Institute of Environmental Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Hanoi, Viet Nam.
Institute of Geography, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Hanoi, Viet Nam.
Environ Geochem Health. 2020 Nov;42(11):3753-3764. doi: 10.1007/s10653-020-00626-y. Epub 2020 Jun 24.
Rice production in floodplain deltas is currently vulnerable to climate change and contamination from anthropogenic activities. The relocation of rice production to upland regions could be an option for increasing the sustainability of rice production. Our study evaluated the spatial patterning of heavy metals, i.e., copper (Cu) and cadmium (Cd), in rice along a topogradient from terrace to lowland areas in the Red River basin. The dataset obtained from the analysis of 61 farm sites throughout the whole basin indicated a large discrepancy in the Cu and Cd contents in rice grains from terrace and lowland paddies. While Cu and Cd were not found in most of the rice grain samples from the terrace paddies, the median Cu and Cd contents of the lowland paddy rice were 1.895 and 0.033 mg kg, respectively. Assessing the relationship of Cu and Cd in the soil-rice system to soil properties revealed possible correlations between soil available silicon (Si) and the Cu and Cd contents in rice grain. The enrichment of Si in rice plants likely reduces the translocation of Cu and Cd from soil to grain. Therefore, management of the Si supply, particularly in lowland paddies, should be highlighted as a way to reduce dietary intake of Cu and Cd.
目前，洪泛平原三角洲的水稻生产容易受到气候变化和人为活动污染的影响。将水稻生产转移到旱地可能是提高水稻生产可持续性的一种选择。我们的研究评估了重金属（即铜（Cu）和镉（Cd））在红河盆地从梯田到低地地区的地形梯度上的水稻中的空间分布模式。从整个流域的 61 个农场地点的分析中获得的数据表明，梯田和低地稻田的稻谷中 Cu 和 Cd 含量存在很大差异。虽然在大多数来自梯田稻田的稻谷样本中没有发现 Cu 和 Cd，但低地稻田稻谷的 Cu 和 Cd 含量中位数分别为 1.895 和 0.033 mg kg。评估土壤-水稻系统中 Cu 和 Cd 的关系与土壤特性表明，土壤有效硅（Si）与稻谷中 Cu 和 Cd 含量之间可能存在相关性。Si 在水稻植株中的富集可能会降低 Cu 和 Cd 从土壤向谷物的转移。因此，应特别强调管理 Si 供应，特别是在低地稻田，以减少膳食中 Cu 和 Cd 的摄入。
