Responses of net ecosystem CO2 exchange in managed grassland to long-term CO2 enrichment, N fertilization and plant species

被引:29
作者
Aeschlimann, U
Nösberger, J
Edwards, PJ
Schneider, MK
Richter, M
Blum, H
机构
[1] ETH, Inst Plant Sci, CH-8092 Zurich, Switzerland
[2] ETH, Geobot Inst, CH-8044 Zurich, Switzerland
[3] Univ York, Dept Biol, York YO10 5YW, N Yorkshire, England
关键词
Lolium perenne; Trifolium repens; assimilation; carbon balance; FACE; night-time respiration;
D O I
10.1111/j.1365-3040.2005.01331.x
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
The effects of elevated pCO(2) on net ecosystem CO2 exchange were investigated in managed Lolium perenne (perennial ryegrass) and Trifolium repens (white clover) monocultures that had been exposed continuously to elevated pCO(2) (60 Pa) for nine growing seasons using Free Air CO2 Enrichment (FACE) technology. Two levels of nitrogen (N) fertilization were applied. Midday net ecosystem CO2 exchange (mNEE) and night-time ecosystem respiration (NER) were measured in three growing seasons using an open-flow chamber system. The annual net ecosystem carbon (C) input resulting from the net CO2 fluxes was estimated for one growing season. In both monocultures and at both levels of N supply, elevated pCO(2) stimulated mNEE by up to 32%, the exact amount depending on intercepted PAR. The response of mNEE to elevated pCO(2) was larger than that of harvestable biomass. Elevated pCO(2) increased NER by up to 39% in both species at both levels of N supply. NER, which was affected by mNEE of the preceding day, was higher in T. repens than in L. perenne. High N increased NER compared to low N supply. According to treatment, the annual net ecosystem C input ranged between 210 and 631 g C m(-2) year(-1) and was not significantly affected by the level of pCO(2). Low N supply led to a higher net C input than high N supply. We demonstrated that at the ecosystem level, there was a long-term stimulation in the net C assimilation during daytime by elevated pCO(2). However, because NER was also stimulated, net ecosystem C input was not significantly increased at elevated pCO(2). The annual net ecosystem C input was primarily affected by the amount of N supplied.
引用
收藏
页码:823 / 833
页数:11
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