Factors a ecting trace element content in periurban market garden subsoil in
Yunnan Province, China |
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Authors: | Yanqun Zu Laurent Bock Christian Schvartz Gilles Colinet and Yuan Li |
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Institution: | 1. College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China. E-mail: zuyanqun@yahoo.com.cn
2. Laboratory of Soil Science, Gembloux Agro-bio Technology University, Liege University, Gembloux, Belgium,2. Laboratory of Soil Science, Gembloux Agro-bio Technology University, Liege University, Gembloux, Belgium,3. Laboratory of Soil and Environment, Institute of Advanced Agriculture, Catholic University, Lille, France,2. Laboratory of Soil Science, Gembloux Agro-bio Technology University, Liege University, Gembloux, Belgium and 1. College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China. |
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Abstract: | Field investigations were conducted to measure subsoil trace element content and factors influencing content in an intensive periurban
market garden in Chenggong County, Yunnan Province, South-West China. The area was divided into three di erent geomorphological
units: specifically, mountain (M), transition (T) and lacustrine (L). Mean trace element content in subsoil were determined for Pb (58.2
mg/kg), Cd (0.89 mg/kg), Cu (129.2 mg/kg), and Zn (97.0 mg/kg). Strong significant relationships between trace element content in
topsoil and subsoil were observed. Both Pb and Zn were accumulated in topsoil (RTS (ratio of mean trace element in topsoil to subsoil)
of Pb and Zn >1.0) and Cd and Cu in subsoil (RTS of Cd and Cu 61.0). Subsoil trace element content was related to relief, stoniness,
soil color, clay content, and cation exchange capacity. Except for 7.5 YR (yellow-red) color, trace element content increased with color
intensity from brown to reddish brown. Significant positive relationships were observed between Fe content and that of Pb and Cu.
Trace element content in mountain unit subsoil was higher than in transition and lacustrine units (M > T > L), except for Cu (T > M >
L). Mean trace element content in calcareous subsoil was higher than in sandstone and shale. Mean trace element content in clay texture
subsoil was higher than in sandy and sandy loam subsoil, and higher Cu and Zn content in subsoil with few mottles. It is possible to
model Pb, Cd, Cu, and Zn distribution in subsoil physico-chemical characteristics to help improve agricultural practice. |
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Keywords: | trace elements subsoil topsoil relationships |
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