Studies On Biodiversity And Functional Diversity On Different Disturbance In Alashan

The four kinds of different disturbance were selected in Alashan Desert of Inner Mongolia in 4、 7、10 month from 2012-2014.which are a farmland area, a rotational-grazing area, a over-grazing area and a prohibited-grazing area.rodent communities were sampled by a day-trap method in four different disturbance, functional diversity of rodent community were analyzed by FDiversity softwere. The result shows that:(1) The dominance species:the dominance species of rodent community had significant changes at 4 different disturbance, phodopus roborovskii were the dominance species of over-grazing area in 2012, Meriones meridianus were dominance species of over-grazing area in 2013 and 2014. Meriones meridianus were dominance species of prohibited-grazing area in 2012 and 2014, Allactaga sibirica were dominance species of prohibited-grazing area in 2013. Dipus sagitta were dominance species of rotational-grazing area in 2012 and 2014, Meriones meridianus were dominance species of rotational-grazing area in 2013. Meriones meridianus were dominance species in farmland area in 3years.(2) Species diversity:species richness index showed following trends:forbidden grazing area>rotational grazing area >over-grazing area=farmland area .the size of shannon-wiener index and species’evenness showed significant different among studies sites (p<0.05), shannon-wiener index showed following trends:forbidden grazing area >rotational grazing area=over-grazing area>farmland area and species’evenness showed following trends:forbidden grazing area >over-grazing area >rotational grazing area>farmland area.(3) functional trait of rodent species:The response of functional trait is significant different between different disturbance (p<0.05), and there are variations between different years. Overall the number of rodents in small or medium size, short-lived (less than 2 years), long breeding time (over five months), long number of reproductive generation (Reproduction more than twice a year) in farmland area was significantly higher than the other three disturbance (P<0.05), while the number of rodent in above average size, long-lived(over 2 years), short breeding time(2-3 months), short number of reproductive generation (reproduction 1 year) in prohibited-grazing area and rotational-grazing area were significantly higher than the farmland area (P<0.05), but there is no significant different with over-grazing(P> 0.05).(4) Functional diversity of rodent species: The functional diversity were difference between years under different disturbance, functional richness index: farmland area had reduced functional richness index in 3 years, functional evenness index:functional evenness index in prohibited area and rotational grazing area is significance higher than over-grazing area and farmland area in 2012-2013(p<0.05),there were no significance different between 4 disturbance in 2014(p>0.05).functional divergence index:functional divergence index in prohibited area is significance higher than the other three disturbance (p<0.05)in 2012,functional divergence index in farmland area is significance lower than over-grazing area and rotational grazing area (p<0.05) in 2013,functional divergence in farmland area is significance lower than prohibited area (p<0.05) in 2014,functional divergence in farmland area is keep lowest in three years.(5) The relationship between species diversity and the functional diversity: Functional richness, functional evenness were significant correlated with species richness and shannon-wiener index (P<0.001).functional divergence were significance correlated with species richness and shannon-wiener index (P＜0.05). functional richness、functional evenness and functional divergence were significance correlated with each other (P<0.001).