本文選題：土壤有機(jī)碳 + 土壤無(wú)機(jī)碳�。� 參考：《陜西師范大學(xué)》2015年碩士論文

【摘要】：植被恢復(fù)與重建是控制水土流失和改善生態(tài)環(huán)境的重要措施,其固碳效益是衡量區(qū)域生態(tài)效應(yīng)的重要依據(jù)。本研究采用空間代替時(shí)間、野外調(diào)查與室內(nèi)分析相結(jié)合的方法,對(duì)黃土高原人工和天然植被恢復(fù)下的典型樣地進(jìn)行采樣和測(cè)定分析,探討了植被恢復(fù)重建進(jìn)程中土壤有機(jī)碳庫(kù)和無(wú)機(jī)碳庫(kù)動(dòng)態(tài)變化特征,評(píng)估植被恢復(fù)與土壤固碳效應(yīng)的演變關(guān)系,闡明影響土壤有機(jī)碳和無(wú)機(jī)碳固定的直接和間接因子,旨在為全面認(rèn)識(shí)和理解以及準(zhǔn)確評(píng)價(jià)黃土高原植被恢復(fù)的土壤固碳效應(yīng),為更好的闡明植被恢復(fù)與土壤碳庫(kù)間的演變關(guān)系提供科學(xué)依據(jù),同時(shí)為黃土高原植被恢復(fù)與重建工作提供科學(xué)參考。本研究主要結(jié)論如下：1、隨人工植被恢復(fù)年限的增加,刺槐林土壤固定有機(jī)碳(soil organic carbon, SOC)的效應(yīng)先減少后增加,表層遠(yuǎn)大于下層,且下層受植被影響不明顯。土壤無(wú)機(jī)碳(soil inorganic carbon, SIC)的固定效應(yīng)隨年限變化不明顯,在16.65～20.30kg·m-2波動(dòng)變化,但改變了淀積層的剖面分布狀況；表層SIC含量最低,隨土層深度而增加。0-100 cm土壤無(wú)機(jī)碳庫(kù)儲(chǔ)量是有機(jī)碳庫(kù)的4.5～7.4倍,表明土壤無(wú)機(jī)碳庫(kù)對(duì)總碳庫(kù)儲(chǔ)存能力的貢獻(xiàn)占絕大部分。2、隨天然植被恢復(fù)年限的增加,0-100 cm土層有機(jī)碳儲(chǔ)量總體變化趨勢(shì)是先減少后增加最后趨于穩(wěn)定,為5.93～8.95 kg·m-2,主要富集在0-20 cm；隨年限增加,0-100 cm土層SIC的截存能力總體呈略微下降趨勢(shì),且其下降主要發(fā)生在0-20 cm土層,20 cm以下土層變化不明顯。0-100 cm剖面無(wú)機(jī)碳庫(kù)貯存量是有機(jī)碳庫(kù)的3.0-4.6倍,表明土壤無(wú)機(jī)碳庫(kù)儲(chǔ)量在總碳庫(kù)中占大部分比例。3、通徑分析表明,人工植被恢復(fù)下土壤性狀與土壤有機(jī)碳相關(guān)性依次為根系生物量土壤pH土壤容重土壤含水量,其中土壤含水量和土壤pH值對(duì)SOC含量的影響主要是直接效應(yīng),根系生物量對(duì)SOC含量的影響主要為正向間接效應(yīng),土壤容重對(duì)SOC含量影響直接和間接效應(yīng)相當(dāng)。其中土壤pH值、土壤容重是SOC含量變化的主導(dǎo)因子,二者共同控制著SOC含量的形成和轉(zhuǎn)化。土壤性質(zhì)與SIC含量的相關(guān)性為：土壤砂粒土壤粘粒土壤含水量,其中土壤砂粒、粘粒是影響SIC含量形成和轉(zhuǎn)化的主要因子。表明短時(shí)間人工植被的恢復(fù)對(duì)SIC含量影響不顯著,其含量主要由土壤母質(zhì)決定。4、通徑分析結(jié)果表明,天然植被恢復(fù)過(guò)程中土壤性質(zhì)與SOC含量的相關(guān)性為根系生物量土壤容重土壤電導(dǎo)率土壤含水量,其中根系生物量、土壤含水量對(duì)SOC含量主要產(chǎn)生正向直接作用,土壤容重對(duì)SOC含量主要是負(fù)向直接作用,土壤電導(dǎo)率主要為負(fù)向間接作用。其中土壤容重、土壤含水量和根系生物量是影響SOC含量的主導(dǎo)因子,土壤電導(dǎo)率是形成SOC含量的限制因子；土壤性質(zhì)與SIC含量的相關(guān)性為：根系生物量土壤容重土壤含水量粉粒量。其中根系生物量、土壤容重和粉粒對(duì)SIC含量主要產(chǎn)生直接效應(yīng),土壤含水量對(duì)SIC含量主要為負(fù)向間接貢獻(xiàn)。其中根系生物量、土壤容重是決定SIC含量變化的主導(dǎo)因子,表明天然植被恢復(fù)下土壤性質(zhì)對(duì)SIC含量有一定影響。5、不同植被恢復(fù)模式下SIC固定效應(yīng)均高于SOC庫(kù),天然植被恢復(fù)下SOC固定速率(0.036 g·kg-1.a-1)高于人工植被(0.022 g·kg-1·a-1),恢復(fù)年限顯著影響著土壤固碳水平。植被恢復(fù)過(guò)程中SOC含量和SIC含量的形成和周轉(zhuǎn)受到不同土壤性質(zhì)的影響,不同土壤性質(zhì)之間存在一定相互關(guān)系也會(huì)作用于土壤碳庫(kù)。不同植被恢復(fù)下SOC庫(kù)與SIC庫(kù)間均呈負(fù)相關(guān)性,說(shuō)明二者之間可能存在一定的轉(zhuǎn)化關(guān)系,亟需繼續(xù)研究。
[Abstract]:The restoration and reconstruction of vegetation is an important measure to control soil erosion and improve the ecological environment. Its carbon sequestration benefit is an important basis for measuring the ecological effects of the region. This study uses space instead of time, field investigation and indoor analysis, to sample and determine the typical samples of artificial and natural vegetation restoration in the Loess Plateau. The dynamic change characteristics of soil organic carbon bank and inorganic carbon pool in the process of vegetation restoration and reconstruction are discussed, the evolution relationship between vegetation recovery and soil carbon sequestration is evaluated, and the direct and indirect factors affecting soil organic carbon and inorganic carbon fixation are clarified, aiming at the comprehensive understanding and understanding and the accurate evaluation of the soil restoration of the vegetation on the Loess Plateau. The effect of soil carbon sequestration provides a scientific basis for clarifying the relationship between vegetation restoration and the evolution of soil carbon pool, and providing scientific reference for the restoration and reconstruction of vegetation in the Loess Plateau. The main conclusions are as follows: 1, the effect of soil organic carbon (SOC) fixed on the soil soil of Robinia pseudoacacia with the increase of artificial vegetation restoration years The surface of soil inorganic carbon (soil inorganic carbon, SIC) is not obvious, and the change of soil inorganic carbon (soil inorganic) is not obvious with the period of time. It changes from 16.65 to 20.30kg to m-2, but changes the profile distribution of the accumulation layer; the surface SIC content is the lowest, and the.0-100 cm soil increases with the depth of the soil layer. The reserves