The Resources And Distribution Characteristics Of Ancient Trees In The Southeast Of Shanxi Province

Ancient trees specifically refer to trees that are more than 100 years old and have been preserved under the influence of human culture.Ancient trees play an incalculable role in ecological environment,social culture,scientific research,etc.,and they have always been a popular area for many scholars to conduct research.This article takes ancient trees in the southeast of Shanxi as the research object,and investigates the species composition,resource structure,distribution characteristics and diversity pattern of ancient trees,so as to fill the gaps in the research of ancient tree resources in the southeast of Shanxi.Provide a basis for protection of old trees in the district and urban ecological construction.The main findings are as follows:(1)A total of 4312 ancient trees were investigated in the southeast of Shanxi Province,belonging to 108 species,63 genera and 37 families.The origin of the flora in the southeast of Shanxi is ancient.According to the type of family distribution,it is mainly distributed in the temperate zone(13 families,35.13%)and tropical-subtropical-temperate(12families,32.43%);according to the genus In terms of the type of distribution area,the distribution is mainly in the northern temperate zone(30 genera,47.62%)and the world(6 genera,9.52%).(2)The statistical results of tree height,crown width,diameter class at breast height and tree age of ancient trees in southeast Shanxi showed a partial normal distribution.The tree heights were mainly concentrated in8.0-17.0m,and the average tree height was 13.2±1.5m;Mainly concentrated in 9.0-12.0m,the average crown width is 11.7±2.4m;the breast diameter is mainly concentrated in 70-310 cm,the average breast diameter is 78.1±24.2cm;the second and third grade ancient trees have the largest proportion,while the first grade ancient trees are relatively more less.(3)There are big differences in the number of old trees in various towns in the southeast of Shanxi,but the density of old trees is relatively small,less than 3 plants/km~2,and there is little difference between towns and towns.Manghe Township has the largest number of old trees,and the least is Baichi Town,Huangshan Town,Shuzhang Town,Beijie Street,etc.;the towns with a higher density of old trees are Beitanche Town,Manghe Town and Dongjie Street.From the perspective of habitat distribution,the old trees in southeast Shanxi are mainly concentrated in habitat types such as settlements,religious buildings and cemeteries,accounting for 58.72%,14.7%,and 11.0%,respectively,while the distribution of old trees in other habitats is less.Ancient trees are mainly distributed in the area,mainly in the middle altitude area(500～1500m),accounting for 62.96%of the total species and 97.26%of the total number of trees.(4)The correlation between the diversity of ancient trees and the altitude,latitude,and population density of each township is as follows:as the altitude increases,the species diversity of ancient trees decreases first and then rises;as the latitude increases,the ancient The diversity of tree species did not change significantly;with the increase of population density,the species diversity of ancient trees showed a downward trend.