Abstract：
The spatial distribution of plant, soil, and microbial carbon pools, along with their intricate interactions, presents a great challenge for the current carbon cycle research. However, it is not clear what are the characteristics of the spatial variability of these carbon pools, particularly their cross-scale relationships. We investigated the cross-scale spatial variability of microbial necromass carbon (MNC), soil organic carbon (SOC) and plant biomass (PB), as well as their correlation in a tropical montane rainforest using multifractal analysis. The results showed multifractal spatial variations of MNC, SOC, and PB, demonstrating their adherence to power-law scaling. MNC, especially low MNC, exhibited stronger spatial heterogeneity and weaker evenness compared with SOC and PB. The cross-scale correlation between MNC and SOC was stronger than their correlations at the measurement scale. Furthermore, the cross-scale spatial variability of MNC and SOC exhibited stronger and more stable correlations than those with PB. Additionally, this research suggests that when SOC and PB are both low, it is advisable for reforestations to potentiate MNC formation, whereas when both SOC and PB are high some thinning can be advisable to favour MNC formation. Thus, these results support the utilization of management measures such as reforestation or thinning as nature-based solutions to regulate carbon sequestration capacity of tropical forests by affecting the correlations among various carbon pools.
摘要：
植物的空间分布,土壤,和微生物碳库，以及它们复杂的相互作用，对当前的碳循环研究提出了巨大的挑战。然而,尚不清楚这些碳库的空间变异性特征是什么，特别是他们的跨尺度关系。我们研究了微生物坏死碳(MNC)的跨尺度空间变异性，土壤有机碳(SOC)和植物生物量(PB)，以及使用多重分形分析在热带山地雨林中的相关性。结果表明，MNC的多重分形空间变化，SOC,PB,证明他们坚持幂律缩放。MNC,尤其是低MNC，与SOC和PB相比，空间异质性更强，均匀度更弱。MNC和SOC之间的跨尺度相关性强于它们在测量尺度上的相关性。此外，与PB相比，MNC和SOC的跨尺度空间变异性表现出更强，更稳定的相关性。此外,这项研究表明，当SOC和PB都很低时，建议重新造林以加强MNC的形成，而当SOC和PB都很高时，建议进行一些减薄以有利于MNC的形成。因此，这些结果支持利用重新造林或间伐等管理措施作为基于自然的解决方案，通过影响各种碳库之间的相关性来调节热带森林的碳固存能力。
