SCIENTIA GEOGRAPHICA SINICA ›› 2017, Vol. 37 ›› Issue (2): 266-273.doi: 10.13249/j.cnki.sgs.2017.02.013

• Orginal Article • Previous Articles     Next Articles

Spatial Heterogeneity and Environmental Significance of Pedogenesis in Soils from Valley of the Upper Minjiang River

Xingyue Wen1(), Yanjuan Huang2, Chengmin Huang2   

  1. 1. College of Land and Resources, China West Normal University, Nanchong 637002, Sichuan, China
    2. Department of Environmental Science and Engineering, Sichuan University, Chengdu 610065, Sichuan, China
  • Received:2016-03-02 Revised:2016-07-25 Online:2017-02-25 Published:2017-02-25
  • Supported by:
    National Natural Science Foundation of China (41371225,41671220);Key Project in Natural Science from Education Department of Sichuan Province (13ZA0115), Project for Innovation Team of China West University (CXTD2016-4)

Abstract:

Investigation on the pedogenesis of soils from the upper reaches of the Minjiang River is necessary for ecological reconstruction and vegetation restoration in this region. The soils development from the valley of the upper Minjiang River and the Jiuding Mountain were investigated based on the physical and chemical properties such as grain size distribution, oxide of iron, organic matter, carbonate, pH, organic stable isotope, cation exchange capacity, and clay mineralogy. The well development and eluviation prevailed in the soils from the Sanjiang to the Yingxiou, demonstrated by the higher values of clay/silt, iron free degree, clay and organic mater contents and lower values of carbonate content, pH and organic δ13C, indicating an environmental property of warm-wet climatic conditions and prevailed trees. However, the soils from the Caopo to the Fengyi were characterized by the higher sand and carbonate contents, pH and organic δ13C, and lower values of iron free degree and organic mater content, showing an arid climate in where C4 vegetation prevail. The clay/silt and organic mater content increase, iepidocrocite arising and calcite lack occurred in the high altitude region of the Jiuding Mountain, indicating a wet climatic condition. While the soils under 2000 metre above sea level presented an arid climatic feature, as demonstrated by the lower values of clay/silt and contents of clay and organic mater, as well as the higher calcite content and pH.

Key words: pedogenesis, spatial heterogeneity, arid valley, the upper Minjiang River, the Jiuding Mountain

CLC Number: 

  • S151.1