本文選題：桉樹　切入點：連栽　出處：《廣西大學》2017年碩士論文

【摘要】：桉樹具有速生性、豐產性、耐貧瘠、干形較好等優(yōu)勢,木材大堅硬,抗腐能力強,廣泛可用于建筑、家具、火柴、碳材等,具有較高的使用價值和經濟價值。本研究采用空間序列代替時間(連栽)的采樣方法,擬通過對連栽經營桉樹人工林的生長規(guī)律、土壤有機碳儲量、土壤有機碳的物理化學組分、土壤有機碳波譜特征等方面的分析研究,結果表明:(1)桉樹連栽對土壤有機碳儲量的影響。0-20cm的有機碳含量是桉一代桉二代,兩者相差在2.56g·kg-1,20-100cm的各土層有機碳含量則是桉二代桉一代,兩者相差在0.15g·kg-1-0.76g·kg-1�？梢�,桉樹雖然有一定的固碳能力,但是由于桉樹輪伐期較短,枯株落葉未能及時分解轉換成土壤中的有機質,且桉二代清理林地多采用煉山方式,枯落物轉化成CO2進入大氣,因此,隨著桉樹代次的增加,土壤有機碳的含量相對減少。(2)桉樹連栽對土壤有機碳物理化學組分的影響。不同栽植代數(shù)桉樹人工林及杉木林土壤輕組及重組有機碳含量均隨著土層的加深呈逐漸減少的趨勢。土壤團聚體有機碳含量隨著土層的加深呈逐漸減少的趨勢。土壤活性有機碳、慢性有機碳、惰性有機碳含量的變化皆表現(xiàn)為隨著土層的加深而逐漸減少。(3)桉樹連栽對土壤有機碳波譜特征的影響。不同人工林土壤脂族碳/芳香碳的比值大小順序為杉木桉一代,杉木桉二代;烷基碳/烷氧碳比值的大小順序為桉二代杉木,桉一代=杉木;疏水碳/親水碳的比值的大小順序桉二代杉木,桉一代杉木。桉一代、桉二代和杉木林土壤4個分層的土壤紅外光譜非常相似。
[Abstract]:Eucalyptus has the advantages of fast growth, high yield, poor tolerance, good dry shape, and so on. The wood is hard and strong, and can be widely used in construction, furniture, matches, carbon materials, etc. In this study, the spatial sequence instead of time (continuous planting) sampling method was used to study the soil organic carbon storage through the growth law of continuous planting eucalyptus plantation. The physical and chemical components of soil organic carbon and the spectral characteristics of soil organic carbon were analyzed. The results showed that the effect of continuous planting of eucalyptus on soil organic carbon storage was 0.0-20cm, which was the second generation of eucalyptus. The content of organic carbon in each soil layer with the difference of 2.56 g 路kg ~ (-1) ~ 20 ~ 100 cm was the second generation of eucalyptus, and the difference was 0.15 g / kg ~ (-1). It can be seen that although eucalyptus has a certain carbon sequestration ability, the rooting period of eucalyptus is shorter than that of eucalyptus. Litter could not be decomposed into soil organic matter in time, and the second generation of Eucalyptus forest land was cleared by mountain chain, and the litter was transformed into CO2 to enter the atmosphere. Therefore, with the increase of eucalyptus generations, The effect of continuous planting of eucalyptus on the physical and chemical components of soil organic carbon. Soil light and recombination organic carbon contents of different planting generations of eucalyptus plantation and Chinese fir forest were increased with the deepening of soil layer. Soil aggregate organic carbon content decreases gradually with the deepening of soil layer. Chronic organic carbon, The change of inert organic carbon content showed that with the deepening of soil layer, the effect of continuous planting of eucalyptus on the soil organic carbon spectrum characteristics was decreased. The ratio of lipid carbon to aromatic carbon in different plantation soil was in the order of Chinese fir eucalyptus generation. The order of the ratio of alkyl carbon to alkyl oxygen carbon is eucalyptus second generation Chinese fir, eucalyptus generation = Chinese fir, the size order of hydrophobic carbon / hydrophilic carbon ratio is eucalyptus second generation Chinese fir, eucalyptus generation Cunninghamia lanceolata, eucalyptus generation, eucalyptus, The infrared spectra of the soils of the second generation of Eucalyptus and Chinese fir forest were very similar.
【學位授予單位】：廣西大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：S792.39;S714.2

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