Han Min, Liang Yumei, Gao Yong, Yang Wenyuan, Guo Yuefeng
College of Desert Control Science and Engineering, Inner Mongolia Agricultural University, Hohhot, China.
Key Laboratory of Desert Ecosystem Conservation and Restoration, State Forestry and Grassland Administration of China, Hohhot, China.
Front Plant Sci. 2024 Oct 16;15:1423536. doi: 10.3389/fpls.2024.1423536. eCollection 2024.
Scrub root systems play a crucial role in preventing soil erosion and nutrient loss. However, the effects of the root system configuration on soil nutrient dynamics and microbial changes at various evolutionary stages remain poorly understood. In this study, we investigated the relationship between soil physical and chemical properties and the diversity of bacteria and fungi throughout the evolutionary stages of the scrub root systems. This was achieved through a combination of whole-root excavation and root tracing techniques. The results indicated that root diameter was the main factor contributing to the continuous increase in carbon (C): phosphorus (P) and nitrogen (N): P ratios as the scrub sand pile developed. The soil organic carbon (SOC), total soil nitrogen (TN), and total soil phosphorus (TP) contents in the soil in the four evolutionary stages were the highest during the developmental stage, but the change in TP content was not statistically significant ( > 0.05). Partial least squares path modeling and redundancy analysis (RDA) indicated that root system stoichiometric C and N contents were positively correlated with microbial diversity (R = 0.85). There was no correlation between the evolutionary stage and soil nutrient TN, whereas soil nutrient TN was negatively correlated with microbial diversity (R = -0.92). These findings elucidate the relationship between the evolutionary stage of root chemical measurement characteristics, soil elements and microorganisms, and their subsequent effects on root elemental composition and microbial diversity. This study enhances the current understanding of plant-soil interactions in desert steppe ecosystems.
灌丛根系在防止土壤侵蚀和养分流失方面发挥着关键作用。然而，在不同演化阶段，根系构型对土壤养分动态和微生物变化的影响仍知之甚少。在本研究中，我们通过全根系挖掘和根系追踪技术相结合的方法，研究了灌丛根系演化各阶段土壤理化性质与细菌和真菌多样性之间的关系。结果表明，随着灌丛沙堆的发育，根直径是导致碳（C）:磷（P）和氮（N）:P比值持续增加的主要因素。四个演化阶段土壤中的土壤有机碳（SOC）、全氮（TN）和全磷（TP）含量在发育阶段最高，但TP含量的变化无统计学意义（>0.05）。偏最小二乘路径建模和冗余分析（RDA）表明，根系化学计量学C和N含量与微生物多样性呈正相关（R = 0.85）。演化阶段与土壤养分TN之间无相关性，而土壤养分TN与微生物多样性呈负相关（R = -0.92）。这些发现阐明了根系化学计量特征的演化阶段、土壤元素和微生物之间的关系，以及它们随后对根系元素组成和微生物多样性的影响。本研究加深了当前对荒漠草原生态系统中植物 - 土壤相互作用的理解。
