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经营模式对毛竹林生物量、碳贮量具有重要影响。研究了湘中丘陵区毛竹笋用林(Ⅰ)、笋材兼用林(Ⅱ)和材用林(Ⅲ)3种不同经营目标下的竹林年龄结构、生物量分配及碳贮量格局。结果表明:应减少1～2a、增加5～6a生竹的留养比例,控制达到1～2a、3～4a、5～6a各占1/3左右的立竹年龄结构。不同层次生物量表现为乔木层>凋落物层>林下植被层,毛竹笋用林经营有利于增加乔木层生物量。乔木层生物量及所占比例分别为51.83～55.66t/hm2、88.95%～92.93%,林下植被层生物量及所占比例分别为1.54～2.58t/hm2、2.58%～4.43%,凋落物层生物量及所占比例分别为2.69～3.86t/hm2、4.49%～6.62%。毛竹林总碳贮量排队顺序为Ⅱ(142.63t/hm2)>Ⅰ(133.89t/hm2)>Ⅲ(130.04t/hm2),笋材兼用林有利于提高竹林碳贮能力。不同层次碳贮量排列顺序总体均表现为土壤层>乔木层>凋落物层>林下植被层。湘中丘陵区毛竹林生物量、碳贮量较低,应提高集约经营水平。
Management mode of bamboo forest biomass, carbon storage has an important impact. The bamboo age structure, biomass allocation and carbon storage of bamboo forest were studied in three different management objectives of bamboo forest (Ⅰ), bamboo forest (Ⅱ) and timber forest (Ⅲ) in hilly area of Central Hunan Province. The results showed that the proportion of standing bamboo should be reduced by 1 ~ 2a and 5 ~ 6a, and the age structure of standing bamboo about 1 / 2a, 3 ~ 4a and 5 ~ 6a should be controlled. The biomass of different layers showed arbor layer> litter layer> understory vegetation layer, and management of bamboo shoots was helpful for increasing biomass of arbor layer. The biomass and proportion of arborous layer were 51.83 ~ 55.66t / hm2 and 88.95% ~ 92.93%, respectively. The biomass and proportion of understory vegetation layer were 1.54 ~ 2.58t / hm2, 2.58% ~ 4.43%, litter The biomass and proportion of layer were 2.69 ~ 3.86 t / hm2, 4.49% ~ 6.62% respectively. The order of total carbon storage in Moso bamboo forest was (142.63t / hm2)> I (133.89t / hm2)> Ⅲ (130.04t / hm2). The sequence of carbon storage at different levels generally showed as follows: soil layer> arbor layer> litter layer> undergrowth vegetation layer. The biomass and carbon storage of Phyllostachys pubescens forest in the hilly area of Central Hunan Province should be low, and the intensive management should be improved.