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| Effects of leguminous green manure crops on cadmium and arsenic availability and enrichment in alkaline soils in Yunnan, China |
| Received:March 23, 2022 Revised:May 31, 2022 |
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| KeyWord:legume;green manure crop;cadmium;arsenic;availability;bioconcentration factor |
| Author Name | Affiliation | E-mail | | Lü Benchun | Institute of Agricultural Environment & Resources, Yunnan Academy of Agricultural Sciences, Kunming 650205, China
College of Resource and Environment, Yunnan Agricultural University, Kunming 650201, China | | | WANG Yingxue | Institute of Agricultural Environment & Resources, Yunnan Academy of Agricultural Sciences, Kunming 650205, China | | | YANG Wei | Kunming Agricultural Products Quality and Safety Center, Kunming 650118, China | | | WANG Wei | Institute of Agricultural Environment & Resources, Yunnan Academy of Agricultural Sciences, Kunming 650205, China | | | CHEN Jianfeng | Institute of Agricultural Environment & Resources, Yunnan Academy of Agricultural Sciences, Kunming 650205, China | | | YIN Mei | Institute of Agricultural Environment & Resources, Yunnan Academy of Agricultural Sciences, Kunming 650205, China | | | CHEN Hua | Institute of Agricultural Environment & Resources, Yunnan Academy of Agricultural Sciences, Kunming 650205, China | | | WANG Zhiyuan | Institute of Agricultural Environment & Resources, Yunnan Academy of Agricultural Sciences, Kunming 650205, China | | | FU Libo | Institute of Agricultural Environment & Resources, Yunnan Academy of Agricultural Sciences, Kunming 650205, China | 1198276883@qq.com | | YANG Zhixin | College of Resource and Environment, Yunnan Agricultural University, Kunming 650201, China | 1213594226@qq.com |
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| Abstract: |
| This study was conducted to evaluate the impact of different legume green manure crops on the cadmium-arsenic（Cd-As） availability and enrichment in Cd and As（Cd-As） co-contaminated soils, to provide a theoretical basis for the safe production of subsequent crops. A field experiment was used to carry out this investigation. The experiment consisted of twelve treatments, and include eleven types of winter legume green manure crops： smooth vetch（smooth vetch, Ximu 333, and Longjian 1） , common vetch（Dongshan, Xuanwei, Yunshao 8, and Dongchuan common vetch） , hairy vetch（Mengshao 1, and Lushao 1） , other green manure（Lathyrus sativus, and crimson clover） , and winter fallow as the control. Soil and plant samples were collected during the full bloom stage and at the same stage as the green manures. The soil physico-chemical properties, Cd and As availability, and the shoot Cd and As content of the green manures were measured, and the bioconcentration and translocation factors of green manures were calculated. The results showed that compared with the winter fallow, the contents of total nitrogen and available phosphorus in the soil planted with Ximu 333 increased by 91.67% and 36.60%, respectively. The fresh grass yield was the highest at 31 016 kg·hm-2. There was no significant change in the available soil Cd and As, and the ability of the plant to enrich the soil Cd and As was lower（0.096 and 0.038, respectively） . Planting Lathyrus sativus increased the total soil nitrogen by 98.61%, decreased the available soil phosphorus by 31.07%, and the yield of fresh grass was the lowest at 10 339 kg·hm-2. There was no significant change in soil available Cd; however, soil available As decreased by 32.82%, and the ability of the plant to enrich the soil Cd and As was higher（0.136 and 0.071, respectively） . Correlation analysis showed that the total soil nitrogen was significant positively correlated with the available soil Cd, and a significant negative correlation with available As, Additionally, the available soil phosphorus had a very significant positive correlation with available soil As, C/N had a very significant negative correlation with fresh grass yield, and a very significant positive correlation with the shoot Cd and As contents. Planting lower C/N Ximu 333 had no significant effect on the Cd and As availability, but had a lower Cd and As enrichment capacity. Planting higher C/N Lathyrus sativus has no significant effect on Cd availability, but can significantly reduce soil As availability, and has a higher Cd and As enrichment capacity. |
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