Research on the changes of soil aggregate-relevant organic C (C_org) and nutrients in different aged tea plantations is essential for improving our understanding of soil C_org mitigation and nutrient restitution during tea cultivation. In this study, soil C_org, total nitrogen (N_tot), available phosphorus (P_ava), and the exchangeable cations (that is, potassium (K⁺), sodium (Na⁺), calcium (Ca²⁺), and magnesium (Mg²⁺)) were measured in soil aggregates (0–20 cm depth) from different aged (8-, 17-, 25-, and 43-yr.) tea plantations in the hilly region of southern Guangxi, China. Soil aggregates were divided into large macro-aggregates (>2 mm), medium macro-aggregates (2–1 mm), small macro-aggregates (1–0.25 mm), and micro-aggregates (<0.25 mm) according to a wet-sieving procedure. The tea plantations of 17-yr. were related to the highest stability of soil aggregates; meanwhile, both large macro-aggregates and micro-aggregates were the major fractions carrying soil C_org and nutrients. Long-term tea cultivation was beneficial to soil C_org, N_tot, and P_ava accumulating processes; nevertheless, the increase rates of their storages were declined in the bulk soil as the tea cultivation age increased. Differently, soil exchangeable cation storages decreased with time, and the decreasing rates at the middle phase (from 17- to 25-yr.) of tea cultivation were higher than those at other phases. Hence, developing and implementing a sustainable management scheme is critical to keeping the stability of soil aggregates and maximally reducing the losses of soil exchangeable cations in the process of tea cultivation, particularly after 17-yr., in the hilly region of southern Guangxi, China.

研究不同茶龄茶园土壤团聚体相关有机碳（C _org）和养分的变化，对于增进我们对茶种植过程中对土壤C _org缓解和养分恢复的了解至关重要。在这项研究中，土壤C _org，总氮（N _tot），有效磷（P _ava）和可交换阳离子（即钾（K ⁺），钠（Na ⁺），钙（Ca ²⁺）和镁（Mg ²⁺））是在广西南部丘陵地区不同年龄（8、17、25和43年）茶园的土壤聚集体（0至20 cm深度）中测量的。根据湿润程度，将土壤团聚体分为大的大团聚体（> 2 mm），中的大团聚体（2-1mm），小的大团聚体（1-0.25mm）和微团聚体（<0.25 mm）。筛分程序。17年的茶园。与土壤团聚体的最高稳定性有关；同时，大型的聚集体和微小的聚集体都是土壤C _org和养分的主要组成部分。长期茶树栽培有利于土壤C _org，N _tot和P _ava。积累过程；然而，随着茶树种植年龄的增加，散装土壤中它们的贮藏量增加率下降了。不同的是，土壤可交换阳离子的存储量随时间减少，茶树种植的中期（从17年降到25年）的减少率高于其他阶段。因此，制定和实施可持续管理计划对于保持土壤团聚体的稳定性并最大程度地减少茶叶种植过程中尤其是17年后的茶叶种植过程中土壤可交换阳离子的损失至关重要，在广西南部丘陵地区。