Peñuelas J, Filella I, Tognetti R (2001) Leaf mineral concentrations of Erica arborea, Juniperus communis and Myrtus communis growing in the proximity of a natural CO2 spring. Global Change Biology 7:291-301.
Peñuelas J, Filella I (2001) Responses to a warming world. Science 294:793-795.
Peñuelas J., Filella I. (2001) Phenology: Responses to a warming world. Science. 294: 793-795.EnlaceDoi: 10.1126/science.1066860
[No abstract available]
Peñuelas J., Filella I. (2001) Herbaria century record of increasing eutrophication in Spanish terrestrial ecosystems. Global Change Biology. 7: 427-433.EnlaceDoi: 10.1046/j.1365-2486.2001.00421.x
Additional biological evidence is presented for the alteration of biogeochemical cycles by human activities. The leaf δ15N and the concentrations of nutrients in herbarium specimens of 24 species of vascular plants and 3 species of bryophytes collected in northern and eastern regions of Spain have substantially changed throughout the XX century. In the second half of the century, when anthropogenic nitrogen fixation and mobilization started to increase rapidly, leaf δ15N values started to decrease strongly, indicating that additional anthropogenic nitrogen is being retained in Spanish terrestrial ecosystems. The concentration of nutrients in vascular plants did not present any clear pattern, but there were increasing concentrations of N and other nutrients (P, K, and S) in the last decades in bryophytes, which are usually better biomonitors of airborne chemicals than vascular plants. Important consequences for ecosystem structure and functioning such as enhancement of the carbon sink or changes in community biodiversity and species distribution may be expected from this increase in eutrophication.
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