RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2015, Vol. 24 >> Issue (09): 1545-1551.doi: 10.11870/cjlyzyyhj201509015

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Soil salinity fluctuations on enclosed tideland of chong-ming dong-tan wetland

ZHOU Jian-hong1,2, WANG Jiang-tao1,2, OU Qiang1,2, ZHONG Qi-cheng3, WANG Kai-yun1,2, JIANG Nan1,2, LI Yan1,2   

  1. 1. School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China;
    2. Key Laboratory of Urban Ecology and Restoration, Shanghai 200241, China;
    3. Research Center for Saline-alkali Water Fisheries Technology, East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200901, China
  • Received:2014-11-19 Revised:2015-03-19 Online:2015-09-20
  • Contact: 王开运,E-mail:kywang@re.ecnu.edu.cn E-mail:kywang@re.ecnu.edu.cn

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Abstract: We investigated the fluctuation of soil salinity in an enclosed tideland located in the east of Chongming Island. The soil solution electrical conductivity has been monitored at the depth of 10 cm and 30 cm below the ground for 5 years (from 2009 to 2013). The results are as follow: 1) annual fluctuation of soil salinity showed that there was a large yearly fluctuation of soil salinity. The annual average salinity at the 10 cm depth decreased by 8.31% each year during the last 5 years. At the 30 cm depth, the annual average salinity decreased by 6.06% each year during the first 4 years whereas the annual average salinity has significantly increased by 16.34% in the last year. The soil salinity at the 10 cm depth was significantly lower than the soil salinity at the 30 cm depth and the difference between them has increased with years. 2) The seasonal fluctuation showed that there was a significant difference among seasons every year. In general, the soil salinity tended to increase in spring, summer and autumn, then decrease in winter. This tendency resulted in the peak of soil salinity in autumn and the bottom of soil salinity in winter. Especially, the soil salinity at the 30 cm depth rose to the maximum among those five years in the autumn of 2013. Furthermore, the soil salinity in spring and summer at the 10 cm depth has decreased year by year while only the soil salinity in spring at the 30 cm depth has declined in the same patterns. 3) The daily fluctuation showed that the soil salinity at 10 cm depth has changed more intensively than the soil salinity at the 30 cm depth. The soil salinity at 30 cm depth appeared a time lag of daily minimum and maximum compared with the soil salinity at 10 cm depth. In conclusion, the topsoil salinity of our monitoring area tended to decrease to some extent every year after it had been diked. However, the phenomenon of severe salt accumulation could occur in autumn by the influence of seasonal climate. It implied that the salinity of the water table could still be high and it had better to take some measures in autumn to prevent the salt in the lower soil layer moving up.

Key words: Chong-ming Dong-tan, reclamation area, soil solution electrical conductivity, long-term monitoring

CLC Number: 

  • S156.4+1
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