Knowledge Resource Center for Ecological Environment in Arid Area
| 新疆天山中段不同草地类型地下有机碳分析 | |
| 其他题名 | The analysis of underground organic carbon under different grassland types in the Central Tien-Shan |
| 杨秀娟 | |
| 出版年 | 2013 |
| 学位类型 | 硕士 |
| 导师 | 胡玉昆 |
| 学位授予单位 | 中国科学院大学 |
| 中文摘要 | 新疆草地面积5725.88×104 hm2, 在全国位于第三位。草地在该区的自然生态系统中起着举足轻重的作用。天山山系是亚洲中部最大的山系，天山发育着亚洲中部山地最典型最完整的草地垂直带系。因此，研究天山的不同植被带下的地下有机碳有助于了解中亚地区山地地下有机碳的分布规律，了解土壤有机碳的垂直分布特征有助于预测气候变化或者土地利用变化带来的生态后果。 本文采用野外调查和室内分析结合的方法研究了天山中段六种草地类型地下有机碳含量特征。结果表明：（1）不同草地类型土壤有机碳存在着差异：山地草甸类草地>高寒草甸类草地> 温性草甸草原类草地>温性草原类草地> 温性荒漠草原类草地>温性荒漠类草地。在垂直剖面上，各个草地类型土壤有机碳含量都随着土层深度的增加而表现出降低的趋势，并存在着明显的分层特征。土壤有机碳含量与植被地上生物量表现出显著的正线性相关性。地上生物量高，则土壤有机碳含量高。与土壤容重、土壤pH值表现出负线性相关性。 （2）土壤有机碳密度表现出：山地草甸类草地>温性草甸草原类草地>高寒草甸类草地>温性草原类草地>温性荒漠草原类草地>温性荒漠类草地。剖面土壤有机碳密度对0-5cm土壤有机碳密度依赖较高。土壤有机碳储量主要分配在浅表层（0-40cm）。6种类型草地0-40cm的有机碳储量占1m深度土壤总有机碳储量的范围为50.91%-67.16%。山地草甸类草地的土壤有机碳分布相对较为均匀，而高寒草甸类草地的土壤有机碳主要分布在浅表层（0-40cm）。土壤有机碳密度与海拔有一定的相关关系（P＜0.05），随着海拔的升高，土壤有机碳密度逐渐增加。表层土壤有机碳密度的增幅与整体剖面有机碳密度的增幅一致。 （3）6种草地类型的根系生物量碳表现为：高寒草甸类草地> 温性草甸草原类草地>山地草甸类草地>温性草原类草地> 温性荒漠草原类草地>温性荒漠类草地。根系生物量随土层深度的增加而减小。 |
| 英文摘要 | Grassland in Xinjiang cover an area of 5725.88×104 hm2, grassland area is ranked third in the nation. Tien-Shan Mountains is the largest mountain ranges of Central Asia, Tien-Shan development the most typical and most complete grass vertical band system of Central Asian Mountain. The research on distribution characteristics of organic carbon plays a key role in determining the responses of China’s grasslands to global change. Therefore, research the underground organic carbon under different vegetation in Tien-Shan mountain will contributes to an understanding of the distribution of organic carbon and this will help predict the ecological consequences of climate change or land use change. The content characters of organic carbon underground of six grassland in Tien-Shan Mountain were studied with field investigation and laboratorial analysis. The results indicated that: (1) There is significant difference between different types of grassland on soil organic carbon content, holding the order as below: Mountain meadow grassland> Alpine meadow grassland> Temperate meadow steppe grasslands> temperate steppe> Temperate desert steppe grasslands> The temperate desert grassland. In the vertical profile, the SOC shows the trend of the lower all along with the increase of soil depth in various types of grassland, and there are obviously layered characteristics. Soil organic carbon content and vegetation aboveground biomass showed a significant positive linear correlation, with higher ground biomass, there is higher soil organic carbon content. Soil organic carbon content and soil bulk density, soil pH value showed a negative linear correlation. (2)Soil organic carbon density holding the order as below: Mountain meadow grassland > Temperate meadow steppe grasslands > Alpine meadow grassland > temperate steppe > Temperate desert steppe grasslands > The temperate desert grassland. The soil organic carbon density of profile dependence the soil organic carbon density of 0-5cm. Soil organic carbon distribution in play (0-40cm). 0-40cm soil organic carbon accounted for 1 m depth of total organic carbon in the range of 50.91% to 67.16%. Mountain meadow grassland soil organic carbon distribution is relatively uniform, Alpine meadow grassland soil organic carbons are mainly distributed in the play (0-40cm). Soil organic carbon density is associated with elevation (P<0.05).With the increase of altitude, Soil organic carbon density increased. Surface soil organic carbon density increase in line with the overall profile of organic carbon density. (3)Root biomass carbon holding the order as below: Alpine meadow grassland> Temperate meadow steppe grasslands > Mountain meadow grassland > temperate steppe> Temperate desert steppe grasslands > The temperate desert grassland. Root biomass decreases with the increase of soil depth. |
| 中文关键词 | 土壤有机碳 ; 根系生物量 ; 碳库 ; 天山 |
| 英文关键词 | Soil organic carbon root biomass Carbon pool Tien-Shan |
| 语种 | 中文 |
| 国家 | 中国 |
| 来源学科分类 | 生态学 |
| 来源机构 | 中国科学院新疆生态与地理研究所 |
| 资源类型 | 学位论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/287292 |
| 推荐引用方式 GB/T 7714 | 杨秀娟. 新疆天山中段不同草地类型地下有机碳分析[D]. 中国科学院大学,2013. |
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