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- W2604140413 abstract "Abstract Semiarid ecosystems are susceptible to changes in dominant vegetation which may have significant implications for terrestrial carbon dynamics. The present study examines the distribution of organic carbon (OC) between particle size fractions in near‐surface (0–0.05 m) soil and the water erosion‐induced redistribution of particle‐associated OC over a grass‐shrub ecotone, in a semiarid landscape, subject to land degradation. Coarse (>2 mm) particles have comparable average OC concentrations to the fine (<2 mm) particles, accounting for ~24–38% of the OC stock in the near‐surface soil. This may be due to aggregate stabilization by precipitated calcium carbonate in these calcareous arid soils. Critically, standard protocols assuming that coarse fraction particles contain no OC are likely to underestimate soil OC stocks substantially, especially in soils with strongly stabilized aggregates. Sediment eroded from four hillslope scale (10 × 30 m) sites during rainstorm events was monitored over four annual monsoon seasons. Eroded sediment was significantly enriched in OC; enrichment increased significantly across the grass‐shrub ecotone and appears to be an enduring phenomenon probably sustained through the dynamic replacement of preferentially removed organic matter. The average erosion‐induced OC event yield increased sixfold across the ecotone from grass‐dominated to shrub‐dominated ecosystems, due to both greater erosion and greater OC enrichment. This erosional pathway is rarely considered when comparing the carbon budgets of grasslands and shrublands, yet this accelerated efflux of OC may be important for long‐term carbon storage potentials of dryland ecosystems." @default.
- W2604140413 created "2017-04-14" @default.
- W2604140413 creator A5041644138 @default.
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- W2604140413 creator A5063177291 @default.
- W2604140413 creator A5073182823 @default.
- W2604140413 creator A5080684639 @default.
- W2604140413 date "2016-04-01" @default.
- W2604140413 modified "2023-10-17" @default.
- W2604140413 title "Dryland, calcareous soils store (and lose) significant quantities of near-surface organic carbon" @default.
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