Characteristics and distributions of humic acids in two soil profiles of the southwest China Karst area

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• 作者：Liangang Ma ; Baohua Xiao ; Xinyue Di ; Weilin Huang ; Shijie Wang
• 关键词：Soil ; Soil organic matter ; Humic acid ; Characteristics ; Distribution ; Southwest China Karst area
• 刊名：Chinese Journal of Geochemistry
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：35
• 期：1
• 页码：85-94
• 全文大小：456 KB
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• 作者单位：Liangang Ma (1) (2)
  Baohua Xiao (1)
  Xinyue Di (1) (2)
  Weilin Huang (3)
  Shijie Wang (1)
  
  1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, China
  2. University of Chinese Academy of Sciences, Beijing, 100049, China
  3. Department of Environmental Sciences, Rutgers University, New Brunswick, NJ, 08901, USA
  
• 刊物主题：Geochemistry;
• 出版者：SP Science Press
• ISSN：1993-0364

文摘

Characteristics and distributions of humic acid (HA) and soil organic matter (SOM) in a yellow soil profile and a limestone soil profile of the southwest China Karst area were systematically investigated to reveal their evolutions in different soils of the study area. The results showed that characteristics and distribution of SOM along the two soil profiles were notably different. Total organic carbon (TOC) contents of soil samples decreased just slightly along the limestone soil profile but sharply along the yellow soil profile. TOCs of the limestone soils were significantly higher than those of the corresponding yellow soils, and C/N ratios of SOMs showed a similar variation trend to that of TOCs, indicating that SOM can be better conserved in the limestone soil than in the yellow soil. The soil humic acids were exhaustively extracted and further fractionated according to their apparent molecular weights using ultrafiltration techniques to explore underlying conservation mechanisms. The result showed that C/N ratios of HAs from different limestone soil layers were relatively stable and that large molecular HA fractions predominated the bulk HA of the top soil, indicating that HA in the limestone profile was protected while bio and chemical degradations were retarded. Combined with organic elements contents and mineral contents of two soils, we concluded that high calcium contents in limestone soils may play a key role in SOM conservation by forming complexation compounds with HAs or/and enclosing SOMs with hypergene CaCO₃ precipitation. Keywords Soil Soil organic matter Humic acid Characteristics Distribution Southwest China Karst area