植物生态学报 ›› 2018, Vol. 42 ›› Issue (9): 963-970.doi: 10.17521/cjpe.2018.0085

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氮磷供应量及比例对灰绿藜种子性状的影响

田大栓()   

  1. 中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室, 北京 100101
  • 收稿日期:2018-02-26 修回日期:2018-05-29 出版日期:2018-09-20 发布日期:2018-09-26
  • 通讯作者: 田大栓 E-mail:tiands@igsnrr.ac.cn
  • 基金资助:
    国家自然科学基金(31600356);国家重点基础研究发展计划973计划(2017YFA0604801)

Effects of the supply levels and ratios of nitrogen and phosphorus on seed traits of Chenopodium glaucum

TIAN Da-Shuan()   

  1. Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
  • Received:2018-02-26 Revised:2018-05-29 Online:2018-09-20 Published:2018-09-26
  • Contact: Da-Shuan TIAN E-mail:tiands@igsnrr.ac.cn
  • Supported by:
    Supported by the National Natural Science Foundation of China.(31600356);the National Basic Research Program of China(2017YFA0604801)

摘要:

全球氮沉降不仅改变土壤氮和磷的有效性, 同时也改变氮磷比例。氮磷供应量、比例及其交互作用可能会影响植物种子性状。该研究在内蒙古草原基于沙培盆栽实验种植灰绿藜(Chenopodium glaucum), 设置3个氮磷供应量水平和3个氮磷比例的正交实验来探究氮磷供应量、比例及其交互作用对灰绿藜种子性状的影响。结果发现氮磷供应量对种子氮浓度、磷浓度和萌发率影响的相对贡献(15%-24%)大于氮磷比例(3%-7%), 而种子大小只受氮磷比例的影响。同时氮磷供应量和比例之间的交互作用显著影响种子氮浓度和磷浓度。同等氮磷比例情况下, 低量养分供应提高种子氮浓度、磷浓度和萌发率。氮磷比例只有在养分匮乏的环境中才会对种子大小和萌发率产生显著影响。总之, 灰绿藜种子不同性状对氮或磷限制的敏感性不同, 同时种子性状也对养分限制表现出适应性和被动响应。

关键词: 种子性状, 氮供应水平, 磷供应水平, 氮磷比例, 沙培盆栽实验, 适应性响应

Abstract:
Aims Global nitrogen (N) deposition not only alters soil N and phosphorus (P) availability, but also changes their ratio. The levels and ratios of N and P supply and their interaction may simultaneously influence plant seed traits. However, so far there has been no experiments to distinguish these complex impacts on plant seed traits in the field.
Methods A pot experiment with a factorial design of three levels and ratios of N and P supply was conducted in the Nei Mongol grassland to explore the effects of levels and ratios of N and P supply and their interaction on seed traits of Chenopodium glaucum.
Important findings We found that the relative contribution (15%-24%) of N and P supply levels in affecting the N concentrations, P concentrations and germination rates of seeds was larger than that (3%-7%) of N:P supply ratios, whereas seed size was only significantly influenced by N:P. Simultaneously, seed N and P concentrations were impacted by the interaction of N and P supply levels and ratios. At the same N:P, decrease in nutrient supply levels increased seed N concentrations, P concentrations and germination rates. N:P supply ratios only had a significant effect on seed size and germination rates under low nutrient levels. Overall, these results indicate that different seed traits of C. glaucum show different sensitivities to N or P limitations, leading to adaptive and passive responses under different nutrient limitations. This study presents the the first field experiment to distinguish the effects of nutrient supply levels, ratios and their interactions on plant seed traits, which provides a new case study on the influences of global N deposition on future dynamics of plant population and community.

Key words: seed trait, nutrient supply level, phosphorus supply level, N:P, sand cultured pot experiment, adaptive response