摘要
应用Shannon生态位宽度指数和Pianka重叠指数,结合DCA二维排序,对山西万家寨引黄工程北干线沿线植被优势种群的生态位进行了研究。结果表明:DCA排序图较好地反映了优势种群对水分的利用条件从中生过渡到旱生;狗尾草和猪毛菜的生态位宽度最大,说明它们对旱生和干扰严重的环境适应能力较强,而无芒雀麦的生态位宽度最小,表明它对干扰严重的生境适应性较差,可见Shannon生态位宽度指数较好地反映了植被在自然恢复群落上的分布特性;33个优势种群的生态位宽度指数与其频数呈现了极显著的正相关性(r=0.995,P<0.01),说明物种分布频数越大,Shannon生态位宽度指数就越高;无翅猪毛菜与沙蓬之间的Pianka重叠指数最大,且生态位宽度相近,这是由于它们对资源环境的利用比较相似,百里香与狗尾草、箭叶旋花的重叠值较低,这是由于它们的生态学差异性较大。
By using Shannon index and Pianka overlap index, and in combining with Detrended Corresponding Analysis＇（DCA） , this paper studied the niche breadth and overlap of the domi- nant species along the North Trunk of Wanjiazhai Yellow River Diversion Project （YRDP） in Shanxi of China. The results indicated that two-dimensional DCA ordination diagram could better reflect the water use condition of the dominant species under a transition from mesophytes to xero- phytes. As compared with other species, Setaria viridis and Salsola collina had a larger niche breadth, showing their stronger adaptability to xeric and heavy disturbance environments, while Bromus inermis had a smaller niche breadth, indicating its poor adaptability to severe disturbance habitat. Therefore, Shannon index could better reflect the distribution characteristics of plants in natural recovery community. The niche breadth index of 33 dominant populations had a signifi- cant positive correlation with the frequency of these populations （r=O. 995, P〈0.01 ） , sugges- ting that the greater the species frequency, the higher the Shannon index. The Pianka＇ s overlap index between S. komarovii and Agriophyllum squarrosum was the largest, with a similar niche breadth due to the resembled pattern of using environmental resources. However, the Pianka＇ s overlap index among Thymus mongolicus, S. viridis, and Convolvulus arbensis was lower because the ecological characteristics of these species were obviously different.
出处
《生态学杂志》
CAS
CSCD
北大核心
2013年第9期2263-2267,共5页
Chinese Journal of Ecology
基金
山西省自然科学基金项目(2013011037-1)
山西省回国留学人员科研项目(20100012)
科技部科技基础性工作专项(2011FY110300)资助
