JOURNAL OF NATURAL RESOURCES ›› 2016, Vol. 31 ›› Issue (5): 845-854.doi: 10.11849/zrzyxb.20150629

• Resource Evaluation • Previous Articles     Next Articles

Effects of Disturbance Intensity on Spatio-temporal Differentiation of Soil Particle Size in Reclamation Areas of Tidal Flat

ZHANG Meng1, PU Li-jie1, 2, WANG Xiao-han1, WANG Qi-qi1, YU Xue1   

  1. 1. School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210023, China;
    2. The Key Laboratory of the Coastal Zone Exploitation and Protection, Ministry of Land and Resources, Nanjing 210023, China
  • Received:2015-06-04 Revised:2015-09-02 Online:2016-05-20 Published:2016-05-19
  • Supported by:
    National Natural Science Foundation of China, No.41230751

Abstract: Tidal flat is one of the important ecotones and ecosystems between land and sea, but tidal flat reclamation has been an important way to release the increasing pressure of land-use due to the economic development in coastal regions. We analyzed the spatio-temporal differentiation of particle size distribution (PSD) on tidal flat with different years of reclamation and different intensities of disturbance, and compared the effects from natural succession and human activities on the process of environment change in the reclaimed zones. The results demonstrated: 1) During 60 years of reclamation, with the growth of reclamation period the content of sand decreased while those of silt and clay increased under all levels disturbance, and the decreasing rate of sand could reach 0.72% per year after desalination. 2) With no disturbance, the soil PSD could reflect the physical process of tidal flat being reclaimed and separated from the sea water, while under the intense natural and artificial disturbances it would reflect the integrated effects of both factors. 3) Cultivated methods, time and soil erosion would all induced significant spatio-temporal differentiation of PSD. 4) The spatio-temporal differentiation of PSD in reclaimed zones could generally demonstrate the environmental characteristics of tidal plat, and had significance in developing land resources in reclaimed tidal flat. During the long-time reclamation of tidal flat, the key affect factors were different in different regions at different stages, which lead to many unreasonable phenomena of land use pattern and resources allocation, and caused dramatic changes and fluctuations in soil environment. The correlation between natural resources and human activities should be carefully assessed.

Key words: coastal region of Jiangsu Province, disturbance intensity, particle size distribution, tidal flat reclamation

CLC Number: 

  • S152.3