Long-term consumption of tea with high fluoride(F)content has a potential threat to human health.The application of different amounts of biochar to reduce F accumulation in tea leaves has been little studied.In this s...Long-term consumption of tea with high fluoride(F)content has a potential threat to human health.The application of different amounts of biochar to reduce F accumulation in tea leaves has been little studied.In this study,a pot experiment was conducted to investigate the effect of biochar amounts(0,0.5%,2.5%,5.0%,8.0%,and 10.0%,w/w)on tea F content during the tea plant growth.Changes in tea quality,soil F fraction,and soil properties caused by biochar and the relationship with tea F accumulation were also considered.The results showed that the application of biochar amendment significantly reduced water-soluble F contents in tea leaves compared to CK(without biochar),especially in the 8.0%treatment(72.55%).Overall,biochar contributed to improving tea polyphenols and caffeine,but had no significant impact on free amino acids and water leachate.Compared with CK,5.0-10.0%biochar significantly increased soil water-soluble F content due to the substitution of F−with OH−under high pH.Additionally,biochar applied to tea garden soil was effective in decreasing the soil exchangeable aluminum(Ex-Al)content(46.37-91.90%)and increasing the soil exchangeable calcium(Ca^(2+))content(12.02-129.74%)compared to CK,and correlation analysis showed that this may help reduce F enrichment of tea leaves.In general,the application of 5.0-8.0%biochar can be suggested as an optimal application dose to decrease tea F contents while simultaneously improving tea quality.展开更多
基金Chenzhou National Sustainable Development Agenda Innovation Demonstration Zone Construction Project(2021SFQ05)General Project of Hunan Natural Science Foundation(2022JJ30291)+2 种基金Special Project for the Construction of Modern Agricultural Industrial Technology Systems in Hunan Province(Xiang Nongfa)(2019105)Hunan Agricultural University“1515”Talent ProjectPostgraduate Scientific Research Innovation Project of Hunan Province(QL20210172).
文摘Long-term consumption of tea with high fluoride(F)content has a potential threat to human health.The application of different amounts of biochar to reduce F accumulation in tea leaves has been little studied.In this study,a pot experiment was conducted to investigate the effect of biochar amounts(0,0.5%,2.5%,5.0%,8.0%,and 10.0%,w/w)on tea F content during the tea plant growth.Changes in tea quality,soil F fraction,and soil properties caused by biochar and the relationship with tea F accumulation were also considered.The results showed that the application of biochar amendment significantly reduced water-soluble F contents in tea leaves compared to CK(without biochar),especially in the 8.0%treatment(72.55%).Overall,biochar contributed to improving tea polyphenols and caffeine,but had no significant impact on free amino acids and water leachate.Compared with CK,5.0-10.0%biochar significantly increased soil water-soluble F content due to the substitution of F−with OH−under high pH.Additionally,biochar applied to tea garden soil was effective in decreasing the soil exchangeable aluminum(Ex-Al)content(46.37-91.90%)and increasing the soil exchangeable calcium(Ca^(2+))content(12.02-129.74%)compared to CK,and correlation analysis showed that this may help reduce F enrichment of tea leaves.In general,the application of 5.0-8.0%biochar can be suggested as an optimal application dose to decrease tea F contents while simultaneously improving tea quality.
