Amiri, Fazel

Arzani, Hossein

Farahpour, M.

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings 21st International Grassland Congress / 8th International Rangeland Congress The Effects of Range Enclosure on Vegetation Composition and Density in Upland Grasslands of Iran Fazel Amiri Islamic Azad University, Iran Hossein Arzani University of Tehran, Iran M. Farahpour Range and Forest Institute, Iran Follow this and additional works at: https://uknowledge.uky.edu/igc  Part of the Plant Sciences Commons, and the Soil Science Commons This document is available at https://uknowledge.uky.edu/igc/21/6-2/4 The 21st International Grassland Congress / 8th International Rangeland Congress took place in Hohhot, China from June 29 through July 5, 2008. Proceedings edited by Organizing Committee of 2008 IGC/IRC Conference Published by Guangdong People's Publishing House This Event is brought to you for free and open access by the Plant and Soil Sciences at UKnowledge. It has been accepted for inclusion in International Grassland Congress Proceedings by an authorized administrator of UKnowledge. For more information, please contact UKnowledge@lsv.uky.edu. 瞯 ]776　 瞯 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅰ 　Grasslands/Rangelands Resources and Ecology ——— Reclamation of Grasslands/RangelandsThe effects of range enclosure on vegetation composition and density in upland grasslands of IranF . Amiri ,1 H . A rz ani 2 and M . Farahpour 31 Faculty Member o f Islamic A z ad University Busheher Branch . I ran . E‐mail : f amiri＠ na .iut .ac .ir , 2 Pro f . , o f RangeScience , Department o f Rangeland Sciences , Tehran University , 3 A ssist . , o f Range Science , Institute o f Range andForest , Tehran , I ran .Introduction Livestock and plants are in a constant interaction at range ecosystems . Overgrazing pressure due to the incrementof human population cause a significant reduction in plant grow th vigor , reproduction ability and poor establishment of valuableplants which lead to plant composition change and lower density of class I category range plants ( Brand and Goetz , １９８６ , andWarren et al . １９８６) .Materials and methods The experiment was conduced in Hanna rangeland in Isfahan province , central par of Iran . The non‐grazed range site was closed to grazing for ２５ years . The data collection was carried out for two years (２００４ and ２００５) in theclosed and opened range sites . Plant density , vegetation cover , floristic list of plant composition of class I ( palatable plant) , II( moderate palatable) and III ( non palatable) plants were colleted in two dominant vegetation types both in grazed and non‐grazed sites by proper number of quadrates (Wayne and Stubbendieck , １９８６) .Results and discussions There was a significant difference between the class I plant density in grazed and non‐grazed range sites( Table １) . Enclosure of range land enhanced the population and density of class I range plants which was due to providing abetter opportunity for reproduction and establishment of those species in non‐grazed range sites . In grazed areas the class IIrange plant had a better opportunity because of grazing pressure to develop and increase their population . In a similarexperiment by Warren et al ( １９８６ ) in range sites grazed by cattle , １３ important range species decreased in density after fiveyears .Table1 Vegetation Cover Rate in Non‐grazed and Grazed A reas .Palatability Class Vegetation Cover in Non‐grazed ( ％ ) Vegetation Cover in Grazed ( ％ ) T‐ valueI ５６ 妹.９ ２１ 2.２倡倡 ２５  .２１II １２ 耨１０ +.８NS ５ �.７６III ３ �.４ ２０ 2.６倡倡 ４２ ,.１倡倡 Significant difference ( p ＜ ０ .０１) 　 　 NS ＝ no significant difference ( p ＜ ０ .０１)The result in Table ２ showed that the enclosure was significant enhanced the total biomass cover . The percent of vegetationcover of class I in grazed treatment compared to class III was significantly reduced which could be explained by heavy grazing ,soil humus destruction due to water erosion , livestock trampling and lock of seed resources for natural re‐vegetation . Passeraand Boresta ( １９９６ ) in their experiment conducted in Argentina concluded that the reproduction of palatable perennial grassplants in plots closed to grazing was much faster them these grazed .Table 2 A nalysis o f v ariance f or Vegetation Cover Rate in on‐grazed and G razed A reas .Palatability Class df SS MS FVegetation Cover １ ]６９０３ 妹.１ ６９０３  .１ ７８ �.１８倡倡Error between samples ７０ t６１８０ 妹.８ ８８ 邋.３ ‐Sum ７１ t１３０８３ 谮.９ ‐ ‐倡倡 Significant difference ( p ＜ ０ .０１)The results of the present experiment support the positive effect of range site exclusion on vegetation development in semi‐aridrangelands of Iran .

The Effects of Range Enclosure on Vegetation Composition and Density in Upland Grasslands of Iran

https://uknowledge.uky.edu/cgi/viewcontent.cgi?article=2954&amp;context=igc

The Effects of Range Enclosure on Vegetation Composition and Density in Upland Grasslands of Iran

Abstract

Similar works

Full text

Available Versions

University of Kentucky