古尔班通古特沙漠南缘梭梭群落水分来源
文献类型：学位论文
| 作者 | 傅思华 |
| 答辩日期 | 2017-05-01 |
| 文献子类 | 硕士 |
| 授予单位 | 中国科学院大学 |
| 授予地点 | 新疆乌鲁木齐 |
| 导师 | 杨涛 ; 胡顺军 |
| 关键词 | 古尔班通古特沙漠 梭梭 水分来源 同位素技术 Gurbantunggut Desert H.ammodendron water sources stable isotope |
| 学位专业 | 理学硕士 |
| 英文摘要 | Haloxylon ammodendron is a dominant plant species in the Gurbantünggüt Desert. The study of the water source of H. ammodendron community under natural conditions is helpful to understand the water consumption mechanism more deeply. And it’s also in favor of exploring the change of the water use pattern of H. ammodendron dynamic and adaptation strategies under the condition of the change of hydrological characteristics on the ecological process. Then, providing scientific basis for the study of the protection and restoration of plant diversity in arid area under the condition of climate change. To investigate the dynamics of water usage of these plants, we used the direct comparison method, Iso-Source model and the mean depth of water uptake model. The main results were as follows: （1）The water source characteristics of H. ammodendron H. ammodendron as one of the main species of the Gurbantunggut desert, the root system has the characteristics of "two states", and there are obvious seasonal differences in water use. During April to May, the main water source of Haloxylon ammodendron were shallow soil water, deep soil water and groundwater. As the temperature increased, because of the strong evaporation and plant water effect, shallow soil water moisture content decreased obviously, H. ammodendron mostly use of soil water soil depth gradually move down. During April to September, the average depth of H. ammodendron using soil water also moved along with the changing seasons.The growth and development of root system resulted in the difference of water use among H. ammodendron. The root system of young H. ammodendron was immature, so its root system was more active than middle-aged H. ammodendron and mature H.ammodendron, and the utilization of surface soil water was significantly lower than the later two. In June, the main water source of moddle-aged H. ammodendron was 250-350 cm layer soil water, the main water source of mature H. ammodendron was 180-250 cm layer soil water. From July to September, mature H. ammodendron was the most concentrated soil layer of soil water, followed by middle-aged, the most extensive range was young H. ammodendron. Deep soil water and groundwater have been the main source of water for mature H. ammodendron, and deep soil water is the main source of water for middle-aged and young H. ammodendron.（2）The water source characteristics of H. ammodendron community The main soil water of Erodium oxyrrhynchum, Sisymbrium polymorphum, Seriphidium santolinum and Suaeda glauca was 8-65 cm layer soil water, there were still some differences in soil water use, and the seasonal variation of soil water use of Seriphidium santolinum and Suaeda glauca was significant. In May, The main water source of Suaeda glauca grown in the space was concentrated in 0-10 cm soil layer, the average depth of soil water use was 8.43 cm. In August, the depth of soil water that used moved down, and the average depth of soil water utilization was 41.2 cm. On the ground, Seriphidium santolinum and Suaeda glauca mainly use the 20-40 cm soil layer, and the depth of soil respectively were 22.3 cm and 57.6 cm in May. In August, which make use of soil water depth increased, focused on 0-20 cm soil layer soil water, the average depth was 12.2 cm.H.ammodendron did not affect the water use characteristics of Sisymbrium polymorphum. The results showed that the soil moisture utilization of Erodium oxyrrhynchum and Seriphidium santolinum in May and Suaeda glauca in August were less affected by H. ammodendron. The soil water use of Suaeda glauca in May and Seriphidium santolinum in August greatly affected by H.ammodendron. Sisymbrium polymorphum, Seriphidium santolinum and Suaeda glauca under the canopy had a competition about soil moisture, while the plants in the space area had no competition. |
| 学科主题 | 自然地理学 |
| 语种 | 中文 |
| 源URL | [http://ir.xjlas.org/handle/365004/14871]  |
| 专题 | 新疆生态与地理研究所_研究系统_荒漠环境研究室 |
| 作者单位 | 中国科学院新疆生态与地理研究所 |
| 推荐引用方式 GB/T 7714 | 傅思华. 古尔班通古特沙漠南缘梭梭群落水分来源[D]. 新疆乌鲁木齐. 中国科学院大学. 2017. |
入库方式： OAI收割
来源：新疆生态与地理研究所
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