粗枝猪毛菜对不同降水添加处理的生理生态响应研究
文献类型：学位论文
| 作者 | 任雯 |
| 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 | 马健 |
| 关键词 | 粗枝猪毛菜 不同频次降水 用水策略 生态化学计量 Salsola subrassa M.Pop. Different frequency precipitation Water use strategy Ecological stoichiometry |
| 学位专业 | 工程硕士 |
| 英文摘要 | Water is the primary limiting factor for plant growth in arid desert areas. As the averageannual precipitation became less and uneven distribution in arid area, the frequency of thelarge scale precipitation events which plants can uptake and utilization is lower than thesmall scale precipitation that couldn’t penetrate plant roots for the use of its absorption.With the global climate change, the frequency and intensity of heavy rainfall events areincreasing year by year. In order to explore the water use strategy of plants and the influence for its development,nutrient absorption and the adaptability to the environment under different frequencyrainfall and precipitation. We chose Salsola subcrassa M.Pop. As subject investigated andmade three precipitation patterns: once per month/ 20 mm, twice per month/ 10 mm, forthper month/ 5 mm and contrast. By measuring its physiological and ecological index underthe situation that there have identical precipitation but different frequency. The main resultsare as follows: (1) Small rainfall pulse could only affect the surface soil water content, and a largenumber of precipitation ( > 10 mm) could be affected by soil water content to 50 cm oreven deeper. (2) A large class of precipitation (20 mm) would stimulate the rapid growth of S.subcrassa M.Pop. and the biomass accumulated; Monthly 2/ 10 mm precipitationtreatments resulted in lower R/S. (3) A large amount of precipitation per month promotes the accumulation ofunderground biomass, a small amount of precipitation is conducive to plant seedreproduction. (4) The content of N, P in plants were affected by the frequency of precipitation. N, P inleaves increased first and then decreased, while the content of them in stems and fruitsshowed a trend of gradual accumulation. In this study, through the comprehensive analysis of S. subrassa M.Pop. physiologicaland ecological indicators, we obtained the results which showed the optimum precipitationthreshold of desert plants growth, namely regardless of natural rainfall conditions, themonthly rainfall of 4/ 5 mm wasn’t conductive to the desert plants growth. Therefore, weinitially obtained a large precipitation once a month or several small rainfall was conduciveto plants growth and reproduction. |
| 学科主题 | 环境工程 |
| 语种 | 中文 |
| 源URL | [http://ir.xjlas.org/handle/365004/14894]  |
| 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 | 任雯. 粗枝猪毛菜对不同降水添加处理的生理生态响应研究[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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