杉木和桉树人工林土壤碳储量的比较

The Comparative Study on Soil Carbon Storage of Chinese Fir and Eucalyptus Plantations

采用野外调查取样和实验分析等方法,对广西罗城杉木(Cunninghamia lanceolata)和桉树(Eucalyptus sp.)人工林土壤碳储量进行了研究,结果表明:杉木和桉树人工林土壤含碳率变化幅度为0.45%~2.17%,杉木林土壤含碳率高于桉树林。杉木和桉树0~20 cm土层的土壤碳储量分别为44.68 t.hm^-2和26.8 t.hm^-2,分别占其土壤总碳储量的51.67%和42.57%,成为土壤碳储量的主要碳库。杉木和桉树人工林土壤的含碳率和碳储量均表现出随着土壤深度的增加而减少,杉木人工林土壤碳储量(86.48 t.hm^-2)高于桉树林(62.95 t.hm^-2)。桉树人工林各林龄和杉木幼龄林、中龄林、成熟林到过熟林的土壤碳储量均表现为随着林龄的增加而增长的趋势。

By using the research method of field investigation and laboratory analysis,the soil carbon storage in Chinese fir and eucalyptus plantation were studied at Luocheng,Guangxi.The results showed that the soil carbon content(percent of dry weight)in all plantations at different ages ranged from 0.45~2.17%,and the soil carbon content of Chinese fir is higher than eucalyptus.The soil carbon stocks with 0~20 cm depth were 44.68 t.hm^-2,26.8 t.hm^-2 and accounted for 51.67%,42.57% of total soil carbon stocks respectively in Chinese fir and eucalyptus plantation,which accounted for the majority of the total soil carbon.The soil carbon content and carbon storage both decrease with with the increase of soil depth in Chinese fir and eucalyptus plantation,and the carbon storage stored in Chinese fir plantation(86.48 t.hm^-2)is higher than eucalyptus plantation(62.9 t.hm^-2).The soil carbon storage stored in eucalyptus and Chinese fir plantation except pre-mature plantation increase with ages.