Acta Geographica Sinica ›› 2008, Vol. 63 ›› Issue (7): 714-724.doi: 10.11821/xb200807005

Previous Articles     Next Articles

Effect of Oasis Hydrological Processes on Soil Salinization of Tikanlik Oasis in the Lower Tarim River

ZHOU Honghua1,2,3, CHEN Yaning1,2, LI Weihong1,2   

  1. 1. Xinjiang Institute of Ecology and Geography, CAS, Urumqi 830011, China;
    2. Key Laboratory of Oasis Ecology and Desert Environment, Xinjiang Institute of Ecology and Geography, CAS, Urumqi 830011, China;
    3. Graduate University of Chinese Academy of Sciences, Beijing 100039, China
  • Received:2008-02-19 Revised:2008-05-09 Online:2008-07-25 Published:2008-07-25
  • Supported by:

    The CAS action-plan for West Development, No. KZCX2-XB2-03; Knowledge Innovation Project of CAS, No.KZCX2-YW-127; National Natural Science Foundation of China, No.90502004; No.40671014

Abstract:

Based on the monitoring data of soil salt content, quality of surface water and groundwater in the lower reaches of the Tarim River, the effect of hydrological processes of surface water and groundwater on soil salinization was analyzed. The results showed that there was evident positive correlation between degree of mineralization of surface water and salt content in 0-50 cm soil, but the relationship between degree of mineralization of surface water and salt content in 50-100 cm soil was not evident. Soil salt content was closely related to groundwater depth. And the salt content of 0.50 cm soil decreased with the increase of groundwater depth, especially 0-20 cm soil. The soil salt content was higher and showed a T-shaped distribution pattern when the groundwater depth was lower, but the highly aggregated salt content presented a decreasing trend with the increase of soil depth. On the contrary, the changes of soil salt content showed a diamond-shaped distribution pattern and soil salt content at intermediate layer was higher, when the groundwater depth was higher. The results also showed that the turning point of both groundwater mineralization and soil salt content distribution was 6.0 m. So 6.0 m was the critical groundwater depth to accelerate salt aggregation and stop accumulating soil salt content.

Key words: oasis, groundwater depth, soil salinization, Tarim River