土壤碳
丰度(生态学)
环境科学
土壤水分
持久性(不连续性)
地形湿度指数
相对物种丰度
碳循环
土壤科学
生态学
环境化学
农学
化学
生态系统
生物
地质学
遥感
数字高程模型
岩土工程
作者
Katherine Heckman,Caitlin Hicks Pries,C. R. Lawrence,Craig Rasmussen,Susan E. Crow,Alison M. Hoyt,Sophie F. von Fromm,Shixue Zheng,Shane Stoner,Casey R. McGrath,Jeffrey Beem-Miller,Asmeret Asefaw Berhe,Joseph C. Blankinship,Marco Keiluweit,E. Marín-Spiotta,J. Grey Monroe,Alain F. Plante,Joshua P. Schimel,Carlos Sierra,Aaron Thompson,Rota Wagai
摘要
Understanding the controls on the amount and persistence of soil organic carbon (C) is essential for predicting its sensitivity to global change. The response may depend on whether C is unprotected, isolated within aggregates, or protected from decomposition by mineral associations. Here, we present a global synthesis of the relative influence of environmental factors on soil organic C partitioning among pools, abundance in each pool (mg C g-1 soil), and persistence (as approximated by radiocarbon abundance) in relatively unprotected particulate and protected mineral-bound pools. We show that C within particulate and mineral-associated pools consistently differed from one another in degree of persistence and relationship to environmental factors. Soil depth was the best predictor of C abundance and persistence, though it accounted for more variance in persistence. Persistence of all C pools decreased with increasing mean annual temperature (MAT) throughout the soil profile, whereas persistence increased with increasing wetness index (MAP/PET) in subsurface soils (30-176 cm). The relationship of C abundance (mg C g-1 soil) to climate varied among pools and with depth. Mineral-associated C in surface soils (<30 cm) increased more strongly with increasing wetness index than the free particulate C, but both pools showed attenuated responses to the wetness index at depth. Overall, these relationships suggest a strong influence of climate on soil C properties, and a potential loss of soil C from protected pools in areas with decreasing wetness. Relative persistence and abundance of C pools varied significantly among land cover types and soil parent material lithologies. This variability in each pool's relationship to environmental factors suggests that not all soil organic C is equally vulnerable to global change. Therefore, projections of future soil organic C based on patterns and responses of bulk soil organic C may be misleading.
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