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Chinese Agricultural Science Bulletin ›› 2019, Vol. 35 ›› Issue (33): 105-110.doi: 10.11924/j.issn.1000-6850.casb18060039

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Profile Differentiation of DTPA-extractable Copper and Zinc in Greenhouse Vegetable Soil with Different Plantation Ages

  

  • Received:2018-06-08 Revised:2018-08-20 Accepted:2018-09-19 Online:2019-11-25 Published:2019-11-25

Abstract: Based on the greenhouse vegetable production base located in Damingtun Township, Xinming City, Liaoning Province, we selected upland and vegetable greenhouses of 2, 5, 10 and 15 years, respectively, collected samples from eight soil layers at the depth of 0-150 cm, and determined DTPA-extractable soil Cu and Zn and related chemical variables, and examined profile distribution of soil Cu and Zn and its leading affecting factors. Results showed that both DTPA-extractable Cu and Zn existed profile differentiation and accumulated in the surface layers, with the concentration greater in 0-60 cm layer than that in layers below 60 cm. Soil organic carbon (SOC) and electric conductivity (EC) had positive effect on DTPA-extractable soil Cu and Zn, while pH value had negative effect on DTPA-extractable Cu and Zn concentration. The leading factor that affected profile Zn distribution was SOC, and factors that affected profile Zn/Cu were EC, SOC and pH value. Furthermore, DTPA- Cu and Zn concentrations were positively and significantly correlated with total N and available N, P and K, indicating a synchronous increase in soil available nutrients induced by heavy application of both chemical and organic fertilizer under greenhouse vegetable cultivation. The results obtained are expected to provide data support for nutrient management of greenhouse soil.

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