植物生态学报 ›› 2014, Vol. 38 ›› Issue (7): 655-664.DOI: 10.3724/SP.J.1258.2014.00061

• 研究论文 •    下一篇

浙江天童木本植物Corner法则的检验: 个体密度的影响

章建红1, 史青茹2,3, 许洺山2,3, 赵延涛2,3, 仲强2,3, 张富杰4, 阎恩荣2,3,*()   

  1. 1浙江省宁波市农业科学研究院, 浙江宁波 315040
    2华东师范大学环境科学系, 上海 200241
    3浙江天童森林生态系统国家野外科学观测研究站, 浙江宁波 315114
    4宁波市鄞州区林业技术管理服务站, 浙江宁波 315100
  • 收稿日期:2014-01-15 接受日期:2014-05-09 出版日期:2014-01-15 发布日期:2014-07-10
  • 通讯作者: 阎恩荣
  • 作者简介:* E-mail: eryan@des.ecnu.edu.cn
  • 基金资助:
    国家自然科学基金(31270475);国家自然科学基金(31070383);宁波市重大科技攻关项目(2012C1-0027)

Testing of Corner’s rules across woody plants in Tiantong region, Zhejiang Province: effects of individual density

ZHANG Jian-Hong1, SHI Qing-Ru2,3, XU Ming-Shan2,3, ZHAO Yan-Tao2,3, ZHONG Qiang2,3, ZHANG Fu-Jie4, YAN En-Rong2,3,*()   

  1. 1Ningbo Academy of Agricultural Science, Ningbo, Zhejiang 315040, China
    2Department of Environment Science, East China Normal University, Shanghai 200241, China
    3Tiantong National Forest Ecosystem Observation and Research Station, Ningbo, Zhejiang 315114, China
    4Forestry Technical Management Service Station, Yinzhou District, Ningbo, Zhejiang 315100, China
  • Received:2014-01-15 Accepted:2014-05-09 Online:2014-01-15 Published:2014-07-10
  • Contact: YAN En-Rong

摘要:

Corner法则反映了植物枝叶大小和数量配置的构型策略, 但是, 对于个体密度如何影响枝叶关系的理解仍不够深入。该研究选择浙江天童的25个植物群落, 通过比较枝大小(横截面积)-叶大小(总叶面积)关系和枝大小(横截面积)-枝数量(分梢密度)关系, 分析个体竞争对植物Corner法则的影响。结果显示: 1)在不同密度区间, 枝横截面积和总叶面积均显著异速正相关。2)个体水平上, 枝大小-叶大小回归方程的截距在低密度区间显著小于高密度区间, 表明在枝大小一定的条件下, 高密度群落的植物当年生枝条会支撑更大的总叶面积; 而物种水平上, 枝大小-叶大小回归方程的截距在不同密度区间没有显著性差异。3)枝横截面积与分梢密度显著负相关, 且各密度区间也存在显著小于-1的共斜率。4)个体水平和物种水平的分析结果都显示, 枝横截面积与分梢密度回归方程的截距在不同密度区间无显著差异, 表明高密度植物并没有比低密度植物在单位大小枝条上配置更多的分枝。总之, 植物枝大小-叶大小关系和枝大小-枝数量关系各自在不同的密度区间具有共同的变化斜率, 反映了天童地区植物Corner法则不随个体密度变化而改变。但是, 枝叶关系回归方程截距的改变表明, 个体竞争的加大会使得植物在枝叶大小的配置策略上进行调整, 从而可能通过生态位分化促进物种共存。

关键词: 异速生长, 群落密度, Corner法则, 个体竞争, 枝叶关系

Abstract:

Aims Corner’s rules reflect the architectural strategies of plants with respect to deployment of twig size and leaf size, as well as of the number of twigs and leaves. The objective of this study was to examine how Corner’s rules would vary among plants with different individual densities.
Methods The study site is located in the Tiantong National Forest Park (29.87° N, 121.65° E), Zhejiang Province. We measured twig cross-sectional area (twig size), total leaf area (leaf size per twig), and the number of twigs at a given twig size (branching intensity) in woody plants across 25 plots differing in stem density to examine the effects of individual competition on Corner’s rules. The standardized major axis (SMA) analysis was conducted to determine the quantitative relationships of twig size with leaf size and branching intensity.
Important findings Significant, positive allometric relationships between cross-sectional area and total leaf area were found in individual plants across all communities. There was no significant difference among communities of different density intervals in the slope of the linear regression between cross-sectional area and total leaf area of individual plants, and the common slope of the regressions was significantly greater than 1 (p < 0.001). The intercept was significantly greater for plants in communities with higher density than in those with lower density (p < 0.001), indicating that plants in a high density community support greater total leaf area than in a low density community for a given twig size. In contrast, a significant, negative allometric scaling relationship was found between branching intensity and cross-sectional area in individual plants across different communities. Also, no significant difference was found among plants in communities of different density intervals in the slope of the regression between branching intensity and cross-sectional area, and the common slope of the regressions was significantly less than -1 (p < 0.001). The intercept for the regression relationship between twig area and branching intensity was the same among plants in communities of different density intervals (p > 0.05), suggesting that plants in a high density community do not deploy more twigs per twig size than in a low density community. In summary, this study demonstrated that plants responded to changes in individual density by maintaining an invariant regression slope for the twig size-leaf size relationship and the twig size-branching intensity relationship, and that the Corner’s rules were not affected by individual density of the communities in the Tiantong region. However, changes in the intercept of the regression between twig size and leaf size indicate that deployment strategies between twig and leaf sizes could be adjusted with increasing individual plant competition, thus structuring species coexistence through niche differentiation.

Key words: allometric growth, community density, Corner’s rules, individual competition, twig-leaf relationship