Volume 12, Issue 4 (1-2019)
مرتع 2019, 12(4): 452-463 |
Back to browse issues page
Download citation:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:
Kazemi M, Karimzadeh H, Tarkesh Esfahani M, Bashari H. Effects of thirty-three years exclusion on diversity, richness and evenness indices in semi Steppe rangelands of Semirom- Isfahan (Case study: Hanna area). مرتع 2019; 12 (4) :452-463
URL: http://rangelandsrm.ir/article-1-677-en.html
URL: http://rangelandsrm.ir/article-1-677-en.html
Abstract: (4381 Views)
Measuring species diversity is required in conservation, assessment and monitoring plans in rangeland ecosystems. This study aimed to evaluate the effects of long-term exclusion (thirty-three years) on plant diversity in Hanna area located in Semirom rangelands – Isfahan. Six transects with 100 m length were established in exclusion area and in adjacent properly grazed area. Plant cover, density, and richness of the species were recorded in 10 plots with 2 m2 size along each transect. Non-parametric diversity, richness and evenness indices, and parametric abundance distribution models were calculated for both areas using PASTsoftware. The T-test was used to compare diversity indices in the two sites. According to the results, although “properley grazed” site had higher diversity compared to the “not grazed” site, only Hill diversity indices varied significantly (p< 0.05) between these sites. Results indicated that richness indices varied significantly between the two sites (p< 0.05). Abundance distribution model showed that none of the parametric models (broken stick, lognormal, geometric series and log series) fitted to the diversity data in the “not grazed” site, indicating an unstable vegetation community. Broken stick and lognormal were best fitted parametric models among the species abundance models for the “properly grazed” site, indicating a stable vegetation community. Exploring diversity indices changes in the study area by Canonical Correspondence Analysis (CCA), indicated that the two sites were separated well in the ordination space and confirmed the obtained results from T-test. This study highlights the importance of proper grazing and grazing systems in semi- Steppe rangelands to maintain diversity indices in an appropriate level.
Keywords: Exclusion, Species diversity, Evenness, Richness, Abundance distribution model, Canonical correspondence analysis.
Type of Study: Research |
Subject:
Special
Received: 2019/01/18 | Accepted: 2019/01/18 | Published: 2019/01/18
Received: 2019/01/18 | Accepted: 2019/01/18 | Published: 2019/01/18
Send email to the article author
| Rights and permissions | |
 |
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. |
