| 摘要: |
| 【目的】比较宁夏隆德县3种灌木林生态系统的固碳能力，以便选择和发展固碳能力较强的灌木种。【方法】在宁夏隆德县退耕还林实施区，选择7年生沙棘（Hippophae rhamnoides）、柠条（Caragana korshinskii）和山毛桃（Prunus davidiana）灌木林，设置样地，测算灌木层、草本层的生物量，并取0～100 cm土层土样，测定不同土层土壤体积质量，计算灌木层、草本层和土壤层的碳密度，分析3种灌木林各组分及土壤碳密度的变化。【结果】沙棘、柠条、山毛桃灌木林生态系统碳密度分别为63.29，52.82和77.78 t/hm2，其碳密度的空间分布格局基本一致，即土壤层碳密度所占比例最大，分别为88.56%，87.79%和87.44%；其次为灌木层，所占比例分别为10.18%，11.25%和12.16%；草本层所占比例最小，分别为1.26%，0.97%和0.40%。在0～100 cm土层，土壤层碳密度随着土层深度的增加总体呈下降趋势，且山毛桃林土壤层碳密度（68.01 t/hm2）明显高于沙棘林（56.05 t/hm2）和柠条林（46.37 t/hm2）。【结论】与沙棘、柠条相比，山毛桃是一个固碳能力较强的灌木种，适度发展山毛桃在一定程度上有利于固定更多的碳。 |
| 关键词: 黄土丘陵区 灌木林 生物量 碳密度 碳分配 固碳能力 |
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| 基金项目:中国科学院战略性先导科技专项（XDA05060300）；国家自然科学基金面上项目（41271518）；黄土高原土壤侵蚀与旱地农业国家重点实验室基金项目（10501-1219） |
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| Comparison of carbon densities of three shrub plantation ecosystems in Hilly Loess Plateau |
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| Abstract: |
| 【Objective】Carbon sequestration ability of three shrub plantations was compared in Longde County,Ningxia,aiming at selecting and developing shrub with high carbon sequestration ability.【Method】Based on shrub layer biomass,herb layer biomass,soil samples from 0-100 cm layers of different plots,carbon densities and the variations of 7-year H.rhamnoides,C.korshinskii and P.davidiana shrub plantations in afforestation area of Longde country,Ningxia were quantified. 【Result】Total carbon densities of H.rhamnoides,C.korshinskii,and P.davidiana were 63.29,52.82 and 77.78 t/hm2,respectively.The distribution pattern of carbon stocks was basically consistent.Soil layer contributed to the majority of ecosystem carbon density,accounting for 88.56%,87.79% and 87.44% for the three ecosystems,followed by shrub layer,(10.18%,11.25% and 12.16%) and herb layer (1.26%, 0.97% and 0.40%).Within the 0-100 cm depth of soil layer,carbon density decreased as the increase of soil depth.P.davidiana stands had the highest oil layer carbon density (68.01 t/hm2) followed by H.rhamnoides stands (56.05 t/hm2) and C.korshinskii stands (46.37 t/hm2).【Conclusion】 Compared with H.rhamnoides stands and C.korshinskii stands,P.davidiana stands were better for carbon sequestration. |
| Key words: Hilly Loess Plateau shurb biomass carbon density carbon distribution carbon sequestration |
