【摘要】 为研究节水改造工程对植被物种多样性产生的影响,采用样方调查法对典型节水改造区——河套灌区杨家河干渠衬砌与不衬砌渠道的周边植被状况进行分析。结果表明:1)未衬砌渠道和砌衬渠道的多样性指数分别为2.693和2.116,均匀度指数为0.613和0.529,未衬砌渠道均高于衬砌渠道;2)土壤水盐因子与植被多样性的灰色关联识别顺序为:2θ0~40 cm>4θ0~60 cm>pH0~20 cm>pH40~60 cm>pH20~40 cm>EC0~20 cm>EC20~40 cm>0θ~20 cm>EC40~60 cm,即土壤含水率是决定研究区植物多样性的重要因素;3)未衬砌渠道周边植被生长状况明显优于衬砌渠道。生长环境的改变会导致部分草本植物退化,而对乔木、灌木的生长影响不大。更多还原

【Abstract】 In order to investigate the impact on the vegetation diversity under a water-saving project,the plant quadrat method was used to analyze the surrounding vegetation of the non-lining channel and the lining channel at Yangjia River of Hetao irrigation district as a typical water-saving zone.The results showed that:1) the vegetation diversity and evenness index of the non-lining channel are greater than that of the lining channel,the differences are 0.577 and 0.084,respectively;2) the analytical results of relations in soil water-salt factors and vegetation diversity by grey incidence recognition are θ20～40 cm>θ40～60 cm>pH0～20 cm>pH40～60 cm>pH20～40 cm>EC0～20 cm>EC20～40 cm>θ0～20 cm>EC40～60 cm,which indicates that water content in soil play a major role for this sequence;3) the growth status of the non-lining channel is better than the lining channel obviously.In conclusion,the effect of environmental changes may make some herbaceous plants degrade,but it is weak for arbors and shrubs.更多还原