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时间:2020-06-06
《禁牧和适度放牧对典型草原蒙药材植物多样性的影响比较.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、第34卷第4期内蒙古农业大学学报Vo1.34No.42013年7月Ju1.2013JournalofInnerMongoliaAgricuhuralUniversity禁牧和适度放牧对典型草原蒙药材植物多样性的影响比较娜日苏,段淳清(内蒙古农业大学生态环境学院,nl~ti浩特010019)摘要:以植被样方调查方法,于内蒙古锡林郭勒典型草原进行了不同利用状况下植物种和蒙药材植物多样性比较研究.结果如下:在围封22a、围封10a和适度放牧条件下,蒙药材植物在物种组成中所占的比例分别是7.69%、21.95%、31.82%;相对重要
2、值和分别为1.1、7.35、18.9,说明在禁牧状态下,蒙药材植物种类减少,重要值和占该样地全部物种重要值的百分比降低,而且,禁牧时间越长,这个趋势越明显;适度放牧状态下,蒙药材植物种类增多,重要值和占该样地全部物种重要值的比例明显提高。不同利用状况下蒙药材植物3种指数表现各异:围封22a,丰富度、优势度和均匀度都降低:围封10a,丰富度增加,优势度和均匀度受到围封前的状况影响;适度放牧条件下,丰富度高,冷蒿等适牧植物优势度提高,从而均匀度降低。关键词:禁牧;适度放牧;典型草原;蒙药材;物种多样性中图分类号:$812.8文献标
3、识码:A文章编号:1009—3575(2013)04—0036—06COMPARlNGTHEEFFECTSOFGRAZING—PROHIBlTlONANDMODERATEGRAZINGONMONGOLIAMEDlCINALPLANTSDIVERSITYINTYPICALSTEPPENarisu,DUANChun—qing(CollegeofEcologyandEnvironmentalScience,InnerMongoliaAgriculturalUniversity,tluhhot010019,China)Abstract
4、:ThispaperstudiesandcomparesplantspeciesandMongolianmedicinalplantsdiversityunderdiferentutilizationcondi—tionsoftypicalsteppeinXilinguoleofInnerMongolia.Vegetationquadratsamplingtechniquewasusedfortheinvestigation.There—suitsshowedthatundervafingconditionsof22一year
5、exclosure,10一yearexclosureandmoderategrazing,theratiosofMongolianme—dicinalplantspecieswere7.69%.21.95%and31.82%respectivelyinproportiontOthetotalplantspecies:thesumoftherelativeimportancevalueswere1.1,7.35and18.9.Undergrazing—prohibitioncondition,thenumberofMongoli
6、anmedicinalplantspeciesdecreasedandtlleimpo~ancevalueaswellastheimportancevaluepercentageoftheentireplantspeciesinthequadratdecreased.Thelongergrazing—prohibitionperiodwas,themoreobvioustifstrendwas.Thesefiguresincreasedmarkedlyundermoderategrazingcon—dition.Thespec
7、iesrichness,dominanceandevennessindcxesforMongolianmedicinalplantsdisplayvariousbehaviorsunderdifferentutilizationconditions:theyweredecreasedafter22yearsofexclosure.Thespeciesrichnessincreasedunder10一yearexclosurccondi—tion.butothertwoindexeswereinfluencedbypre—exc
8、losureconditions.Undermoderatelygrazedcondition,bothbiologicalrichnessanddominanceofgrazing—suitableplantssuchasArtemisiafrigidawereimprov
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