中文关键词硒土壤农作物生物有效性影响因素富硒土壤阈值 英文关键词Seleniumsoilcropsbioavailabilityinfluencing factorsSe-rich soil threshold

作者	单位	E-mail
王锐	重庆市地质矿产勘查开发局川东南地质大队, 重庆 400038 重庆市土地质量地质调查重点实验室, 重庆 400038	1372661182@qq.com
邓海	重庆市地质矿产勘查开发局川东南地质大队, 重庆 400038 重庆市土地质量地质调查重点实验室, 重庆 400038
贾中民	重庆市地质矿产勘查开发局川东南地质大队, 重庆 400038	zhongminjia@163.com
严明书	重庆市地质矿产勘查开发局川东南地质大队, 重庆 400038 重庆市土地质量地质调查重点实验室, 重庆 400038
周皎	重庆市地质矿产勘查开发局川东南地质大队, 重庆 400038 重庆市土地质量地质调查重点实验室, 重庆 400038
何忠庠	重庆市地质矿产勘查开发局川东南地质大队, 重庆 400038 重庆市土地质量地质调查重点实验室, 重庆 400038
梁绍标	重庆市地质矿产勘查开发局川东南地质大队, 重庆 400038 重庆市土地质量地质调查重点实验室, 重庆 400038
董金秀	重庆市地质矿产勘查开发局川东南地质大队, 重庆 400038 重庆市土地质量地质调查重点实验室, 重庆 400038
苏黎明	重庆市地质矿产勘查开发局川东南地质大队, 重庆 400038 重庆市土地质量地质调查重点实验室, 重庆 400038

中文摘要 为查明Se在土壤-农作物系统中的分布特征，开展富Se土壤阈值研究，在重庆市黔江区采集表层土壤8789件，深层土壤155件，并采集玉米籽实141件和水稻籽实159件（同时分别采集对应根系土样品141件和159件），分析了土壤及农作物中的Se、有机质、S、Mn、TFe₂O₃、Al₂O₃和K₂O等含量及土壤pH，利用地统计法分析了表层及深层土壤Se的分布特征，基于多元回归分析，研究Se生物有效性的影响因素，基于根系土各组分含量及农作物Se含量进行土壤富Se阈值研究.结果表明，研究区高Se土壤占全区的32.72%；表层土壤及深层土壤Se含量的分布主要受到成土母质的控制，土壤Se源稳定且表层富集现象明显.玉米和水稻的富Se率分别为75.35%、46.81%，土壤有机质和S含量均会限值Se的生物有效性.若种植作物为玉米，建议以0.3 mg·kg^-1作为富Se土壤阈值；若种植作物为水稻，在土壤pH≤7.5时，建议以0.3 mg·kg^-1作为富Se土壤阈值；在土壤pH>7.5时，建议以0.4 mg·kg^-1作为富Se土壤阈值.同样地，若研究区种植有其他大宗农作物，亦可用该方法进行建议富Se土壤阈值研究. 英文摘要 In order to determine the distribution characteristics of Se in soil-crop systems, we carried out a study on the Se-rich soil threshold by collecting 8789 surface soils and 155 deep soils in the Qianjiang District of Chongqing City, China, and 141 corn seeds and 159 rice seeds (simultaneously collecting 141 and 159 corresponding root soil samples, respectively). We then analyzed the Se content, organic matter, S, Mn, TFe₂O₃, Al₂O₃, and K₂O in soils and crops, and soil pH. We also analyzed the surface layer using geostatistical methods and the distribution characteristics of Se in deep soils using multiple regression analysis to study the factors influencing the bioavailability of Se. Based on the contents of each component of root soil and the Se contents of crops, the Se rich threshold was examined. The results showed that the high-Se soils in the study area account for 32.72% of the total area; the distribution of Se contents in the surface and deep soils is mainly controlled by the parent material, the source of soil Se is stable, and the surface enrichment is obvious. The Se-rich rates of corn and rice were 75.35% and 46.81%, respectively, and soil organic matter and S content will limit the bioavailability of Se. If the planted crop is corn, it is recommended to use 0.3 mg·kg^-1 as the Se-rich soil threshold; if the planted crop is rice, when the soil pH is ≤ 7.5, it is recommended to use 0.3 mg·kg^-1 as the Se-rich soil threshold, while at a soil pH>7.5, it is recommended to use 0.4 mg·kg^-1 as the threshold. Similarly, if other large crops are planted in the study area, this method can also be used to carry out a study on the proposed Se-rich soil threshold.

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