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草业学报 ›› 2016, Vol. 25 ›› Issue (3): 251-256.DOI: 10.11686/cyxb2015391

• 研究简报 • 上一篇    

氮素和水分添加对荒漠草原短花针茅氮磷特征的影响

白春利1, 2, 刘永志2, 王明玖1, *, 单玉梅2, 哈斯呼1   

  1. 1.内蒙古农业大学生态环境学院,内蒙古 呼和浩特 010019;
    2.内蒙古自治区农牧业科学院,内蒙古 呼和浩特 010031
  • 收稿日期:2015-09-01 出版日期:2016-03-20 发布日期:2016-03-20
  • 通讯作者: E-mail:wangmj_0540@163.com
  • 作者简介:白春利(1980-),女,内蒙古乌兰察布人,博士.E-mail:nmgbcl@126.com
  • 基金资助:
    内蒙古科技创新引导奖励资金计划(20140701)和国家牧草产业体系(CARS-35-27)项目资助

Effects of nitrogen and water addition on herbage N and P concentrations of Stipa breviflora in a desert steppe grassland

BAI Chun-Li1, 2, LIU Yong-Zhi2, WANG Ming-Jiu1, *, SHAN Yu-Mei2, Hasihu1   

  1. 1.College of Ecology and Environmental Science, Inner Mongolia Agricultural University, Hohhot 010019, China;
    2.Inner Mongolia Academy of Agricultural & Animal-Husbandry Sciences, Hohhot 010031, China
  • Received:2015-09-01 Online:2016-03-20 Published:2016-03-20

摘要: 植物氮(N),磷(P)含量特征为研究植物的养分利用状况提供了重要的手段.为判断草地生态系统植被限制性元素及对环境的适应策略,在短花针茅荒漠草原的自由放牧区进行了N和水分添加试验,研究在N和水分添加条件下优势植物短花针茅叶的N,P含量及其化学计量特征.通过对N添加,水添加和N水同时添加3个处理的测定表明,短花针茅通过提高叶N含量来增强对贫瘠生境的适应能力.N和水分是影响短花针茅N吸收的限制因子.短花针茅叶N,P含量及N:P对N添加和水添加的响应在成熟期较枯萎期敏感;N对成熟期叶的N,P含量,N:P以及枯萎期的N:P有显著影响,而水分仅对成熟期叶的N,P含量有影响.

Abstract: Knowledge of herbage nitrogen (N) and phosphorus (P) in plants is fundamental to the study of absorption and utilization of nutrients by the plants. In order to better understand limiting factors and plant adaption strategies to environmental factors in the grassland ecosystem, water and N enhancement experiments were carried out in a Stipa breviflora steppe. Four treatments were set up: nitrogen addition (ND), water addition (WD), nitrogen and water addition (NWD) and control (CK) with five replicates in a free grazed paddock in a S. breviflora desert steppe, Inner Mongolia. The S. breviflora leaf N and P concentrations and their stoichiometry under different treatments were analyzed. It was found that S. breviflora enhanced adaptability to barren habitats by increasing leaf N content. Uptake of N by S. breviflora was limited by low soil N and water contents. The absolute leaf N and P contents and the N:P ratio were more sensitive to the environmental addition of N and water in mid season than in late season. The availability of environmental N greatly influenced the leaf N and P contents and N:P ratio in mid season and the N:P ratio in late season when plants were withering. However, the availability of water only affected the leaf N and P content in mid season and not in late season.