植物空间分布的多样性及其度量

分析了23个物种多样性指数公式的取值范围和值域变化,发现它们可以分为3种类型即递增型、递减型和不定型.确定分布区中心或分布式样的中心可用递增型物种多样性指数公式,如Simpson(2),Simpson(3)/Gini,Simpson(5)/PIE,Shannon.Weaver和McIntosh等,据其平均值即可确定分布区中心或分布式样中心.用综合参数d;和Shannon-Weaver指数及其等级多样性与均匀度指数研究了我国裸子植物分布.结果表明,中国裸子植物综合丰度基本上自云贵川西南三省向四周辐射状递减,多样性指数也是自西南或华南向其它地区递减;均匀度指数变化规律不明显,但总的是我国东半部较高,热带与温带性质的交汇过渡地带是云贵川三者.

The Diversity of Plant Distribution and Its Measurement

This paper analyses the range of the value and their change of the representative formulae of 23 species diversity index. It is found that they can be divided into 3 types i,e.Increasing, Decreasing and Indefinite one. The determining the centres of the area and distributional pattern offing the study of the plant distribution are the most important problem. Authors think the Increasing type of species diversity index such as Simpson (2), Simpson (3)/Gini, Simpson (5)/PIE, Shannon-Weaver and Mclntosh (See Table 1) that is just suited to the study of plant distribution; secondary, according to the principle of of the average value of the species diversity index, we can determine the centres of the area and distributional pattern of the plant. This paper studies the distribution of gymnosperms in China by used the Comprehensive parameter d;, Shannon-Weaver index and its hierarchical diversity index. The results show: l.The comprehensive richness degree of gymnosperms in China is basically decreasing from the southwestern region of China to the eastern, western, northern, northeastern and northwestern regions of China radially.2.The values of diversity index of gymnosperms in China is decreasing from the southestern or southern region of China to others.3.The change law of evenness index of gymnosperms in China isn't very behind, but the whole is higher in the eastern half region of China.4.The overlapping zones between the Tropic and Temperate elements of the gymnosperms in China is the southwestern regions of China i.e.Yunnan,Guizhou and Sichuan three provinces.