| 土壤腐殖物质特征及其对有机碳长时间尺度稳定性的指示：以陕西洛川黄土剖面为例 |
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| 引用本文： | 孙旭辉,李福春,师焕芝,代静玉,吴枫,金章东.土壤腐殖物质特征及其对有机碳长时间尺度稳定性的指示：以陕西洛川黄土剖面为例[J].地学前缘,2011,18(6):117-124. |
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| 作者姓名： | 孙旭辉 李福春 师焕芝 代静玉 吴枫 金章东 |
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| 作者单位： | 1. 南京农业大学资源与环境科学学院,江苏南京,210095
2. 中国科学院地球环境研究所,黄土与第四纪地质国家重点实验室,陕西西安710075 |
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| 基金项目： | 国家自然科学基金项目(40971138,40930738,40573057);江苏高校优势学科建设工程资助项目 |
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| 摘 要： | 在长时间尺度上研究土壤中腐殖物质的组成和腐殖化特征对于正确评价土壤有机质的稳定性具有重要意义。文中对洛川黄土/古土壤剖面S8以上的17个黄土和古土壤样品中的胡敏酸（HA）、富里酸（FA）和胡敏素（HM）进行定量研究，并对HA和FA的E465、E665值等进行了测定。结合该课题组对矿物组成、总有机碳（TOC）及其各组分含...
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| 关 键 词： | 胡敏酸 富里酸 胡敏素 腐殖化程度 粘土矿物 黄A/古土壤 |
Characteristics of humic substances in soil and its implication to long-term stability of organic carbon: A case of Luochuan loess profile |
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| Sun Xuhui,Li Fuchun,Shi Huanzhi,Dai Jingyu,Wu Feng,Jin Zhangdong.Characteristics of humic substances in soil and its implication to long-term stability of organic carbon: A case of Luochuan loess profile[J].Earth Science Frontiers,2011,18(6):117-124. |
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| Authors: | Sun Xuhui Li Fuchun Shi Huanzhi Dai Jingyu Wu Feng Jin Zhangdong |
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| Institution: | 1.College of Resources and Environmental Sciences,Nanjing Agricultural University,Nanjing 210095,China 2.SKLLQG,Institute of Earth Environment,Chinese Academy of Sciences,Xi’an 710075,China |
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| Abstract: | Understanding the compositions of humic substances(HS) and its humification in soil on a long-term scale are important to evaluate the stability of soil organic matter.In this study,humic acid(HA),fulvic acid(FA) and humin(HM) in 17 samples of loess and paleosol from above S8 of the Luochuan loess/paleosol profile were analyzed quantitatively.The values of E465 and E665 of both HA and FA were also measured.By combining the contents of HA,FA and HM with the results of mineral compositions and total organic carbon,the characteristics of HS in soil and its implication to long-term stability of organic carbon were focused.The results indicated the following four aspects.(1) The order of the contents of HS in most of paleosol samples is HM>HA>FA,whereas that in loess is FA>HM>HA,with higher HA and HM but lower FA in paleosol than in loess;along with the increase in burial time,HA,FA,and HM in paleosol and FA and HM in loess decrease gradually to different extent;finally HA and FA in both loess and paleosol will not decrease till older than 200 ka,whereas HM till older than 700 ka.(2) HA/FA ratios in most paleosol samples are larger than 1 and decrease gradually with increased burial time(with an exception of S6);HA/FA ratios in loess are lower than those in paleosol;E4/E6 ratios of FA in both loess and paleosol decrease with increased burial time,indicating an increased humification degree;meanwhile,C/H and O/C ratios suggest that the condensation and oxidation degrees of HA and FA in paleosol increase slightly with increased burial time.The results in(1) and(2) indicate that the evolution direction of HS in both paleosol and loess may be as FA→HA→HM(→kerogen).(3) There are good correlations of TOC with HA,HA+FA,and HA+FA+HM(r=0.89,0.94,and 0.96,respectively).(4) There are also good correlations of kaolinite content with HA,HA+FA,and HA+FA+HM(r=0.62,0.57,and 0.65,respectively),indicating that the stability of HS in both loess and paleosol might be relevant with kaolinite.These results shed further light on organic geochemistry of loess and paleosol and on long-term stability of organic carbon in soil. |
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| Keywords: | humic acid fulvic acid humin humification degree clays loess-paleosol |
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