Discussion
Our results showed that the N absorption capacity of the degraded alpine
meadow was higher than that of the undegraded alpine meadow. N source
preferences at the community level differed between the degraded and
undegraded alpine meadows, and the N source preference also differed
substantially between generalist and unique species. Exist a general
shift from NO3- to glycine preference
in pass from non-degraded to degraded meadow at community level, whereas
at species level we observed that species that are present in both
non-degraded and degraded meadow we observed that some species did not
change its preferences and other changed it. Thus, the clear changes at
community level in N uptake preferences are due to both; some species
change in N uptake preferences and also to species turn-over.