Earth Science Frontiers ›› 2019, Vol. 26 ›› Issue (6): 159-191.DOI: 10.13745/j.esf.sf.2019.11.28

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Epigenetic geochemical dynamics and driving mechanisms of distribution patterns of chemical elements in soil, Southwest China

CHENG Hangxin,PENG Min,ZHAO Chuandong,HAN Wei,WANG Huiyan,WANG Qiaolin,YANG Fan,ZHANG Fugui,WANG Chengwen,LIU Fei,ZHOU Yalong,TANG Shiqi,LI Kuo,YANG Ke,YANG Zheng,CHENG Xiaomeng,CHEN Ziwan,ZHANG Hua,MO Chunhu
  

  1. 1. Institute of Geophysical & Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China
    2. Research Center of Geochemical Survey and Assessment on Land Quality, China Geological Survey, Langfang 065000, China
    3. Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earths Critical Zone, China Geological Survey, Langfang 065000, China
    4. Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earths Critical Zone, Chinese Academy of Geological Sciences, Langfang 065000, China
    5. School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China
    6. Yunnan Institute of Geological Survey, Kunming 650216, China
    7. Sichuan Geological Survey, Chengdu 610081, China
    8. Guizhou Geological Survey, Guiyang 550081, China
  • Received:2019-11-20 Revised:2019-11-25 Online:2019-11-30 Published:2019-11-30

Abstract:

 The surface layer of the Earth is a complex system made of interacting and communicating components such as mountains, rivers, forests, farmlands, lakes, grasses, etc. The interaction and mutual feedback of chemical elements in Earths surface layer can drive changes in their distribution patterns. In this paper, we studied the driving mechanism and process of interaction of the distribution patterns of macroelements, probiotics, halogens, and heavy metals in soils in Southwest China based on a systematic land quality geochemical survey at scale 1∶250000. The results showed that the parent material determines the natural state of chemical elements in land resources; the epigenetic geochemical dynamics process reshapes the distribution patterns of chemical elements in surface soil; biogeochemical processes drive the evolution trends of land quality; and strong human activities, such as mining, disrupts the natural evolution of elemental distribution patterns. By establishing an epigenetic geochemical dynamics theory, one can construction a knowledge system for the Earths surface layer and promote technological innovation in comprehensive geochemical investigation of land resources.

Key words: epigenetic geochemical dynamics, driving mechanisms, distribution pattern of elements in soils, Southwest China

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