Dynamic characteristics of the litter decomposition rate and carbon,nitrogen and phosphorus release during the degradation process of peatland
This study aims to investigate the decomposition rate and dynamic characteristics of carbon,nitrogen,and phosphorus release of litter during the degradation process of peatland,in an attempt to provide certain basic data for restoration of degraded peatland.The litter were collected from four types of peatlands,including undegraded peatland(UP),lightly degraded peatland(LDP),heavily degraded peatland(HDP),drainage afforestation(DA).The results showed that there were significant differences of mass loss rate,decomposition rates,and carbon relative return index(CRRI),nitrogen relative return index(NRRI),phosphorus relativereturm index(PRRI)between four types of peatlands.During the experiment period of 90 days,the litter had higher mass loss rate and decomposition rates than the other times.After the 120 days,the litter from UP lost 15.31 percent of its weight,LDP lost 11.69 percent of its weight,HDP lost 7.16 percent of its weight,DA lost 20.11 percent of its weight,and DA had highest decomposition rates.The CRRIs of four types of peatlands were 17.32%,16.72%,4.22%and 20.17%,the NRRIs of them were-0.86%,-25.22%,28.03%and 5.15%,andthe PRRIsof them were 4.57%,-97.03%,6.19%and-29.56%,respectively.The C of four types of peatlands showed a net release pattern,the N of the litter from HDP and DA showed a net release pattern,but the litter from LDP showed a net accumulation pattern,the P of the litter from LDP,HDP and DA showed a net accumulation pattern,but DA showed a net release pattern.
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万方数据
