本文選題：土壤有機碳 + 有機碳組分��； 參考：《東北林業(yè)大學》2015年碩士論文

【摘要】：本研究在張廣才嶺西部典型低山丘陵次生林區(qū),按坡位、坡向差異對等設置36塊樣地,采集lm剖面深度范圍內(nèi)不同發(fā)生層土樣。分析土壤有機碳及其在各組分(團聚體密度/粒徑組分)中分配,探討了地形因子(坡位、坡向、坡度)對土壤有機碳含量、有機碳密度的影響和土壤有機碳與物理保護因子(粘粒、團聚體)的關(guān)系,揭示土壤有機碳的物理保護及穩(wěn)定機制,并借助逐步回歸分析量化各因子對土壤有機碳密度變異影響的相對大小。結(jié)果表明：本區(qū)土壤1m剖面有機碳密度范圍為8.9～31.3kg/m2,具有較大的空間變異性,土壤有機碳的表聚特征明顯,平均而言A層集中了全剖面總有機碳的55.2%。坡位和坡向顯著影響本區(qū)土壤有機碳的分布：下坡A層有機碳密度是上坡的1.83倍,其1m剖面有機碳密度是上坡的1.67倍：陰坡A層有機碳密度是陽坡的1.37倍,其lm剖面有機碳密度是陽坡的1.17倍。不過,在所調(diào)查的范圍內(nèi)坡度對上、下坡土壤有機碳含量和密度均無顯著影響。本區(qū)土壤有機碳與粘粒、團聚體的相關(guān)格局較復雜,但排除坡位和坡積埋藏層等因子影響后,土壤有機碳含量、有機碳密度與粘粒、團聚體均不相關(guān),因此粘粒保護和團聚體保護并非本區(qū)土壤有機碳積累的控制因子。通過對土壤有機碳在各組分(團聚體密度／粒徑組分)中分配進一步分析,再一次證明土壤本身的物理保護(粘粉粒保護、團聚體保護、總物理保護)作用不是本區(qū)土壤總有機碳積累(差異)的控制因素。逐步回歸顯示,坡位是本區(qū)土壤有機碳數(shù)量分異的主控因子,可獨立解釋A層有機碳密度空間變異的57.5%、lm剖面有機碳空間變異的63.2%；粘粒和團聚體作為公認的土壤有機碳物理保護因子,卻因貢獻微小而在逐步回歸過程中被剔除。本研究結(jié)果為土壤有機碳物理保護及穩(wěn)定機制的研究提供了科學依據(jù),同時為區(qū)域森林土壤碳儲量準確估算和碳匯林立地選擇提供參考。
[Abstract]:In this study, 36 sample plots were set up according to slope position and slope direction difference in typical low hill secondary forest area in the west of Zhangguangcailing. Soil samples of different layers were collected in depth range of LM profile. Soil organic carbon (SOC) and its distribution in each component (aggregate density / particle size fraction) were analyzed, and the effects of topographic factors (slope position, slope direction, slope) on soil organic carbon content were discussed. The effects of organic carbon density and the relationship between soil organic carbon and physical protection factors (clay, aggregates) reveal the physical protection and stabilization mechanism of soil organic carbon. The effects of various factors on soil organic carbon density variability were quantified by stepwise regression analysis. The results showed that the density range of organic carbon in soil 1m profile was 8.9 ~ 31.3 kg / m ~ (-2), which had great spatial variability, and the apparent accumulation of soil organic carbon was obvious. On average, A layer concentrated 55.2% of the total organic carbon in the whole section. The distribution of soil organic carbon was significantly affected by slope position and direction: the organic carbon density of A layer was 1.83 times higher than that of upper slope, the organic carbon density of 1 m profile was 1.67 times higher than that of upper slope, and the organic carbon density of A layer in shady slope was 1.37 times of that of sunny slope. The organic carbon density of Lm profile is 1.17 times of that of sunny slope. However, the soil organic carbon content and density were not significantly affected by the slope. The correlation pattern of soil organic carbon, clay and aggregate is more complex, but the soil organic carbon content and organic carbon density are not related to clay and aggregate after the factors such as slope position and slope buried layer are excluded. Therefore, clay protection and aggregate protection are not the controlling factors of soil organic carbon accumulation in this area. Through the further analysis of the distribution of soil organic carbon in each component (aggregate density / particle size component), it is proved once again that the physical protection of soil (clay particle protection, aggregate protection), Total physical protection is not the controlling factor of soil total organic carbon accumulation (difference). The stepwise regression analysis showed that the slope position was the main factor of soil organic carbon quantity differentiation in this area, which could independently explain the spatial variation of organic carbon in the 57.5lm profile of layer A, which was 63.2% of the spatial variation of organic carbon. Clay and aggregates are recognized as physical protection factors of soil organic carbon, but they are eliminated in the process of stepwise regression because of their small contribution. The results provide a scientific basis for the study of the physical protection and stabilization mechanism of soil organic carbon, and provide a reference for the accurate estimation of soil carbon storage and the selection of carbon sequestration sites.
【學位授予單位】：東北林業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：S153.6

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