| 内蒙古温带草原羊草叶片功能特性与光合特征对外源氮输入的响应 |
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| 引用本文： | 肖胜生,董云社,齐玉春,彭琴,何亚婷,刘欣超.内蒙古温带草原羊草叶片功能特性与光合特征对外源氮输入的响应[J].环境科学学报,2010,30(12):2535-2543. |
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| 作者姓名： | 肖胜生 董云社 齐玉春 彭琴 何亚婷 刘欣超 |
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| 作者单位： | 1. 中国科学院地理科学与资源研究所,北京,100101;中国科学院研究生院,北京,100049
2. 中国科学院地理科学与资源研究所,北京,100101 |
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| 基金项目： | 国家自然科学基金重点项目（No. 40730105）；国家自然科学基金面上基金（No. 40973057）；国家科技攻关计划（No. 2007BAC03A11-02） |
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| 摘 要： | 以内蒙古锡林河流域羊草草原典型植被羊草(Leymus chinensis)为研究对象,探讨了4个不同氮素输入水平(0、5、10和20g·m-·2a-1)下羊草叶片功能特性与光合特征的响应,并分析了外源氮输入背景下草地生态系统固碳潜势的变化.结果表明:中等水平施氮(10g·m-·2a-1)显著增加了羊草叶面积、叶绿素相对含量、叶氮浓度与净光合速率,但与中氮相比,高氮(20g·m-·2a-1)输入下却有所下降;施氮不仅对叶片净光合速率有一定程度的促进作用,而且延长了光合作用高峰期的持续时间;随着氮素添加梯度的增加,羊草叶片蒸腾速率降低,瞬时水分利用效率增高,气孔导度增大,胞间CO2浓度逐渐减小.从光合固碳的角度来看,适量的外源氮素输入有利于草地生态系统固定更多的CO2.
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| 关 键 词： | 羊草 氮输入 叶片功能特性 净光合速率 固碳 |
| 收稿时间： | 3/2/2010 5:12:18 PM |
| 修稿时间： | 6/6/2010 2:36:27 PM |
Effects of mineral fertilizer addition on leaf functional traits and photosynthetic characteristics of Leymus chinensis from a temperate grassland in Inner Mongolia in China |
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| XIAO Shengsheng,DONG Yunshe,QI Yuchun,PENG Qin,HE Yating and LIU Xinchao.Effects of mineral fertilizer addition on leaf functional traits and photosynthetic characteristics of Leymus chinensis from a temperate grassland in Inner Mongolia in China[J].Acta Scientiae Circumstantiae,2010,30(12):2535-2543. |
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| Authors: | XIAO Shengsheng DONG Yunshe QI Yuchun PENG Qin HE Yating and LIU Xinchao |
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| Institution: | 1. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101; 2. Graduate University of Chinese Academy of Sciences, Beijing 100049,Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101,Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101,1. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101; 2. Graduate University of Chinese Academy of Sciences, Beijing 100049,1. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101; 2. Graduate University of Chinese Academy of Sciences, Beijing 100049 and 1. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101; 2. Graduate University of Chinese Academy of Sciences, Beijing 100049 |
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| Abstract: | This study explored the responses of leaf functional traits and photosynthetic characteristics of Leymus chinensis to different nitrogen (N) addition rates (0,5,10 and 20 g·m-2·a-1) in the Xilin River Basin in Inner Mongolia. In addition, the potential carbon sequestration of grassland plants exposed to increased N supply was estimated. The results showed that N addition (N-10 treatments) significantly increased the leaf area, relative chlorophyll content, leaf N concentration and net photosynthetic rates of L. chinensis. The N addition also extended the peak period of photosynthesis. With the increase of N addition rates, the transpiration rate, internal CO2 concentration gradually decreased, but instantaneous water-use efficiency and stomatal conductance increased gradually. The results indicated moderate N input would enhance CO2 sequestration through photosynthesis in semiarid temperate grassland. |
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| Keywords: | Leymus chinensis N input leaf functional traits net photosynthetic rate carbon sequestration |
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