The global biogeography of soil priming effect intensity

作者：Chengjie Ren, Fei Mo, Zhenghu Zhou, Felipe Bastida, Manuel Delgado‐Baquerizo, Jieying Wang, Xinyi Zhang, Yiqi Luo, Timothy J. Griffis, Xinhui Han, Gehong Wei, Jun Wang, Zekun Zhong, Yongzhong Feng, Guangxin Ren, Xiaojiao Wang, Kailiang Yu, Fazhu Zhao, Gaihe Yang, Fenghui Yuan · 发表于：Global Ecology and Biogeography · 年份：2022 · DOI：10.1111/geb.13524 · 被引用次数：52 · 研究领域：Atmospheric and Environmental Gas Dynamics、Geology and Paleoclimatology Research、Isotope Analysis in Ecology

Abstract Aim Fresh carbon (C) inputs to the soil can have important consequences for the decomposition rates of soil organic matter (priming effect), thereby impacting the delicate global C balance at the soil–atmosphere interface. Yet, the environmental factors that control soil priming effect intensity remain poorly understood at a global scale. Location Global. Time period 1980–2020. Major taxa studied Soil priming effect intensity. Methods We conducted a global dataset of CO 2 effluxes in 711 pairwise soils with 13 C or 14 C simple C sources inputs and without C inputs from incubation experiments in which isotope‐labelled C was used to quantify fresh C‐induced rather than exudate‐induced priming. Results Soil priming effect intensity is predominantly positive. Soil texture and C content were identified as the most important factors associated with priming effects, with sandy soils from tropical and mid‐latitudes supporting the highest soil priming effect intensity, and soils with greater C content and fine textures from high latitudes maintaining the lowest soil priming effects. The negative association between C content and soil priming effect intensity was also indirectly driven by changing mean annual temperature, net primary productivity, and fungi : bacteria ratio. Using this information, we generated a global map of soil priming effect intensity, and found that the priming was lower at high latitudes and higher at lower latitudes. Main conclusions Global patterns of...