The role of coffee agroforestry in the conservation of tree diversity and community composition of native forests in a Biosphere Reserve

2014 ◽  
Vol 189 ◽  
pp. 154-163 ◽  
Author(s):  
Vivian Valencia ◽  
Luis García-Barrios ◽  
Paige West ◽  
Eleanor J. Sterling ◽  
Shahid Naeem
2015 ◽  
Vol 08 (01) ◽  
pp. 1550011 ◽  
Author(s):  
Youhua Chen

A community composition island biogeography model was developed to explain and predict two community patterns (beta diversity and endemism) with the consideration of speciation, extinction and dispersal processes. Results showed that rate of speciation is positively and linearly associated with beta diversity and endemism, that is, increasing species rates typically could increase the percentage of both endemism and beta diversity. The influences of immigration and extinction rates on beta diversity and endemism are nonlinear, but with numerical simulation, I could observe that increasing extinction rates would lead to decreasing percentage of endemism and beta diversity. The role of immigration rate is very similar to that of speciation rate, having a positive relationship with beta diversity and endemism. Finally, I found that beta diversity is closely related to the percentage of endemism. The slope of this positive relationship is determined jointly by different combinations of speciation, extinction and immigration rates.


2018 ◽  
Vol 265 ◽  
pp. 461-469 ◽  
Author(s):  
Joannès Guillemot ◽  
Guerric le Maire ◽  
Manjunatha Munishamappa ◽  
Fabien Charbonnier ◽  
Philippe Vaast

2018 ◽  
Vol 10 (3) ◽  
pp. 945-953 ◽  
Author(s):  
Akash . ◽  
Navneet . ◽  
B.S. Bhandari

In present study, we present data on tree diversity, stand structures and community composition in six sites of tropical forest in Rajaji tiger reserve, Northern India. The enumeration of 72 plots results a total of 19,050 individuals, 47 species, 42 genera, 25 families in which Holoptelia integrifolea, Dalbergia sissoo, Shorea robusta, Cassia fistula and Trewia nudiflora were the species which showed higher importance value index (IVI) in the study area. The stand density of the six sites ranges from 149.99 - 397.91 hac-1 where as the total basal area of trees ranges from 3.612 - 46.813 m2/hac-1. The Shannon diversity index ranged from 1.35 to 2.51, Simpson index ranged from 0.097 - 0.446, Margalef index ranged 2.584 - 4.9, The Evenness index ranged from  0.551 - 0.852 in the study area. Further the studied area has showed ample evidences from indices in supporting the higher floristic diversity and stand structure after providing the present area as a status of tiger reserve.


2020 ◽  
Vol 11 ◽  
Author(s):  
Raeid M. M. Abed ◽  
Mary Shanti ◽  
Thirumahal Muthukrishnan ◽  
Zayana Al-Riyami ◽  
Bernhard Pracejus ◽  
...  

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