摘要:The carbon content, storage and distribution in Masson pine (Pinus massoniana), Chinese Fir (Cunninghamia lanceolata) and eucalyptus (Eucalyptus sp.) plantation ecosystems in Luocheng county, Guangxi Province were studied. The results show that the carbon content (percent of dry weight) of the understory layer in all plantations at different ages ranged from 37.96%-49.03%, while the content in the litter ranged from 41.8%-49.6%. When considering the understory carbon content of all plantations, the highest value occurred in the understory vegetation of the sappling Masson pine plantation, and the litter in the 2 yr-old eucalyptus plantation displayed the lowest value. The carbon content of soil from 0-60 cm depth ranged from0.45%-2.17%, In the 0-20 cm soil depth the carbon content ranged, from highest to lowest, as follows: Chinese Fir > Masson pine > eucalyptus. The total carbon storage of Masson pine, Chinese Fir and eucalyptus plantations are 135.61, 144.30, 87.54 t-hm-2 respectively. The carbon storage within the Masson pine and eucalyptus plantation increased with age. Carbon storage of sapping and near-mature Masson pine plantation was higher than what was found in sapping and near-mature Chinese fir plantation. However, the carbon storage in middle-aged Chinese fir plantations is greater than middle-aged Masson pine plantations. The carbon storage of tree layer of Masson pine, Chinese Fir and eucalyptus plantations accounted for 43.03%, 34.44%, 22.92% of the entire stored carbon within each of the respective ecosystems respectively. The carbon stored in the understory of Masson pine, Chinese fir and eucalyptus plantations was determined to be, in order of highest to lowest value, as: eucalyptus (2.54 t·hm-2) > Chinese Fir (1.91 t·hm-2) > Masson pine (0.89 t·hm-2 ) . The carbon stored in the litter of Masson pine, Chinese fir and eucalyptus plantations accounted forl.64%, 4.56%, 1.95% of the total carbon stored in these ecosystem respectively. The carbon stored in the soil of Masson pine, Chinese Fir and eucalyptus plantations within the 0-60 cm depth are 54.06, 67.33, 41.22 t·hm-2 respectively. The 0-20 cm layer of soil was found to contribute the most to the total soil carbon storage. The carbon stored within this upper 20 cm soil layer accounted for 47.03%, 51.67%, and 42.58% of the total soil carbon stored in Masson pine, Chinese fir, and eucalyptus plantations, respectively. The carbon stored in the tree layer and soil combined accounted for the majority of the carbon stored within these three plantation systems, where as the carbon stored in the understory and litter contributed the least to the total carbon stock.%对广西罗城仫佬族自治县杉木(Cunninghamia lanceolata)、马尾松(Pinus massoniana)桉树(Eucalyptus grandis x E.urophylla)人工林生态系统碳含量、碳储量进行了研究,结果表明:不同发育阶段马尾松、杉木、桉树人工林林下植被含碳率变化幅度为37.96%~49.03%,枯落物含碳率为41.8%~ 49.6%之间,马尾松幼龄林林下植被含碳率最高,2年生桉树林枯落物含碳率最小.0~60 cm土层含碳率变化幅度为0.45%~ 2.17%,0~20 cm土层含碳率表现为杉木>马尾松>桉树.马尾松、杉木、桉树人工林生态系统碳储量分别为135.61、144.30、87.54 t·hm-2,马尾松和桉树人工林生态系统碳储量均表现为随林龄的增加而增加,马尾松幼龄和近熟林碳储量分别高于杉木,杉木中龄林碳储量高于马尾松中龄林.马尾松、杉木、桉树人工林乔木碳储量分别占其总碳储量的43.03%、34.44%、22.92%.马尾松、杉木、桉树人工林下植被碳储量表现为桉树(2.54t·hm-2)>杉木( 1.91 t·hm-2)>马尾松(0.89 t·hm-2).马尾松、杉木、桉树人工林枯落物碳储量分别占其总碳储量的1.64%、4.56%、1.95%.马尾松、杉木、桉树人工林土壤碳储量分别为74.13、86.48、62.95 t·hm-2,杉木人工林土壤碳储量最高,桉树最小,0~20 cm土层碳储量成为土壤的主体,马尾松0~20 cm土层碳储量占其土壤总碳储量的47.03%,杉木占51.67%,桉树为42.58%.乔木和土壤碳储量成为整个森林生态系统的主要的碳储存库.