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贵州普定喀斯特坡地土壤剖面有机碳及其同位素组成

田丽艳1,2,郎赟超1**,刘丛强1,丁虎1,赵志琦1,刘涛泽1   

  1. (1中国科学院地球化学研究所环境地球化学国家重点实验室, 贵阳 550002; 2中国科学院大学, 北京 100049)
  • 出版日期:2013-09-10 发布日期:2013-09-10

Distribution patterns of organic carbon and its isotope compositions in soil profiles on the slopes in Puding karst areas of Guizhou Province, Southwest China.

TIAN Li-yan1,2, LANG Yun-chao1**, LIU Cong-qiang1, DING Hu1, ZHAO Zhi-qi1, LIU Tao-ze1   

  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)
  • Online:2013-09-10 Published:2013-09-10

摘要:

选取贵州省中西部普定县城周边具有不同岩性(碎屑岩和碳酸盐岩)的2个坡地的土壤剖面为研究对象,采集了不同坡地位置的砂岩黄壤剖面和黄色石灰土剖面,分析了土壤pH值、C/N值、土壤有机碳(SOC)含量以及有机碳同位素组成,探讨了黄壤与石灰土δ13CSOC值组成差异和SOC含量沿剖面以及在不同坡地位置的分布特征。结果表明:砂岩黄壤和黄色石灰土的有机碳含量变化范围分别为3.1~79.7和8.2~73.3 g·kg-1;沿坡面顶端到底端,2种土壤类型SOC含量均呈现出坡脚>坡顶>坡腰;除砂岩黄壤坡顶剖面的个别层位外,2类土壤剖面SOC含量均随剖面深度的增加而降低;砂岩黄壤和石灰土剖面δ13CSOC值的变化范围分别为-25.4‰~-20.7‰和-23.2‰~-18.8‰;除黄色石灰土坡腰剖面外,其余土壤剖面的δ13CSOC值均表现为随剖面表层至20~40 cm升高,然后随深度增加而降低,最后趋于稳定的特征;2类坡地土壤SOC含量以及δ13CSOC值的变化反映了不同类型植被残体的输入以及在土壤中的降解累积特征,有助于了解坡地堆积侵蚀以及成土过程对SOC循环的影响。
 

关键词: 红掌, CO2施肥, 切花, 生长发育, 品质

Abstract: Soil samples were collected from two types of slope soil profiles with different lithology (clastic rock and carbonate rock) around the Puding County of Guizhou Province, and their pH values, C/N ratios, organic carbon (SOC) contents, and SOC isotope compositions were analyzed, aimed to approach the distribution patterns of SOC and δ13CSOC in the two types of the soil profiles at different slope positions. The results showed that the SOC contents in the profiles of sandstone yellow soil and limestone yellow soil ranged from 3.1-79.7 g·kg-1 and 8.2-73.3 g·kg-1, respectively. From the top to the bottom of the slopes, the SOC contents in the two soils showed the same distribution pattern, i.e., slope bottom > slope top > slope waist. Across each soil profile, the SOC content decreased as a function of soil depth, except that of the sandstone yellow soil profile on the slope top. The δ13CSOC values in the profiles of sandstone yellow soil and limestone yellow soil varied in the range of -25.4‰ to -20.7‰ and -23.2‰ to -18.8‰, respectively. Except for the limestone yellow soil profile on the slope waist, the δ13CSOC values in the other soil profiles increased firstly from the surface layer to the 20-40 cm depth, then decreased as a function of soil depth, and finally kept stable at the base of the soil profiles. The variations of the SOC contents and the δ13CSOC values as a function of soil depth could be due to the input of plant residue and its degradation and accumulation in soil. This study provided insights to the slope soil erosion and the effects of pedogenic process on the SOC circulation of slope soils.

Key words: growth and development, Anthurium andraeanum, quality., CO2 fertilization, cut flower