935 0更切实可行.表明作者的公式优于其他公式.

Based on fuzzy hypervolume niche,the relations of measurement between multi-and one-(dimensional) niche are studied and the formulas for making comparison with some other metric formulas are simplified.The results indicate that multi-dimensional niche overlap is usually bigger than the product of separate niche overlaps if resource dimensions are independent and the formulas are close to Simpson Index and Schoener Formula respectively.All these improve the application of the niche theory.

基于模糊超体积生态位,探索了多维生态位度量与一维生态位度量的联系,简化了模糊超体积生态位的度量公式,并与常用的生态位度量公式作了比较.结果表明:当物种利用的各个资源类型独立时,多维生态位重叠往往大于各维生态位重叠的乘积;模糊超体积生态位的度量公式分别与Simpson指数和Schoener公式的形式相近;有助于完善生态位理论的应用.

Based on the theory of fuzzy hypervolume niche,the niches of 4 tree species in south subtropical zone are studied in order to find the rule of forest succession.3-dimensional niche,which is formed by the ecological factors of pH value,nutrients and moisture,is measured by the net photosynthesis rate.The results indicate as following: niche width of these seedlings can be ordered as Pinus massoniana(0.405 6),Schima super ba(0.361 4),Castanopsis fissa(0.310 8) and Cryptocarya concinna(0.306 8),which corresponds...

Based on the theory of fuzzy hypervolume niche,the niches of 4 tree species in south subtropical zone are studied in order to find the rule of forest succession.3-dimensional niche,which is formed by the ecological factors of pH value,nutrients and moisture,is measured by the net photosynthesis rate.The results indicate as following: niche width of these seedlings can be ordered as Pinus massoniana(0.405 6),Schima super ba(0.361 4),Castanopsis fissa(0.310 8) and Cryptocarya concinna(0.306 8),which corresponds to the dominant(tree) species' order at different successional stages.Niche overlaps of these seedlings show the rather intense interspecific competition in the mass because of the minimum value 0.682 7.The competition coefficient in the interval [0.635 9,0.735 7] showes the tendency of the species avoiding competition which administers the species coexistence.The maximum difference of 0.126 2 and the minimum difference of 0.036 1 for niche overlap can be gained by using the principle of Cody & May and thus it is a good practice to avoid this principle.mathematical ecology;niche;fuzzy hypervolume;niche width;niche overlap;net photosynthesis rate;competition coefficient

模糊超体积生态位理论的基础上,研究了南亚热带4个不同演替阶段树种苗木的生态位,探索森林群落演替的规律.以所测定的净光合作用强度值为指标,度量包括pH值、矿物质营养浓度、土壤含水量三个生态因子的三维生态位.结果表明:生态位宽度的大小次序为马尾松(0.405 6),荷木(0.361 4),藜蒴(0.310 8)和黄果厚壳桂(0.306 8),正好对应演替不同阶段的优势种;生态位重叠最小值为0.682 7,表示总体上物种对资源的竞争较激烈;种间竞争系数介于0.635 9和0.735 7之间,表示物种间有回避竞争的趋势,这往往有助于物种共存;利用Cody和May的原则会带来生态位重叠的偏差最大为0.126 2,最小为0.036 1,因此应该避免使用Cody和May的原则.

 
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