Abstract
In the Swiss grassland FACE experiment, we measured the effect of elevated CO 2 on the shoot necromass production and quality of Lolium perenne in 1995. Dead stubble of reproductive tillers and dead leaf sheaths were the main components of necromass. Elevated CO 2 did not significantly change the amount and the nitrogen concentration of necromass. Significantly more necromass was produced and the N concentration was lower in the low N supply treatments. Total necromass amounted to 250–500 g m −2. Necromass N content was in the order of 5–6 g m −2. This underscores the importance of the carbon and nitrogen fluxes included in necromass and their importance for soil biology and fertility.
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