广西罗城不同林龄杉木人工林碳储量的变化趋势

Carbon Storage Changing Trends of China Fir Plantation of Different Ages in Luocheng,Guangxi

通过样地调查和实验室材料分析,广西罗城杉木人工林中龄林、近熟林、成熟林和过熟林生态系统碳储量的动态变化表现为:杉木人工林生态系统总碳储量表现为过熟林(196.07t.hm-2)>成熟林(156.28t.hm-2)>中龄林(150.09t.hm-2)>近熟林(147.68t.hm-2)。乔木碳储量占其总碳储量的33.33%-44.6%,表现出随着林龄的增加而增长,中龄林、近熟林、成熟林和过熟林林下植被碳储量在1. 19-3. 14t. hm-2范围,枯落物为3. 49-16.04t.hm-2。土壤碳储量表现为过熟林>成熟林>中龄林>近熟林。杉木人工林生态系统碳储量为162. 52t.hm-2,土壤碳储量最大(91.1t.hm-2),占总碳储量的56.1%,其次为乔木层,占总碳储量的38.2%,林下植被和枯落物层只占1.27%和4.49%,中龄林、成熟林和过熟林生态系统总碳储量以及其土壤和乔木碳库均表现为依林龄的增长而增加的趋势。

The dynamic changes of carbon storage in the ecosystems of middle-aged, near-mature, mature and over-mature China fir plantations in Luocheng, Guangxi were studied by sample plot investigation and laboratory material analysis. It is shown： the total carbon storage in the ecosystems of China fir plantations was over-mature （ 196.07 t. hm^-2 ） 〉mature （ 156.28 t. hm^-2 ） 〉 middle-aged. Forest （150.09 t. hm^-2） 〉near mature forest （147.68 t. hm^-2）. Carbon storage of arbor accounted for 33.33- 44. 6% of total carbon storage, showing an increase with forest age. Carbon storage of vegetation under middle-aged, near-mature, mature and over-mature forests ranged from 1.19 to 3.14 t. hm^-2, and litter was 3.49-16.04 t. hm^-2. Soil carbon storage was characterized by over mature forest〉mature forest〉middle aged forest〉near mature forest. Carbon storage of China fir plantation ecosystem was 162.52 t. hm^-2, soil carbon storage was the largest （91.1 t. hm^-2）, accounting for 56.1% of total carbon storage, followed by arbor layer, accounting for 38.2% of total carbon storage, understory vegetation and litter layer accounted for only 1.27% and 4.49%, middle-aged forest,mature forest and over-mature forest ecosystem carbon storage and soil and arbor. The carbon pool showed a trend of increasing with age.