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- Title
Tree species richness and arbuscular mycorrhizal tree fraction of leaf litter increase carbon and nitrogen retention in soil with macroaggregate and glomalin accrual.
- Authors
Ji, Xiaochao; Wang, Shengfang; Guo, Siru; Zhao, Shuting; Dong, Quanxing; Yun, Cholil; Zhang, Xiting; Yang, Yanbo; Wang, Wenjie; Wang, Huimei
- Abstract
Background: Biodiversity loss may impact essential ecological functions. How litter diversity affects soil carbon and nitrogen cycles in temperate forests remains unknown. Methods: We collected fresh leaf litter from eight tree species in Northeast China and incubated it with native soil for one year. We assessed the effect of tree species richness and arbuscular mycorrhizal (AM) tree fraction of leaf litter on soil aggregate formation and soil C and N retention. The soil aggregate size class distribution and the concentrations of glomalin-related soil protein (GRSP), soil organic carbon (SOC), and total nitrogen (TN) in the aggregate size classes were measured. Results: Tree species richness and AM tree fraction of leaf litter promoted SOC and TN accrual in the macroaggregates. They also increased the proportion of macroaggregates and decreased that of the silt and clay fraction. The SOC and TN accrual were accompanied by an increase of easily extractable GRSP (EEG) and total GRSP (TG) in the macroaggregate and a decrease in the silt and clay fraction. Structural equation modeling revealed that aggregate stability was directly increased by EEG (0.476) and TG (0.276). Tree species richness of leaf litter (0.182), AM tree fraction of leaf litter (0.321), and TG (0.430) directly promoted SOC accumulation, while tree species richness of leaf litter (0.338), TG (0.331), and EEG (0.203) increased the TN concentration in bulk soil. Conclusion: This study demonstrates that macroaggregates and GRSP are vital in improving SOC and TN accrual through tree species richness and AM tree fraction of leaf litter.
- Subjects
FOREST litter; SPECIES diversity; NITROGEN in soils; SOIL structure; STRUCTURAL equation modeling
- Publication
Plant & Soil, 2023, Vol 488, Issue 1/2, p377
- ISSN
0032-079X
- Publication type
Article
- DOI
10.1007/s11104-023-05980-1