叶菜类蔬菜产地镉环境质量类别划分技术研究

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Abstract In order to establish the classification thresholds of cadmium content in the soil in the leafy vegetable production area in China, first the effects of vegetable types and soil physical and chemical properties on bioconcentration factor (BCF) was investigated. Then, the species sensitivity distribution (SSD) method was applied to develop the thresholds based on the routine monitoring data from the main vegetable production areas provided by the Agro-Environmental Monitoring Center of China. Results showed that the accumulation of cadmium in leafy vegetables were extremely and significantly influenced by soil pH, cation exchange capacity (CEC) and soil organic matter (SOM) (P<0.01). A three-factor bioavailability model was established as lg(BCF)=-0.122pH+0.025lgSOM- 0.048lgCEC+1.252(R²=0.746,P<0.01,n=134). The fitted model could explain 74.6% of the total variation in leaf vegetable enrichment. The model was then used to normalize BCF of leaf vegetable cadmium under different soil physical and chemical properties to minimize the influence of soil physical and chemical properties on cadmium accumulation, and to highlight the inherent sensitivity of leaf vegetable. The SSD curve was constructed by a log-logistic fitting function which was based on the normalized BCF. The results showed that the sensitivity of different leafy vegetables to cadmium was significant. Based on the protection rate of 80% (priority protection), 50% (safe use), and 5% (strictly control) for leafy vegetables, we derived the cadmium thresholds from SSD curves for these three categories: soil pH≤6.5, 6.5

Key words： origin of agricultural products species sensitivity distribution leafy vegetables cadmium environmental quality categories

Received: 09 February 2020

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	Articles by authors
	DOU Wei-qiang
	AN Yi
	QIN Li
	LIN Da-song
	DONG Ming-ming

Cite this article:

DOU Wei-qiang,AN Yi,QIN Li等. Study on the classification technology of the environmental quality category of cadmium in leaf vegetable production area[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(9): 3942-3951.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I9/3942

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