of soil inorganic carbon pool are 4.5 to 7.4 times more than that of organic carbon pool. It shows that the contribution of soil inorganic carbon pool to the storage capacity of total carbon storage is most.2. With the increase of natural vegetation restoration years, the overall change trend of organic carbon reserves in 0-100 cm soil layer is first decreasing and then increasing finally to stable, which is 5.93 to 8.95 kg. M-2, mainly enriched in 0-20 cm; With the increase of years, the storage capacity of SIC in the 0-100 cm soil layer decreased slightly, and the decrease mainly occurred in the 0-20 cm soil layer, and the soil layer under 20 cm was not obvious. The storage of inorganic carbon storage in the.0-100 cm section was 3.0-4.6 times of the organic carbon pool, indicating that the reserves of soil inorganic carbon storage in the total carbon pool accounted for the majority of the proportion.3, path analysis showed that The correlation between soil properties and soil organic carbon in artificial vegetation restoration is in turn the soil water content of pH soil bulk density in root biomass. The influence of soil water content and soil pH value on SOC content is mainly direct effect. The effect of root biomass on SOC content is mainly indirect effect, and soil bulk density has direct influence on the content of SOC. The soil pH value and the soil bulk density are the leading factors of the changes in the content of SOC, and the two factors jointly control the formation and transformation of the content of SOC. The correlation between the soil properties and the content of SIC is: soil sand soil clay soil water content, and the soil sand grains and clay particles are the main factors affecting the formation and transformation of SIC content. The restoration of short time artificial vegetation has no significant influence on the content of SIC, the content of which is mainly determined by the soil parent material.4. The result of path analysis shows that the correlation of soil properties and SOC content in the process of natural vegetation restoration is the soil moisture content of soil bulk density soil electrical conductivity in root biomass, and the root biomass and soil water content are the main content of the SOC content. In order to produce direct direct action, soil bulk density is mainly negative to SOC content, and soil conductivity is mainly negative and indirect. Soil bulk density, soil water content and root biomass are the leading factors affecting the content of SOC. Soil conductivity is the limiting factor for the formation of SOC content, and the correlation between soil properties and SIC content is the key factor. The root biomass, the soil bulk density and the powder grain have a direct effect on the content of SIC, and the soil moisture content has a negative indirect contribution to the content of SIC. The root biomass and the soil bulk density are the leading factors to determine the changes in the content of SIC, indicating that the natural vegetation is restored to the soil. The properties of SIC have a certain effect on the content of.5, and the fixed effect of SIC is higher than that of the SOC reservoir under the different vegetation restoration patterns. The fixed rate of SOC (0.036 G. Kg-1.a-1) under the natural vegetation restoration is higher than that of the artificial vegetation (0.022 G. Kg-1. A-1). The restoration years significantly affect the soil carbon sequestration level. The formation and turnover of SOC content and SIC content during the vegetation restoration process are affected by the vegetation restoration. Under the influence of different soil properties, there is a certain relationship between the soil properties and the soil carbon pool. Under the different vegetation restoration, there is a negative correlation between the SOC library and the SIC library, which indicates that there may be a certain transformation relationship between the two, and it is urgent to continue the study.
【學(xué)位授予單位】：陜西師范大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：Q948;S153

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