Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.16023 |
Beyond bulk: Density fractions explain heterogeneity in global soil carbon abundance and persistence | |
Katherine Heckman; Caitlin E. Hicks Pries; Corey R. Lawrence; Craig Rasmussen; Susan E. Crow; Alison M. Hoyt; Sophie F. von Fromm; Zheng Shi; Shane Stoner; Casey McGrath; Jeffrey Beem-Miller; Asmeret Asefaw Berhe; Joseph C. Blankinship; Marco Keiluweit; Erika Marí; n-Spiotta; J. Grey Monroe; Alain F. Plante; Joshua Schimel; Carlos A. Sierra; Aaron Thompson; Rota Wagai | |
2021-12-16 | |
发表期刊 | Global Change Biology |
出版年 | 2021 |
英文摘要 | 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. |
领域 | 气候变化 ; 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/344217 |
专题 | 气候变化 资源环境科学 |
推荐引用方式 GB/T 7714 | Katherine Heckman,Caitlin E. Hicks Pries,Corey R. Lawrence,et al. Beyond bulk: Density fractions explain heterogeneity in global soil carbon abundance and persistence[J]. Global Change Biology,2021. |
APA | Katherine Heckman.,Caitlin E. Hicks Pries.,Corey R. Lawrence.,Craig Rasmussen.,Susan E. Crow.,...&Rota Wagai.(2021).Beyond bulk: Density fractions explain heterogeneity in global soil carbon abundance and persistence.Global Change Biology. |
MLA | Katherine Heckman,et al."Beyond bulk: Density fractions explain heterogeneity in global soil carbon abundance and persistence".Global Change Biology (2021). |
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