塔里木盆地南缘不同土壤盐分生境下骆驼刺适应特性研究
文献类型：学位论文
| 作者 | 罗瀚林 |
| 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 | 曾凡江 |
| 关键词 | 疏叶骆驼刺 极端干旱区 盐分生境 叶片性状 根系分株 Alhagi sparsifolia Shap. extremely arid areas saline habitats leaf trait root ramet |
| 学位专业 | 农学硕士 |
| 英文摘要 | Soil salinization is one of the top ten threats to soil function. It seriously restricts the development of agriculture and animal husbandry. Tarim Basin is favorable for the occurrence of soil salinization due to its unique natural environment. The unreasonable land use and the construction of water conservancy projects have further aggravated the expansion and spread of saline land, which caused the serious damage to the natural vegetation near the oasis. Alhagi sparsifolia Shap. is a key species grown on the southern margin of the Tarim Basin. It plays an important role in maintaining ecological security and promoting economic development in this region. Therefore, it is of great significance to study the adaptive characteristics of A. sparsifolia.In this study, the dominant plant A. sparsifolia was studied under different salt conditions in the southern margin of Tarim basin. Through the combination of field observation and experimental analysis, we systematically studied the growth distribution, leaf traits, root ramet, ion distribution characteristics of A. sparsifolia under different salt conditions. In order to reveal the ecological adaptation of A. sparsifolia to different salinity environment, and provide scientific basis for regional degradation vegetation restoration and saline land resource management. Mainly results are as follows:(1) Growth distribution characteristics: There was a significant correlation between total salt of soil, soil organic carbon content, soil total nitrogen content, mineralization degree of groundwater and the growth distribution characteristics of A. sparsifolia; the correlation of groundwater depth with growth distribution characteristics was less significant while other indicators had no significant correlation with the plant’s growth distribution characteristics. Synthesis analysis showed that mineralization degree of groundwater, groundwater depth, total salt of soil are main factors influencing growth distribution characteristics of A. sparsifolia. The increase of groundwater mineralization degree, soil total salt and groundwater table go against the growth of A. sparsifolia in saline habitat. (2) Leaf traits characteristics: With the increase of soil salinity, the area of A. sparsifolia leaf was "big - small - big" trend; Leaf thickness was "thin - thick - thin" trend; The specific leaf area, leaf dry matter content and leaf tissue density changed little; The change of total carbon content in the leaves of A. sparsifolia was less with the change of soil salinity, and the change of total nitrogen content and total phosphorus content was not obvious.(3) Root ramet characteristics: With the increase of soil salinity, the formation of A. sparsifolia seeds was restricted, and the way of reproduction by sexual reproduction and asexual reproduction coexist into only asexual reproduction, resulting in a reduction in the regeneration of the A. sparsifolia; The interval between the ramets increased gradually, and the depth of the ramets increased gradually, leading to the decrease of the number and ability of new plants; When the total salt content of soil is too high, there will be no new ramets, A. sparsifolia do not have a complete history of life, it can not carry out the natural breeding population. (4) Ion distribution characteristics: When grown on a light saline soil, Na+ distribution in different organs of A. sparsifolia followed the order of stem≈thorn>leaf>root; when grown on a severe saline soil, Na+ distribution followed leaf>stem≈thorn>root. The distribution of Ca2+ and Mg2+ followed leaf>thorn>stem>root. with the increase of soil salt level, Na+ content in different organs of A. sparsifolia increased, while K+ content in leave decreased; meanwhile the increasing soil salt level significantly decreased the K+/Na+ ratio in both root and leave, as well as the Ca2+/Na+ and Mg2+/Na+ ratios in all organs. The selective transportation coefficients for Ca2+-Na+（SCa,Na）and Mg2+-Na+ (SMg,Na) followed order of stem-leaf> stem-thorn> root-stem. |
| 学科主题 | 水土保持与荒漠化防治 |
| 语种 | 中文 |
| 源URL | [http://ir.xjlas.org/handle/365004/14888]  |
| 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 | 罗瀚林. 塔里木盆地南缘不同土壤盐分生境下骆驼刺适应特性研究[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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