| 高寒植物群落优势种光合日变化及其与环境因子的关系 |
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| 引用本文： | 侍瑞,苏培玺,周紫鹃,丁新景.高寒植物群落优势种光合日变化及其与环境因子的关系[J].中国沙漠,2019,39(4):46-53. |
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| 作者姓名： | 侍瑞 苏培玺 周紫鹃 丁新景 |
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| 作者单位： | 1. 中国科学院西北生态环境资源研究院 寒旱区陆面过程与气候变化重点实验室, 甘肃 兰州 730000;2. 中国科学院大学, 北京 100049 |
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| 基金项目： | 中国科学院战略性先导科技专项（XDA20050102）；国家自然科学基金项目（41871043）；甘肃省科技计划项目（17CX1FP076） |
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| 摘 要： | 为分析不同高寒植物群落优势种的光合特性,探究影响光合作用的主要环境因子,选择若尔盖高原同纬度同海拔的沼泽湿地、湿草甸和干草甸样地,对比研究典型植物群落优势种木里苔草(Carex muliensis)、四川嵩草(Kobresia setchwanensis)和垂穗披碱草(Elymus nutans)光合日变化。结果表明:(1)由于水分条件差异显著(P<0.05),沼泽湿地优势种木里苔草的净光合速率(Pn)日变化呈单峰趋势,而湿草甸和干草甸优势种Pn则为双峰曲线,存在光合"午休"现象。(2)水分利用效率(WUE)日均值表现为干草甸优势种>湿草甸优势种>沼泽湿地优势种;各群落优势种光能利用效率(LUE)日均值无显著差异。(3)沼泽湿地优势种Pn主要受光合有效辐射(PAR)、气温(Ta)和空气相对湿度(RH)的影响;干草甸Ta和PAR为主要环境因子,湿草甸影响优势种Pn的主导因素为PAR。
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| 关 键 词： | 若尔盖 净光合速率 环境因子 通径分析 |
| 收稿时间： | 2018-03-30 |
| 修稿时间： | 2018-07-02 |
Photosynthetic Diurnal Changes of Dominant Species in Different Alpine Plant Communities and Their Relationships with Environmental Factors |
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| Shi Rui,Su Peixi,Zhou Zijuan,Ding Xinjing.Photosynthetic Diurnal Changes of Dominant Species in Different Alpine Plant Communities and Their Relationships with Environmental Factors[J].Journal of Desert Research,2019,39(4):46-53. |
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| Authors: | Shi Rui Su Peixi Zhou Zijuan Ding Xinjing |
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| Institution: | 1. Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;2. University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | In order to analyze the photosynthetic characteristics of dominant species in different alpine plant communities and explore the main environmental factors which affect the photosynthesis, three communities, swamp, wet meadow and dry meadow, were selected at the same latitude and altitude in the Zoige Plateau, and photosynthetic diurnal changes of their dominant species, Carex muliensis, Kobresia setchwanensis and Elymus nutans were compared. The results showed that:were the main environmental affecting factors of Pn. The Pn of dominant species in dry meadow was mainly affected by Ta and PAR. The leading factor which affect Pn in wet meadow was PAR. |
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| Keywords: | Zoige Plateau net photosynthetic rate environment factor path analysis |
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