Understory ferns alter soil carbon chemistry and increase carbon storage during reforestation with native pine on previously degraded sites

Maokui Lyu, Jinsheng Xie, Christian P. Giardina, Matthew A. Vadeboncoeur, Xiaojuan Feng, Minhuang Wang, Liisa Ukonmaanaho, Teng Chiu Lin, Yakov Kuzyakov, Yusheng Yang

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5 Citations (Scopus)

Abstract

Reforestation with native species and resulting understory succession can exert important influences on soil organic matter (SOM) storage and chemistry, but a mechanistic understanding of these effects is lacking. We studied different aged Masson pine (Pinus massoniana L.) plantations with and without the understory fern, Dicranopteris dichotoma (Thunb.) Berhn., in subtropical China to assess how SOM over a 30 year sequence of pine growth and fern expansion. To do this, we measured total SOM, lignin-derived phenols, soil carbon (total C and 13 C), soil nitrogen (total N and 15 N), and soil microbial community composition via phospholipid fatty acid (PLFA) analyses. We found that the accumulation of newly-formed SOM outweighed decomposition of old SOM, with the majority of this increase being derived from fern detrital inputs. Where ferns were present, ferns contributed 54–61% of total soil C storage in surface (0–10 cm depth) soils, which was 62–91% higher than pre-reforestation soil C storage. We found that the abundance of lignin-derived compounds was lower in fern dominated soils, perhaps because soils under ferns supported more soil fungi, the primary decomposers of the lignin in soil. Fern soils also showed higher ratios of syringyls to vanillyls and decreased δ 13 C values, an indicator that ferns altered the composition of SOM at the molecular level while contributing significantly to SOM accumulation. Reforestation especially when accompanied by fern expansion also improved soil N and phosphorus (P) status, with observed declines in soil δ 15 N in fern dominated soils aligning with increased nutrient retention and observed increases in soil C storage. Our study highlights the potentially important role of understory ferns in mediating SOM chemistry and soil C storage during ecosystem recovery.

Original languageEnglish
Pages (from-to)80-92
Number of pages13
JournalSoil Biology and Biochemistry
Volume132
DOIs
Publication statusPublished - 2019 May 1

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Keywords

  • Carbon and nitrogen isotopes
  • Ecological restoration
  • Fungal functions
  • Lignin degradation
  • Priming effect
  • Subtropical degraded plantations
  • Understory expansion

ASJC Scopus subject areas

  • Microbiology
  • Soil Science

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