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应用生态学报 ›› 2011, Vol. 22 ›› Issue (10): 2574-2580.

• 研究论文 • 上一篇    下一篇

小陇山红桦次生林物种组成与立木的点格局分析

郭垚鑫1,康冰2,李刚2,王得祥3,杨改河1,3**,王大伟4   

  1. 1西北农林科技大学农学院,陕西杨凌 712100; 2西北农林科技大学生命学院, 陕西杨凌 712100;3西北农林科技大学林学院, 陕西杨凌 712100;4小陇山林业科学研究所, 甘肃天水 741020
  • 出版日期:2011-10-18 发布日期:2011-10-18

Species composition and point pattern analysis of standing trees in secondary Betula albo-sinensis forest in Xiaolongshan of west Qinling Mountains.

GUO Yao-xin1, KANG Bing2, LI Gang2, WANG De-xiang3, YANG Gai-he1,3, WANG Da-wei4   

  1. 1College of Agronomy, Northwest A & F University, Yangling 712100, Shaanxi, China; 2College of Life Science, Northwest A & F University, Yangling 712100, Shaanxi, China; 3College of Forestry, Northwest A & F University, Yangling 712100, Shaanxi, China; 4Xiaolongshan Research Institute of Forestry, Tianshui 741020, Gansu, China
  • Online:2011-10-18 Published:2011-10-18

摘要: 选择秦岭西段小陇山典型红桦次生林群落样地进行物种组成及种群径级结构研究,并运用单变量O-ring函数、双变量O-ring函数对各种群的空间分布格局及种间相关性进行多尺度分析.结果表明: 在红桦次生林群落样地中,红桦占据明显的优势地位;从径级结构看,红桦幼苗匮乏,天然更新不良,而巴山冷杉和山杨更新状态良好;红桦和旱柳主要表现为随机分布,巴山冷杉和山杨表现为小尺度聚集性分布格局;红桦与巴山冷杉和山杨在中尺度上呈正相关,而旱柳与红桦、巴山冷杉和山杨在小尺度上呈负相关,其余种间相关性不明显.目前小陇山红桦次生林群落种群的分布格局在小尺度上决定于种群的生物学特性,而在更大尺度上决定于环境异质性;未来一段时间内,先锋种群红桦将处于生长优势地位,但从长远看,仍需要人工辅助更新.

Abstract: An investigation was conducted on the species composition and population diameter-class structure of a typical secondary Betula albo-sinensis forest in Xiaolongshan of west Qinling Mountains, and the spatial distribution pattern and interspecific correlations of the main populations were analyzed at multiple scales by the O-ring functions of single variable and double variables. In the test forest, B. albo-sinensis was obviously dominant, but from the analysis of DBH class distribution, the B. albo-sinensis seedlings were short of, and the natural regeneration was very poor. On the contrary, the regeneration of Abies fargesii and Populus davidianas was fine. B. albo-sinensis and Salix matsudana had a random distribution at almost all scales, while A. fargesii and P. davidianas were significantly clumped at small scale. B. albo-sinensis had positive correlations with A. fargesii and P. davidianas at medium scale, whereas S. matsudana had negative correlations with B. albo-sinensis, A. fargesii, and P. davidianas at small scale. No significant correlations were observed between other species. The findings suggested that the spatial distribution patterns of the tree species depended on their biological characteristics at small scale, but on the environmental heterogeneity at larger scales. In a period of future time, B. albo-sinensis would still be dominant, but from a long-term view, it was necessary to take some artificial measures to improve the regeneration of B. albo-sinensis.