Knowledge Resource Center for Ecological Environment in Arid Area
| 内蒙古草原土壤团聚体有机碳的分配及其影响因素 | |
| 其他题名 | Distribution of organic carbon in soil aggregates and its influencing factors in Inner Mongolian grasslands |
| 王甜 | |
| 出版年 | 2018 |
| 学位类型 | 硕士 |
| 导师 | 方精云 ; 胡会峰 |
| 学位授予单位 | 中国科学院大学 |
| 中文摘要 | 土壤有机碳库是陆地生态系统中的最大碳库，在全球碳循环中起着重要作用。土壤团聚体是指土壤颗粒通过各种自然过程的凝胶作用而形成的直径小于10 mm的基本结构单元，对土壤有机碳具有重要的物理保护作用。土壤团聚体的研究近年来得到了广泛的关注，但主要集中在热带森林、亚热带森林和农田生态系统，对草原生态系统，尤其是区域尺度的研究较为缺乏。因此，探讨土壤团聚体形成及稳定性的分布格局对于理解草原生态系统土壤有机碳库稳定性具有重要的意义。本研究采集内蒙古草原78个样地的土壤样品，利用湿筛法将土壤团聚体分级为<53 μm、53–250 μm、250–2000 μm和>2000 μm四种粒级团聚体组分。利用双因素方差分析检验草原类型和土层深度对土壤团聚体质量百分比和土壤团聚体有机碳含量分配的影响。利用多重比较分析检验三种草原类型（草甸草原、典型草原、荒漠草原）中土壤团聚体稳定性垂直分布的差异。此外，本研究还利用了线性回归方法，分析土壤团聚体有机碳含量的影响因子。研究发现，土壤团聚体含量及其有机碳含量在草甸草原中最高（P<0.05），而在典型草原和荒漠草原中差异不显著（P>0.05）。双因素方差分析结果显示：草原类型对土壤团聚体含量及其有机碳含量均有极显著的影响（P<0.01），土层深度仅对团聚体有机碳含量有显著影响（P<0.01）。三种草原中土壤团聚体稳定性的垂直分布格局有所差异：草甸草原与典型草原土壤团聚体的稳定性随着土层深度逐渐降低（P<0.05），而荒漠草原并无明显的变化（P>0.05）。在0-10 cm和10-20 cm土层中，草甸草原土壤团聚体的稳定性显著高于典型草原和荒漠草原（P<0.01）；20-100 cm中，3种草原土壤团聚体的稳定性没有显著差异（P>0.05）。土壤总有机碳含量随着土壤团聚体有机碳含量增加而增加（R2=0.92，P<0.001）。三种草原中，土壤团聚体有机碳含量占土壤总有机碳含量的比例均高于70%，且方差分析结果表明三种草原之间都无显著的差异（P>0.05）。进一步地，通过分析生物和非生物因子与土壤团聚体有机碳含量之间的关系发现：在0-70 cm土层中，年平均温度和土壤pH与有机碳含量显著负相关（P<0.001）；在每一土层，年平均降水量、地上生物量、微生物生物量碳和平均重量直径与土壤团聚体有机碳含量之间均显著正相关（P<0.001）。 |
| 英文摘要 | Soil organic carbon (SOC) is the largest organic carbon pool in the terrestrial ecosystems, and plays an important role in the cycle of carbon. Soil aggregates are the basic soil structural units formed by the soil particles through natural processes, and the diameter is less than 10 mm. Soil aggregates have a protective effect on the SOC by physical processes. The researches of soil aggregates have drawn wide attention in recent years, but they are mainly limited in tropical forests, subtropical forests and agricultural ecosystem. The study on soil aggregates in grassland ecosystems is extremely lacking, especially at the regional scale. For the better understanding of the stability of organic carbon (OC) pool in grassland ecosystem, it is important to explore the distribution pattern of the formation and stability of soil aggregates.In this study, we have established 78 sites across the transect of Inner Mongolian grasslands. Wet sieving method was used to separate soil aggregates by four groups (including <53 μm, 53–250 μm, 250–2000 μm and >2000 μm group). The two-way ANOVA was applied to analyze the difference of mass percentage and the OC content of soil aggregates in different grassland types and soil depths. In addition, the difference of soil aggregates stability among different grassland types and soil depths were analyzed by making multiple comparisons. The relationship between the OC content of soil aggregates and its determines were analyzed by linear regression models.The results showed that the percentage of soil aggregates and the OC content of soil aggregates were both highest in the meadow steppe(P<0.05), while no significant difference was found between the typical steppe and the desert steppe(P>0.05). Two-way ANOVA showed that the grassland types had a significant effect on both the percentage of aggregates and the OC content of aggregates(P<0.01). The soil depth also has significant effects on the distribution of OC of aggregates(P<0.01). The stability of soil aggregates decreased with the depth(P<0.05) in meadow steppe and typical steppe, while no significant vertical pattern was detected in the desert steppe(P>0.05). Further, the stability of soil aggregates in the meadow steppe is significantly higher than those in the typical steppe and the desert steppe in the surface soil layers (0-10 and 10-20 cm), while no significant difference was found in deep soil layers (20-100cm). The OC content associated with soil aggregates increased with bulk soil OC content in all depths(R2=0.92, P<0.001). The OC content of soil aggregates is 70% higher than OC content of the bulk soil, and the variance analysis shows that there were no significant difference between the three types of grassland(P>0.05).By exploring the relationships between abiotic, biotic factors and the OC of soil aggregates, negative relationships between the OC content of soil aggregates and mean annual temperature, and soil pH were found in all soil layers(P<0.001) except 70-100 cm(P<0.001). In contrast, the correlation between the OC content of soil aggregates and mean annual temperature, aboveground biomass, microbial biomass carbon, and mean weight diameter was found to be positive in all soil layers(P<0.001). |
| 中文关键词 | 草原类型 ; 土壤团聚体 ; 土层深度 ; 有机碳 |
| 英文关键词 | Grassland Types Soil Aggregates Soil Depths Organic Carbon Content |
| 语种 | 中文 |
| 国家 | 中国 |
| 来源学科分类 | 生物工程 |
| 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/2XILL650/288211 |
| 推荐引用方式 GB/T 7714 | 王甜. 内蒙古草原土壤团聚体有机碳的分配及其影响因素[D]. 中国科学院大学,2018. |
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