Effects of intercropping accumulator plants and applying their straw on the growth and cadmium accumulation of Brassica
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RESEARCH ARTICLE
Effects of intercropping accumulator plants and applying their straw on the growth and cadmium accumulation of Brassica chinensis L. Yi Tang 1 & Liming Wang 2 & Yongdong Xie 2 & Xuena Yu 3 & LiJin Lin 1 & Huanxiu Li 1 Guochao Sun 2 & Dong Liang 1 & Hui Xia 1 & Xun Wang 1 & Lihua Tu 4
&
Ming’an Liao 2 & Zhihui Wang 2 &
Received: 12 March 2019 / Accepted: 4 May 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Two pot experiments were conducted to study the effects of intercropping cadmium (Cd) accumulator plants (Stellaria media (L.) Villars, Cardamine hirsuta, Cerastium glomeratum Thuill, and Galium aparine L.) and applying their straw on the growth and Cd accumulation of Brassica chinensis L. Intercropping with four accumulator plants reduced the biomass, water content, and photosynthetic pigment content of B. chinensis compared with monoculture. Intercropping with accumulator plants increased the Cd content in the roots and shoot of B. chinensis, and the translocation factor (TF), root bioconcentration factor (root BCF), and shoot bioconcentration factor (Shoot BCF) increased. The soil pH decreased and the soil available Cd content increased by intercropping. Thus, intercropping with four accumulator plants can promote the Cd uptake of B. chinensis. The straw of four accumulator plants reduced the biomass, water content, and photosynthetic pigment content of B. chinensis compared with the control. The straw of S. media and C. hirsute increased the Cd content in the roots and shoots of B. chinensis, TF, root BCF, and shoot BCF. The straw of C. glomeratum and G. aparine decreased the Cd content in the roots and shoots of B. chinensis, TF, root BCF, and shoot BCF. The soil pH increased and the soil available Cd content decreased by application of straw. Thus, the straw of C. glomeratum and G. aparine can reduce the Cd uptake of B. chinensis. Key words Accumulator plants . Intercropping . Straw . Brassica chinensis L . Cadmium
Introduction Vegetables are an essential part of worldwide people’s daily lives, because they are rich in vitamins, minerals, and fiber
Yi Tang, Liming Wang and Yongdong Xie contributed equally to this work. Responsible editor: Elena Maestri * Huanxiu Li [email protected] 1
Institute of Pomology and Olericulture, Sichuan Agricultural University, Wenjiang District, Chengdu 611130, Sichuan, People’s Republic of China
2
College of Horticulture, Sichuan Agricultural University, Wenjiang District, Chengdu 611130, Sichuan, People’s Republic of China
3
College of Horticulture, Northwest A&F University, Yangling, Shaanxi, China
4
College of Forestry, Sichuan Agricultural University, Wenjiang District, Chengdu 611130, Sichuan, People’s Republic of China
required for human health (Hu et al. 2013). In China, vegetables are crops with the most widely cultivated and the most important economic status except for food crops. However, with the rapid development of industry and agriculture, many vegetable fields have been polluted by heavy metals, especially
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