模拟增温对土壤有机碳矿化及腐殖质组成的影响
发布时间：2018-07-23 17:56
【摘要】：在全球变暖背景下,了解土壤有机碳矿化对温度变化的响应对于阐明土壤碳循环与全球气候变化的关系具有重要意义。本研究以吉林省6种主要类型农田土壤(暗棕壤、白浆土、风沙土、冲积土、草甸土和黑土)为对象,通过室内培养试验探讨了不同温度(10、30和50℃)对土壤有机碳矿化及腐殖质组成的影响。主要研究结果如下:1.CO2释放速率呈前期快速后期缓慢的趋势,CO2累积释放量随培养时间延长而增加。未添加玉米秸秆条件下,随培养温度增加,几种类型土壤CO2释放速率和累积释放量逐渐增加。添加玉米秸秆条件下,除冲积土和草甸土外,其余几种类型土壤CO2释放速率在培养前期(0~13 d)表现为30℃50℃10℃;13 d后则表现为50℃30℃10℃。与未添加玉米秸秆相比,添加玉米秸秆后CO2累积释放量较高。随培养温度增加,土壤有机碳矿化率增大。与未添加玉米秸秆相比,添加玉米秸秆后土壤有机碳矿化率较大。这表明,土壤固碳能力随温度增加而减弱。2.在未添加玉米秸秆条件下,风沙土、冲积土、草甸土和黑土的有机碳矿化温度敏感性系数(Q10值)在低温范围(10~30℃)低于高温范围(30~50℃),暗棕壤和白浆土则相反。在添加玉米秸秆条件下,几种类型土壤Q10值在低温范围(10~30℃)均高于高温范围(30~50℃)。3.随培养温度增加,几种类型土壤及腐殖质组分碳(腐殖质碳-HEC、胡敏酸碳-HAC、富里酸碳-FAC和胡敏素碳-HUC)含量通常呈降低趋势;水溶性有机碳(WSOC)含量在50℃培养条件下最高。未添加玉米秸秆条件下,胡敏酸碳与富里酸碳比值(HAC/FAC)随培养温度增加通常呈降低趋势;添加玉米秸秆条件下,温度对HAC/FAC比值影响结果不一致。与未添加玉米秸秆相比,添加玉米秸秆后土壤及腐殖质组分碳含量均较高,HAC/FAC比值在10和30℃条件下较高。上述结果说明,高温(50℃)有利于WSOC含量的积累,不利于土壤及腐殖质组分碳含量的积累。添加玉米秸秆能增加土壤及腐殖质组分碳含量。4.随培养温度增加,2~0.25mm粒级团聚体百分比和水稳性团聚体平均重量直径(MWDs)降低,不同粒级团聚体组分有机碳含量也随之降低。以上结果表明,高温对土壤团聚体和团聚体稳定性有消极影响,并且不利于土壤团聚体有机碳含量的积累。5.在不同湿度水平下,随培养温度增加,土壤及腐殖质组分碳(HAC、FAC和HUC)含量呈降低趋势,HAC/FAC比值增加,WSOC含量在50℃条件下最高。在不同温度水平下,随水分含量增加,土壤总有机碳(TOC)含量降低,HAC/FAC比值增加。以上结果表明,温度和水分含量的增加不利于TOC含量的积累,有利于HA的形成;温度增加不利于HAC、FAC和HUC含量的积累,高温(50℃)有利于WSOC含量的积累。6.随培养温度增加,HA的烷基C/烷氧C,脂族C/芳香C,疏水性C/亲水性C和烷氧C/芳香C比值均趋于降低;HU的脂族C/芳香C和烷氧C/芳香C比值也随之降低,而烷基C/烷氧C和疏水性C/亲水性C比值趋于增加。这些结果说明,温度的升高使得HA的烷基化、脂族化和疏水性程度降低且更易分解;HU的脂族化程度降低,烷基化和疏水性程度增强且更易分解。在不同湿度水平下,随培养温度增加,HA的脂族C/芳香C和烷氧C/芳香C比值趋于降低,而疏水C/亲水C比值趋于增加;HU的脂族C/芳香C和烷氧C/芳香C比值趋于降低,而烷基C/烷氧C和疏水C/亲水C比值趋于增加。这些结果说明,在不同湿度水平下,温度的升高使得HA和HU的脂族化程度降低且更易分解,疏水性程度增强。
[Abstract]:Under the background of global warming, it is of great significance to understand the response of soil organic carbon mineralization to the temperature change. This study is based on 6 main types of farmland in Jilin (dark brown soil, white pulp soil, aeolian soil, alluvial soil, meadow soil and black soil). The effects of different temperatures (10,30 and 50 C) on soil organic carbon mineralization and humus composition were investigated. The main results were as follows: the release rate of 1.CO2 showed a slow trend in the early stage, and the cumulative release of CO2 increased with the prolongation of culture time. With the increase of culture temperature, the release rate of several types of soil CO2 was increased without corn straw. In addition to the addition of corn straw, the CO2 release rate of the other types of soil, except alluvial soil and meadow soil, was 30 C 50 C 10 C in the pre culture period (0~13 d), and 13 d after 13 D. The cumulative release of CO2 was higher after adding corn straw than corn straw. The mineralization rate of soil organic carbon increased with the increase of degree of soil organic carbon. Compared with corn straw, the soil organic carbon mineralization rate was larger after adding corn straw. This showed that the soil carbon sequestration capacity decreased with the increase of temperature. The temperature sensitivity coefficient (Q10 value) of the organic carbon mineralization of.2. in the sandy soil, alluvial soil, meadow soil and black soil under the condition of no corn straw added. Under the low temperature range (10~30 C) below the high temperature range (30~50 C), the dark brown soil and the white pulp soil are the opposite. Under the condition of corn straw, the Q10 values of several types of soil at low temperature range (10~30 C) are higher than the high temperature range (30~50).3. with the increase of culture temperature, several types of soil and humus components carbon (humus carbon -HEC, Hu Min