Xu Yaowen, Huang Runxia, Zhou Benzhi, Ge Xiaogai
Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Hangzhou, China.
Qianjiangyuan Forest Ecosystem Research Station, National Forestry and Grassland Administration of China, Hangzhou, China.
Front Plant Sci. 2022 Feb 7;13:735359. doi: 10.3389/fpls.2022.735359. eCollection 2022.
Plant fine-root decomposition is an important pathway for the reentry of nutrients into the soil. Studies have mainly focused on the loss of fine-root mass and the release characteristics of major elements, including, C, N, and P, but there are few reports on trace elements. In this study, decomposition experiments were conducted to study the dynamic characteristics of mass loss and residual rates of 10 mineral elements in two diameter classes (<2 mm and 2-5 mm) of moso bamboo in the process of fine-root decomposition. The results of the year-long experiment reported herein showed that: (1) fine roots with diameters of less than 2 mm decomposed faster than those with diameters of 2-5 mm; (2) C, N, P, K, Ca, and Mg were released, whereas Fe, Mn, Zn, and Cu were enriched or changed little; (3) decomposition time and root diameter had significant effects on the remaining percentages of C, N, K, Ca, Mg, Mn, Zn, and Cu, and there were interactions among the elements ( < 0.05). The remaining percentages of P and Fe were only affected by decomposition time. This is the first comprehensive report on the variation in 10 elements during the fine-root decomposition of moso bamboo. The study expands our understanding of the release of mineral nutrients during fine-root decomposition, laying a solid theoretical foundation for further research on fine-root decomposition and plant-soil nutrient cycling.
植物细根分解是养分重新进入土壤的重要途径。研究主要集中在细根生物量的损失以及包括碳、氮和磷在内的主要元素的释放特征，但关于微量元素的报道较少。在本研究中，进行了分解实验，以研究毛竹两种直径等级（<2毫米和2 - 5毫米）细根在分解过程中10种矿质元素的质量损失和残留率的动态特征。本文报道的为期一年的实验结果表明：（1）直径小于2毫米的细根比直径为2 - 5毫米的细根分解得更快；（2）碳、氮、磷、钾、钙和镁被释放，而铁、锰、锌和铜则富集或变化不大；（3）分解时间和根直径对碳、氮、钾、钙、镁、锰、锌和铜的残留百分比有显著影响，且元素之间存在相互作用（<0.05）。磷和铁的残留百分比仅受分解时间的影响。这是关于毛竹细根分解过程中10种元素变化的第一份综合报告。该研究扩展了我们对细根分解过程中矿质养分释放的理解，为进一步研究细根分解和植物 - 土壤养分循环奠定了坚实的理论基础。
