Study Of Nurture Management Of Middle-aged And Young Forest In Yaoxiang Farm

The study of YaoXiang Farm has 47 standard plots in forest tree species composition, crown density and average DBH, hectares, volume number/hectares on before and after thinning fassi, number of thinning intensity (%), accumulate thinning intensity (%) of statistical analysis,we discuss the intermediate cutting of the principle and the improvement measures, and obtain the biggest economic benefits and maximise forests, the society has laid a good foundation.The main results are as follows:(1).Operation area yield sharing forest district 29, bottom class in kindergarten 47, the tree seed is mainly the locust tree, the Japanese red pine, the Chinese pine, the hemp oak tree, the larch 5 kind of pure crop has 4 kinds, the locust tree pure crop distribution is broadest, the area approximately is 263.87 hm2, some 23 bottom classes in kindergarten, occupy the complete bottom class in kindergarten 48.94%; The Chinese pine pure crop distributes in 9 bottom classes in kindergarten, occupies the complete bottom class in kindergarten 19.15%; The Japanese red pine pure crop distributes in 7 bottom classes in kindergarten, occupies the complete bottom class in kindergarten 14.89%; The larch pure crop distributes in 1 bottom class in kindergarten, occupies the complete bottom class in kindergarten 2.13%. The mixed forest has 6 types, distributes in 6 bottom classes in kindergarten, occupies the complete bottom class in kindergarten respectively 2.13%.(2). Judeich by the artificial single-layer pure crop primarily, the tree seed by the locust tree primarily, between the individual bottom class in kindergarten has the part of hemp oak tree, the pine class. The locust tree is 15 years old, the pine class tree age about 23 years, the Judeich shade density is 0.8 generally, the partial bottom class in kindergarten shade density achieves 0.9, the volume-increment of whole woods condition is ordinary.(3). Each plantation tree planting age is different, the site conditions inconsistent and different small-class-based trees grow significantly, age 7-27 years in luffing differ, therefore, this study selected site conditions similar classes for mid-maturation forest thinning intensity and thinning period of investigation. Through the experiment ChiSong Lin Lin, and community respectively for thinning intensity below 5%, 5-10% and 10-15% of the comparative study, it is concluded that the public welfare forest licensing scope, ensure forest health growth premise can undertake 10-15% thinning intensity. On medicine township forest thinning different plantation age of robinia Lin trees of diameter changes after study to see: plantation age in 10-13 years wants to have proper thinning.(4). To various bottom classes in kindergarten volume-increment of whole woods investigation, as well as in the overall analysis appraisal's foundation, carries on the different way to various bottom classes in kindergarten forest the nurture management, the overall area of operation reaches 473.3 hm2, Judeich's shade density between 0.8-0.9, therefore mainly carries on the diaphanous nurture, the ecology thinning, the reshaping trim to Judeich, eliminates in the forest the reject and so on.(5). Around the nurture various bottom classes in kindergarten shade density drops, drops 0.1 has three bottom classes in kindergarten, accounts for the bottom class in kindergarten total 6.4%, drops 0.2 has 44 bottom classes in kindergarten, accounts for the bottom class in kindergarten total 93.6%. After the intermediate cuttings, the shade density basic is 0.7.(6). Around the nurture the Judeich average tree diameter at chest height has the obvious rise, from the 10.9cm rise to 11.25cm, the stand quality has the very big enhancement. An each hectare average number also drops from 1460 to 1311. The intermediate cuttings has adjusted the density, expanded retained the wooden nutrition space, improved in the forest the microclimate condition, was advantageous in improves Judeich's quality and the productive forces.This study based on analysis and statistical of the project of middle-aged and young forest tending in Yaoxiang farm, discuss the principles and the technical indicators about middle-aged and young forest tending and made some improvements, can be carried out in the future to provide some tending Young reference.