Combined nitrogen fertilizer and wheat straw increases the cadmium phytoextraction efficiency of Tagetes patula
文献类型： 外文期刊
作者： Ye, Xinxin 1 ; Hu, Hongxiang 1 ; Li, Hongying 2 ; Xiong, Qizhong 1 ; Gao, Hongjian 1 ;
作者机构： 1.Anhui Agr Univ, Sch Resources & Environm, Anhui Prov Key Lab Farmland Ecol Conservat & Poll, Hefei 230036, Anhui, Peoples R China
2.Anhui Acad Agr Sci, Inst Soil & Fertilizer, 40 Nongke South Rd, Hefei 230031, Anhui, Peoples R China
关键词： Cadmium; Hyperaccumulation; N fertilizer; Wheat straw; Tagetes patula
期刊名称：ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY （ 影响因子：6.291； 五年影响因子：6.393 ）
ISSN： 0147-6513
年卷期： 2019 年 170 卷
页码：
收录情况： SCI
摘要： The soil cadmium (Cd) availability and uptake by Tagetes patula grown in two soil types contaminated with Cd and amended with N fertilizer and wheat straw were studied in a pot-culture experiment. The results indicated that N fertilizer treatment (N) and N fertilizer plus straw treatment (NS) promoted T. patula growth, while straw treatment (S) decreased T. patula biomass relative to the control. NS and S treatments increased Cd mobility in the soil and facilitated its uptake by T. patula in Acidic Ferralsols (AF) and Calcaric Cambisols (CC), but the promotion effect was much greater in CC than in AF. The Cd concentrations in the Tagetes shoots in the S and NS treatments were 40% and 27% greater, respectively, than those in the control treatment for AF, and 111% and 80% greater, respectively, for CC. Decreases in soil pH and increases in dissoluble organic carbon concentration after adding N fertilizer and straw were associated with an increase in soil Cd availability and in Cd uptake by T. patula. The results indicate that the NS treatment can alter the soil microenvironment, increasing Cd bioavailability and thus facilitating Cd uptake by T. patula. This work highlights that the combined application of N fertilizer with straw may be a useful way to increase the phytoextraction efficiency of Cd-contaminated soil by the Cd-hyperaccumulator T. patula.
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