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作 者:杨路存[1,2] 李长斌[1,3] 宁祎[1,3] 聂秀青[1,3] 徐文华[1,2] 周国英[1,2]
机构地区:[1]中国科学院西北高原生物研究所,西宁810008 [2]中国科学院藏药研究重点实验室,西宁810008 [3]中国科学院大学,北京100049
出 处:《植物生态学报》2017年第1期62-70,共9页Chinese Journal of Plant Ecology
基 金:中国科学院战略性先导科技专项(XDA-0505030304);科技基础性工作专项(2015FY1103-0001);国家科技支撑计划项目(2014BAC05B01)
摘 要:灌丛面积增加引起的碳储量增加被认为是我国陆地生态系统碳储量增加的重要原因,也是陆地生态系统碳汇研究中的一个不确定因素。为了揭示高寒灌丛的碳密度及其分配格局,该文对青海省不同样地8个金露梅(Potentilla fruticosa)灌丛生态系统各组分的碳密度及分布特征进行了研究。结果表明:金露梅灌丛的生物碳密度、凋落物碳密度、土壤有机碳密度和总碳密度分别为:5 088.54、542.1、35 903.76和41 534.4 kg·hm^(–2)。金露梅灌丛灌木层碳主要分配在根部(49.5%–56.1%),灌木层碳密度占总生物量碳密度的68%以上。草本层碳也主要分配在根部(59.6%–75.1%),草本层碳密度占总生物量碳密度的22.5%。金露梅灌丛的生物碳密度明显低于中国6种主要灌丛的平均值(10.88 t·hm^(–2))。在金露梅灌丛中,土壤碳密度占有最大比例,约占总碳密度的86.4%。Aims Shrub recovery is recognized as an important cause of the increase of carbon stocks in China, and yet there are great uncertainties in the carbon sink capacities of shrubs. Our objectives were to estimate carbon density and its spatial distribution in alpine shrubs. Methods Eight sites in Potentilla fruticosa dominated shrublands across Qinghai, China were investigated. Plant biomass and carbon content in leaves, branches and stems, and roots were measured to analyze the biomass allocation and carbon density. Important findings Mean carbon densities in biological carbon, litter, soil and whole ecosystem of P. fruticosa shrublands were 5 088.54, 542.1, 35 903.76 and 41 534.4 kg·hm^–2, respectively. Carbon density in the shrub layer was more than 68% of the biological carbon density of the whole ecosystem and was mainly distributed in roots (49.5%–56.1%). Carbon density of the herbaceous layer was 22.5% of the biological carbon density of the whole ecosystem and was also mainly distributed in roots (59.6%–75.1%). The biological carbon density of P. fruticosa shrublands (5.08 t·hm^–2) was lower than the average carbon density of shrub communities in China (10. 88 t·hm^–2). Soil carbon density contributed the largest proportion (85.8%) of total carbon density in P. fruticosa shrublands.
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