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                      |  SCI论文目录 |  
                    
                     
                      |  封育措施对退化与未退化矮嵩草草甸的影响 |   
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                      | 出 版 社:中国草地25(5):15-22 |   
                      | 发表时间:2003 |   
                      | 台  站:
                        海北高寒草甸生态系统定位研究站 |   
                      | 作  者:周华坤 周立 刘伟 王启基 赵伟 周彦艳 |   
                      | 点 击 率:5969 |   
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                      | 关 键 字:关键词:封育;退化矮嵩草草甸;未退化矮嵩草草甸;影响 |   
                      | 摘  要:摘要:连续5年的封育处理对退化与未退化矮嵩草草甸产生了影响。研究表明,除了退化矮嵩草草甸内的均匀度指数下降不显著外,封育使两种矮嵩草草甸样地内的丰富度指数、多样性指数和均匀度指数下降都达显著水平。两种矮嵩草草甸的上下层高度均增加,其中未退化矮嵩草草甸增加显著,退化矮嵩草草甸增加不显著。两种矮嵩草草甸的枯草盖度增加显著,绿草盖度减少显著,各种群特征发生了有规律的消长。未退化矮嵩草草甸的莎草和杂类草地上生物量减少显著,枯草生物量增加显著,禾草和优良牧草的生物量以及总地上生物量增加不显著,优良牧草比例由0.57下降为0.48。退化矮嵩草草甸在封育条件下,枯草、禾草生物量增加显著,莎草、优良牧草的生物量及总生物量增加不显著,优良牧草比例则由0.29上升为0.48,达到显著水平。未退化矮嵩草草甸的草地质量指数明显下降,退化矮嵩草草甸的草地质量指数则明显上升。 |   
                      | 关 键 字(英文):Keywords:Fencing;DegradedKobresiahumilismeadow;Non_degradedKobresiahumilismeadow;Influence |   
                      | 摘  要(英文):Abstract:5_yeartreatmentoffencinggreatlyinfluenceddegradedandnon_degradedKobresiahumilismeadows.Fencingmaderichnessindex,speciesdiversityindexesandevennessindexesdecreasedsignificantlyontwoplotsexceptevennessindexofdegradedKobresiahumilismeadow.Theheightsofplantcommunityoftoplayerandbottomlay rwereincreased,especiallythatonnon_degradedKobresiahumilismeadow.Thecover geoflitterwasincreasedsignificantlywhilethatofliveshootswasdecreasedsignifi antlyontwoplotsunderthefencingtreatment.Thecharacteristicsofplantpopulationwereinfluencedbyfencing.Onthenon_degradedmeadow,theabove_groundbiomassesofsedgesandforbsweredecreasedsignificantly,thelitterbiomasswasincreasedsignifi cantly,thebiomassesofgrassandpalatableherbageswerenotincreasedsignificantlyaswellasthetotalabove_groundbiomass.Onthedegradedmeadow,thebiomassesoflitterandgrasswereincreasedsignificantly,thebiomassesofsedgesandpalatableherbageswerenotincreasedsignificantlyaswellasthetotalabove_groundbiomass.Influencedbyfencingdisturbance,theproportionofpalatableherbagesonnon_degradedmeadowwasdecreasedfrom0.57to0.48whilethatondegradedmeadowwasincreasedsignificantlyfrom0.29to0.48.Theindexofqualityofnon_degradedKobresiahumilismeadowwasdecreasedsignificantlywhilethatofdegradedKobresiahumilismeadowwasincreasedsignificantly. |   
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