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Study on Characteristics of Vegetative Propagation and Population Regeneration of Quercus Variabilis

Author: YangBaoLin
Tutor: ZhangWenHui
School: Northwest University of Science and Technology
Course: Forest cultivation
Keywords: Quercus variabilis Populations Diameter class structure Stump sprouting seedlings Clone
CLC: S792.18
Type: Master's thesis
Year: 2011
Downloads: 23
Quote: 0
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Abstract


Cork oak (Quercus variabilis BI.) Is widely distributed in China's 22 provinces, autonomous regions, the important cork, tannin, energy forest species, ecological and environmental protection, economic development has played a huge role. Along environmental gradients from this study, the population distribution of the core area Qinba mountain to the distribution of marginal zone Loess Plateau, through the typical kind of investigation, consisting of Quercus variabilis population seedlings number, origin, growth characteristics, different interference conditions different origin in young individuals competitive relationship, stumps sprouting seedlings and foundation Meng Miao's growth law clarifies the asexual reproduction in populations of the update process important role, put forward measures to promote asexual reproduction, Quercus variabilis population recovery as well as secondary Tending theoretical basis. The main conclusions are as follows: (1) in the Huanglong Mountain, northern Qinling Mountains and the southern slope of Qinling Quercus variabilis population seedlings the seedlings, of stumps sprouting seedlings and foundation sprouting seedlings, root sprouting seedlings are not found in the study area; 1 ~ 8a young Age ontogenetic stage, stumps sprouting seedlings composed gradual increase in the proportion of the seedlings composition ratio is decreasing; at the same age, the average basal diameter stumps sprouting seedlings, average height and average crown significantly higher than the seedlings and foundation Meng Miao, the seedlings and foundation sprouted seedlings the difference was not significant, rapid growth Stump sprouting seedlings, seedling foundation sprouting seedlings grow slowly. The conversion rate of the overall population of the three regions and seedling populations are in I, II diameter class (seedling mortality is highest), the conversion rate gradually increased with increasing age, (seedling mortality decline) adjacent minimum diameter of the conversion rate initiation of population than seedling populations, indicating that the initiation of the population to make up for the lack of seedling populations, increasing the overall number of populations, play an important role in population recovery. (2) human interference of Quercus variabilis population larger A initiation can form a larger population, smoothly through \B, Quercus variabilis Ⅰ number of seedlings sprouting small number. Quercus variabilis updates in grade Ⅱ seedling stage presence of significant \and the the populations B seedlings dominance is 35.79%, 64.21% sprouting dominance Update dominant cork oak forest in the interference condition sprouted quickly restore favorable woodland; seedling advantage ban was elevated, Population genetic diversity to maintain and the Quercus variabilis quality improve beneficial. (3) the number of stumps sprouting seedlings, basal diameter and height is proportional to the diameter of the stumps; stumps sprouting seedlings average basal diameter, average height and average crown are sunny slopes greater than shady slope; same stump sprouting annual seedling number and sprouting seedlings basal diameter (height) growth was negatively correlated; 4a raw stumps sprouting seedlings (stumps diameter of 10 to 20 cm) than in the sunny mortality of shady slope small; With deforestation Views increase stumps germination rate decreased significantly. Cut down the number of small diameter (1 ~ 10 cm) stumps germination rate, while the large diameter (10 ~ 20 cm) low stumps sprout. 1 ~ 2a the Health foundation Meng seedlings number of mother trees DBH and the mother tree height, number of foundation Meng Miao as the mother plant height and base diameter increases and increased expression available regression equation: N = -0.270 0.439D-0.025D ??~ 2 0.001D ~ 3 (R ~ 2 = 0.910), N = -2.598 0.906H-0.062 H ~ 2 0.002 H ~ 3 (R ~ 2 = 0.901).

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CLC: > Agricultural Sciences > Forestry > Forest tree species > Broad-leaved trees > Oak
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