Three-dimensional mapping of carbon, nitrogen, and phosphorus in soil microbial biomass and their stoichiometry at the global scale
Three-dimensional mapping of carbon, nitrogen, and phosphorus in soil microbial biomass and their stoichiometry at the global scale
复制标题
全球范围土壤微生物量碳、氮、磷的三维绘图及其化学计量
DOI：
10.1111/gcb.16374
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发表时间：
2022-08-21
影响因子：
11.6
通讯作者：
Hagedorn, Frank
中科院分区：
文献类型：
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作者：
Gao, Decai;Bai, Edith;Hagedorn, Frank
土壤微生物生物量和微生物化学计量比对于理解陆地生态系统碳和养分循环具有重要意义。在这里，我们从1626项已发表的研究中收集了12245项土壤微生物生物量观测数据，以绘制微生物量碳（MBC），微生物量氮（MBN），微生物量磷（MBP）及其化学计量的全球模式，使用随机森林模型。MBC，MBN和MBP的浓度是最密切相关的土壤有机碳，而气候因素是最重要的化学计量的微生物生物量的比例。模拟的季节性MBC浓度在苔原和北方森林的夏季达到峰值，但在秋季在亚热带和热带生物群落。在0-30 cm土壤深度，全球平均MBC/MBN、MBC/MBP和MBN/MBP比值估计分别为10、48和6.7。最高的浓度，股票，和微生物的C/N/P比被发现在高纬度地区的苔原和北方森林，可能是由于较高的土壤有机质含量，更大的真菌丰度，和较低的营养物质的可用性在较冷的比在温暖的生物群落。在30-100 cm土壤深度，MBC，MBN，和MBP的浓度最高的温带森林。MBC/MBP比在全球范围内表现出更大的灵活性比MBC/MBN比，可能反映了生理适应和微生物群落随纬度的变化。这项研究的结果是重要的理解在全球范围内的C，N和P循环，以及开发土壤C-循环模型，包括土壤微生物C，N和P作为重要参数。
Soil microbial biomass and microbial stoichiometric ratios are important for understanding carbon and nutrient cycling in terrestrial ecosystems. Here, we compiled data from 12245 observations of soil microbial biomass from 1626 published studies to map global patterns of microbial biomass carbon (MBC), microbial biomass nitrogen (MBN), microbial biomass phosphorus (MBP), and their stoichiometry using a random forest model. Concentrations of MBC, MBN, and MBP were most closely linked to soil organic carbon, while climatic factors were most important for stoichiometry in microbial biomass ratios. Modeled seasonal MBC concentrations peaked in summer in tundra and in boreal forests, but in autumn in subtropical and in tropical biomes. The global mean MBC/MBN, MBC/MBP, and MBN/MBP ratios were estimated to be 10, 48, and 6.7, respectively, at 0-30 cm soil depth. The highest concentrations, stocks, and microbial C/N/P ratios were found at high latitudes in tundra and boreal forests, probably due to the higher soil organic matter content, greater fungal abundance, and lower nutrient availability in colder than in warmer biomes. At 30-100 cm soil depth, concentrations of MBC, MBN, and MBP were highest in temperate forests. The MBC/MBP ratio showed greater flexibility at the global scale than did the MBC/MBN ratio, possibly reflecting physiological adaptations and microbial community shifts with latitude. The results of this study are important for understanding C, N, and P cycling at the global scale, as well as for developing soil C-cycling models including soil microbial C, N, and P as important parameters.