acid carbon -HAC, rich. The content of acid carbon -FAC and humin carbon -HUC) usually showed a decreasing trend; the content of water-soluble organic carbon (WSOC) was highest at 50 C. Under the condition of without corn straw, the ratio of Hu Min's carbon to fulvic acid carbon (HAC/FAC) usually decreased with the increase of culture temperature, and the effect of temperature on the HAC/FAC ratio under the condition of corn straw was added. The carbon content of soil and humus after adding corn straw was higher than that of corn straw, and the HAC/FAC ratio was higher at 10 and 30 degrees. The above results showed that high temperature (50) was beneficial to accumulation of WSOC content and was not conducive to the accumulation of carbon content in soil and humus components. Adding corn straw could increase soil and rot. The carbon content.4. of the colonies increased with the increase of culture temperature, the percentage of 2~0.25mm particle aggregates and the average weight diameter of water stable aggregates (MWDs) decreased, and the organic carbon content of different aggregate aggregates decreased. The above results showed that high temperature had negative effects on soil aggregate and aggregate stability and was not conducive to soil aggregates. The accumulation of organic carbon content.5. at different humidity levels, with the increase of culture temperature, the content of carbon (HAC, FAC and HUC) in soil and humus decreased, the ratio of HAC/FAC increased and the content of WSOC was the highest at 50. The content of total organic carbon (TOC) decreased with the increase of water content at different temperature levels, and the ratio of HAC/FAC increased. The results show that the increase of temperature and moisture content is not conducive to the accumulation of TOC content, which is beneficial to the formation of HA, and the increase of temperature is not conducive to the accumulation of HAC, FAC and HUC. The accumulation of WSOC content is beneficial to the accumulation of.6. with the increase of culture temperature, the alkyl C/ alkoxy C, the C/ aromatic C of the HA, the hydrophobicity and the alkoxy aromatic ratio. The ratio of aromatic C to C/ aromatic C and alkoxy C/ in HU decreased, while the ratio of the alkyl C/ alkoxy C and hydrophobicity C/ to the hydrophobicity C increased. These results indicate that the increase in temperature makes the alkylation, lipoization and hydrophobicity of HA lower and more easily decomposed; HU lipoization degree decreases, alkylation and hydrophobicity are enhanced and the degree of alkylation and hydrophobicity are increased. At different humidity levels, with the increase of temperature, the aromatic C ratio of C/ aromatic C and alkoxy C/ in HA tends to decrease, while the hydrophobic C/ hydrophilic C ratio tends to increase, and the ratio of HU's C/ aromatic C and alkoxane C/ aromatic C tends to decrease, and the ratio of alkyl alkoxy oxygen and hydrophobically hydrophobic C tends to increase. These results show that the ratio of the alkyl alkoxy oxygen and the hydrophobicity of the hydrophobic C/ tends to increase. These results show that the ratio of the alkyl alkoxy oxygen and the hydrophobicity of the hydrophobic C tends to increase. These results show that the ratio of the alkyl alkoxy oxygen and the hydrophobicity of the hydrophobic C/ tends to increase. At the temperature level, the degree of aliphatic reaction of HA and HU decreases and is more easily decomposed and the hydrophobicity is enhanced.
