桉树连栽对土壤有机碳储存和波谱特征的潜在影响研究

发布时间：2018-03-26 16:12

本文选题：桉树　切入点：连栽　出处：《广西大学》2017年硕士论文

【摘要】：桉树具有速生性、丰产性、耐贫瘠、干形较好等优势,木材大坚硬,抗腐能力强,广泛可用于建筑、家具、火柴、碳材等,具有较高的使用价值和经济价值。本研究采用空间序列代替时间(连栽)的采样方法,拟通过对连栽经营桉树人工林的生长规律、土壤有机碳储量、土壤有机碳的物理化学组分、土壤有机碳波谱特征等方面的分析研究,结果表明:(1)桉树连栽对土壤有机碳储量的影响。0-20cm的有机碳含量是桉一代桉二代,两者相差在2.56g·kg-1,20-100cm的各土层有机碳含量则是桉二代桉一代,两者相差在0.15g·kg-1-0.76g·kg-1。可见,桉树虽然有一定的固碳能力,但是由于桉树轮伐期较短,枯株落叶未能及时分解转换成土壤中的有机质,且桉二代清理林地多采用炼山方式,枯落物转化成CO2进入大气,因此,随着桉树代次的增加,土壤有机碳的含量相对减少。(2)桉树连栽对土壤有机碳物理化学组分的影响。不同栽植代数桉树人工林及杉木林土壤轻组及重组有机碳含量均随着土层的加深呈逐渐减少的趋势。土壤团聚体有机碳含量随着土层的加深呈逐渐减少的趋势。土壤活性有机碳、慢性有机碳、惰性有机碳含量的变化皆表现为随着土层的加深而逐渐减少。(3)桉树连栽对土壤有机碳波谱特征的影响。不同人工林土壤脂族碳/芳香碳的比值大小顺序为杉木桉一代,杉木桉二代;烷基碳/烷氧碳比值的大小顺序为桉二代杉木,桉一代=杉木;疏水碳/亲水碳的比值的大小顺序桉二代杉木,桉一代杉木。桉一代、桉二代和杉木林土壤4个分层的土壤红外光谱非常相似。
[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.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：S792.39;S714.2

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