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安徽万佛山不同生境下银缕梅的种内与种间竞争强度

张光富1*,姚锐1,蒋悦茜2,陈福程2,张文燕2
  

  1. 1 南京师范大学生命科学学院, 江苏省生物多样性与生物技术重点实验室, 南京 210023; 2 南京师范大学中北学院, 南京 210023)
  • 出版日期:2016-07-10 发布日期:2016-07-10

Intraspecific and interspecific competition intensity of Parrotia subaequalis in different habi-tats from Wanfoshan Nature Reserve, Anhui Province.

ZHANG Guang-fu1*, YAO Rui1, JIANG Yue-qian2, CHEN Fu-cheng2, ZHANG Wen-yan2#br#   

  1. (1 College of Life Sciences, Nanjing Normal University, Jiangsu Key Laboratory of Biodiversity and Biotechnology, Nanjing 210023, China; 2 Zhongbei College, Nanjing Normal University, Nanjing 210023, China).
  • Online:2016-07-10 Published:2016-07-10

摘要: 利用Hegyi单木竞争指数模型,对安徽万佛山自然保护区不同生境下珍稀濒危植物银缕梅(Parrotia subaequalis)种群的种内、种间竞争强度进行定量分析,并讨论了森林群落中同一树种不同生境条件下的竞争强度。结果表明:银缕梅竞争压力主要来自种间,竞争强度为240.6,占总竞争强度69.3%;对象木银缕梅的种内、种间竞争强度依次为银缕梅>紫弹朴(Celtis biondii)>青冈(Cyclobalanopsis glauca)>黄连木(Pistacia chinensis)>朴树(Cel-tis sinensis)>枫香(Liquidambar formosana)>薄叶润楠(Machilus leptophylla);不同生境下银缕梅的数量以及种内、种间竞争强度不同,在山坡生境下银缕梅数量较多(178株),而沟谷生境下较少(仅65株);且前者的种内、种间竞争强度均大于后者。在两种生境下均是小径级(4.0 cm≤DBH<8.0 cm)银缕梅的种内、种间竞争强度最大;该区对象木银缕梅的竞争强度与其胸径大小近似服从幂函数关系(CI=ADB);随着银缕梅胸径的增大,所受到的竞争压力逐渐减小,当银缕梅胸径小于16 cm时,对象木受到的竞争强度较大。此外,森林群落中同一树种因生境不同其竞争强度存在差异。

关键词: 小麦, 15N标记, 种植密度, 氮肥水平, 硝态氮

Abstract: The intraspecific and interspecific competition intensities of rare and endangered tree Parrotia subaequalis in Wanfoshan Nature Reserve, Anhui Province, were quantitatively analyzed with Hegyi singletree competition index model. Meanwhile, for the same tree species from a certain forest community, its competition intensity in two different habitats (hillside and valley) was also discussed. The results showed that the main competitive intensity of the P. subaequalis population came from interspecific competition, and the value was 240.6, which accounted for 69.3% of the total. The competition intensity of intraspecific and interspecific competition with P. subaequalis followed the order of P. subaequalis> Celtis biondii> Cyclobalanopsis glauca> Pistacia chinensis> Celtis sinensis> Liquidambar formosana> Machilus leptophylla. Notably, individual number of P. subaequalis and intensity of intraspecific and interspecific competition were different between the two habitats. The number of trees of P. subaequalis in hillside (178) was more than that in valley (only 65); both intraspecific and interspecific competition intensity in hillside was stronger than in valley. The competition intensity of this species in the small size class (4.0 cm≤DBH<8.0 cm) was the strongest both in hillside and in valley. There was a significant negative correlation between the whole forest competition intensity and the DBH of objective trees (CI=ADB). The competition intensity of P. subaequalis declined with increasing DBH, and the stress was more intense for trees with DBH less than 16 cm. In addition, it is suggested that the competition intensity in different habitats may be probably different for a certain tree species in forest communities.

Key words: plant density, winter wheat, 15N labeled, nitrogen level, nitrate nitrogen content.