广西罗城马尾松、杉木、桉树人工林碳储量及其动态变化

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（2.54 t.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。

Carbon storage and distribution of massion pine, Chinese fir and eucalyptus plantations at Liuzhou, Guangxi province

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 occur...