| In order to better promote the regeneration and population of natural forest of Phoebe bournei,this paper takes the natural forest of Phoebe bournei as the research object,through the field investigation and research on the natural community of Phoebe bournei in Denglu Village,Taijiang,Guizhou,analyzing the characteristics of the natural population of Phoebe bournei and exploring The spatial distribution law of Phoebe bournei population reveals the characteristics of Phoebe bournei seedling renewal.It aims to provide theoretical basis and technical guidance for the management and protection of Phoebe bournei natural forest and the establishment of artificial forest cultivation technical measures;at the same time,comprehensive analysis of the natural renewal of Phoebe bournei seedlings The relationship between it and its impact factors,to clarify the main impact factors of its natural regeneration,and to provide reference for promoting the formulation of natural regeneration management measures,which has important practical significance for the manageent and protection of Phoebe bournei natural forest.The main findings are as follows:(1)The age structure of Phoebe bournei population has an inverted “J” type distribution,the number of individuals is mainly concentrated in the first and second age classes,and there are few adult individuals;Higher;the survival curve tends to Deevey-? type,and the mortality rate is more stable;the population of Phoebe bournei has the dynamic characteristics of sharp decline in the early stage,stability in the middle and late stages,and decline in the late stage.The population of Phoebe bournei is highly sensitive to external disturbances.(2)The seedlings and middle trees of Phoebe bournei show cluster distribution at all scales;the young trees show cluster distribution at large scales and the random distribution at small scales;the big trees show random distribution at all scales.Big trees and seedlings show a negative correlation on a small scale and a positive correlation on a large scale;big trees and young trees,large and medium trees show a positive correlation and no correlation on a small scale,and large scales show a negative correlation;middle tree and young tree,and middle tree and seedling show negative correlation on all scales;young tree and seedling show positive correlation on small scale,and large scale show negative correlation.(3)The number of young plant renewal is the highest in the first grade,with the increase of age,the number of young plant renewal shows a downward trend.The variation degree of the renewed seedling density,height and ground diameter is extremely small,but the variation range is different.The renewal density has a smaller variation range than the seedling height and ground diameter.The density of regenerated seedlings at the farthest distance from the mother tree is the lowest,the average ground diameter is larger and the seedlings are higher;the regenerated seedlings of Phoebe bournei mainly complete the renewal process in cluster distribution.(4)The influence factor of Pearson correlation analysis and the growth status of the regenerated seedlings show that the distance between the nearest mother tree and the average density of the regenerated seedlings are extremely significantly negatively correlated,and are significantly positively correlated with the average seedling height and ground diameter;Thick layer thickness is significantly positively correlated with average density;slope is significantly negatively correlated with average seedling height and ground diameter;litter thickness is significantly negatively correlated with average density;soil layer thickness,soil water content,air humidity,understory There was no significant correlation between the surface temperature and seedling height,ground diameter,and density;among them,the light transmittance had a very significant negative correlation with the average density of the renewed seedlings,and a very significant positive correlation with the average seedling height and the average ground diameter.Principal component analysis results show that light transmittance is the most critical factor affecting seedling regeneration,followed by the thickness of the humus layer.(5)The competition of Phoebe bournei population mainly comes from intra-species competition;the effective distance of the base plant adjacent to interference is 3-6m,and the effective range of the base plant is gradually shortened with the increase of the diameter level.The strength of competition and the diameter of the breast have a power function relationship.As the diameter of the breast increases,the intensity of neighbor interference decreases.(6)The regeneration of Phoebe bournei seedlings is influenced by many factors such as new biological characteristics and environment.It is imminent to artificially promote the regeneration of natural forests and strengthen the conservation of natural populations of Phoebe bournei.Therefore,it is recommended to consider the following three population protection measures: First,to carry out scientific and reasonable human interference,improve the light transmittance under the forest,remove the relative number of competing trees,increase the survival rate of young individuals,and provide them with a suitable living environment;The second is to carry out research on the bio-ecological characteristics of Phoebe bournei,grasp the regularity of the bio-ecological characteristics of Phoebe bournei with age and environment,adjust the inter-and intra-species relationships of Phoebe bournei population in time,and maintain The survival needs of environmental resources;the third is to implement on-site protection of the existing natural population of Phoebe bournei,formulate scientific and effective management measures,prohibit arbitrarily logging,strengthen legal publicity and endangered plant protection publicity,enhance the villagers 'legal awareness and protection awareness,Consciously protect rare and endangered species. |
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