Journal of Ecology and Rural Environment ›› 2018, Vol. 34 ›› Issue (10): 890-896.doi: 10.11934/j.issn.1673-4831.2018.10.004

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Geochemical Characteristics and Ecological Interaction of Earth Elements in the Soil-Plant System in Northwest Guizhou Province

HONG Tao1,2, XIE Yun-qiu1,2, QIN Xing-ming1,2, KONG Xiang-sheng1,2, OU Meng-meng1, YU Qi-wen1,2   

  1. 1. Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 541004, China;
    2. Key Laboratory of Karst Ecosystem and Treatment of Rocky Desertification, Ministry of Natural Resources, Guilin 541004, China
  • Received:2017-11-10 Online:2018-10-25 Published:2018-10-25

Abstract:

Zonal and non-zonal vegetation and its related soil samples were collected in Northwest Guizhou Province for analyzing the geochemical characteristics of the elements in soil-Plant system. Results show that low N,P and K concentrations were found in natural soils in study area. Soil Ca and Mg concentrations varied spatially and most trace elements contents were higher than the background values of the country but lower than that of other parts of Guizhou Province. Co was enriched in soils and As had a high background value but not tainted value in the study area where soil was seriously polluted by Cd. Biological absorption coefficients (BAC) indicate that plants had different elements absorption capacity which was mainly controlled by their physiology. Besides, biological absorption coefficients of essential macronutrient had an order of magnitude larger than that of trace elements. Considering to different plants, Pinus massoniana, Rhus chinensis and Iris tectorum maxim had strong abilities to translocate Cd from the root to the epigeal part. Iris tectorum maxim could absorb Cd and As effectively which could be used as a superior plant in the Cd-As combined pollution sites. BAC varied greatly because of different bedrock. BAC level in carbonate area was higher than that in clastic rock area, and the difference was mainly controlled by pH and co-adsorption effect. Furthermore,significant correlation of BAC could be noticed between Co and Cd, and Cu and Zn. Soil P may restrain the adsorption of Cu and Pb by the plants.

Key words: Karst, soil, ecosystem, geochemistry

CLC Number: