中国地理科学 ›› 2014, Vol. 0 ›› Issue (6): 674-681.doi: 10.1007/s11769-014-0691-4

• 论文 • 上一篇    下一篇

Effects of Nitrogen Addition on Plant Functional Traits in Freshwater Wetland of Sanjiang Plain, Northeast China

MAO Rong1,2, ZHANG Xinhou1, SONG Changchun1   

  1. 1. Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China;
    2. Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology, Ministry of Land and Resources of China, Qingdao 266071, China
  • 收稿日期:2013-03-12 修回日期:2013-06-05 出版日期:2014-09-27 发布日期:2014-11-10
  • 通讯作者: MAO Rong. E-mail: maorong@neigae.ac.cn E-mail:maorong@neigae.ac.cn
  • 基金资助:

    Under the auspices of Strategic Priority Research Program­-Climate Change: Carbon Budget and Related Issues of Chinese Academy of Sciences (No. XDA05050508), Ministry of Land and Resources Program (No. 201111023, GZH201100203) Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology, Ministry of Land and Resources (No. MRE201101)

Effects of Nitrogen Addition on Plant Functional Traits in Freshwater Wetland of Sanjiang Plain, Northeast China

MAO Rong1,2, ZHANG Xinhou1, SONG Changchun1   

  1. 1. Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China;
    2. Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology, Ministry of Land and Resources of China, Qingdao 266071, China
  • Received:2013-03-12 Revised:2013-06-05 Online:2014-09-27 Published:2014-11-10
  • Contact: MAO Rong. E-mail: maorong@neigae.ac.cn E-mail:maorong@neigae.ac.cn
  • Supported by:

    Under the auspices of Strategic Priority Research Program­-Climate Change: Carbon Budget and Related Issues of Chinese Academy of Sciences (No. XDA05050508), Ministry of Land and Resources Program (No. 201111023, GZH201100203) Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology, Ministry of Land and Resources (No. MRE201101)

摘要:

To clarify the responses of plant functional traits to nitrogen (N) enrichment, we investigated the whole-plant traits (plant height and aboveground biomass), leaf morphological (specific leaf area (SLA) and leaf dry mass content (LDMC)) and chemical traits (leaf N concentration (LNC) and leaf phosphorus (P) concentration (LPC)) of Deyeuxia angustifolia and Glyceria spiculosa following seven consecutive years of N addition at four rates (0 g N/(m2·yr), 6 g N/(m2·yr), 12 g N/(m2·yr) and 24 g N/(m2·yr)) in a freshwater marsh in the Sanjiang Plain, Northeast China. The results showed that, for both D. angustifolia and G. spiculosa, N addition generally increased plant height, leaf, stem and total aboveground biomass, but did not cause changes in SLA and LDMC. Moreover, increased N availability caused an increase in LNC, and did not affect LPC. Thus, N addition decreased leaf C:N ratio, but caused an increase in leaf N:P ratio, and did not affect leaf C:P ratio. Our results suggest that, in the mid-term, elevated N loading does not alter leaf morphological traits, but causes substantial changes in whole-plant traits and leaf chemical traits in temperate freshwater wetlands. These may help to better understand the effects of N enrichment on plant functional traits and thus ecosystem structure and functioning in freshwater wetlands.

关键词: nitrogen addition, Deyeuxia angustifolia, Glyceria spiculosa, leaf chemical traits, leaf morphological traits, whole-plant traits, Sanjiang Plain

Abstract:

To clarify the responses of plant functional traits to nitrogen (N) enrichment, we investigated the whole-plant traits (plant height and aboveground biomass), leaf morphological (specific leaf area (SLA) and leaf dry mass content (LDMC)) and chemical traits (leaf N concentration (LNC) and leaf phosphorus (P) concentration (LPC)) of Deyeuxia angustifolia and Glyceria spiculosa following seven consecutive years of N addition at four rates (0 g N/(m2·yr), 6 g N/(m2·yr), 12 g N/(m2·yr) and 24 g N/(m2·yr)) in a freshwater marsh in the Sanjiang Plain, Northeast China. The results showed that, for both D. angustifolia and G. spiculosa, N addition generally increased plant height, leaf, stem and total aboveground biomass, but did not cause changes in SLA and LDMC. Moreover, increased N availability caused an increase in LNC, and did not affect LPC. Thus, N addition decreased leaf C:N ratio, but caused an increase in leaf N:P ratio, and did not affect leaf C:P ratio. Our results suggest that, in the mid-term, elevated N loading does not alter leaf morphological traits, but causes substantial changes in whole-plant traits and leaf chemical traits in temperate freshwater wetlands. These may help to better understand the effects of N enrichment on plant functional traits and thus ecosystem structure and functioning in freshwater wetlands.

Key words: nitrogen addition, Deyeuxia angustifolia, Glyceria spiculosa, leaf chemical traits, leaf morphological traits, whole-plant traits, Sanjiang Plain