同乐林场米老排林分生长特性与效益评估的研究

发布时间：2018-03-17 04:36

  本文选题：米老排　切入点：人工林　出处：《中南林业科技大学》2017年硕士论文　论文类型：学位论文

【摘要】：米老排是我国亚热带乡土阔叶树种之一,具有较好的生态效益和经济效益,在林业生产中作为人工林树种有着较大的潜力。本文以广东省云浮市同乐林场米老排人工林为研究对象,通过对样地的调查、树干解析、成本核算等方式,研究米老排树种在该林场的生长规律、林分稳定性和经济效益,评价其推广前景。主要研究结果如下:(1)米老排的树高、胸径和材积总生长量都是随着年龄的增大而增大,8—16年是胸径生长的旺盛时期,4-6年是树高生长的第一个生长高峰。米老排与马尾松生长特性较为相似,但从12a之后马尾松在胸径生长速度和材积生长速度上比米老排更快。阳坡对米老排林分生长更加有利,密度对单木生长的影响较小,林分密度与胸径呈负相关,林分密度对蓄积的影响比较明显,密度越大,林分蓄积量越大。通过6种模型对米老排人工林生长进行拟合,结果表明Weibull模型预测精度高、结构合理,是适宜郁南县同乐林场米老排人工林的生长过程模型。(2)米老排各器官生物量由高到低顺序:干枝根皮叶,米老排树干生物量占林分生物量的比例较大,是能提供丰富木材的用材树种。米老排的林分净生产量都呈现树干最高、树叶最小的特征。米老排林分辛普森多样性指数和香浓-威纳指数为0,说明米老排纯林生物多样性较低,应适当提高生物多样性,调整林分结构,使其有利于林木的生长,提高生态和经济双重效益。(3)米老排林分第34a主伐获得的总收入为191166元/hm2,纯收入为86950.58元/hm2;预估34年生规范经营的米老排人工林的销售收入收入为345522.4元/hm2,主要的投入成本为每公顷169738.526元/hm2,纯收入175783.874元/hm2。分析结果表明:米老排人工林盈亏临界点价格为645.6元/m3,现实米老排人工林木材销售价格远大于645.6元/m3;木材价格的变化对米老排人工林经济效益利润、净现值的影响最大,其次是出材量,最小是投资成本,因为未来木材价格下降的概率较小,所以该项目投资稳定性较强。
[Abstract]:Rice row is one of the subtropical native broad-leaved trees in China, which has good ecological and economic benefits. There is a great potential as a plantation tree species in forestry production. This paper takes the rice old row plantations in Tongle Forest Farm, Yunfu City, Guangdong Province as the research object, through the investigation of sample plots, trunk analysis, cost accounting and so on. The growth law, stand stability and economic benefit of the tree species in the old row were studied, and its extension prospect was evaluated. The main results were as follows: 1) the tree height of the old row. The growth of DBH and volume increased with the increase of age. The growth period of DBH from 8 to 16 years was the first growth peak of height growth in 4-6 years. The growth characteristics of rice row and Pinus massoniana were similar to those of Pinus massoniana. But after 12 years, the growth rate of DBH and volume of Pinus massoniana was faster than that of the old row of rice. The sunny slope was more favorable to the growth of the stand, the density had little effect on the growth of single tree, and the stand density was negatively correlated with DBH. The effect of stand density on accumulation was obvious, and the higher the density, the larger the stand volume. The results showed that Weibull model had high prediction accuracy and reasonable structure. It is suitable for the growth process model of rice old row plantations in Tongle Forest Farm of Yunan County. 2) the biomass of each organ of rice row is in the order of high to low: dry branch, root, leaf, trunk of rice old row, and the proportion of biomass of tree trunk to stand biomass. It is a timber tree that can provide abundant wood. The net production of the stands in the old row of rice is the highest in the tree trunk. The minimum leaf characteristics. Simpson diversity index and Xiangnou-Weiner index were 0, which indicated that the biodiversity of pure rice row stands was low, so the biodiversity should be improved and the stand structure should be adjusted so as to benefit the growth of trees. Raising ecological and economic benefits. 3) the total revenue from the 34a main cutting of the Lao Pai stand is 191166 yuan / hm ~ (2), the net income is 86950.58 yuan / hm ~ (2); the estimated sales income of the rice row plantations is 345522.4 yuan / hm ~ (2), and the main input is the main input. The cost is 169738.526 yuan per hectare per hectare / hm ~ (2) and net income is 175783.874 yuan / hm ~ (2). The results show that the critical point of profit and loss of rice row plantation is 645.6 yuan / m ~ (3), and the sales price of rice row plantations is far greater than 645.6 yuan / m ~ (3). Economic profit of plantation, Net present value (NPV) is the most important factor, followed by timber output and investment cost. Because the probability of wood price decline in the future is small, the investment stability of the project is stronger.
【学位授予单位】：中南林业科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：S792.99
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本文编号：1623225