【学位授予单位】：吉林农业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：S153.6
[Abstract]:Under the background of global warming, it is of great significance to understand the response of soil organic carbon mineralization to the temperature change. This study is based on 6 main types of farmland in Jilin (dark brown soil, white pulp soil, aeolian soil, alluvial soil, meadow soil and black soil). The effects of different temperatures (10,30 and 50 C) on soil organic carbon mineralization and humus composition were investigated. The main results were as follows: the release rate of 1.CO2 showed a slow trend in the early stage, and the cumulative release of CO2 increased with the prolongation of culture time. With the increase of culture temperature, the release rate of several types of soil CO2 was increased without corn straw. In addition to the addition of corn straw, the CO2 release rate of the other types of soil, except alluvial soil and meadow soil, was 30 C 50 C 10 C in the pre culture period (0~13 d), and 13 d after 13 D. The cumulative release of CO2 was higher after adding corn straw than corn straw. The mineralization rate of soil organic carbon increased with the increase of degree of soil organic carbon. Compared with corn straw, the soil organic carbon mineralization rate was larger after adding corn straw. This showed that the soil carbon sequestration capacity decreased with the increase of temperature. The temperature sensitivity coefficient (Q10 value) of the organic carbon mineralization of.2. in the sandy soil, alluvial soil, meadow soil and black soil under the condition of no corn straw added. Under the low temperature range (10~30 C) below the high temperature range (30~50 C), the dark brown soil and the white pulp soil are the opposite. Under the condition of corn straw, the Q10 values of several types of soil at low temperature range (10~30 C) are higher than the high temperature range (30~50).3. with the increase of culture temperature, several types of soil and humus components carbon (humus carbon -HEC, Hu Min acid carbon -HAC, rich. The content of acid carbon -FAC and humin carbon -HUC) usually showed a decreasing trend; the content of water-soluble organic carbon (WSOC) was highest at 50 C. Under the condition of without corn straw, the ratio of Hu Min's carbon to fulvic acid carbon (HAC/FAC) usually decreased with the increase of culture temperature, and the effect of temperature on the HAC/FAC ratio under the condition of corn straw was added. The carbon content of soil and humus after adding corn straw was higher than that of corn straw, and the HAC/FAC ratio was higher at 10 and 30 degrees. The above results showed that high temperature (50) was beneficial to accumulation of WSOC content and was not conducive to the accumulation of carbon content in soil and humus components. Adding corn straw could increase soil and rot. The carbon content.4. of the colonies increased with the increase of culture temperature, the percentage of 2~0.25mm particle aggregates and the average weight diameter of water stable aggregates (MWDs) decreased, and the organic carbon content of different aggregate aggregates decreased. The above results showed that high temperature had negative effects on soil aggregate and aggregate stability and was not conducive to soil aggregates. The accumulation of organic carbon content.5. at different humidity levels, with the increase of culture temperature, the content of carbon (HAC, FAC and HUC) in soil and humus decreased, the ratio of HAC/FAC increased and the content of WSOC was the highest at 50. The content of total organic carbon (TOC) decreased with the increase of water content at different temperature levels, and the ratio of HAC/FAC increased. The results show that the increase of temperature and moisture content is not conducive to the accumulation of TOC content, which is beneficial to the formation of HA, and the increase of temperature is not conducive to the accumulation of HAC, FAC and HUC. The accumulation of WSOC content is beneficial to the accumulation of.6. with the increase of culture temperature, the alkyl C/ alkoxy C, the C/ aromatic C of the HA, the hydrophobicity and the alkoxy aromatic ratio. The ratio of aromatic C to C/ aromatic C and alkoxy C/ in HU decreased, while the ratio of the alkyl C/ alkoxy C and hydrophobicity C/ to the hydrophobicity C increased. These results indicate that the increase in temperature makes the alkylation, lipoization and hydrophobicity of HA lower and more easily decomposed; HU lipoization degree decreases, alkylation and hydrophobicity are enhanced and the degree of alkylation and hydrophobicity are increased. At different humidity levels, with the increase of temperature, the aromatic C ratio of C/ aromatic C and alkoxy C/ in HA tends to decrease, while the hydrophobic C/ hydrophilic C ratio tends to increase, and the ratio of HU's C/ aromatic C and alkoxane C/ aromatic C tends to decrease, and the ratio of alkyl alkoxy oxygen and hydrophobically hydrophobic C tends to increase. These results show that the ratio of the alkyl alkoxy oxygen and the hydrophobicity of the hydrophobic C/ tends to increase. These results show that the ratio of the alkyl alkoxy oxygen and the hydrophobicity of the hydrophobic C tends to increase. These results show that the ratio of the alkyl alkoxy oxygen and the hydrophobicity of the hydrophobic C/ tends to increase. At the temperature level, the degree of aliphatic reaction of HA and HU decreases and is more easily decomposed and the hydrophobicity is enhanced.
【学位授予单位】：吉林农业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：S153.6
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