Deng, Jufen

Huang, Bizhi

Huang, Meifen

Wu, Wenrong

Yuan, Fujin

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings 21st International Grassland Congress / 8th International Rangeland Congress Affect of Fencing on Community Structure and Species Diversity of Eragrostis nigra on Degraded Grassland in Karst Area Wenrong Wu Beef Cattle and Pasture Research Center of Yunnan Province, China Jufen Deng Pasture and Feed Station of Yunnan Province, China Bizhi Huang Beef Cattle and Pasture Research Center of Yunnan Province, China Fujin Yuan Beef Cattle and Pasture Research Center of Yunnan Province, China Meifen Huang Beef Cattle and Pasture Research Center of Yunnan Province, 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/21/4-2/16 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 ]624　 瞯 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅰ 　Grasslands/Rangelands Resources and Ecology ——— Indicators for Sustainable Use and Conservation of Grasslands/Rangelands ResourcesAffect of fencing on community structure and species diversity of Eragrostis nigra on degradedgrassland in Karst AreaWu Wen‐rong ,Deng Ju f en2 ,H uang Biz hi1倡 ,Y uan Fuj in1 ,H uang Mei f en11 Bee f cattle and pasture research center o f Y unnan p rov ince , K unming ,Yunnan 650212 P .R . o f China ;2 Pasture and FeedStation o f Y unnan Prov ince 650021 P .R . o f China , 倡 E‐mail :wuwenrongyn＠ 126 .comKey words : Eragrostis nigra , degraded pasture , fencing , community structure , species diversityIntroduction Backspiked lovegrass ( Eragrostis nigra ) played a very important role in grassland resources in Karst area .However , because of over grazing in the long past , it caused a serious degradation of grassland and heavy soil erosion , leadingto the continual expansion of bare land in the area . The trial , through three‐year observation , was aimed at effect of restorationof Eragrostis nigra vegetation on the degraded grassland by means of fencing so as to provide theoretical foundation andpractical measures for sustainable utilization of the grassland in karst area .Materials and method the trail was conducted at hill site in Qiubei county , Yunnan( East longitude １０３°５２′ , north latitude ２４°０４′ , elevation ２３００ meters , annual rainfall １１２０mm , annual temperatures １３ .４ ℃ ) w ith １hm２ fenced to compare with naturalgrazing without fencing . The vegetation of the trial land was dominated with Eragrostis nigra and Shiny cinqueflil ( Potentilaf ulgense ) and the total coverage of the community was about ６０％ ‐７０％ with sward height about １５cm in average . Thecoverage , density , height and biomass of the vegetation community were measured before the trial and the same items wererecorded in September each year during the trial phase .Results The results showed that :(１) Coverage of pasture was increased from ６０％ ( before fencing ) to １００％ after fencing . Thequantity characters and spatial characters of dominant species changed regularly , such as sward height was increasedsignificantly ,both blackspiked lovegrass and Shiny cinqueflil ( Potentila f ulgense ) wereincreased significantly and dominatedupper synusia gradually . The density of blackspiked lovegrass was decreased annually . ( ２ ) Comparing with control ,richnessindex of community and indexes of Margalef were increased significantly during three years by fencing . Indexes of Menhiniekwas increased significantly in the second and third years . Diversity indexes of Shannon‐Weaver was increased significantly in thesecond year ,but it was not significant in the third year . There was no significant difference on Pielou evenness index in therestoration processing of degraded pasture . ( ３ ) Clustering between community of different fencing phase , ５ communitiescluster ３ kinds , Ⅰ ( before fencing and without fencing ) , II ( second year and third year ) , III ( first year after fencing ) .( ４ )Second years and third year af ter fencing ,the total above‐ground biomass ,grass and forbs were increased significantly . Thelegume biomass after four months of fencing was higher than those of control , sixteen months and twenty‐eight months afterfencing . After twenty‐eight months of fencing , the total biomass of pastures increased ４ times ( comparing with control) ,andreached to ５ .８ t / hm２ （DM ) . There was also a obvious change in community of vegetation with ratio of grass and legumeincreased from ２１％ to ５５％ ,forbs decreased from ７６％ to ４３％ , and legume decreased from ６％ to １％ .Conclusions With fencing , the vegetation coverage in the trial grassland was greatly improved , which effectively controlled thesoil erosion . At the same time , after fencing , the sward height , output of the biomass and the productivity of the grassland allwere improved in large standard . The ratio of perennial grass in the vegetation was largely increased , while that of the fordsdecreased after fencing , which , in turn , significantly improved the quality of the grassland , maintaining the sustainableutilization of the grassland . Fencing treatment improved the species diversity in the community of the grassland , maintainingthe stability and capability to stressing of the community of the grassland . Therefore , on the degraded grassland dominatedwith Eragrostis nigra , fencing was an effective technical measure for restoration . In the actual practice , it was suggested thatdegraded grassland could be used again af ter third year of fencing . Rotational grazing with adequate grazing was recommended .ReferencesZhou Huakun , Zhou Li , Liu Wei . Affect of Fencing on Degraded and Undegraged Artemisia L . Sward . [ J] China Grassland２００３ ,(５) ,１５‐２２ .K .A . Wolkort ,J .C .Gorden . Eco‐system — the Science of Balance and Management [ M ] T ranslated by Ouyan Hua ,WangZhenquan . Science Press , Beijing , ２００２ ,４０‐４９ .

Affect of Fencing on Community Structure and Species Diversity of \u3cem\u3eEragrostis nigra\u3c/em\u3e on Degraded Grassland in Karst Area

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Affect of Fencing on Community Structure and Species Diversity of \u3cem\u3eEragrostis nigra\u3c/em\u3e on Degraded Grassland in Karst Area

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