富含硒(Se)的茶是一种广受好评的天然饮料,通常因其补充Se的益处而被食用。然而,这种茶的生产,特别是在硒丰富的茶园,由于土壤酸化,具有挑战性。因此,本研究旨在研究酸化土壤条件下硒变化的影响。首先选取了苏南8个茶园土壤监测点点。设计了模拟酸雨实验和不同酸化方法的实验,系统确定了各种Al离子和Se离子浓度。数据采用R统计软件进行分析,并进行了相关性分析。结果表明,随着pH值的下降,可交换硒(Exc-Se)和残留硒(Res-Se)转化为酸溶性硒(Fmo-Se)和氧化锰硒(Om-Se)。随着pH值的增加,交换态铝(Alex)和水溶性铝(Alw)下降,Fmo-Se和Om-Se下降,Exc-Se和Res-Se增加,归因于Al离子对Se离子的取代减弱的现象。在模拟酸雨实验中,P1与对照(CK)相比,YJW茶园的pH值降低了0.13,Exc-Se降低了4ugmg-1,Res-Se降低了54.65ugkg-1,Fmo-Se增加了2.78ug-1,Om-Se增加了5.94ug-1,而Alex增加了28.53mgkg-1。pH值的降低导致Alex和Alw的含量增加,这进一步导致Exc-Se转化为Fmo-Se和Om-Se。在各种酸化实验中,与CK相比,T6的pH值降低了0.23,Exc-Se含量降低了8.35ugkg-1,Res-Se含量降低了40.62ugkg-1,Fmo-Se含量增加了15.52ugkg-1,而Alex增加了33.67mgkg-1,Alw增加了1.7mgkg-1,Alh减少了573.89mgkg-1。酸化可以触发Exc-Se向Fmo-Se和Om-Se的转化,而由于Alex和Exc-Se之间的复杂相互作用,可用Se的含量可能会降低。该研究为解决土壤酸化引起的茶叶富硒问题提供了理论依据。
Selenium (Se)-enriched tea is a well-regarded natural beverage that is often consumed for its Se supplementation benefits. However, the production of this tea, particularly in Se-abundant tea plantations, is challenging due to soil acidification. Therefore, this study aimed to investigate the effects of changes in Se under acidified soil conditions. Eight tea plantation soil monitoring sites in Southern Jiangsu were first selected. Simulated acid rain experiments and experiments with different acidification methods were designed and soil pH, as well as various Al-ion and Se-ion concentrations were systematically determined. The data were analyzed using R statistical software, and a correlation analysis was carried out. The results indicated that as the pH value dropped, exchangeable selenium (Exc-Se) and residual selenium (Res-Se) were transformed into acid-soluble selenium (Fmo-Se) and manganese oxide selenium (Om-Se). As the pH increased, exchange state aluminum (Alex) and water-soluble aluminum (Alw) decreased, Fmo-Se and Om-Se declined, and Exc-Se and Res-Se increased, a phenomenon attributed to the weakened substitution of Se ions by Al ions. In the simulated acid rain experiment, P1 compared to the control (CK), the pH value of the YJW tea plantation decreased by 0.13, Exc-Se decreased by 4 ug mg-1, Res-Se decreased by 54.65 ug kg-1, Fmo-Se increased by 2.78 ug mg-1, and Om-Se increased by 5.94 ug mg-1 while Alex increased by 28.53 mg kg-1. The decrease in pH led to an increase in the content of Alex and Alw, which further resulted in the conversion of Exc-Se to Fmo-Se and Om-Se. In various acidification experiments, compared with CK, the pH value of T6 decreased by 0.23, Exc-Se content decreased by 8.35 ug kg-1, Res-Se content decreased by 40.62 ug kg-1, and Fmo-Se content increased by 15.52 ug kg-1 while Alex increased by 33.67 mg kg-1, Alw increased by 1.7 mg kg-1, and Alh decreased by 573.89 mg kg-1. Acidification can trigger the conversion of Exc-Se to Fmo-Se and Om-Se, while the content of available Se may decrease due to the complexation interplay between Alex and Exc-Se. This study provides a theoretical basis for solving the problem of Se-enriched in tea caused by soil acidification.