| 王赟,付利波,梁海,章子含,杨伟,何正海,高嵩涓,曹卫东.绿肥作物对云南旱地土壤镉有效性的影响[J].农业环境科学学报,2021,40(10):2124-2133. |
| 绿肥作物对云南旱地土壤镉有效性的影响 |
| Effects of green manure crops on cadmium availability in dryland soils in Yunnan, China |
| 投稿时间：2021-04-16 |
| DOI：10.11654/jaes.2021-0457 |
| 中文关键词: 绿肥 镉 有效性 可溶性有机质 |
| 英文关键词: green manure cadmium availability dissolved organic matter |
| 基金项目:农用地重金属污染防控模式攻关及应用研究 |
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| 摘要点击次数: 1235 |
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| 中文摘要: |
| 研究不同绿肥作物对云南旱地中度镉（Cd）污染土壤（平均全Cd含量1.21 mg·kg-1）中Cd有效性和植物对Cd吸收、转运的影响，为当地基于绿肥的农作物安全生产措施提供理论支撑。采用盆栽试验，设8个处理：种植紫云英、毛叶苕子、光叶苕子、箭筈豌豆、二月兰、油菜、黑麦草等7种冬季绿肥作物和冬闲对照，于绿肥盛花期及同期测试土壤理化性状、Cd有效性、绿肥作物地上部与地下部Cd含量和富集系数、转运系数。结果表明：与冬闲相比，种植紫云英和黑麦草土壤可溶性有机碳（DOC）含量分别增加29.3%和33.7%。7种绿肥作物均显著降低土壤有效Cd和全量Cd含量，其中箭筈豌豆、光叶苕子、黑麦草处理的土壤有效Cd相比冬闲分别下降了32.1%、29.2%和33.0%；紫云英、毛叶苕子、光叶苕子和箭筈豌豆土壤全量Cd分别下降45.4%、34.9%、34.5%和33.2%。4种豆科绿肥Cd主要积累在地下部，且富集系数和转运系数较小；禾本科与十字花科绿肥Cd主要集中在地上部，富集系数和转运系数均显著高于豆科绿肥，其中二月兰富集系数最高，为0.813，油菜转运系数最高，为0.772。土壤养分对土壤有效Cd有显著正影响；土壤DOC对植株地上部Cd含量有显著负影响，说明DOC含量的升高可以降低植株Cd含量。种植豆科绿肥在显著改善土壤养分、提高土壤质量的同时，能够降低土壤有效Cd含量，且富集系数和转运系数较低。 |
| 英文摘要: |
| This study investigated the impact of different green manure crops on the availability, absorption and transportation of cadmium (Cd)in moderately Cd-contaminated soil(average total Cd content=1.21 mg·kg-1), to provide theoretical support to green manure-based soil safety production methods in Yunnan dryland. A pot experiment was used to carry out this investigation; the experiment consisted of eight treatments, including seven types of winter green manure crops(i.e., Chinese milk vetch, hairy vetch, common vetch, smooth vetch, February orchid, rape, ryegrass), and winter fallow as the control. Soils and plants were sampled during the full bloom stage and the same stage as the green manures. The soil physico-chemical properties, Cd availability, and the Cd content in the roots and shoots of the green manures were measured; then, the bioconcentration and translocation factors of green manures were calculated. Compared with the control, the soil dissolved organic carbon(DOC) content of the Chinese milk vetch and ryegrass treatments increased by 29.3% and 33.7%, respectively. The seven green manure crops all significantly reduced available soil Cd content, in which the available Cd in the soil treated with common vetch, smooth vetch, and ryegrass decreased by 32.1%, 29.2%, and 33.0%, respectively. The total Cd in soil treated with Chinese milk vetch, hairy vetch, common vetch, and smooth vetch decreased by 45.4%, 34.9%, 34.5%, and 33.2%, respectively. The four types of leguminous green manure mainly accumulated Cd in the roots, and the bioconcentration and translocation factors were lower than the other legume types. The Cd in the gramineous and cruciferous green manures was mainly concentrated in the shoots, and the bioconcentration and translocation factors were significantly higher than the leguminous green manure. Among them, the bioconcentration factor of the February orchid was the highest(0.813), and the translocation factor of rape was the highest(0.772). Soil nutrients had significant positive impacts on the available soil Cd, whereas DOC had a relatively significant negative impact on the Cd content of plant shoots. This indicates that an increase in DOC content may reduce the Cd content of plants. Planting leguminous green manure, particularly smooth vetch, improves soil nutrients and quality and reduces the soil available Cd content with a lower bioconcentration factor and translocation factor. |
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