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江苏龙池山自然保护区红楠(Machilus thunbergii)生存群落结构及其环境解释

张志敏1,2,杨国栋1,2,谢梦梦1,2,钟育谦3,翟飞飞3,王贤荣1,2,伊贤贵1,2*   

  1. (1南京林业大学南方现代林业协同创新中心,南京210037;2南京林业大学生物与环境学院,南京210037;3江苏省野生动植物保护站,南京210036)
  • 出版日期:2019-06-10 发布日期:2019-06-10

Community structure and environmental interpretation of Machilus thunbergii in Mountain Longchi, Jiangsu Province.

ZHANG Zhi-min1,2, YANG Guo-dong1,2, XIE Meng-meng1,2, ZHONG Yu-qian1,2, ZHAI Fei-fei3, WANG Xian-rong1,2, YI Xian-gui1,2*   

  1. (1Co-Innovation Center for the Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China; 2College of Biological Environment, Nanjing Forestry University, Nanjing 210037, China; 3Jiangsu Wildlife Conservation Station, Nanjing 210036, China).
  • Online:2019-06-10 Published:2019-06-10

摘要: 为了解释环境因子对红楠生存群落的影响,根据64个样方数据,选用多元回归树(MRT)和典范对应分析(CCA)方法,对江苏龙池山自然保护区内红楠生存群落进行分类、排序以及物种多样性垂直分布格局研究。结果表明:(1)群落物种有72科129属153种,生存群落属中亚热带常绿阔叶林,红楠是重要优势种;乔木层占绝对优势,红楠幼苗生长处于劣势地位;(2)MRT将该地区群落划分为4个群丛:Ⅰ)麻栎+化香树-冬青+油茶-沿阶草+淡竹叶群丛,Ⅱ)红楠+蓝果树-山鸡椒+格药柃-金星蕨+淡竹叶群丛,Ⅲ)青冈+栓皮栎-窄基红褐柃+木莓-金星蕨+狗脊群丛,Ⅳ)米槠+檫木-光亮山矾+马银花-紫金牛+沿阶草群丛,分类结果在空间上反映了龙池山红楠生存群落演替变化趋势;(3)CCA排序结果验证了MRT的分类结果,并显示海拔和土壤含水量是影响龙池山自然保护区红楠生存群落分布与扩张的重要影响因子;(4)红楠生存群落物种多样性随海拔的升高呈现上升再下降的单峰格局,在海拔150 m达到最大值。

关键词: UV-B增强, 硅肥, 水稻, CH4排放, 水稻土

Abstract: To understand the effects of environmental factors on Machilus thunbergii community in Mountain Longchi Nature Reserve, the classification, ordination and vertical distribution pattern of species diversity in this community were investigated using the Multiple Regression Tree (MRT) and the Canonical Correspondence Analysis (CCA) method, with data from 64 plots. The results showed that: (1) The Mountain Longchi Nature Reserve consisted of 153 species, 129 genera and 72 families, which belonged to midtropical evergreen broad-leaved forest, with M. thunbergii being the predominant species. The arbor layer had an absolute advantage, and the seedlings of M. thunbergii were in a disadvantaged status. (2) According to MRT results, the community could be divided into four groups: Ⅰ. Quercus acutissima+Platycarya strobilacea-Ilex chinensis+Camellia oleifera-Ophiopogon bodinieri+Lophatherum gracile, Ⅱ.Machilus thunbergii+Nyssa sinensis-Litsea cubeba+Eurya muricata-Parathelypteris glanduligera+Lophatherum gracile, Ⅲ. Cyclobalanopsis glauca+Quercus variabilis-Eurya rubiginosa+Rubus swinhoei-Parathelypteris glanduligera+Woodwardia japonica, Ⅳ. Castanopsis carlesii+Sassafras tzumu-Symplocos lucida+Rhododendron ovatum-Ardisia japonica+Ophiopogon bodinieri. The classification results reflected the trend of succession of M. thunbergii community. (3) The CCA results verified the classification results of MRT, and showed that elevation and soil moisture content were the important factors affecting the distribution and development of the M. thunbergiicommunity. (4) The species diversity of M. thunbergii community showed a unimodal distribution pattern with elevation, with a maximum value at 150 m.

Key words: elevated UV-B radiation, silicon fertilizer, rice, methane emission, paddy soil.