Estimation of Sequestration Potential via Phytolith Carbon by Important Forest Species in Subtropical China
In this study,seven tree species including broad-leaved forest,coniferous forest,and bamboo forest in subtropical China were selected as experimental materials.The phytolith in the plants was extracted through a microwave digestion method and the phytolith occluded carbon (PhytOC) concentrations in the leaves were determined.The results showed that:1) all the seven tree species had the potential of carbon bio-sequestration within phytoliths.The PhytOC concentrations in dry leaf biomass of different tree species were in the following order:Phyllostachyspubescens (3.31 ± 0.53 g·kg-1) ＞ Liquidambarformosana (1.12 ± 0.33 g·kg-1) ＞ Cyclobalanopsis glaua (0.88 ± 0.09 g·kg-1) ＞ Schima superba (0.49 ± 0.18 g·kg-1) ＞ Pinus massoniana (0.40 ± 0.11 g· kg-1) ＞ Cunninghamia lanceolata (0.30 ± 0.06 g· kg-1) ＞ Castanopsis sclerophylla (0.19 ± 0.04 g· kg-1).2) There were strong linear relationships between Si concentrations and phytolith concentrations (P＜0.05,R2=0.9897),phytolith concentrations and PhytOC concentrations in the leaf dry weight (P＜0.05,R2=0.8816),PhytOC concentrations in phytoliths and PhytOC in the leaf dry weight (P＜0.05,R2=0.3544).3) Phyllostachys pubescens had the highest PhytOC fluxes (0.0506 t-e-CO2· hm-2· a-1),bio-sequestration via phytolith carbon from leaf-litter under 3.87× 106 hm2 of Phyllostachys pubescens stands in subtropical China is estimated to be about 1.96 × 105 t CO2.4) The phytoliths carbon bio-sequestration flux of Cunninghamia lanceolata and Pinus massoniana were 0.0056 and 0.0108 t-e-CO2·hm-2· a-1,respectively,bio-sequestration via phytolith carbon from leaf-litter under 1.13× 107 and 1.20× 107 hm2 of Cunninghamia lanceolata and Pinus massoniana stands is estimated to be about about 6.33 × 104 and 1.30 × 105t CO2,respectively.5) The phytoliths carbon bio-sequestration flux of broadleaved forests ranged from 0.0005 to 0.0193 t-e-CO2· hm-2,bio-sequestration via phytolith carbon from leaf-litter under 2.49× 107 hm2 of broad-leaved forests in subtropical China is estimated to be about 1.25 × 104-48.15 × 104 t CO2.
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NSTL
万方数据
维普
