干旱区研究

干旱区研究 ›› 2012, Vol. 29 ›› Issue (2): 347-351.

• 水土资源 • 上一篇    下一篇

荒漠草地植物稳定性氮同位素对水分变化的响应

禹朴家1,2,3,4, 徐海量1, 王炜1, 张鹏1,4, 赵新风1,4, 刘新华1,3, 张青青1,3   

    1.  中国科学院 新疆生态与地理研究所，新疆 乌鲁木齐 830011； 
    2. 中国科学院 东北地理与农业生态研究所，吉林 长春 130012；
    3. 中国科学院 研究生院，北京 100049；
    4. 中国科学院 阜康荒漠生态研究站,新疆 阜康831505
  • 收稿日期:2011-03-04 修回日期:2011-05-19 出版日期:2012-03-15 发布日期:2012-04-10
  • 通讯作者: 徐海量. E-mail: xuhl@ms.ac.cn
  • 作者简介:禹朴家(1986-)，男，山东泰安人，硕士，主要从事干旱区生态环境和恢复生态学研究. E-mail：yupujia@126.com
  • 基金资助:

    国家重点基础研究发展规划项目973项目（2009CB421102）；国家自然科学基金（4101534）资助

YU  Pu-Jia1,2,3,4, XU  Hai-Liang1, WANG  Wei1,ZHANG  Peng1,4,, ZHAO  Xin-Feng1,4, LIU  Xin-Hua1,3 ,ZHANG  Qing-Qing,1,3   

    1. Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
    2. Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130012, China;
    3. Graduate University, Chinese Academy of Sciences, Beijing 100049, China;
    4.  Fukang Station for Desert Ecosystem Observation and Experiment, Chinese Academy of Sciences, Fukang 831505, Xinjiang, China)
  • Received:2011-03-04 Revised:2011-05-19 Online:2012-03-15 Published:2012-04-10

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摘要： 水分是影响荒漠地区植被分布的重要因素，近年来，我国西部地区的气候正向暖湿化发展，降水的变化势必会对植物N同位素的吸收、分配产生影响。利用15N标记法，通过不同的增水处理，研究古尔班通古特沙漠南缘标记样地和未标记样地植物N同位素吸收和分配对水分变化的响应，得出以下结论：① 增水处理增加了对土壤水分的补给，显著提高了土壤水分含量；② 未标记样地植物稳定性N同位素的[WTBX]Ndff[WTBZ]值的变化范围为0.39～0.59，其最大值出现在30%增水处理，最小值出现在20%增水处理；③ 氮素标记后，样地植物稳定性N同位素Ndff值明显上升，其变化范围为15.27～31.24。从植物不同部位来看，植物吸收的氮素在植物茎中的分配比例最大，而在根中的分配比例最小。

关键词: 稳定性N同位素, 土壤水分, 降水格局, 荒漠草地, 植物生长, 古尔班通古特沙漠

Abstract: Soil moisture content is an important factor for the distribution of desert vegetation. Climate warmingwetting trend is becoming more obvious in west China in recent years. The increase of precipitation will inevitably affect the N isotope absorption of plants. In this paper, the response of plant N isotope to soil moisture content change in the labeled and unlabeled sample plots in the southern marginal zone of the Gurbantunggut Desert were studied using the 15N labeling method. The results are as follows: (1) The water increase treatment increased significantly the soil moisture regime and soil moisture content; (2) Ndff in plants in the study area varied in a range from 0.39 to 0.59, its highest value occurred in a treatment case of soil moisture content increased by 30%, and the lowest one was found in a treatment case of soil moisture content increased by 20%; (3) The plant Ndff was increased significantly after applying nitrogenous fertilizer, and it varied in a range of 15.27-31.24. From the perspective of different parts of plant, the proportion of nitrogen absorbed by plant was the highest in stems, and it was the lowest in roots.

Key words: stable N isotope, soil moisture content, precipitation increase, desert grassland, plant growth, Gurbantunggut Desert

stable N isotope, soil moisture content, precipitation increase, desert grassland, plant growth, Gurbantunggut Desert
stable N isotope, soil moisture content, precipitation increase, desert grassland, plant growth, Gurbantunggut Desert

stable N isotope, soil moisture content, precipitation increase, desert grassland, plant growth, Gurbantunggut Desert