植物生态学报 ›› 2014, Vol. 38 ›› Issue (7): 665-674.DOI: 10.3724/SP.J.1258.2014.00062

• 研究论文 • 上一篇    下一篇

浙江天童木本植物Corner法则的检验: 微地形的影响

史青茹1,2, 许洺山1,2, 赵延涛1,2, 周刘丽1,2, 张晴晴1,2, 马文济1,2, 赵绮3, 阎恩荣1,2,*()   

  1. 1华东师范大学环境科学系, 上海 200241
    2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
    3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(2012C10027)

Testing of corner’s rules across woody plants in Tiantong region, Zhejiang Province: effects of micro-topography

SHI Qing-Ru1,2, XU Ming-Shan1,2, ZHAO Yan-Tao1,2, ZHOU Liu-Li1,2, ZHANG Qing-Qing1,2, MA Wen-Ji1,2, ZHAO Qi3, YAN En-Rong1,2,*()   

  1. 1Department of Environment Science, East China Normal University, Shanghai 200241, China
    2Tiantong National Forest Ecosystem Observation and Research Station, Ningbo, Zhejiang 315114, China
    3Forestry 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:

枝叶的大小和数量关系表征了植物应对环境胁迫的水力结构特征, 当前, 对其在微生境间的变化规律不太清楚。该研究在浙江天童常绿阔叶林中, 按照地形的凸凹差异, 各选择了10个群落, 采用标准化主轴估计方法, 分别比较了植物枝大小(横截面积)-叶大小(总叶面积)关系、枝大小(横截面积)-枝数量(枝稠密度)关系和叶大小(单叶面积)-叶数量(生叶强度)关系在两类生境的变化。结果发现: 1)在两类生境中, 枝横截面积和总叶面积显著异速正相关(p < 0.001), 存在显著大于1的共斜率; 其回归方程截距在凹型生境显著大于凸型生境, 表明在一定枝大小下, 凹型生境比凸型生境的植物枝条支撑更大的叶面积; 2)枝横截面积与枝稠密度显著负相关(p < 0.001), 且在两生境间存在显著小于-1的共斜率; 回归方程截距在生境间无显著差异(p > 0.05), 表明凹型与凸型生境的植物在单位大小枝条配置的分枝数相同; 3)单叶面积与生叶强度显著负相关(p < 0.001), 且也在生境间存在显著小于-1的共斜率; 回归方程的截距在凹型生境显著大于凸型生境, 表明在叶片大小相同时, 凹型比凸型生境的植物在单位大小枝条上支撑的叶片数更多。综上, 与凸型生境相比, 凹型生境植物单位大小枝条更倾向于支持数量较多的大叶片。本研究证明, 植物Corner法则和叶大小-叶数量的权衡在局域尺度也具普适性。枝叶大小和叶数量配置的调整体现了植物水力结构对凸凹生境不同水分供应的选择偏好。

关键词: 异速生长, Corner法则, 生态权衡, 微地形, 枝叶关系

Abstract:

Aims The size and quantity relationships between twigs and leaves can be used to describe the hydraulic properties of plants in response to environmental stresses. The objective of this study was to examine how twig-leaf relationship would vary with changes in micro-habitat conditions.
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), sub-twig cross-sectional area (sub-twig size), individual leaf area, total leaf area (leaf size per twig), the number of twigs at a given twig size (twig intensity), and the number of leaves at a given twig size (leafing intensity) across individual woody plants on 10 plots in each of the convex and concave habitats within an evergreen broad-leaved forest. The standardized major axis (SMA) analysis was conducted to determine the scaling relationships between twig size and leaf size, between sub-twig size and twig intensity, and between leaf size and leafing intensity.
Important findings Significant, positive allometric relationships between twig cross-sectional area and total leaf area were found in plants in both types of micro-habitats (p < 0.001). There was no significant difference between the two micro-habitats in the slope of the regression between twig cross-sectional area and total leaf area, and the common slope of the regressions was significantly greater than 1 (p < 0.001). The intercept was significantly greater in plants of the concave habitat than in plants of the convex habitat (p < 0.001), indicating that plants in a concave habitat support greater total leaf area at a given twig size than in a convex habitat. Significant, negative allometric scaling relationships were found between twig size and twig intensity in plants in both micro-habitats. There was also no significant difference between the two habitats in the slope of the regression between twig size and twig intensity, and the common slope of the regressions was significantly less than -1 (p < 0.001). The similar intercept in the regression relationship of twig area and twig intensity between the two habitats suggests that plants deploy similar amount of sub-twigs per twig size in both types of habitat. In addition, significant, negative allometric scaling relationships between leaf size and leafing intensity were found to be consistently conserved across micro-habitat types, with the common slope being smaller than -1. A higher value of y-intercept in the scaling relationships of leaf area vs. leafing intensity for plants in the concave habitat indicates that at a given leaf area, more leaves were supported by plants in a concave habitat than in a convex habitat. Overall, plants in a concave habitat tend to deploy more large leaves per twig size than those in a convex habitat. This study demonstrated that both the Corner’s rules and the leaf size-number trade-offs could be generalized to apply at the small local spatial scales. The magnitude and quantitative adjustment of twig-leaf deployment manifests a selection preference of hydraulic properties of plants in coping with changes in water availability between concave and convex habitats.

Key words: allometric growth, Corner’s rules, ecological trade-offs, micro-topography, twig-leaf relationship