杉木阔叶化改造对生态系统碳储量的影响

Effect of Chinese Fir Broadleaved Reformation on Ecosystem Carbon Storage

由于研究不同杉木混交林碳储量特征对发展高碳汇人工林具有重要意义,在福建省宁化国有林场开展了二代萌生杉木纯林改造为不同混交林的试验,分析了不同杉木阔叶树混交林乔木层、林下植被层、凋落物层和土壤层碳储量特征。结果表明:杉木+闽楠、杉木+木荷和杉木+桤木混交林乔木层碳储量分别为杉木纯林的60.90%、76.41%和99.39%,林下植被碳储量分别为杉木纯林的119.68%、78.13%和48.04%,3种混交林凋落物碳储量与杉木纯林之间没有显著差异,0~60 cm土层混交林土壤有机碳碳储量分别比杉木纯林增加了4.50%、15.50%和21.99%。杉木+木荷和杉木+桤木混交林生态系统总碳储量均高于杉木纯林,而杉木+闽楠混交林生态系统总碳储量略低于杉木纯林。可见,选择不同树种与杉木混交对生态系统总碳储量有重要影响。

Research on the carbon storage characteristics of different Chinese fir(Cunninghamia lanceolata)mixed plantations is of great significance to the development of high-carbon sink plantations.The experiment that the second-generation Chinese fir monoculture was converted to different Chinese fir mixed plantations was carried out in Ninghua National Forest Farm of Fujian Province.The carbon storage characteristics of the arbor layer,understory vegetation layer,litter layer and soil layer of different mixed plantations of Chinese fir broad-leaved trees was investigated.The results showed that the carbon storage in the arbor layer of Chinese fir+Phoebe bournei,Chinese fir+Schima superba and Chinese fir+Alnus cremastogyne mixed plantations accounted for 60.90%,76.41%and 99.39%of the Chinese fir monoculture plantation,respectively.The carbon storage of understory vegetation accounted for 119.68%,78.13%and 48.04%of the Chinese fir monoculture plantation,respectively.There was no significant difference in the litter carbon storage between the three mixed plantations and the monoculture plantation.The soil organic carbon storage of the mixed plantations in the 0-60cm soil layer increased by 4.50%,15.50%,and 21.99%,respectively,compared with the monoculture plantation.The total ecosystem carbon storage of Chinese fir+S.superba and Chinese fir+A.cremastogyne mixed plantation were higher than those of Chinese fir monoculture plantation,while it was slightly lower in the Chinese fir+P.bournei mixed plantation than that of Chinese fir monoculture plantation.Therefore,different Chinese fir mixed plantations had great influence on the total ecosystem carbon storage.