title: Production of carbon occluded in phytolith is season-dependent in a bamboo forest in subtropical China.
abstract: Carbon (C) occluded in phytolith (PhytOC) is a stable form of C; when PhytOC is returned to the soil through litterfall it is stored in the soil which can be an effective way for long-term C sequestration. However, few estimates on the rate of PhytOC input to the soil are available. To better understand the seasonal dynamics of PhytOC production and the annual rate of stable C sequestration through PhytOC input, we quantified the monthly litterfall, phytolith and PhytOC return to the soil over a year in a typical Lei bamboo (Phyllostachys praecox) forest in subtropical China. The monthly litterfall ranged between 14.81 and 131.18 g m(-2), and the phytolith concentration in the monthly litterfall samples ranged between 47.21 and 101.68 g kg(-1) of litter mass, with the PhytOC concentration in the phytolith ranged between 29.4 and 44.9 g kg(-1) of phytolith, equivalent to 1.8-3.6 g kg(-1) of PhytOC in the litterfall (based on litterfall dry mass). The amount of phytolith input to the soil system was 292.21 ± 69.12 (mean ± SD) kg ha(-1) yr(-1), sequestering 41.45 ± 9.32 kg CO2-e ha(-1) yr(-1) of C in the studied Lei bamboo forest. This rate of C sequestration through the formation of PhytOC found in this study falls within the range of rates for other grass-type species reported in the literature. We conclude that return of C occluded in phytolith to the soil can be a substantial source of stable soil C and finding means to increase PhytOC storage in the soil should be able to play a significant role in mitigating the rapidly increasing atmospheric CO2 concentration.
authors.affiliation: School of Environment and Resources, Zhejiang A&F University, Lin'an, Zhejiang, China.
authors.forename: Zhang-Ting
authors.initials: ZT
authors.lastname: Huang
authors.affiliation: School of Environment and Resources, Zhejiang A&F University, Lin'an, Zhejiang, China; Zhejiang Provincial Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration, Zhejiang A&F University, Lin'an, Zhejiang, China.
authors.forename: Pei-Kun
authors.initials: PK
authors.lastname: Jiang
authors.affiliation: Department of Renewable Resources, University of Alberta, Edmonton, Alberta, Canada.
authors.forename: Scott Xiaochuan
authors.initials: SX
authors.lastname: Chang
authors.affiliation: School of Environment and Resources, Zhejiang A&F University, Lin'an, Zhejiang, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: School of Environment and Resources, Zhejiang A&F University, Lin'an, Zhejiang, China.
authors.forename: Yu-Qi
authors.initials: YQ
authors.lastname: Ying
mesh_terms: D031723:Bambusa / Q000737:chemistry / Q000378:metabolism*; D002244:Carbon / Q000737:chemistry* / Q000378:metabolism; D057965:Carbon Sequestration / Q000502:physiology*; D002681:China; D065928:Forests; D018515:Plant Leaves / Q000737:chemistry* / Q000378:metabolism; D012621:Seasons; D012987:Soil / Q000737:chemistry*; D014197:Trees / Q000737:chemistry / Q000378:metabolism*; D014329:Tropical Climate
chemical_list: D012987:Soil; D002244:Carbon