부산대학교 도서관

Background Tea (Camellia sinensis L) has efficient aluminum (Al) accumulation mechanisms, Al accumulation in different tea varieties is affected by the distribution of Al fractions in soil. However, little is known about the changes in Al fractions based on the aggregates in soils of different tea varieties. Methods The distribution of Al fractions in aggregates collected from soils planted with four tea varieties (C. sinensis 'Fuding Dabaicha' (FD), Chuancha No. 3 (CC3), Chuanmu No. 217 (CM217) and Chuannong Huangyazao (CN)) was investigated by continuous extraction method. Results Results showed significant differences in the distributions of Al fractions among the soils. The FD soil had the highest organic matter-bound Al (Or-Al) concentration, which was related to its high proportion of > 5 mm aggregates and the high Or-Al concentration in the > 5 mm aggregates. The CC3 soil had the highest concentrations of total aluminum (T-Al), water-soluble aluminum (Ws-Al) and exchangeable aluminum (Ex-Al), and the accumulation of T-Al, Ws-Al and Ex-Al depended on the highest concentrations of T-Al, Ws-Al and Ex-Al in the > 5 mm and < 0.25 mm aggregates among the four soils. Therefore, these differences in the Al fraction distributions among the soils were related to the changes in soil aggregate compositions and the aggregate-associated Al fractions. Conclusions This study helps elucidate the mechanisms of Al sequestration, and provides evidence for developing appropriate management plans to prevent an increase in Al concentrations in the soils of CC3 and FD by adjusting the soil aggregate composition and the Al concentration of aggregates.
Author(s): Jia Yang [sup.1] , Zicheng Zheng [sup.1] , Tingxuan Li [sup.1] , Daihua Ye [sup.1] , Yongdong Wang [sup.1] , Huagang Huang [sup.1] , Haiying Yu [sup.1] , Tao [...]