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Chinese Journal of Applied Ecology ›› 2017, Vol. 28 ›› Issue (9): 2778-2786.doi: 10.13287/j.1001-9332.201709.016

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Temporal and spatial dynamics of soil nitrogen, phosphorus, potassium, organic matter and pH in the water level fluctuation zone of canyon landform area of the Three Gorges Reservoir, China.

JIAN Zun-ji1, PEI Shun-xiang2, GUO Quan-shui1*, QIN Ai-li1, MA Fan-qiang1, ZHAO Yu-juan1, XIAO Wen-fa1, KANG Yi3   

  1. 1Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry/Key Laboratory of Forest Ecology and Environment of State Forestry Administration, Beijing 100091, China;
    2Experimental Center of Forestry in North China, Chinese Academy of Forestry, Beijing 102300, China;
    3Saihanba Mechanized Forest Farm of Hebe, Weichang 068450, Hebei, China.
  • Received:2016-12-20 Online:2017-09-18 Published:2017-09-18
  • Contact: * E-mail: guoqs@caf.ac.cn
  • Supported by:

    This work was supported by the National Science and Technology Pillar Program during the Twelfth Five-year Plan Period (2015BAD07B040301).

Abstract: Based on the long-term monitoring data of soil chemical properties before never experiencing water level fluctuation (2008) and after experiencing 1 time (2009), 4 times (2012), 7 times (2015) of water level fluctuation in the water level fluctuation zone with the altitude of 155-172 m, located at the Wushan and Zigui section of the Three Gorges Reservoir (TGR), the temporal and spatial dynamics of soil nitrogen (N), phosphorus (P), potassium (K), organic matter (OM) and pH value were studied and their nutrient status were evaluated. The contents of soil total nitrogen (TN), available nitrogen (AN), available potassium (AK) and OM gradually decreased with the increasing times of experiencing water level fluctuation, while the contents of total phosphorus (TP), total potassium (TK) and available phosphorus (AP), and pH value exhibited the opposite trend. The contents of TN, TK and AP in different soil layers displayed as Wushan > Zigui before never experiencing water level fluctuation and after experiencing 1 time of water level fluctuation. However, after experiencing 4 times and 7 times of water level fluctuation, they changed as Zigui > Wushan. Differences of soil chemical indicators in different soil layers gradually decreased with the increasing times of experiencing water level fluctuation. Compared with the nutrient classification standard of the national second soil census, the contents of TP and AP were extremely high grade in Zigui plot and the content of AP was high grade in Wushan plot after experiencing 7 times of water level fluctuation, and other soil indicators were in the middle or below grade. The hydrolo-gical regime characteristics of the TGR and the interference of human activities, as well as the diffe-rences of soil chemical indicators in nature were the major driving factors that caused the temporal and spatial dynamics of soil N, P, K, OM and pH in the water level fluctuation zone of canyon landform area of the TGR.