节点文献
大型节水改造灌区植物种类多样性评价分析
Diversity assessment and analysis of vegetation species in a large-scale irrigation district under a water-saving project
【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。
【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.
【Key words】 Hetao irrigation district; water-saving project; index of vegetation diversity; grey incidence recognition;
- 【文献出处】 中国农业大学学报 ,Journal of China Agricultural University , 编辑部邮箱 ,2010年03期
- 【分类号】S184
- 【被引频次】6
- 【下载频次】191