Key Laboratory of Recycling and Eco-treatment of Waste Biomass of Zhejiang Province, Zhejiang University of Science and Technology, Hangzhou, 310023, China.
State Key Laboratory of Subtropical Silviculture, Zhejiang A & F University, Lin'an, Hangzhou, 311300, China.
Chemosphere. 2023 Oct;339:139669. doi: 10.1016/j.chemosphere.2023.139669. Epub 2023 Jul 30.
Manganese (Mn) is a critical element in soils, essential to plant growth. Long-term and intensively managed Lei bamboo (Phyllostachys violascens) stands are usually subjected to severe soil acidification and Mn activation. However, Mn migration from topsoil to deep soil induced by severe soil acidification was poorly recognized and studied. The distribution and changes of the total and the operationally defined Mn forms in soil profiles and its potential stress and environmental effect were investigated in a chronosequence of Lei bamboo stands (0, 2, 6, 11, and 16 years of stand age). The results showed that the Mn amount was significantly decreased in topsoil and accumulated in subsoil with the long-term and intensive fertilizer application. Soil exchangeable Mn and superphosphate extractable Mn demonstrated large different variation to total Mn, whereas their sum was largely higher than and highly correlated with 8-hydroxyquinoline (HQN) extractable Mn. Soil organic carbon, pH value, exchangeable bases, and soil redox simultaneously controlled soil Mn depletion. In conclusion, long-term and intensive fertilizer application leads to soil acidification and accelerated soil Mn depletion in bamboo stand soil, promoting Mn accumulation in bamboo shoots.
锰（Mn）是土壤中的一种关键元素，对植物生长至关重要。长期和集约化管理的雷竹（Phyllostachys violascens）林通常会遭受严重的土壤酸化和 Mn 活化。然而，严重土壤酸化引起的 Mn 从表土向深层土壤的迁移尚未得到充分认识和研究。本研究采用雷竹林（0、2、6、11 和 16 年生）的时间序列，研究了土壤剖面中总 Mn 和操作定义 Mn 形态的分布和变化及其对土壤的潜在胁迫和环境效应。结果表明，长期和集约化施肥导致表土 Mn 量显著减少，而亚表层 Mn 积累。土壤可交换 Mn 和过磷酸钙可提取 Mn 与总 Mn 表现出较大的差异变化，而它们的总和远高于并与 8-羟基喹啉（HQN）可提取 Mn 高度相关。土壤有机碳、pH 值、可交换碱基和土壤氧化还原状态共同控制土壤 Mn 的耗竭。总之，长期和集约化施肥导致竹林土壤酸化和土壤 Mn 耗竭加速，促进了竹笋中 Mn 的积累。
