Knowledge Resource Center for Ecological Environment in Arid Area
| 荒漠化对毛乌素沙地土壤呼吸及生态系统碳固持的影响 | |
| 丁金枝 | |
| 出版年 | 2010 |
| 学位类型 | 硕士 |
| 导师 | 郑元润 |
| 学位授予单位 | 中国科学院大学 |
| 中文摘要 | 土地荒漠化对干旱、半干旱区土壤呼吸及碳固持的影响巨大，在调控区域及全球尺度的碳循环中起着十分关键的作用。以毛乌素沙地固定沙地本氏针茅群落（FS）、固定沙地油蒿群落（FA）、半固定沙地油蒿群落（SFA）、流动沙地一年生植物群落（AL）等4个代表毛乌素沙地荒漠化主要阶段的植物群落为研究对象，采用LI-8100 土壤碳通量测量系统测定了其土壤呼吸速率的日动态和月动态，结合植物群落生产力的野外观察，分析了荒漠化对土壤呼吸速率及碳固持的影响。结果表明：（1）5月到9月主要生长季内，FS、FA、SFA、AL的平均土壤呼吸速率分别为2.48、2.12、1.16、0.37 μmol·m-2·s-1，Q10值依次为5.87、5.05、4.02、0.64；（2）影响各植物群落土壤呼吸日动态的主要因子为土壤温度；在不同荒漠化阶段，影响土壤呼吸速率的主要因子不同，土壤湿度是影响固定沙地植物群落土壤呼吸月变化的主要因子，而半固定沙地和流动沙地植物群落土壤呼吸与根系生物量的关系更为密切；（3）随着荒漠化程度的加重，生态系统的碳固持能力逐渐降低。因此，采取合理措施使荒漠化土地向以油蒿或本氏针茅为主的固定沙地演替，是提高毛乌素沙地生态系统碳固持能力的主要途径。 |
| 英文摘要 | Abstract: Desertification greatly affected the soil respiration and carbon fixation in arid and semi-arid environments; it plays a key role in meditating carbon circulation in a regional or global scale. Stipa bungeana community in fixed dune (FS), Artemisia ordosica community in fixed dune (FA), Artemisia ordosica community in semi-fixed dune (SFA) and active dune (AL) that represent main desertification stages in Mu Us sandy land were chosen to measure diurnal and monthly dynamics of soil respiration using LI-8100 Automated Soil CO2 Flux System, combined with filed observation on net primary productivity, the effect of desertification on soil respiration and carbon fixation was investigated. The results showed that: (1) in main growing season from May to September, the mean soil respiration rate for FS, FA, SFA, AL were 2.48、2.12、1.16、0.37 μmol·m-2·s-1, Q10 were 5.87, 5.05, 4.02, 0.64 respectively; (2) The main factor that affected diurnal dynamics of soil respiration rate was soil temperature; the main factor that affected soil respiration was different in different desertification stages. Soil moisture greatly affected monthly soil respiration for plant community in fixed dune, while root biomass greatly affected soil respiration rate for plant community in semi-fixed and active dune; (3) From May to September, for different community types, FS, FA, SFA and AL, aboveground productivity were 88.66g/m2、162.72g/m2、65.39g/m2 and 10.37 g/m2，belowground productivity were 314.33g/m2、82.27g/m2、18.00g/m2 and 0.30 g/m2 respectively. ANOVA indicated aboveground productivity decreased significantly with increasing desertification, i.e. FA ＞FS，SFA ＞AL; the fine root biomass decreased along desertification gradients, FS>FA>SFA>AL; (4) From May to September, net ecosystem productivity (NEP) of fixed dune was positive (33.22 C g/ m2 for FS，10.96 C g/ m2 for FA), while NEP of semi-fixed and active dune were negative (-9.76 C g/ m2 for SF，-22.15 C g/ m2 for AL). With increasing desertification, the ability of carbon fixation of ecosystem decreased. Therefore, to make plant community succession into Stipa bungeana community or Artemisia ordosica community in fixed dune would be the effective way to increase carbon fixation ability in Mu Us Sandy land.\n \n \n \n\n\nKey words： Mu Us Sandy land; desertification; soil respiration; carbon fixation |
| 中文关键词 | 毛乌素沙地 ; 荒漠化 ; 土壤呼吸 ; 碳固持 |
| 语种 | 中文 |
| 国家 | 中国 |
| 来源学科分类 | 生态学 |
| 来源机构 | 中国科学院植物研究所 |
| 资源类型 | 学位论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/286897 |
| 推荐引用方式 GB/T 7714 | 丁金枝. 荒漠化对毛乌素沙地土壤呼吸及生态系统碳固持的影响[D]. 中国科学院大学,2010. |
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