科研之友
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摘要
Phytolith-occluded organic carbon (PhytOC) is an important long-term (up to several thousand years) terrestrial carbon (C) fraction in forest ecosystems. The objectives of this study were to (i) investigate the spatial distribution of PhytOC in Lei bamboo (Phyllostachys praecox C.D. Chu & C.S. Chao.) forests under intensive management (mulching and fertilization) and (ii) assess the role of PhytOC in C sequestration in a Lei bamboo stand and across subtropical China. Phytolith concentrations in Lei bamboo plant components were (P < 0.05) in the following order: rhizome approximate to stump > leaf approximate to branch > culm. The distribution of PhytOC in bamboo leaves, branches, culms, rhizomes, and stumps was 22.2%, 12.1%, 16.1%, 15.9%, and 33.7%, respectively. The PhytOC stock was in the following order (P < 0.05): soil (9361 kg C.ha(-1)) > mulching materials (197.5 kg C.ha(-1)) > belowground plant parts (13.0 kg C.ha(-1)) approximate to aboveground plant parts (12.8 kg C.ha(-1)) approximate to litterfall (11.3 kg C.ha(-1)). The PhytOC accretion rate in the vegetation in the Lei bamboo stand was 19.4 kg C.ha(-1).year(-1), equivalent to 71 kg CO2-eq.ha(-1).year(-1). The soil PhytOC stock decreased markedly with depth and had an accretion rate of 325 kg C.ha(-1).year(-1) for the 0-60 cm soil layer. Based on a PhytOC accretion rate of 0.795 Mg CO2-eq.ha(-1).year(-1), PhytOC accretion rate in the 2.62 x 10(6) ha of Lei bamboo stands in southern China is estimated to be 2.08 x 10(6) Mg CO2-eq.year(-1). In conclusion, intensively managed Lei bamboo stands have a large potential in long-term C sequestration in the form of PhytOC, and the PhytOC stock belowground should not be ignored due to its contribution to the ecosystem level PhytOC stock.
- 出版日期2015-8
- 单位浙江农林大学
