秦岭南坡栓皮栎实生苗的构型分析

doi:10.11707/j.1001-7488.20150920

Abstract

Abstract:

[Objective] The spatial architecture of plant population is a final product of plant-environment interaction and mutual adaption. In order to illustrate the relation between habitat and architecture, seedlings of Quercus variabilis in the shady and sunny slopes were studied. The study will therefore provide evidences for optimization of forest structure and managemental measures. [Method] By surveying nine quadrats, architectural characteristics (growth characteristics, branching characteristics, leaf characteristics and biomass allocation) of 1-10 years old seedlings of Q. variabilis in the shady slope and sunny slope were studied.[Result] The average base diameter and height of Q. variabilis seedlings were larger in sunny slope than in shady slope. On the contrary, the crown width was larger in shady slope than in sunny slope before 9 years. No significant differences of base diameter were found between the two habitats, but the tree height at 7 to 10 years old and the crown width at 3 and 8 years old significantly differ between the two habitats. Due to the differences of sunlight intensity between the two habitats, Q. variabilis seedlings have evolved different adaptive strategies. In the shady slope, the first order branch and the third order branch of Q. variabilis seedlings appeared earlier than that in the sunny slope. The overall bifurcation ratio and the stepwise bifurcation ratio (R_1:2) were larger in sunny slope than in shady slope, while the length and the angle of the first order branch were larger in shady slope than in sunny slope. The leaf length, leaf width, leaf area and leaf area index of Q. variabilis seedlings appeared to be larger in shady slope than in sunny slope. In the two habitats, the ratio of length to width of leaf varied from 2.00 to 2.61, indicating that the characteristics is under genetic control. The biomass of leaf, stem and branch increased in exponential function in the two habitats. The difference between the two habitats was significant after 6 years (P<0.05). And the ratio of root to shoot was significantly different between the two habitats during the period from 1 to 7 years old (P<0.05). To ensure survival, it distributes more dry matter to root before 8 years old. The peak value of biomass ratio of each organ appeared at different age. The peak value of leaf biomass ratio and branch biomass ratio respectively appeared at 4 and 8 years old in the shady slope. However in the sunny slope the peak value of leaf biomass ratio and branch biomass ratio respectively appeared at 3 and 9 years old. The stem and leaf biomass proportions significantly differed in the two habitats at 1 to 4 years old, but the difference decreased between the two habitats with the increase of age. There was a significant difference after 8 years old between the two habitats.[Conclusion] The growth performances of the seedlings were superior in the sunny slope to those in the shady slope. But to obtain more light interception, Q. variabilis seedlings developed strong branching and larger leaf area. In order to make full use of sunlight, the seedlings of Q. variabilis evolved different architectural characteristics for adaptation to different habitats.

Key words: Quercus variabilis, seedling, habitat, architectural analysis

CLC Number:

S718.54

Hu Xiaojing, Zhang Wenhui, He Jingfeng. Architectural Analysis of Quercus variabilis Seedlings in the South Slopes of Qinling Mountains[J]. Scientia Silvae Sinicae, 2015, 51(9): 157-164.

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Architectural Analysis of Quercus variabilis Seedlings in the South Slopes of Qinling Mountains

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