Research On Nondestructive Testing And Evaluation Method Of Tree Growth Status In Yong Tomb

Yong Tomb is one of the mausoleums of the Ming Tombs.It has a history of more than 450 years and is an important cultural relics architecture.There are many trees growing in Yong Tomb Mausoleum,including ancient trees and big trees.These trees grow on the ground,Lingen temple,Lingen Hall,horse road,horse road outer wall,square city outer wall,Baoding,etc.,which forms a beautiful natural scenery and also preserves cultural relics and buildings Has produced many negative effects.Scientifically assessing the growth of trees in the mausoleum is an important basic work to protect the cultural relics and trees in the mausoleum at the same time.So far,Yong Tomb trees have not been systematically tested and evaluated for growth.This paper intends to use stress wave defect detection technology,stress wave tomography detection technology,micro-drill resistance detection technology,etc.,to take the trees growing in Yong Tomb Mausoleum as the object,apply these non-destructive detection technologies,and test the feasibility of the single detection technology of internal defects in the trunk Characteristics;combined with the research on the detection methods of appearance such as tree height,crown area and shape,crown center height,etc.,a comprehensive assessment method of tree growth status is formed.Provide basic data for the joint protection of Yong Tomb trees and cultural relics,and provide a reference for the non-destructive testing and evaluation of the growth status of other ancient trees and urban big trees.The main research work and conclusions are as follows:1)The statistics and classification of Yong Tomb trees were carried out,and the measurement and calculation methods of tree height,crown area and shape,crown center height,etc.were studied.It was found that among the three main tree species of Pinus tabulaeformis Carr.,Pinus bungeana Zucc.,and Platycladus orientalis growing in Yong Tomb,Pinus bungeana Zucc.had a greater advantage in tree height,with a maximum height of 22 m;the surface defects of Platycladus orientalis were less than those of Pinus tabulaeformis Carr.,Pinus bungeana Zucc,and the growth conditions were better;In terms of tree diameter,the chest diameter of Platycladus orientalis is generally small,and the chest diameter of Pinus bungeana Zucc.is generally large,up to 95 cm.2)A stress wave critical wave velocity test study based on the rapid screening of internal defects in the tree trunk was carried out.It was found that among the three tree species growing in Yong Tomb,the critical wave velocity of Platycladus orientalis was the largest,the critical wave velocity of Pinus bungeana Zucc.was the second,and the critical wave velocity of Pinus tabulaeformis Carr.was the smallest,respectively 1620m/s,1394m/s and 1225m/s.3)The application research on stress wave tomography detection of internal defects in the trunk was carried out.It was found that the stress wave tomographic image can well show the shape of the defects inside the trunk,but it is difficult to distinguish between the cavity and the decay.Compared with the defect size results detected by the micro-drill resistance,the defect size displayed by the tomographic image is basically accurate.4)According to the detection results of the internal defects of the trunk,the surface defects of the trunk,and the growth of the branches and leaves of the tree,a comprehensive assessment of the growth status of the trees in Yong Tomb can be well achieved.