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Method for measuring species uniformity

A technology of uniformity and species, applied in the field of species diversity measurement, can solve problems such as not intuitive enough, loss of community structure information, and inability to obtain holistic conclusions, and achieve the effect of high measurement efficiency and high accuracy

Inactive Publication Date: 2019-06-07
INST OF FORESTRY CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The above formulas are not intuitive enough. In addition, in actual work, since natural plant communities often do not have clear boundaries and limitations of human and material resources, it is difficult to conduct a census of the entire community. Species evenness is estimated
The uniformity value under a single sampling area can neither represent the uniformity of the species abundance distribution of the entire community, but also loses other community structure information, so the uniformity measurement value cannot be objectively determined as a whole

Method used

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specific Embodiment approach

[0011] The method for measuring species uniformity of the present invention, its preferred embodiment is:

[0012] The relative frequency of plant number distribution of different populations in the community is obtained by the typical community survey method, the actual relative frequency distribution of different populations and the genetic absolute distance and standard deviation under the uniform distribution are calculated respectively, and then the genetic absolute distance d′ corrected by the standard deviation xy Calculate the heterogeneity of the distribution of the number of species in different populations, and then obtain the evenness SE of each species in the community:

[0013]

[0014] where x i is the relative frequency of species i in community X; y i is the relative frequency of species i in evenly distributed community Y; k is the number of species in community X; with SE∈(0,1], the larger the value of SE, the greater the uniformity; the smaller the ...

specific Embodiment

[0015] If the ratio of the number of plants of each species in a community is equal, it means that the community has an absolutely uniform distribution of species evenness, that is, the community has the largest species uniformity. In other words, species evenness can be quantified by the difference between the distribution of the abundance measure of each species in the community and the uniform distribution of the number or frequency of each species. Therefore, if the difference between the distribution of each species abundance measure value of a community and its uniform distribution is small, the species uniformity of the community is considered to be high; lower. genetic absolute distance (d xy ) can be used to compare the differences between two populations or communities, or to compare whether two survey plots come from the same population, and the specific calculation formula is

[0016]

[0017] where x i is the relative frequency of genetic type i in community...

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Abstract

The invention discloses a method for measuring species uniformity. The method includes the steps: by means of a typical community survey method, obtaining the relative frequency for distribution of different populations in a community, calculating the actual relative frequency distribution of different populations and the genetic absolute distance and standard deviation under the uniform distribution, and then calculating the non-uniformity of the distribution of the number of species in different populations according to the genetic absolute distance d'xy corrected by the standard deviation so as to obtain the uniformity of each species within the community: as shown in the description, and performing variation measurement by using a genetic distance formula; defining yi in the genetic distance formula as equal frequency of all species in the community, that is, even distribution of the species; introducing a standard deviation of the frequency distribution of the species within the community in the genetic distance formula; and measuring the species uniformity by using the above SE formula . The method for measuring species uniformity is high in measurement efficiency and accuracy.

Description

technical field [0001] The invention relates to a method for measuring species diversity, in particular to a method for measuring species uniformity. Background technique [0002] Species diversity is the embodiment of community structure type, organization level, development stage, stability degree and habitat difference. Species uniformity refers to the uniformity of the abundance distribution of different species in the biological community. It is a very important concept in the study of community diversity. It reflects the relationship between the number of each species and the number of all species in the community, and reflects the ratio of the number of plants of each species. of balance. Species evenness is often expressed by Pieou evenness index, Sheldon evenness index, Heip evenness index and Alatalo evenness index. The research on the uniformity index is mainly to discuss theoretically from the formula itself, and more is to directly select a certain formula for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G16B40/00
Inventor 惠刚盈张岗岗张弓乔胡艳波赵中华
Owner INST OF FORESTRY CHINESE ACAD OF FORESTRY
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