【摘要】 选取云南、四川省3个不同生境作为样地,研究紫茎泽兰入侵对不同生态系统土壤中碱解氮、速效磷、速效钾含量的影响。结果表明,紫茎泽兰入侵造成样地a土壤碱解氮、速效磷、速效钾含量分别显著下降33.9%、44.2%和32.2%;样地b仅土壤速效磷显著下降31.0%;样地c土壤各营养元素未见显著变化。在不同时间,样地a处理组各营养元素含量基本低于对照组,以2005年7月至10月的差异最显著。这说明紫茎泽兰入侵对土壤养分的影响因生境不同而异,且与紫茎泽兰的生长节律有关。更多还原

【Abstract】 Three sample plots of different habitat were selected in Yunnan and Sichuan to study effects of invasion of Eupatorium adenophorum on content of available nitrogen,available phosphorus and available potassium in soil.Results show that available nitrogen,available phosphorus and available potassium decreased by 33.9%,44.2%,and 32.2%,respectively,in Plot a; only available phosphorus did by 30.1% in Plot b;and no significant change was observed in Plot c.During the experiment,Plot a was found lower than the control in soil nutrient content,regardless of time period,and especially during the period from July to October of 2005,which suggests that the effect of the invasion of Eupatorium adenophorum varied from habitat to habitat,and was related to the growth rhythm of Eupatorium adenophorum.更多还原