本文選題：米老排　切入點：人工林　出處：《中南林業(yè)科技大學》2017年碩士論文　論文類型：學位論文

【摘要】：米老排是我國亞熱帶鄉(xiāng)土闊葉樹種之一,具有較好的生態(tài)效益和經濟效益,在林業(yè)生產中作為人工林樹種有著較大的潛力。本文以廣東省云浮市同樂林場米老排人工林為研究對象,通過對樣地的調查、樹干解析、成本核算等方式,研究米老排樹種在該林場的生長規(guī)律、林分穩(wěn)定性和經濟效益,評價其推廣前景。主要研究結果如下:(1)米老排的樹高、胸徑和材積總生長量都是隨著年齡的增大而增大,8—16年是胸徑生長的旺盛時期,4-6年是樹高生長的第一個生長高峰。米老排與馬尾松生長特性較為相似,但從12a之后馬尾松在胸徑生長速度和材積生長速度上比米老排更快。陽坡對米老排林分生長更加有利,密度對單木生長的影響較小,林分密度與胸徑呈負相關,林分密度對蓄積的影響比較明顯,密度越大,林分蓄積量越大。通過6種模型對米老排人工林生長進行擬合,結果表明Weibull模型預測精度高、結構合理,是適宜郁南縣同樂林場米老排人工林的生長過程模型。(2)米老排各器官生物量由高到低順序:干枝根皮葉,米老排樹干生物量占林分生物量的比例較大,是能提供豐富木材的用材樹種。米老排的林分凈生產量都呈現樹干最高、樹葉最小的特征。米老排林分辛普森多樣性指數和香濃-威納指數為0,說明米老排純林生物多樣性較低,應適當提高生物多樣性,調整林分結構,使其有利于林木的生長,提高生態(tài)和經濟雙重效益。(3)米老排林分第34a主伐獲得的總收入為191166元/hm2,純收入為86950.58元/hm2;預估34年生規(guī)范經營的米老排人工林的銷售收入收入為345522.4元/hm2,主要的投入成本為每公頃169738.526元/hm2,純收入175783.874元/hm2。分析結果表明:米老排人工林盈虧臨界點價格為645.6元/m3,現實米老排人工林木材銷售價格遠大于645.6元/m3;木材價格的變化對米老排人工林經濟效益利潤、凈現值的影響最大,其次是出材量,最小是投資成本,因為未來木材價格下降的概率較小,所以該項目投資穩(wěn)定性較強。
[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.
【學位授予單位】：中南林業(yè)科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：S792.99
，

本文編號：1623225