| 王义,王勃然,周文涛,祝志娟,刘莉,祝博文,傅志强.生物炭与水分管理耦合对晚稻镉迁移与积累的影响[J].农业环境科学学报,2020,39(7):1479-1485. |
| 生物炭与水分管理耦合对晚稻镉迁移与积累的影响 |
| Effects of biochar application and water management coupling on cadmium transfer and accumulation in late-season rice |
| 投稿时间：2019-12-22 |
| DOI：10.11654/jaes.2019-1408 |
| 中文关键词: 水稻 水分管理 生物炭 糙米镉含量 转运系数 |
| 英文关键词: rice water management biochar cadmium content in brown rice transport coefficient |
| 基金项目:湘北水稻生态优质技术集成与示范（2019YFD0301003）；稻田生态种养产业化关键技术研究与示范（2017NK2281） |
| 作者 | 单位 | E-mail | | 王义 | 湖南农业大学农学院, 长沙 410128
农业农村部华中地区作物栽培科学观测实验站, 长沙 410128 | | | 王勃然 | 湖南农业大学农学院, 长沙 410128
农业农村部华中地区作物栽培科学观测实验站, 长沙 410128 | | | 周文涛 | 湖南农业大学农学院, 长沙 410128
农业农村部华中地区作物栽培科学观测实验站, 长沙 410128 | | | 祝志娟 | 湖南农业大学农学院, 长沙 410128
农业农村部华中地区作物栽培科学观测实验站, 长沙 410128 | | | 刘莉 | 湖南农业大学农学院, 长沙 410128
农业农村部华中地区作物栽培科学观测实验站, 长沙 410128 | | | 祝博文 | 湖南农业大学农学院, 长沙 410128
农业农村部华中地区作物栽培科学观测实验站, 长沙 410128 | | | 傅志强 | 湖南农业大学农学院, 长沙 410128
农业农村部华中地区作物栽培科学观测实验站, 长沙 410128 | zqf_cis@126.com |
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| 中文摘要: |
| 选择中度镉污染稻田，以晚稻品种H优518为试验材料，采用前干后淹（W1）、前淹后干（W2）、长期淹水（W3）、常规水分管理（W4）4种水分管理方式为主处理，施用4个水平（C1-5 t·hm-2、C2-7.5 t·hm-2、C3-10 t·hm-2、C4-0 t·hm-2）的生物炭为副处理，通过大田裂区试验研究生物炭与水分管理耦合对土壤pH以及晚稻镉吸收、迁移与积累的影响。结果表明：16个处理的pH均有上升，上升幅度在0.65~1.37个单位，W3-C3上升幅度最大，达到1.37个单位；各处理中，W3-C3对糙米镉含量降低效果最为明显，与对照（W4-C4）相比，糙米中镉含量降低了59.10%，含量为0.18 mg·kg-1，同一主处理中，各器官镉含量均呈现随着施炭量增加而下降的趋势；各处理均能够减弱镉在水稻器官间的转运能力，与对照相比，水稻吸收的镉由根部向糙米、由茎叶向糙米的转运系数下降最多的处理分别为W3-C3、W3-C2，下降幅度分别为38.48%、27.03%；经过处理，糙米镉积累量显著降低，积累量最低的处理为W3-C3，与对照相比，下降幅度为53.44%。综上，长期淹水与生物炭耦合能有效抑制晚稻对镉的吸收、迁移与积累，在长期淹水条件下，生物炭施用量为10 t·hm-2时降镉效果最为明显。 |
| 英文摘要: |
| In the present study, rice fields with moderate cadmium pollution were selected and the late-rice variety ‘H You 518’ was used as test material to explore the effects of biochar and water management coupling on soil pH and cadmium absorption. Cadmium migration and accumulation in late rice were studied through field split-plot experiments. Four water management methods, namely pre-dry and post-flood(W1), pre-flood and post-dry(W2), long-term flood(W3), and conventional water management(W4), were the main treatments, and biochar with four gradients(C1-5 t·hm-2, C2-7.5 t·hm-2, C3-10 t·hm-2, and C4-0 t·hm-2)was used as the secondary treatments. The results showed that the pH values of all 16 treatments increased with 0.65~1.37 units, and the increase in W3-C3 was the largest, reaching 1.37 units. In each treatment, W3-C3 had the greatest effect on reducing the cadmium content in brown rice:Compared with the control(W4-C4), the cadmium content in brown rice was reduced by 59.10%, with a content of 0.18 mg·kg-1. In the same main treatment, the cadmium content in each organ showed a decreasing trend with increased carbon application. Each treatment could reduce the transport capacity of cadmium between rice organs. Compared with the control, the treatments with the largest decrease in the transport coefficient of cadmium absorbed by rice from root to brown rice and from stem and leaf to brown rice were W3-C3 and W3-C2, with decreases of 38.48% and 27.03%, respectively. After treatment, cadmium accumulation in brown rice decreased significantly, and the lowest accumulation was recorded for W3-C3, with a decrease of 53.44% compared with that of the control. In summary, the coupling of long-term flooding and biochar could effectively inhibit the absorption, migration, and accumulation of cadmium in late rice. Under long-term flooding, the effect of reducing cadmium was most obvious when the biochar application amount was 10 t·hm-2. |
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