Abstract
The aims of this research were to determine the accumulation status of total As and discriminate the sources of As by the methods of multivariate statistics. Our results showed that total arsenic contents in top soils increased with cultivation duration, and had a significant positive correlation with cultivation years (R2=0.5192, P=0.009). Based on multivariate statistics, soil organic matters (SOM) and As in greenhouse soils may originate from the same source. It could be concluded that agrichemicals, especially chicken manures may cause As enrichment in greenhouse top soils.
Highlights
Arsenic (As) is a toxic element in the environment due to its well-known carcinogenicity
Some Chinese scientists have proved that heavy metals accumulated in soils of vegetable greenhouses in North China [3, 4]
Few could afford an applicable and convenient method to find the source of heavy metals in greenhouse soil with a statistical method
Summary
Arsenic (As) is a toxic element in the environment due to its well-known carcinogenicity. GVP is a semienclosed artificial and energy-intensive production system, and fertilizers and pesticides containing heavy metals are applied excessively to meet the growing demand for leafy vegetables and maximize economic benefits. The intensive human activities are generating a negative impact on greenhouse environment and agricultural products. Excessive inputs of agrichemicals and huge amounts of irrigation have caused a series of environmental problems such as heavy metal contamination, soil hardening [5, 6]. Some Chinese scientists have proved that heavy metals accumulated in soils of vegetable greenhouses in North China [3, 4]. Few could afford an applicable and convenient method to find the source of heavy metals in greenhouse soil with a statistical method. The objectives of this study have been to determine the accumulation status of total As and discriminate the sources of As by the methods of multivariate statistics
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