[Effect of UV-B radiation on the chemical composition and subsequent decomposition of Cyclobalanopsis glauca leaf litter].
A experiment on leaf litter decomposition was carried out to evaluate the effects of UV-B radiation on the chemical composition and subsequent decomposition of leaf litter in humid subtropical forest systems. The leaf litter was derived from Cyclobalanopsis glauca seedlings exposed to elevated and ambient ultraviolet B (UV-B) radiation treatments during growth for one year. The results showed that UV-B treatment significantly increased the original N, K and P content of leaf litter by 154.9%, 29.8% and 9.7%, respectively, and decreased the ratios of C: N, lignin: N and C: P of leaf litter by 60.5%, 61.7% and 8.5%, respectively (P < 0.05), but had no significant effect on C and lignin content. The decomposition of leaf litter derived from seedlings exposed to elevated UV-B treatment during growth was faster, but did not show significant difference from that of ambient UV-B treatment. Exposure to elevated UV-B radiation during growth did not significantly influence the K release, but promoted the P release and retarded the N accumulation during leaf litter decomposition. Our result will contribute to the better understanding of the role of UV-B radiation in moist subtropical forest ecosystem.
The Nurturing Station for the State Key Laboratory of Subtropical Silviculture, Zhejiang Provincial Key Laboratory of Carbon Cycling and Carbon Sequestration in Forest Ecosystems, Zhejiang A&F University, Lin'an 311300, China. xzsong@126.com
Xin-Zhang
XZ
Song
Tao
T
Bu
Shui-Kui
SK
Zhang
Hong
H
Jiang
Zhi-Kun
ZK
Wang
Ming-Shui
MS
Zhao
Yong-Jun
YJ
Liu
D003198:Computer Simulation; D017753:Ecosystem; D004784:Environmental Monitoring; D009584:Nitrogen / Q000032:analysis / Q000378:metabolism; D010758:Phosphorus / Q000032:analysis / Q000378:metabolism; D018515:Plant Leaves / Q000378:metabolism / Q000528:radiation effects*; D014197:Trees / Q000378:metabolism* / Q000528:radiation effects; D014329:Tropical Climate; D014466:Ultraviolet Rays
D010758:Phosphorus; D009584:Nitrogen