Small-scale vegetation dynamics in semi-arid steppe in Inner Mongolia |
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| Authors: | Wei Zhang Christina Skarpe |
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| Institution: | aDepartment of Ecological Botany, Uppsala University, Villavägen 14, S-752 36, Uppsala, Sweden;bNorwegian Institute for Nature Research, Tungasletta 2, N-7005, Trondheim, Norway |
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| Abstract: | Small-scale vegetation dynamics were followed for ecotones and in uniform stands inArtemisia-dominated steppe vegetation under grazing and when recovering from heavy grazing. Species composition was followed annually for 5 years in 1 m2and 0·25 m2plots for (1) presence–absence; (2) density; and (3) biomass.More rapid vegetation dynamics, in terms of change of type of vegetation and distance moved in DCA species space between sampling occasions, were observed in smaller plots and in early seral stages, where species were few and alpha diversity low. Only the plots recently protected from grazing showed a directional vegetation change; those protected for more than 3 years and those under continued grazing showed, at this scale, non-directional dynamics. |
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| Keywords: | Artemisia ecotones biomass density grazing patch dynamics steppe semi-arid |
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