INFLUENCES OF SUBSTITUTING SIZE VARIABLES FOR AGE ON POPULATION SURVIVAL ANALYSIS: A CASE STUDY OF PINUS TABULAEFORMIS AND P. ARMANDII IN QINLING MOUNTAIN, CHINA

doi:10.3773/j.issn.1005-264x.2008.02.024

Abstract

Abstract:

Aims Our objectives were to 1) explore the feasibility of using individual height and basal diameter as substitutes for age, and 2) determine the influence of using these parameters on survival curve analysis for Pinus armandii and P. tabulaeformis populations in an area damaged by water disaster in the northern Qinling Mountain.
Methods We investigated two dominant species, P. tabulaeformis and P. armandii, which had regenerated after damage by water disaster 17 years earlier. We measured height, basal diameter and age of two species in 6 plots (total plot area was 11 900 m ²). We determined age by counting number of whorls of branches.
Important findings It was infeasible to use basal diameter and tree height in place of age for P. armandii because the relationship to age was an exponential function for both parameters; therefore, we used logarithmic values for basal diameter and tree height. In contrast, the functions were linear for P. tabulaeformis. The survival curves were all linear type with no type differences between base diameter, tree height and factual age. Our study indicates that it is feasible to use basal diameter and tree height as indices for factual age when the relationships of basal diameter and tree height to age are linear. Investigation of relations of age and size and their influential factors is important for the analysis of plant population demography.

Key words: Qinling Mountain, population, static life table, Pinus armandii, P. tabulaeformis

HE Ya-Ping, FEI Shi-Min, JIANG Jun-Ming, CHEN Xiu-Ming, ZHANG Xu-Dong, HE Fei. INFLUENCES OF SUBSTITUTING SIZE VARIABLES FOR AGE ON POPULATION SURVIVAL ANALYSIS: A CASE STUDY OF PINUS TABULAEFORMIS AND P. ARMANDII IN QINLING MOUNTAIN, CHINA[J]. Chin J Plant Ecol, 2008, 32(2): 448-455.

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URL: https://www.plant-ecology.com/EN/10.3773/j.issn.1005-264x.2008.02.024

https://www.plant-ecology.com/EN/Y2008/V32/I2/448

Figures/Tables 6

Fig.1 Survival curves of Pinus tabulaeformis and P. armandii populations regenerated following the water disaster

Fig.2 S(i) of Pinus tabulaeformis and P. armandii populations regerterated following the water disaster

Fig.3 F(i) of Pinus tabulaeformis and P. armandii population regerterated following the water disaster

Fig.4 F(ti) and λ(i) of Pinus tabulaeformis and P. armandii population regerterated following the water disaster

Fig.5 The relation of height and base diameter of Pinus tabulaeformis and P. armandii to age in the area damaged by the water disaster

Fig.6 Survival curves of Pinus armandii populations regenerated following the water disaster (corrected)

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