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为研究林龄对刺槐林生态系统碳储量的影响,在样地调查与实测生物量的基础上,对河南省洛宁县灌木林人工改造的8、15和22年生刺槐人工林进行了研究,测定了刺槐林及同区域灌木林不同层次的的碳含量(乔木层、灌草层、枯落物层和土壤层(0~50 cm)),结合生物量及土壤数据分析其生态系统的碳储量和层次分布特征。结果表明,刺槐各器官碳含量在42.60%~50.92%之间,大小顺序为:树干>树皮>树枝>根桩>树叶>粗根>小根>大根>中根>细根;各林分的灌草层、枯落物层碳含量无显著差异;土壤层碳含量均表现为随土壤深度增加而降低,而随着种植年限的增加而增加;灌木林及8、15和22年生刺槐人工林生态系统碳储量分别为78.96、99.78、110.85和132.75 t·hm-2,对比灌木林,8、15和22年生刺槐林碳储量年均增长量分别为2.60、2.13和2.44 t·hm-2·a-1;乔木层及土壤层是刺槐人工林生态系统碳储量的主要来源,两者占生态系统碳储量85.14%~96.63%。随种植年限增加刺槐林土壤层碳储量所占比重下降而乔木层碳储量比重逐渐上升,灌草层、枯落物层碳储量无明显变化规律。
In order to study the effect of stand age on the carbon storage in the ecosystem of Robinia pseudoacacia, 8,15 and 22-year-old Robinia pseudoacacia plantations that were manually reformed in shrub forest of Luoning County, Henan Province were studied on the basis of sample survey and measured biomass. The carbon content (tree layer, shrub layer, litter layer and soil layer (0 ~ 50 cm)) of Robinia pseudoacacia forest and the shrubs in the same area were analyzed. The carbon storage of the ecosystem was analyzed based on biomass and soil data And hierarchical distribution characteristics. The results showed that the carbon contents of organs of R. pseudoacacia ranged from 42.60% to 50.92%, with the order of trunk> bark> branch> root post> leaf> coarse root> small root> large root> middle root> fine root; The carbon content of shrub layer and litter layer had no significant difference. The carbon content of soil layer decreased with the increase of soil depth, but increased with the increase of planting time. The shrub forest and the 8, 15 and 22 year old Robinia pseudoacacia plantation The carbon storage of ecosystems was 78.96, 99.78, 110.85 and 132.75 t · hm-2, respectively. The average annual growth of carbon stocks in 8, 15 and 22 year old Robinia pseudoacacia forests was 2.60, 2.13 and 2.44 t · hm-2 · a-1. The arbor layer and soil layer are the main sources of carbon storage in Robinia pseudoacacia plantation ecosystems, accounting for 85.14% ~ 96.63% of the total ecosystem carbon stock. The proportion of carbon storage in the soil layer of Robinia pseudoacacia forest decreased with planting years, while the proportion of carbon storage in tree layer increased gradually. There was no obvious change of carbon storage in shrub layer and litter layer.