Arsenic (As) contamination has been identified as a tangible risk related to soil and land degradation, and identifying pristine regions is, therefore, important for the long‐term safety considerations of humans. The Red River Basin is among the largest cultivation regions in Southeast Asia that provides rice for local consumers as well as for exports. While the lowland part of the Red River Delta (RRD) has been recently identified as an area suffering from As risk, little is known about the upland terrace part. In this study, terraced paddy was found to be an ecosystem with a lower accumulation of As. The median As value, , in the terraced paddy soil was 2.22 mg kg⁻¹, while almost no As was detected in the rice grain. The content of soil As of the RRD (= 6.12 mg kg⁻¹) was equal to the global average and led to a significant accumulation of As in rice grain ( = 221 μg kg⁻¹). Among the soil properties, soil water‐soluble silicon (Si_H2O) appeared to be the most effective factor for reducing As translocations to rice. As the diminution of available Si can narrow the arable land that produces non or low‐As rice, this is likely an emerging factor that affects land degradation. With its low‐As rice status, the terraced paddy can be highlighted as a pristine part for rice growing. The fact that As accumulates in rice at different levels between terraced and lowland paddy regions can be considered in developing As mitigation strategies or rice repricing.

中文翻译：

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越南红河流域低地稻田和梯田稻米中砷的比较研究

砷（As）污染已被确定为与土壤和土地退化相关的明显风险，因此，确定原始区域对于人类的长期安全考虑很重要。红河流域是东南亚最大的种植区之一，为当地消费者和出口提供大米。虽然最近已将红河三角洲（RRD）的低地部分确定为遭受As风险的地区，但对高地阶地部分知之甚少。在这项研究中，发现梯田水稻是一种砷含量较低的生态系统。梯田水稻土的中位As值为2.22 mg kg ^-1，而稻谷中几乎未检测到As。RRD的土壤As含量（= 6.12 mg kg ^-1）等于全球平均水平，并导致水稻籽粒中As的大量积累（= 221μgkg ^-1）。在土壤特性中，土壤水溶性硅（Si _H2O）似乎是减少砷向水稻转运的最有效因素。由于可用硅的减少可以使生产非或低砷水稻的耕地面积缩小，这很可能是影响土地退化的一个新兴因素。由于稻田处于低砷状态，因此可以强调梯田水稻是水稻生长的原始部分。在制定As缓解措施或重新定价水稻时，可以考虑As在梯田和低地稻田之间在不同水平的水稻中积累的事实。