From these results the possible patterns along altitudinal gradients were deduced
(arrows in Fig. 2). First, I considered the situation when only PNUE would decrease and
soil nutrient concentration remained constant. Second, I considered the situation where
PNUE would stay constant or decrease, and soil nutrient levels would decrease. It
appeared that, if soil nutrient concentration is constant and PNUE decreases, the only
emerging pattern was from mycorrhizal (M) to non-mycorrhizal (NM) condition,
independent on the kinetics of nutrient uptake (Fig. 2a–c). If both the soil nutrient
concentration and PNUE decrease, several patterns may emerge depending on the nutrient
uptake kinetics of the roots. Qualitatively similar results were obtained when PNUE was
assumed to stay constant with decreasing nutrient levels. Nevertheless, in all cases PNUE
should be relatively high to favour the mycorrhizal condition (I).
From these results the possible patterns along altitudinal gradients were deduced
(arrows in Fig. 2). First, I considered the situation when only PNUE would decrease and
soil nutrient concentration remained constant. Second, I considered the situation where
PNUE would stay constant or decrease, and soil nutrient levels would decrease. It
appeared that, if soil nutrient concentration is constant and PNUE decreases, the only
emerging pattern was from mycorrhizal (M) to non-mycorrhizal (NM) condition,
independent on the kinetics of nutrient uptake (Fig. 2a–c). If both the soil nutrient
concentration and PNUE decrease, several patterns may emerge depending on the nutrient
uptake kinetics of the roots. Qualitatively similar results were obtained when PNUE was
assumed to stay constant with decreasing nutrient levels. Nevertheless, in all cases PNUE
should be relatively high to favour the mycorrhizal condition (I).
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