The diversity index showed that neca > pca > cka , and so did the evenness index . the dominant concentration index showed that cka > pca > neck . so the stability of the arthropod community in neca is best and that in cka is worst in the three areas
12.
Biodiversity indices are much influenced by the types of the vegetation in jinfo mt . the species richness index , diversity index and evenness index of the plots in karst area raised when the plots were jamming early and slightly ; species richness index and diversity index of the plots in nonkarst area raised when the plots were jamming early and slightly , but evenness index fell . the diversity index and species richness index of original vegetation in karst area are lower than in nonkarst area
13.
Diversity index on different terrain varied between 0 . 28 to 1 . 75 , the terrain followed the sequence of level land - plain > sloping land - medium - gradient mountain > sloping land - medium - gradient hill > level land - valley floor > sloping land - medium - gradient escarpment zone > level land - depression > steep land - high - gradient mountain ; the evenness index on different terrain varied between
14.
By using of the richness , diversity and evenness indices , combined with twinspan , dca , dcca , multi - factors regression , correlation analysis techniques and so on , species diversity and diversification mechanism were studied . the communities were classified into eight types by twinspan . the first axis of dca indicated basically the diversification of soil water , while the second axis indicated basically the disturbance degree by people . the correlations between n , organic matter , elevation and the first axis are negative association , and the others are positive
15.
H " was calculated using the shannon - wiener formula : h " = ? pi ? pi e was calculated using the pielou ' s evenness index e : e = h ' hmax = h ' ? s the results showed that diversity index on different parent materials varied between 0 . 49 to 1 . 02 , the different parent materials followed the sequence of igneous rock > sedimentary rock > metamorphic rock > unconsolidated material ; the evenness index on different parent materials varied between 0 . 27 to 0 . 64 , the parent materials followed the sequence of igneous rock > sedimentary rock > metamorphic rock > unconsolidated material
16.
Based on plant communities and plots investigation in jinfo mt . and experimental site in guilin , the author calculated the indices of every plot with its species richness index , simpson index , shannon - wiener index , pielou evenness index and alatalo evenness index . the author analyzed the character and variation of the biodiversity in different area and different layers about the plots in jinfo mt
17.
The density with the biodiversity increasing shows " m " model . ( 3 ) the correlation analysis shows : elevation , slope , development stage and biomass are main factors which affect the biodiversity pattern in the research region . the biodiversity of the quercus aliena var . acutesrata community shows the patterns with the elevation and slope affecting : on sunny slope , the species diversity increases with the elevation increasing below the attitude of 1640m and its climax is at this attitude ( the diversity index h = 1 . 68 ) , upward this point , the diversity index descends slowly . the evenness shows ascend trend with the elevation upward , its climax point at 1800m ( the evenness index jsw = 0 . 78 ) , then descending after this point
18.
We use the landscape acreage index , landscape fragmentation index , landscape apartness index , landscape diversity index , landscape dominance index , landscape evenness index and landscape shape index , to analyze the characteristics of the changes of landscape based on the landscape structure in 1996 and 2004
19.
The results showed that , in the course of wasteland restoration , the cultivated vegetation grew well ; the plant species was increased from 13 to 60 , and the richness index , evenness index and diversity index of species was increased significantly ; the proportion of annual and biennial herbage in vegetation composition was decreased from 61 . 5 % to 35 % , and the vegetation coverage was increased from 18 % to 80 %
20.
These diversity indexes indicate a trend - the more abundant and even the components and more complicated the habitats of the community , the higher value of these diversity indexes whether margalef species richness index ( d _ ( ma ) ) , shannon - wiener index ( h " ) , or pielou evenness index ( jsw ) were used to analyze the biodiversity of terrestrial mollusca . the change of shannon - wiener ( h " ) is accordant with species and margalef species richness index ( d _ ( ma ) )
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