Dijkstra Feike A, Zhu Biao, Cheng Weixin
Sydney Institute of Agriculture, School of Life and Environmental Sciences, The University of Sydney, Camden, NSW, 2570, Australia.
Institute of Ecology, College of Urban and Environmental Sciences, Key Laboratory for Earth Surface Processes of the Ministry of Education, Peking University, Beijing, 100871, China.
New Phytol. 2021 Apr;230(1):60-65. doi: 10.1111/nph.17082. Epub 2020 Dec 10.
From recent developments on how roots affect soil organic carbon (SOC) an apparent paradox has emerged where roots drive SOC stabilization causing SOC accrual, but also SOC destabilization causing SOC loss. We synthesize current results and propose the new Rhizo-Engine framework consisting of two linked components: microbial turnover and the soil physicochemical matrix. The Rhizo-Engine is driven by rhizodeposition, root turnover, and plant uptake of nutrients and water, thereby accelerating SOC turnover through both stabilization and destabilization mechanisms. This Rhizo-Engine framework emphasizes the need for a more holistic approach to study root-driven SOC dynamics. This framework would provide better understanding of plant root effects on soil carbon sequestration and the sensitivity of SOC stocks to climate and land-use changes.
从根系如何影响土壤有机碳（SOC）的最新研究进展来看，出现了一个明显的悖论：根系既推动了SOC的稳定从而导致SOC积累，又导致了SOC的不稳定从而造成SOC损失。我们综合了当前的研究结果，并提出了新的根际引擎（Rhizo-Engine）框架，该框架由两个相互关联的部分组成：微生物周转和土壤物理化学基质。根际引擎由根际沉积、根系周转以及植物对养分和水分的吸收驱动，从而通过稳定和不稳定机制加速SOC周转。这个根际引擎框架强调需要采用更全面的方法来研究根系驱动的SOC动态。该框架将有助于更好地理解植物根系对土壤碳固存的影响以及SOC储量对气候和土地利用变化的敏感性。
