Phytolith-occluded organic carbon accumulation and distribution in a Dendrocalamopsis oldhami bamboo stand ecosystem
Phytolith-occluded organic carbon (PhytOC) has been shown to have an important role in carbon-silicon biogeochemical cycling. To understand the characteristics of PhytOC accumulation, different organs (leaf, branch, and culm), litter, and soil samples were collected in different age stands of 1-3 year old Den-drocalamopsis oldhami bamboo ecosystems from Cangnan County, Zhejiang Province in December 2014. Then, silicon, phytoliths, and PhytOC were analyzed with a correlation analysis. Results of silicon, phytoliths, and PhytOC mass fraction showed that PhytOC content (in g·kg-1) of aboveground litter was (4.28)>leaf (3.16)>branch (0.28)>stalk (0.04). The total accumulation of PhytOC was 22.64 kg·hm-2 with an order (in kg·hm-2) of leaf (13.22)>litter (5.74)>branch (2.71)>stalk (0.96). Also, reserve stocks of PhytOC were 1 302.60 kg·hm-2 in the 0-100 cm soil depth. A highly significant correlation (P<0.01, R2=0.96) was found between silicon and phytolith concentration;a significant correlation (P<0.05, R2=0.62) was revealed for phytolith and PhytOC concentration in plants; and a highly significant correlation (P<0.01, R2= 0.80) was shown with Phy-tOC and total organic carbon in soils. This results shows that the content of PhytOC depend on silicon and phytolith in plants, and related to total organic carbon in soils.
国家科技期刊平台
NSTL
万方数据
维普
