Land, Volume 12, Issue 5
2023 May - 178 articles
Cover Story: Forests store large quantities of soil organic C (SOC). We studied two dominant forest types in northeastern China: secondary mixed forest (MF) and larch plantation forest (LF). Samples from the surface organic layer to 0-40 cm mineral soils were collected and separated into (1) aggregate and non-aggregated fractions and (2) particulate and mineral-associated organic matter (POM and MAOM). SOC was 13.6% lower in LF than MF (8609 ± 1180 vs. 9969 ± 2084 g C m-2) and in both forests, mainly stored in mineral soils, aggregates, and MAOM. The proportion of C in microaggregates and MAOM increased from Oa+e to 40 cm layer, with C/N ratios smaller and δ13C heavier in MAOM than POM. Our study demonstrated the significance of aggregate formation, mineral association, and deep soil distribution on SOC storage and stability. View this paper
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Land - ISSN 2073-445X