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关帝山森林植被优势种群生态位

毛空1,张殷波1,张峰1,2**   

  1. 1山西大学黄土高原研究所, 太原 030006; 2山西大学生命科学学院, 太原 030006)
  • 出版日期:2013-11-10 发布日期:2013-11-10

Niche characteristics of dominant species in forest vegetation in Guandi Mountain, Shanxi of China.

MAO Kong1, ZHANG Yin-bo1, ZHANG Feng1,2**   

  1. (1Institute of Loess Plateau, Shanxi University, Taiyuan 030006, China; 2School of Life Science and Technology, Shanxi University, Taiyuan 030006, China)
  • Online:2013-11-10 Published:2013-11-10

摘要:

在野外调查的基础上,应用Shannon生态位宽度指数和Pianka生态位重叠指数,对关帝山庞泉沟国家级自然保护区森林植被中26个主要优势种(包括6种乔木、6种灌木和14种草本植物)的生态位特征进行定量分析。结果表明:(1)乔木层白桦具有最大的生态位宽度,灌木层土庄绣线菊生态位最宽,草本层披针叶苔草在所有26个优势种中生态位宽度最大,说明它具有较好的环境适应性,在竞争中占有优势地位;(2)物种生态位宽度与其在样方中的频数呈极显著正相关(P<0.01);(3)26个优势种的生态位普遍产生重叠,但重叠程度均较小,表明种间竞争并不激烈;(4)生态位重叠与生态位宽度之间的关系并不是绝对的正相关(P>0.05)。
 

关键词: 稳定碳同位素, 气候变化, 黑松, 树木年轮, 水分利用效率

Abstract: Based on the field survey, and by using Shannon index and Pianka index, a quantitative analysis was made on the niche characteristics of 26 dominant species, including 6 tree species, 6 shrub species, and 14 herb species, in the forest vegetation in Pangquangou National Nature Reserve in the middle of Lüliang Mountains, west of Shanxi. In the tree layer, Betula platyphylla had the widest niche breadth; in the shrub layer, the niche breadth of Spiraea pubescens was the widest. Among the 26 dominant species, Carex lanceolata in herb layer had the widest niche breadth, suggesting its strong adaptability to environment factors and the advantages in competition with the other species. There was a significant positive correlation between the species niche breadth and the species frequency (P<0.01). The niche overlapping among the 26 dominant species occurred generally, but the overlapping degree was lower, suggesting the less strong competition between species. The correlation between the niche overlapping and niche breadth was not positively significant (P>0.05).

Key words: Pinus thunbergii, tree ring, stable carbon isotope ratio, climate change., intrinsic water use efficiency