Population Structure And Its Dynamics Of Pinus Taiwanensis In Wuyi Mountain

Pinus taiwanensis is a unique tree to china, and it is a fine tree of timber and has high ecological benefits. So it is very significant to carry on ecological study on Pinus taiwanensis. In this thesis, based on the data of field investigation, population structure and dynamics, fractals of crown breath, self-thinning law, density effect and modeling crown profile have been discussed. So it could provide theory for Pinus taiwanensis forest plantation and study in the future.Based on the data on Pinus taiwanensis population in Wuyishan National Nature Reserve and the life table of population and the theory of survival analysis, the static life table of Pinus taiwanensis Population was worked out through "space take the place of time" method, and the curves of lose rate, survival, mortality rate, and survival function of the density change of the population's life course were drown, at the same time, the author analyzed the population dynamics by spectral analysis method. The results show that the survival curve of the population generally trended to the Deevey II～III, and there was two peaks of mortality. The functions used in static life table could well explain the structure and dynamics of Pinus taiwanensis population. The results from spectral analysis showed that the characteristic of quantitative fluctuation of Pinus taiwanensis population was multi-harmonic superposition with minor cycle in the major cycle.The niche breadth values, niche similarity and niche overlap values of the main tree populations in Pinus taiwanensis community were studied. The results showed that: the niche breadths of Pinus taiwanensis, Rhododendron fortunei, Rhododendron mariesii and Stranvaesia davidiana were great, the niche breadth of Rhododendron simiarum was the smallest. The niche similarity among the species with broad niche breadths was much greater, and the niche similarity among the species with small niche breadths was lower. Generally, the niche overlaps in Pinus taiwanensis community were low. The niche overlaps among the species with broad niche breadths were greater, and the niche overlaps among the species with small niche breadths were lower.In this paper, adopting the 2×2 contingenecy table, the analysis of different indices including the analysis of Variance,X~2 test, association coefficient (AC) , Jaccard index and point correlation were used to investigate the species association between 13 dominant populations in Pinus taiwanensis community. The result show that there exist no correlation among the 13 dominant populations, which suggests that the Pinus taiwanensis community is succession. The X~2 test showed that among these 13 dominant populations, 1 species pair exhibited highly significant positive association, another 3 species pairs showed significant positive association, 1 species pair exhibited highly significant negative association, and 5 species pairs showed significant negative association. Most of the total 78 species pairs did not show significant association, which may be related to the seral of the community and the ecological characteristics of investigated species. Based on the results, it might be inferred that the community was at a successional stage.Two theoretical models, Poisson, Negative Binomal Distribution are used, the spatial pattern of Pinns taiwanensis, Rhododendron fortunei and Rhododendron mariesii is studied. The results indicated that the population spatial pattern have consistency with the bionmial distribution, so the spatial pattern of the population is considered as contagious distribution. The index C are 4.0950, ? 5.0373, 6.0741; I are 3.0950, 4.0373, 5.0741; I_δare 1.1875, 3.1697, 2.1930; PAI are 1.1866, 3.1483,2.1865; Ca are 0.1897, 2.1823, 1.2045.Studying spatial distribution of plant population with different crown breath can give the information for the mechanism of population distribution. Fractal geometry of crown is considered to be a very useful tool for dealing with the distribution of crown. In this paper, the fractal dimensions of different species crown in the Wuyi Mountain Pinus taiwanensis forests were caculated and compared, and also compared with the fractal dimension of Shouning and Pingnan Pinus taiwanensis. The results indicated that the fractal dimension of Wuyi Mountain Pinus taiwanensis was larger than the others; the fractal dimensions of different species in the Wuyi Mountain were larger, which showed that the competition of variable populations was not intense.Density-dependent mortality is caused by the increase of tree size. In the paper, the author chose average diameter, basal area of average individual and total stand basal area for indicators of the size to express the relationship between the number of trees and the size. Based on the famous -3/2 power rule, equations relating the number of trees to the average diameter, basal area of average individual and total stand basal area were established. Discussing the application of Pinus taiwanensis during their self-thinning, which could provide theory for forest management.The relationship between stand volume, stand density and stand dominant height of Pinus taiwanensis plantation was studied. The best density effect model of natural Pinus taiwanensis was selected and analyzed, and the values of the productive elasticity and marginal yield of natural Pinus taiwanensis for the model were calculated.Models for estimating crown profile of primary branches within live crown were developed in Pinus taiwanensis plantation. Crown profile models , including branch length, angle of origin and branch chord length. This crown attributes of primary branches for a specified tree increase with the depth into crown (DINC) increasing. DBH, HT and crown width (CW) were adequate variables of tree for summarizing the effects of external conditions on crown profile. The test result using Deviance Statistical and precisipn tests from the independent test data set showed that these models were suitable for predicting the crown profile in Pinus taiwanensis. Models precision exceeded 95 percentages. Overall, the models were suitable in describing the trends and inherent variabilility of crown profiles for Pinus taiwanensis plantation.