Accumulation and use of nitrogen and phosphorus following fertilization in two alpine tundra communities [nutrient use efficiency, N deposition]

absorption de substances nutritives arctic tundra azote biodiversidad biodiversity climat de montagne colorado comunidades vegetales crecimiento croissance disponibilidad de nutrientes ecosistema ecosystems especies fertilidad del suelo fertilisation fertilizer application fosforo growth meadows mountain climate nitrogen nutrient availability nutrient uptake phosphore phosphorus plant communities plantas plante plants prados de siega prairie de fauche soil fertility species toundra arctique tundra artica