The Combined Effects Of UV-B Radiation And Nitrogen Deposition Of Bamboo Leaf Litter Decomposition Shadow

Litter decomposition is one of the important forest ecosystem processes, forest litter decompositionis controlled by substrate quality, global warming, N deposition, the combined effects of enhancedUV-B radiation and biological factors and non-biological factors. Increased nitrogen deposition andenhanced UV-B radiation is very eye-catching two outstanding problems in the current globalenvironmental change. At present, both the composite effect of forest litter decomposition has not beenreported. Subtropical Moso bamboo leaf litter decomposition rate and element release composite roleunder enhanced UV-B radiation, N deposition；enhanced UV-B radiation and N deposition dynamicsstudies: enhanced UV-B radiation, N deposition increased UV-B radiation and N deposition compositeprocessing and control environment Moso bamboo leaf litter decomposition rates were0.33,0.37,0.43and0.32. UV-B radiation and N deposition of Moso bamboo leaf litter decomposition is slow, It plays agreater role in promoting both the composite effect of leaf litter decomposition.UV-B radiation enhanced; N deposition increased hormone-releasing effect of bamboo leaf litter Cwas not significant, But this is the role of both the composite significantly accelerated Moso bambooleaf litter C release. UV-B radiation enhancement hindered the release of Moso bamboo leaf litter Nelements, N deposition as well as both composite role in the release of N Moso bamboo leaf litter hadno significant effect. At the beginning of decomposition, the release of the of Moso bamboo leaf litter Pelements in the processing environment under change, but in the20months after the decompositionCombined effects of N deposition and N deposition and UV-B radiation significantly speed up the Prelease. UV-B radiation enhanced,N deposition Moso bamboo leaf litter lignin degradation does notsignificantly influence the composite effect of both。But in the entire process of decomposition weresignificantly accelerate the degradation of lignin.The experimental results show that the composite effect of UV-B radiation and N deposition Mosobamboo leaf litter decomposition over the role of any single factor, the profound role of bamboo leaf litter decomposition and C P element release and lignin degradation pubes-cens in the context of globalenvironmental change affect the carbon cycle and biogeochemical cycles.