湖南会同不同退耕还林模式初期碳密度、碳贮量及其空间分布特征  

Carbon density,storage and spatial distribution under different ‘Grain for Green’patterns in Huitong,Hunan Province

作　　者：田大伦[1,2,3] 尹刚强[1,4] 方晰[1,2,3] 项文化[1,2,3] 闫文德[1,2,3] 

机构地区：[1]中南林业科技大学生态研究室,长沙410004 [2]南方林业生态应用技术国家工程实验室,长沙410004 [3]国家野外科学观测研究站,会同418307 [4]国家林业局,北京100714

出　　处：《生态学报》2010年第22期6297-6308,共12页Acta Ecologica Sinica

基　　金：科技部公益性研究项目(2007415);国家野外科学观测研究站项目(20060515;20070822);国家林业局软科学项目(2007R23)

摘　　要：对湖南会同5种退耕还林模式初期森林生态系统碳密度、碳贮量及其空间分布特征进行了研究。结果表明:主要造林树种马尾松、樟树、杜英、乐昌含笑、红花木莲不同器官的平均碳密度分别为:0.5296、0.5188、0.5178、0.5376、0.5355gC/g,树种间同一器官的平均碳密度排序为:树干>树根>树叶>树枝>树皮;5种退耕还林模式中活地被物层、死地被物层碳密度分别介于0.4380—0.5380gC/g、0.5060—0.5200gC/g之间,土壤层(0—60cm,下同)平均有机碳密度介于0.00786—0.01485gC/g之间;退耕还林3a后,乐昌含笑×红花木莲混交林、杜英×乐昌含笑混交林、杜英×樟树混交林、樟树林土壤层有机碳密度比原坡耕地分别提高了53.57%、39.19%、38.57%、24.82%,而马尾松林地下降了18.72%。林木不同器官中的碳贮量基本上与各器官的生物量成正比例,同一造林时间的4种模式中,以杜英×樟树混交林各器官的碳贮量最大,为1.219tC/hm2,杜英×乐昌含笑混交林最小,仅为0.199tC/hm2,均以干根碳贮量为最大,占其各器官碳贮量的57.50%以上。5种退耕还林模式恢复初期的生态系统中,土壤层碳贮量最大,为74.518—119.312tC/hm2,占96.180%以上,植被层为其次,在0.633—2.960tC/hm2之间,仅占0.642%—3.820%,死地被物层为最小。退耕后,樟树林、杜英×樟树混交林、乐昌含笑×红花木莲混交林、杜英×乐昌含笑混交林生态系统碳贮量分别增加了19.477、27.722、41.643、26.821tC/hm2,马尾松林下降了1.675tC/hm2。Carbon density, storage and spatial distribution in young stands within five afforestation patterns following the ＇ Grain for Green＇ program （ GGP, i. e. , conversion of farmland to florets） were investigated in Huitong County, Hunan Province. The five afforestation patterns included Pinus massoniana pure forests, Cinnamomum camphora pure forests, Michelia chapensis and Manglietia insignis mixed forests, Elaeocarpus sylvestris and Michelia chapensis mixed forests, and Elaeocarpus sylvestris and Cinnamomum camphora mixed forests. The results showed that the mean carbon densities of all organs were 0. 5296, 0. 5188, 0. 5178, 0. 5376, and 0. 5355 gC/g for the tree species Pinus rnassoniana, Cinnarnomum camphora, Elaeocarpus sylvestris, Michelia chapensis, and Manglietia insignis, respectively. The average carbon densities in different organs of the five tree species ranked in the order as： trunk 〉 root 〉 leaf 〉 branch 〉 bark. Carbon densities ranged from 0. 4380 to 0. 5380gC/g, 0. 5060 to0. 5200gC/g litterfall layer and soil layer （0 --60 cm depth） , respectively and 0. 00786 to 0. 01485 gC/g in living-understory layer, within the five afforestation patterns. Three years later after the conversion of farmland to forests, soil organic carbon density was increased 53.6%, 39.2%, 38.6%, and 24. 8% in Michelia chapensis and Manglietia insignis mixed forests, Elaeocarpus sylvestris and Michelia chapensis mixed forests, Elaeocarpus sylvestris and Cinnamomum camphora mixed forests and Cinnamomum camphora forests, but decreased 18.7% in Pinus massoniana forest when compared with pre-converted farmland. Carbon storage in different organs was positively related to the biomass of these respective organs. It was found that Elaeocarpus sylvestris and Cinnamomum camphora mixed forest had the highest carbon stocks in the tree biomass pools （ 1.22 tC/hm^2 ）, while Elaeocarpus sylvestris and Michelia chapensis mixed forest had the lowest value （0. 20 tC/hm^2）. Trunk and root stored more carbon than other

关 键 词：湖南会同 退耕还林 碳密度 碳贮量 

分 类 号：S718.5[农业科学—林学]