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核心期刊论文目录 |
高寒矮嵩草草甸群落植物多样性和初级生产力对模拟降水的响应 |
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出 版 社:西北植物学报23(10):1713-1718 |
发表时间:2003 |
台 站:
海北高寒草甸生态系统定位研究站
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作 者:王长庭 王启基 沈振西 景增春 王文颖 |
点 击 率:7191 |
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关 键 字:关键词:模拟降水;矮嵩草草甸;植物多样性;初级生产力 |
摘 要:摘 要:通过野外控制实验,研究了高寒矮嵩草草甸群落植物多样性、初级生产力对模拟降雨条件的响应.结果表明: 1 在植物生长期 6月 ,增加降雨20%、增加降雨40%,植物群落物种多样性指数 H 和均匀度指数 J 分别比对照提高了0.188和0.011、0.735和0.076,生长期 7月 增加降雨20%物种H和J提高了0.409和0.07; 2 禾草类:增加降雨20%处理的地上生物量与对照相比没有明显的显著性差异 P>0.05 ,增加降雨40%处理的地上生物量与对照相比差异显著 P<0.05 ,说明过多增加降雨会抑制禾草的生长发育.杂类草:减少降雨50%处理的地上生物量与对照相比差异显著 P<0.05 ,其地上生物量对减少降雨的反映比较敏感.莎草类:其地上生物量对增加和减少降雨都没有显著变化; 3 0~10cm和0~30cm土层地下生物量均在增加降雨20%时最高,地下生物量的总量也在增加降雨20%时最高; 4 矮嵩草草甸地下生物量与地上生物量、总生物量的比值接近于生长季末时最大,且在模拟增加降雨20%的水平时,7、8、9月份地下和地上生物量较其它处理组高. |
关 键 字(英文):Keywords:simulatedrainfall;alpineKobresiahumilismeadow;biodiversity;productivity |
摘 要(英文):Abstract:Fieldcontrolledexpermentwasusedtoexamineresponseofbiodiversityandproductivitytosim-ulatedrainfallchangesinanalpineKobresiahumilismeadow.Theresultsindicatedthat1 Thediversityin-dex H andevennessindex J ofplantcommunityincreasedby0.188and0.011、0.735and0.076respec-tivelyoverthecontrolplotinthe20%and40%rainfallsupplyincreasedplotsinthegrowingseasonofplants June ,Thediversityindex H andevennessindex J ofplantcommunityincreasedby0.409and0.07overthecontrolplotinthe20%rainfallsupplyincreasedplotinthegrowingseasonofplants July .2 Grasses:Thereisnosignificantlydifferent P>0.05 between20%rainfallsupplyincreasedplotsandcontrolplotofbelow-groundbiomasses,significantlydifferent P<0.05 between20%rainfallsupplyin-creasedplotsandcontrolplotofabove-groundbiomasses,fromthiswecansaythatexcessiveprecipitationwouldrestraingrowthofgrasses.Forbs:50%rainfallsupplydecreasedplotsandcontrolplotsofabove-groundbiomassesshowsignificantlydifferent P<0.05 ,responseofabove-biomassestorainfallsupplydecreasedissensitive.Sedges:nosignificantlydifferentofSedgesbiomasstorainfallsupplyincreasedorde-creased.3 Thebelow-groundbiomassof0~10cm、0~30cmsoillayerandtotalbiomasswerehigherat20%simulatedrainfallsupplyincreased.Theproportionofbelow-groundbiomassandabove-groundbiomasswashighertheendinggrowingseasonaswellastotalbiomass,below-groundbiomassandabove-groundbiomasswerehigherthanothertreatmentplotsat20%simulatedrainfallsupplyinJuly、August、September. |
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