Central European hardwood trees in a high-CO2 future: synthesis of an 8-year forest canopy CO2 enrichment project

被引:116
作者
Bader, Martin K. -F. [1 ,2 ]
Leuzinger, Sebastian [1 ,3 ]
Keel, Sonja G. [4 ,5 ,6 ]
Siegwolf, Rolf T. W. [6 ]
Hagedorn, Frank [7 ]
Schleppi, Patrick [7 ]
Koerner, Christian [1 ]
机构
[1] Univ Basel, Inst Bot, CH-4056 Basel, Switzerland
[2] New Zealand Forest Res Inst SCION, Rotorua 3046, New Zealand
[3] Auckland Univ Technol, Sch Appl Sci, Inst Appl Ecol New Zealand, Auckland 1142, New Zealand
[4] Univ Bern, Phys Inst, CH-3012 Bern, Switzerland
[5] Univ Bern, Oeschger Ctr Climate Change Res Climate & Environ, CH-3012 Bern, Switzerland
[6] Paul Scherrer Inst, Lab Atmospher Chem, CH-5323 Villigen, Switzerland
[7] Swiss Fed Inst Forest Snow & Landscape Res WSL, CH-8903 Birmensdorf, Switzerland
基金
瑞士国家科学基金会;
关键词
CO2; fertilization; coupled climate-carbon cycle model; ecosystem carbon cycling; elevated CO2; free-air CO2 enrichment (FACE); global carbon cycle; CARBON-DIOXIDE ENRICHMENT; ELEVATED CO2; STOMATAL CONDUCTANCE; SOIL RESPIRATION; ATMOSPHERIC CO2; ORGANIC-CARBON; RESPONSES; NITROGEN; STIMULATION; CLIMATE;
D O I
10.1111/1365-2745.12149
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Rapidly increasing atmospheric CO2 is not only changing the climate system but may also affect the biosphere directly through stimulation of plant growth and ecosystem carbon and nutrient cycling. Although forest ecosystems play a critical role in the global carbon cycle, experimental information on forest responses to rising CO2 is scarce, due to the sheer size of trees. Here, we present a synthesis of the only study world-wide where a diverse set of mature broadleaved trees growing in a natural forest has been exposed to future atmospheric CO2 levels (c. 550ppm) by free-air CO2 enrichment (FACE). We show that litter production, leaf traits and radial growth across the studied hardwood species remained unaffected by elevated CO2 over 8years. CO2 enrichment reduced tree water consumption resulting in detectable soil moisture savings. Soil air CO2 and dissolved inorganic carbon both increased suggesting enhanced below-ground activity. Carbon release to the rhizosphere and/or higher soil moisture primed nitrification and nitrate leaching under elevated CO2; however, the export of dissolved organic carbon remained unaltered.Synthesis. Our findings provide no evidence for carbon-limitation in five central European hardwood trees at current ambient CO2 concentrations. The results of this long-term study challenge the idea of a universal CO2 fertilization effect on forests, as commonly assumed in climate-carbon cycle models.
引用
收藏
页码:1509 / 1519
页数:11
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