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粗枝猪毛菜对不同降水添加处理的生理生态响应研究
任雯
学位类型硕士
导师马健
2017-05-01
学位授予单位中国科学院大学
学位授予地点新疆乌鲁木齐
学位专业工程硕士
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
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.
其他摘要在干旱荒漠区,水分是植物生长首要最主要的限制因子。由于干旱区年平均降水量少且分布不均,能够为植物吸收利用的大量级降水发生频次比小量级降水低,而小量级降水不能深入植物根系供其吸收利用。随着全球气候变化,干旱区大降雨事件的发生频次及其降水强度有逐年增加的趋势。为了探究干旱荒漠区植被的水分利用情况及不同频率降水对其生长发育、养分吸收利用策略的影响,本文选取粗枝猪毛菜作为研究对象,设置三种降水处理模式:每月 1 次/ 20 mm (W1)、每月 2 次/ 10 mm (W2)、每月 4 次 / 5 mm (W4)及对照处理(CK)。通过测定其在总降水量相同但降水频次不同的降水环境中的生理生态方面的指标变化,主要研究结果如下:(1)小降雨脉冲只能影响表层土壤含水量,而大量级降水(>10 mm)对土壤含水量的影响深入到 50 cm 甚至更深。(2)大量级降水(20 mm)会刺激粗枝猪毛菜在幼苗期的生长及地上生物量的积累;每月 2 次/ 10 mm 降水处理使植物地下-地上生物量比( R / S )降低。(3)每月 1 次大量级降水促进植株地下生物量的积累,小量级降水有利于植株种子繁殖。(4)植株体内的 N、P 含量受降水频次的影响,叶片中的氮含量和磷含量出现先增加后减少的趋势,而茎中和果实中的氮含量呈现逐步累积的趋势。 本研究通过对人工模拟降水处理下粗枝猪毛菜生理生态方面指标的综合分析,得出促进荒漠植物粗枝猪毛菜生长发育的补水方案,即在自然降雨的情况下,每月增雨 4 次/ 5 mm ,有利于植物的种子繁殖,而每月增雨 2 次/ 10 mm 的降雨不利于粗枝猪毛菜的生长。因此,初步得出每月一次大量级降雨或数次小量级降雨有利于植物生长繁殖。
学科领域环境工程
语种中文
文献类型学位论文
条目标识符http://ir.xjlas.org/handle/365004/14894
专题研究系统_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
第一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.
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