QUANTITATIVE FEATURES OF POPULATIONS OF PINUS TABULAEFORMIS AND P. ARMANDII REGENERATED FOLLOWING WATER DAMAGE AT QINLING MOUNTAIN, CHINA

doi:10.3773/j.issn.1005-264x.2008.01.011

Abstract

Abstract:

Aims Comparison of populations of different plant species can reveal the formation mechanism and the influencing factors of the populations. We compared quantitative features of populations of Pinus tabulaeformis and P. armandii, which are the dominants in naturally regenerating communities, following water damage 17 years ago in part of the Fanjiazhuang section of the Caiyuhe Watershed of Qinling Mountain. We asked whether biological features of P. tabulaeformis and P. armandii influence the population size, age structure and population survival dynamics.
Methods We measured the height, basal diameter and age (number of whorled branches) of two individuals in a total plot area of 11 900 m² in 2005.
Important findings As a result of faster height and lateral growth, P. tabulaeformis had greater mean height and basal diameter than P. armandii, and individuals occupied larger vertical and horizontal space. The two populations had different height, diameter and age structures, and no consistenay, which indicated that size structure did not always reflect the age structure. The populations had different age structures, with that of P. tabulaeformis skewed to older trees and that of P. armandii in a near normal distribution. The age structure of P. armandii population was influenced by slope aspect, but that of P. tabulaeformis population was not. Both survivorship curves were the type Ⅱ, which indicated that both populations had similar survival dynamics. Therefore, the different biological characteristics of P. tabulaeformis and P. armandii led to different population size and age structure features, but not survival processes. This implied that environmental factors were the main determinants of population survival dynamics.

Key words: Qinling Mountain, population, quantitative features, Pinus tabulaeformis, P. armandii, water damage

FEI Shi-Min, HE Ya-Ping, CHEN Xiu-Ming, JIANG Jun-Ming, GUO Zhi-Hua. QUANTITATIVE FEATURES OF POPULATIONS OF PINUS TABULAEFORMIS AND P. ARMANDII REGENERATED FOLLOWING WATER DAMAGE AT QINLING MOUNTAIN, CHINA[J]. Chin J Plant Ecol, 2008, 32(1): 95-105.

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URL: https://www.plant-ecology.com/EN/10.3773/j.issn.1005-264x.2008.01.011

https://www.plant-ecology.com/EN/Y2008/V32/I1/95

Figures/Tables 10

Table 1 Community and environment characteristics of the main riparian ecosystems regemerated following water damage in Fanjiazhuang section, Caiyuhe Watershed

	筒子沟 Tongzigou	崔家后沟 Cuijiahougou	下头沟 Xiatougou	阳坡沟 Yangpogou	庙沟 Miaogou	河道 River road
郁闭度 Canopy density	0.36	0.40	0.20	0.50	0.45	0.10
乔木高度 Height of trees (m)	6.07	5.50	5.25	8.00	9.30	12.00
灌木高度 Height of shrub (m)	2.02	2.40	1.65	3.00	3.10	2.10
灌木盖度 Coverage of shrub (%)	65.0	56.3	32.5	53.0	56.3	20.0
草本高度 Height of grass (m)	0.98	1.00	0.95	1.00	0.90	1.20
草本盖度 Coverage of grass (%)	82.0	84.4	90.0	83.0	72.5	100.0
裸石面积 Area of bare land (%)	65.0	35.6	35.0	60.0	55.0	90.0
坡向 Aspect	西 West	西 West	西 West	东 East	东 East	-
长度 Length (m)	500	400	400	300	600	700

Fig.1 Distribution sketch map for study sites of Pinus tabulaeformis and P. armandii populations in Fanjiazhuang section, Caiyuhe Watershed

Fig.2 Density dynamics of Pinus tabulaeformis and P. armandii populations regenerated following water damage

Fig.3 Structure of height and base diameter grade in Pinus tabulaeformis and P. armandii populations regenerated following water damage

Fig.4 Age structure of Pinus tabulaeformis and P. armandii populations regenerated following water damage

Fig.5 Species differences of age structure between Pinus tabulaeformis and P. armandii populations regenerated following water damage

Fig.6 Aspect differences of age structure between Pinus tabulaeformis and P. armandii populations regenerated following water damage

Fig.7 Comparison within species among the diameter, height and age structures of Pinus tabulaeformis and P. armandii populations regenerated following water damage

Fig.8 Survival curve of Pinus tabulaeformis and P. armandii populations regenerated following water damage

Fig.9 Survival curve of Pinus tabulaeformis and P. armandii populations regenerated following water damage in sunny and shady slope

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