Responses of Vegetation and Ecosystem CO2 Exchange to 9 Years of Nutrient Addition at Mer Bleue Bog

被引:69
作者
Juutinen, Sari [1 ,3 ]
Bubier, Jill L. [1 ]
Moore, Tim R. [2 ]
机构
[1] Mt Holyoke Coll, Environm Studies Program, S Hadley, MA 01075 USA
[2] McGill Univ, Dept Geog, Montreal, PQ H3A 2K6, Canada
[3] Univ Helsinki, Dept Forest Sci, FIN-00014 Helsinki, Finland
基金
加拿大自然科学与工程研究理事会; 美国国家科学基金会;
关键词
atmospheric nitrogen deposition; peatland; carbon; N; P; K; net ecosystem exchange; Sphagnum; Polytrichum strictum; shrubs; ATMOSPHERIC NITROGEN DEPOSITION; CARBON-DIOXIDE EXCHANGE; NUTRITIONAL CONSTRAINTS; NORTHERN PEATLANDS; VASCULAR PLANTS; SPHAGNUM-FUSCUM; ALASKAN TUNDRA; BOREAL; GROWTH; FERTILIZATION;
D O I
10.1007/s10021-010-9361-2
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Anthropogenic nitrogen (N) loading has the potential to affect plant community structure and function, and the carbon dioxide (CO2) sink of peatlands. Our aim is to study how vegetation changes, induced by nutrient input, affect the CO2 exchange of a nutrient-limited bog. We conducted 9- and 4-year fertilization experiments at Mer Bleue bog, where we applied N addition levels of 1.6, 3.2, and 6.4 g N m(-2) a(-1), upon a background deposition of about 0.8 g N m(-2) a(-1), with or without phosphorus and potassium (PK). Only the treatments 3.2 and 6.4 g N m(-2) a(-1) with PK significantly affected CO2 fluxes. These treatments shifted the Sphagnum moss and dwarf shrub community to taller dwarf shrub thickets without moss, and the CO2 responses depended on the phase of vegetation transition. Overall, compared to the large observed changes in the vegetation, the changes in CO2 fluxes were small. Following Sphagnum loss after 5 years, maximum ecosystem photosynthesis (Pg(max)) and net CO2 exchange (NEEmax) were lowered (-19 and -46%, respectively) in the highest NPK treatment. In the following years, while shrub height increased, the vascular foliar biomass did not fully compensate for the loss of moss biomass; yet, by year 8 there were no significant differences in Pg(max) and NEEmax between the nutrient and the control treatments. At the same time, an increase (24-32%) in ecosystem respiration (ER) became evident. Trends in the N-only experiment resembled those in the older NPK experiment by the fourth year. The increasing ER with increasing vascular plant and decreasing Sphagnum moss biomass across the experimental plots suggest that high N deposition may lessen the CO2 sink of a bog.
引用
收藏
页码:874 / 887
页数:14
相关论文
共 50 条
  • [41] CO2 exchange along a hydrologic gradient in the Kenai Lowlands, AK: feedback implications of wetland drying and vegetation succession
    Ives, Susan L.
    Sullivan, Patrick F.
    Dial, Roman
    Berg, Edward E.
    Welker, Jeffrey M.
    ECOHYDROLOGY, 2013, 6 (01) : 38 - 50
  • [42] Mapping the net ecosystem exchange of CO2 of global terrestrial systems
    Lian, Yi
    Li, Haixiao
    Renyang, Qianqian
    Liu, Le
    Dong, Jiankang
    Liu, Xiaoning
    Qu, Zihan
    Lee, Lien-Chieh
    Chen, Lei
    Wang, Dongliang
    Zhang, Hu
    INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION, 2023, 116
  • [43] Net ecosystem CO2 exchange in a boreal peatland, northern Manitoba
    Bellisario, LM
    Moore, TR
    Bubier, JL
    ECOSCIENCE, 1998, 5 (04): : 534 - 541
  • [44] Partitioning net ecosystem carbon exchange with isotopic fluxes of CO2
    Bowling, DR
    Tans, PP
    Monson, RK
    GLOBAL CHANGE BIOLOGY, 2001, 7 (02) : 127 - 145
  • [45] Unique characteristics of ecosystem CO2 exchange in Sundarban mangrove forest and their relationship with environmental factors
    Rodda, Suraj Reddy
    Thumaty, Kiran Chand
    Fararoda, Rakesh
    Jha, Chandra Shekhar
    Dadhwal, Vinay Kumar
    ESTUARINE COASTAL AND SHELF SCIENCE, 2022, 267
  • [46] Innovative gap-filling strategy for annual SUMS of CO2 net ecosystem exchange
    Ruppert, J.
    Mauder, M.
    Thomas, C.
    Lueers, J.
    AGRICULTURAL AND FOREST METEOROLOGY, 2006, 138 (1-4) : 5 - 18
  • [47] Potassium limits potential growth of bog vegetation under elevated atmospheric CO2 and N deposition
    Hoosbeek, MR
    Van Breemen, N
    Vasander, H
    Buttler, A
    Berendse, F
    GLOBAL CHANGE BIOLOGY, 2002, 8 (11) : 1130 - 1138
  • [48] Variation in CO2 exchange over three summers at microform scale in a boreal bog, Eastmain region, Quebec, Canada
    Pelletier, L.
    Garneau, M.
    Moore, T. R.
    JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES, 2011, 116
  • [49] Interannual variability in the ecosystem CO2 fluxes at a paludified spruce forest and ombrotrophic bog in the southern taiga
    Mamkin, Vadim
    Avilov, Vitaly
    Ivanov, Dmitry
    Varlagin, Andrey
    Kurbatova, Julia
    ATMOSPHERIC CHEMISTRY AND PHYSICS, 2023, 23 (03) : 2273 - 2291
  • [50] Long-Term Warming and Nitrogen Addition Regulate Responses of Dark Respiration and Net Photosynthesis in Boreal Bog Plants to Short-Term Increases in CO2 and Temperature
    Le, Thuong Ba
    Wu, Jianghua
    Gong, Yu
    Dinh, Mai-Van
    ATMOSPHERE, 2022, 13 (10)