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。
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, nosignificant 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）. Th
出处
《植物生态学报》
CAS
CSCD
北大核心
2014年第7期655-664,共10页
Chinese Journal of Plant Ecology
基金
国家自然科学基金(31270475和31070383)
宁波市重大科技攻关项目(2012C1-0027)
关键词
异速生长
群落密度
Corner法则
个体竞争
枝叶关系
allometric growth
community density
Corner＇s rules
individual competition
twig-leaf relationship
