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Spatial Pattern Analysis in a Natural Secondary Betula-Abies Forest at Sub-Alpine Area of Western Sichuan, China

Author: ZuoNing
Tutor: LiuShiRong;ShiZuoMin
School: Chinese Academy of Forestry
Course: Ecology
Keywords: Kawanishi Subalpine Natural secondary forest Vegetation restoration Pattern Analysis Spatial distribution pattern Spatial association Natural regeneration Interspecific competition Remaining trees
CLC: S718.542
Type: PhD thesis
Year: 2009
Downloads: 282
Quote: 3
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Abstract


The spatial pattern of forest communities populations of their own characteristics, the result of the combined effects of interspecific relationships and environmental conditions. The spatial pattern of the study populations of forest communities can predict the trend of forest succession, and provide theoretical guidance for the restoration of degraded ecosystems and sustainable forest ecosystems operate. Dark coniferous forests of the subalpine of Western region has important ecological, social and economic value, however, has led to excessive deforestation and irrational land use to reduce the large area of ??virgin forest, a widely distributed in different recovery stages of natural secondary forest. The development of natural secondary forest by virgin forest destruction has become the main forest landscape of western Sichuan, China. In the past we focused on subalpine of Western Sichuan virgin forest, while little is known about these anthropogenic interference degraded forest vegetation. In this study, an altitude of 3300 m in the the Kawanishi miyaluo region shady slope, select 4 ha red birch - Abies natural secondary forest plots (N31 ° 42'18 .4 \species individual space positioning investigation mainly adopts the point pattern analysis method (including of Ripley's L-function and O-ring statistics of the O-function), to study the: (1) community structure and species composition characteristics; (2) Minjiang fir population of The spatial distribution pattern and intraspecific association; (3) Minjiang fir natural regeneration impact factor; (4) the dominant tree species in interspecific competition; reservations (5) harvesting wood effect. The purpose of this study is to explore the natural recovery of natural secondary forest driving force mechanism, Subalpine dark coniferous forest conservation and restoration to provide a scientific basis. The main findings are as follows: (1) red birch and fir Minjiang red birch - the dominant species of natural secondary forest communities of Minjiang fir, red birch basal area accounted for 49.0%, 28.9% Minjiang fir. The red of birch populations diameter class distribution presents a single peak, the population Succession recession. Minjiang fir population size class distribution was inverted \The point maps show that the dominant species of different diameter and their spatial distribution is also different, but showed some aggregation and spatial heterogeneity. (2) Minjiang fir population showed aggregated distribution, most of its diameter class showed aggregated distribution. Gathered strength as the scale increases first and then decreases, and tends to a random distribution, there is a transition to a random distribution of a specific scale: small trees: 63 m, in the tree 87 m. Each diameter class in small scale, a strong positive correlation with size increases, the spatial correlation tends to zero, none of the negative correlation at all scales, Minjiang fir species within coordination. Of each diameter class gathered strength scale is as follows: seedlings: 28 m; of saplings: 29 m; small trees: 15 m; in tree: 34 m; big tree: 49 m. Trees with trees on all scales are significant positive association; seedlings only in the scale of 7 m and saplings significant positive association. Seedlings and trees, trees and small trees in all scales are not significantly related. (3) red birch - natural secondary forest of the Minjiang fir Minjiang fir seedlings and saplings quantity, age was a continuous distribution, Minjiang fir updated good. Found no red birch tree height less than 2 m individual plots, the poor red birch updates. For Minjiang fir seedlings, 1 year old seedlings accounted for 62.45% of the total number of seedlings, seedlings and saplings for 2.30% of the total number of seedlings accounted for 2 years. 86.70% 1-year-old seedlings, and 81.08% for more than 2 years old seedlings were grown in moss. We focus on a small scale within the spatial correlation, the dominant species of different diameter trees and Minjiang fir seedlings, saplings space correlation performance of different. Minjiang fir seedlings and small trees, tree, trees, respectively, 0 ~ 7 m, 0 ~ 8 m and 0 ~ 8 m scale performance is significantly negative association. Minjiang fir saplings and small trees, tree, trees, respectively, in the 0 ~ 11 m, 0 ~ 13 m, 0 ~ 11 m scale showed a significant positive correlation. At all scales, Minjiang fir seedlings and saplings of red birch small trees tend unrelated. Minjiang fir seedlings, saplings and red birch tree 0 ~ 8 m, 0 ~ 34 m scale showed a significant negative correlation. Minjiang fir seedlings, saplings and red birch trees in all scales showed a significant negative correlation. The key factor to affect the Minjiang fir natural regeneration the moss layer coverage, fallen trees volume of mother trees (DBH ≥ 16.5) density, Fargesia cover and tree canopy density. The moss layer coverage, fallen trees volume and seed tree density plays a role in promoting natural regeneration Minjiang fir of Fargesia cover and tree canopy density of Minjiang fir natural regeneration plays an impediment. (4) Spatial Pattern Analysis of the results reveals the fierce competition between the red birch and fir Minjiang. Between dominant populations of primary forests at all scales performance non-associated natural secondary forest red birch and Minjiang fir performance is a significant negative correlation at all scales. Minjiang fir and red birch trees in all scales are randomly distributed, the distribution of the remaining diameter class gathered in a small scale, with the scale increases, tends to be distributed randomly and evenly distributed, the largest gathering strength diminishes with increasing diameter class. Minjiang fir species, mainly related to the positive association of small-scale, the red birch intraspecific associated mainly in small-scale negative association. Space between the two populations of the same diameter class, trail class, middle diameter and large diameter class, respectively associated, main negative associated and non-associated. Mainly to the negative association between the two populations of different diameter, the diameter classes greater the difference, the stronger its negative association. (5) The remaining trees of large diameter class distribution has a significant impact on other trees in diameter class space. Large diameter class, red birch wood, with its trees and in tree reserved 0 ~ 8 m and 0 ~ 9 m scale performance is a significant negative correlation. Minjiang fir diameter of the remaining trees and their seedlings in a scale of 0 ~ 8 m negative association. Minjiang fir diameter of the remaining trees and their saplings and small trees, respectively, in the 0 ~ 11 m and 1 ~ 9 m scale positive association. Minjiang fir diameter class reservations wood tree in a scale of 0 ~ 14 m, no significant spatial association. Red birch retain the large diameter wood and Minjiang fir seedlings, saplings, trees and tree space negative correlation at all scales are. Minjiang fir large diameter remaining trees and red birch small tree in a scale of 0 ~ 4 m for the negative association. Large diameter class remaining trees to promote the advantages of late-successional species Minjiang fir updates and growth restricted updates and growth of pioneer species red birch.

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CLC: > Agricultural Sciences > Forestry > Forestry basic science > Forest Biology > Forest Ecology > Forest communities > Community structure , characterized
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