Clarifying the evidence for microbial‐ and plant‐derived soil organic matter, and the path toward a more quantitative understanding

Global Change Biology, Journal Year: 2022, Volume and Issue: 28(24), P. 7167 - 7185

Published: Aug. 31, 2022

Predicting and mitigating changes in soil carbon (C) stocks under global change requires a coherent understanding of the factors regulating organic matter (SOM) formation persistence, including knowledge direct sources SOM (plants vs. microbes). In recent years, conceptual models have emphasized primacy microbial-derived inputs, proposing that microbial physiological traits (e.g., growth efficiency) are dominant controls on quantity. However, quantitative studies challenged this view, suggesting plants make larger contributions to than is currently recognized by paradigm. review, we attempt reconcile these perspectives highlighting variation across estimates plant- versus may arise part from methodological limitations. We show all major methods used estimate plant substantial shortcomings, uncertainty our current estimates. demonstrate there significant overlap chemical signatures compounds produced microbes, roots, through extracellular decomposition litter, which introduces into use common biomarkers for parsing SOM, especially mineral-associated (MAOM) fraction. Although review contributed deeper limitations with constrain light advances, suggest now critical time re-evaluate long-standing methods, clearly define their limitations, develop strategic plan improving quantification SOM. From synthesis, outline key questions challenges future research mechanisms stabilization pathways.

Language: Английский

---

Nitrogen increases soil organic carbon accrual and alters its functionality

Global Change Biology, Journal Year: 2023, Volume and Issue: 29(7), P. 1971 - 1983

Published: Jan. 6, 2023

Abstract Nitrogen (N) availability has been considered as a critical factor for the cycling and storage of soil organic carbon (SOC), but effects N enrichment on SOC pool appear highly variable. Given complex nature pool, recent frameworks suggest that separating this into different functional components, example, particulate (POC) mineral‐associated (MAOC), is great importance understanding predicting dynamics. Importantly, little known about how these N‐induced changes in components (e.g., ratios among fractions) would affect functionality given differences nutrient density, resistance to disturbance, turnover time between POC MAOC pool. Here, we conducted global meta‐analysis 803 paired observations from 98 published studies assess effect addition fractions. We found addition, average, significantly increased pools by 16.4% 3.7%, respectively. In contrast, both were remarkably decreased (4.1% 10.1%, respectively). Increases positively correlated with aboveground plant biomass hydrolytic enzymes. However, positive responses increases microbial biomass. Our results although reactive deposition could facilitate C sequestration some extent, it might decrease time, disturbance study provides mechanistic insights its at scale, which pivotal dynamics especially future scenarios more frequent severe perturbations.

Language: Английский

---

Unraveling the potential of microbes in decomposition of organic matter and release of carbon in the ecosystem

Journal of Environmental Management, Journal Year: 2023, Volume and Issue: 344, P. 118529 - 118529

Published: July 5, 2023

Language: Английский

---

Plant litter strengthens positive biodiversity–ecosystem functioning relationships over time

Trends in Ecology & Evolution, Journal Year: 2023, Volume and Issue: 38(5), P. 473 - 484

Published: Jan. 2, 2023

Language: Английский

---

Soil organic matter formation and loss are mediated by root exudates in a temperate forest

Nature Geoscience, Journal Year: 2022, Volume and Issue: 15(12), P. 1011 - 1016

Published: Nov. 28, 2022

Language: Английский

---

Nitrogen fertilizer builds soil organic carbon under straw return mainly via microbial necromass formation

Soil Biology and Biochemistry, Journal Year: 2023, Volume and Issue: 188, P. 109223 - 109223

Published: Oct. 22, 2023

Language: Английский

---

Tree species diversity increases soil microbial carbon use efficiency in a subtropical forest

Global Change Biology, Journal Year: 2023, Volume and Issue: 29(24), P. 7131 - 7144

Published: Oct. 19, 2023

Plant communities strongly influence soil microbial and, in turn, carbon (C) cycling. Microbial use efficiency (CUE) is an important parameter for predicting C accumulation, yet how plant and community traits CUE remains poorly understood. Here, we determined influenced by traits, studying a natural gradient of species diversity subtropical forest. Our results showed that increased with increasing tree diversity, suggesting correlation between storage. The specific properties explained the greatest variation were associated (biomass, enzyme activities ratio oligotrophic to copiotrophic taxa); there weaker correlations plant-input properties, chemistry organic quality its mineral protection. Overall, high was correlated diversity: higher substrate availability (simple SOM chemical structures weak associations) growth rates despite dominance strategists. point mechanism which may increase forest sink affecting community.

Language: Английский

---

Distinct, direct and climate‐mediated environmental controls on global particulate and mineral‐associated organic carbon storage

Global Change Biology, Journal Year: 2023, Volume and Issue: 30(1)

Published: Dec. 25, 2023

Abstract Identifying controls on soil organic carbon (SOC) storage, and where SOC is most vulnerable to loss, are essential managing soils for both climate change mitigation global food security. However, we currently lack a comprehensive understanding of the drivers especially with regards particulate (POC) mineral‐associated (MAOC). To better understand hierarchical POC MAOC, applied path analyses fractions, (i.e., mean annual temperature [MAT] precipitation minus potential evapotranspiration [MAP‐PET]), (C) input net primary production [NPP]), property data synthesized from 72 published studies, along generated National Ecological Observatory Network pits ( n = 901 total observations). assess utility investigating MAOC separately in storage controls, then compared these results another analysis predicting bulk storage. We found that negatively related MAT pH, while positively NPP MAP‐PET, but % sand. Our revealed similar trends explained less variation C than our analyses. Given pH impose constraints microbial decomposition, this indicates primarily controlled by loss processes. In contrast, strong relationships variables plant productivity constraints, moisture, mineral surface availability sorption indicate climate‐driven variations inputs soil, as well stabilization mechanisms. Altogether, demonstrate separate environmental variables, further justifying need quantify model fractions forecast responses change.

Language: Английский

---

Dual role of silt and clay in the formation and accrual of stabilized soil organic carbon

Soil Biology and Biochemistry, Journal Year: 2024, Volume and Issue: 192, P. 109390 - 109390

Published: March 6, 2024

Language: Английский

---

Litter quality controls the contribution of microbial carbon to main microbial groups and soil organic carbon during its decomposition

Biology and Fertility of Soils, Journal Year: 2024, Volume and Issue: 60(2), P. 167 - 181

Published: Jan. 6, 2024

Language: Английский

---