JOURNAL OF NATURAL RESOURCES ›› 2018, Vol. 33 ›› Issue (5): 867-878.doi: 10.11849/zrzyxb.20170463

• Resource Evaluation • Previous Articles     Next Articles

Study on the Spatial Synergistic Effect of Copper and Zinc in Tea Garden Soil Based on Copula Function

DONG Li-kuan1, FANG Bin1,2,3, WANG Chen-ge1   

  1. 1. a. Research Center of New Urbanization and Land Problem, b. College of Geography, Nanjing Normal University, Nanjing 210023, China;
    2. Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China;
    3. Jiangsu Key Laboratory for Material Cycle and Pollution Control, Nanjing 210023, China
  • Received:2017-05-16 Revised:2017-09-25 Online:2018-05-20 Published:2018-05-20
  • Supported by:
    National Natural Science Foundation of China, No. 41271189 and 41671174; The Preponderant Subject Construction Project of Universities in Jiangsu, No. 164320H101.

Abstract: It is very important to reveal the spatial synergistic effects of Cu and Zn in tea garden soil in effectively preventing and controlling soil Cu and Zn pollution and ensuring the quality of tea. Taking the typical tea plantations in Jiangsu and Zhejiang provinces as the study areas, this paper simulated the synergistic relationship between Cu and Zn content in the soil with Copula function, estimated the spatial regionalized variables of Cu and Zn in soil with Kriging/IDW interpolation method, and analyzed the spatial synergistic effects with Standard Deviation Ellipse Model. The results showed that: 1) The frequency histogram of the soil Cu and Zn content in the study area showed a “J” type distribution, which indicated that the upper tail is correlated while the lower tail is asymptotically independent; the upper tail correlation coefficient, the Kendall rank correlation coefficient, and the Spearman rank correlation coefficient between the soil Cu and Zn content were 0.345 4, 0.273 5, and 0.396 0, respectively; there is a positive correlation between the Cu and Zn content in soil, so it is recommended to strengthen the soil Cu and Zn content monitoring and improve early warning to avoid combined pollution. 2) As a whole, the correlation between soil Cu and Zn content was higher, but in some local areas it was lower due to the different dominant factors, for example, the soil Cu content in the west of Longjing was mainly affected by the thickness of tillage layer, while the soil Zn content showed a significant negative correlation with soil Se content at the 1% level, and their correlation coefficient was -0.288. Therefore, it could be considered to deal with the pollution of soil Cu and Zn together in the global areas and combine with the actual situation when dealing with the pollution of soil Cu and Zn in the local areas. 3) Copula function, combined with Kriging/IDW estimation and Standard Deviation Ellipse Model, can reflect the synergetic relationship between the content of soil Cu and Zn more truly and effectively and provide reference basis for the determination of Cu and Zn.

Key words: Copula function, soil Cu and Zn, spatial effect, Standard Deviation Ellipse Model, synergistic relationship

CLC Number: 

  • S153.6