Wei, Zhijun

Yan, Ruirui

Yang, Jing

Yang, Shangming

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings 21st International Grassland Congress / 8th International Rangeland Congress Study on Community β‐Diversities of Different Grazing Systems in a Desert Steppe Environment Zhijun Wei Inner Mongolia Agriculture University, China Ruirui Yan Inner Mongolia Agriculture University, China Jing Yang Inner Mongolia Agriculture University, China Shangming Yang Inner Mongolia Agriculture University, China 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/21/1-3/41 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 ]140　 瞯 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅰ 　Grasslands/Rangelands Resources and Ecology ——— Ecology of Grasslands/RangelandsStudy on community β‐diversities of different grazing systems in a desert steppe environmentWei Zhi j un , Y an Ruirui , Y ang Jing , Y ang ShangmingCollege o f Ecol . and Env . Sci . , Inner Mongolia A gric . Univ . , Hohhot , Inner Mongolia 010019 . P .R . .China ,E‐mail :nmndw z j＠ 163 .comKey words : desert steppe , continuous grazing , rotational grazing , β‐diversityIntroduction Plant community diversity is composed of community composition and dynamic diversification ( Xie Yingzhong ,１９９９) . For the relationships of prairie plant community diversity and grazing , there has been a substantial amount of researchconducted ( Grimes J P ,１９７３ ; Huston M . A ,１９７９ ) , but there are very few studies on the change process of grasslandcommunity plant diversity in different grazing systems . Knowledge about the changes of plant diversity of desert grasslandcommunities under different grazing systems can lay a foundation for further in‐depth study on eco‐functions of desert grasslandcommunity biodiversity .Materials and methods The study site was located in Stip a brev i f lora desert steppe in Sunit Right Banner of Inner Mongolian( ４２°１６′２６″N ,１１２°４７′１７″E) .Annual‐mean temperature is ６ .２ ℃ and average precipitation is ２０９ .１２ mm .Dominant vegetation isthe community of Stip a brev i f lore and Cleistogenes songorica and A llium poly rhiz um . The experimental treatments werecomposed of a continuous grazing plot of ３４０ hm２ , a rotational grazing plot of ３２０ hm２ divided into ８ smaller , equally sizedplots and a grazing exclusion plot of １hm２ , which has not been grazed since １９９９ . Stocking rate on grazing plots was １ .２５sheep/ hm２ . Plant community β‐diversity was measured . Statistical analysis software SAS８ .２ and EXCEL２００３ were used toanalyze data for this research .Results and discussion The index of community β‐diversity decreased with increasing quadrat size ( Figure １) . Three treatmentsdid not differ significantly with the same sample size on Desert Steppe ( p ＞ ０ .０５ ) . The highest index of β‐diversity was inrotational grazing treatment . This may be because there was certain leisure time in rotational grazing , so the plant grow thaccelerated and vegetation cover increased . This may have lead to a higher β‐diversity index in the rotational grazing plot . Theresults showed that community structure is relatively complex and stable on a certain extent in rotational grazing system .Figure 1 Community β‐diversity under di f f erent graz ing system .Conclusions Community β‐diversity index decreases with the increasing quadrat size . The highest index of β‐diversity wasobserved under a rotational grazing system .ReferencesXie Yingzhong ,(１９９９) . Introduction to plant ecology .[ M ] Yin Chuan : The Ningxia People摧s Publishing House ４６‐４８ .Grimes J P , (１９７３ ) .Control of specoes diversity in herbaceous vegetation .[ J] Env iron Manage １ :１５１‐１６７ .Huston M , ( １９７９) . A general hypothesis of species diversity . AmNat １３ :８１‐１０１ .>< 10 Q) "O □ RG ~CG □ CK C 8 >, 6 ..... en 4 ,._ Q) > 2 "O I 0 en. 1/64m' 1/32m' 1/16m' 1/Bm' 1/4m' 1/2m' 1m' 2m' 4m' Sm' 16m' Sample area(m 2) 

Study on Community β‐Diversities of Different Grazing Systems in a Desert Steppe Environment

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Study on Community β‐Diversities of Different Grazing Systems in a Desert Steppe Environment

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