Growth Characteristics And Benefit Evaluationby Of Mytilaria Laosensis Lecomte In The Tongle Forest Farm

Mytilaria laosensis Lecomte is One of the Subtropical Broadleaf Species in China,has good ecological benefits and economic benefits.It has great potential as a plantation tree in forestry production.This paper takes Mytilaria laosensis Lecomte plantation in Tongle forest farm as the research object,through the investigation of the sample plot,trunk analysis,cost accounting,etc.,Study on the growth rule,stand stability and economic benefit of Mytilaria laosensis Lecomte,and evaluate its promotion prospects.The main results are as follows:(1)The height,DBH and volume of Mytilaria laosensis Lecomte grow with the age,the vigorous growth of DBH is 8 years to 16years,the vigorous growth of tree height is 4 years to 6 years.The growth characteristics of Mytilaria laosensis Lecomte and Pinus massoniana are more similar,but after 12 years Pinus massoniana grows faster than Mytilaria laosensis Lecomte in growth rate of DBH and volume.The sunny slope is more favorable for stand growth,density has little effect on the growth of single wood,stand density is negatively correlated with DBH,the effect of stand density on the accumulation is obvious,the greater density,the greater stand volume.Six models were used to fit the growth of Mytilaria laosensis Lecomte plantation,the results show that the Weibull model has high prediction accuracy and reasonable structure,is suitable for the growth process model of Mytilaria laosensis Lecomte plantation in Tongle forest farm.(2)The biomass of each organ of Mytilaria laosensis Lecomte is from high to low order:trunk>branch>root>bark>leaf,the proportion of trunk biomass to stand biomass is larger,Mytilaria laosensis Lecomte is a timber tree species that can provide a wealth of timber.The net yield of Mytilaria laosensis Lecomte stand is the trunk highest and the leaf smallest.The Mytilaria laosensis Lecomte stand for the Simpson diversity index and Shannon-Wiener index is zero,show that the diversity of Mytilaria laosensis Lecomte pure forest is lower,the biodiversity should be improved and the stand structure should be adjusted,so that it is beneficial to the growth of trees and the double benefits of ecology and economy.(3)The total income of 34 years Mytilaria laosensis Lecomte forest felling is 191166 Yuan/hm2,net income is 86950.58 Yuan/hm2;the estimated sales revenue of 34 years of standardized management of Mytilaria laosensis Lecomte plantation is 345522.4 Yuan/hm2,the main input costs is 169738.526 Yuan/hm2 per hectare,net receipt is 175783.874 Yuan/hm2.The analytical results show that Mytilaria laosensis Lecomte plantation breakeven point price is 645.6 yuan/m3 while the actual selling price is much higher than 645.6 yuan/m3;the change in the price of timber has the greatest impact on the economic benefit and net present value of Mytilaria laosensis Lecomte plantation,followed by the amount of material,the minimum is the investment cost.Because the probability of future decline in timber prices is small,so the project investment stability is strong.