Department of Ecology, Evolution, and Behavior, University of Minnesota, St. Paul, MN, 55108, USA.
Bren School of Environmental Science and Management, University of California, Santa Barbara, CA, 93106, USA.
Nat Commun. 2019 Feb 12;10(1):718. doi: 10.1038/s41467-019-08636-w.
Agriculturally degraded and abandoned lands can remove atmospheric CO and sequester it as soil organic matter during natural succession. However, this process may be slow, requiring a century or longer to re-attain pre-agricultural soil carbon levels. Here, we find that restoration of late-successional grassland plant diversity leads to accelerating annual carbon storage rates that, by the second period (years 13-22), are 200% greater in our highest diversity treatment than during succession at this site, and 70% greater than in monocultures. The higher soil carbon storage rates of the second period (years 13-22) are associated with the greater aboveground production and root biomass of this period, and with the presence of multiple species, especially C4 grasses and legumes. Our results suggest that restoration of high plant diversity may greatly increase carbon capture and storage rates on degraded and abandoned agricultural lands.
退化和废弃的农业土地可以在自然演替过程中去除大气中的 CO，并将其固定为土壤有机质。然而，这个过程可能很慢，需要一个世纪或更长时间才能恢复到农业前的土壤碳水平。在这里，我们发现，后演替草地植物多样性的恢复导致了年碳存储速率的加速，在第二个时期（第 13-22 年），我们最高多样性处理的碳存储速率比该地点的演替过程高出 200%，比单一种植高出 70%。第二个时期（第 13-22 年）较高的土壤碳存储速率与该时期地上生物量和根系生物量的增加以及多种物种的存在有关，特别是 C4 禾本科植物和豆科植物。我们的研究结果表明，高植物多样性的恢复可能会大大提高退化和废弃农业土地的碳捕获和存储速率。
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