Effects of Altitudes on Grassland Plant Diversity and Biomass——Taking Burjin Forest Region as an Example
This study focused on the effects of different altitude gradients on plant diversity and aboveground bio-mass of grassland in Burjin forest region.The results showed that:① The species composition and dominant spe-cies of grassland plant communities were different at different elevations.The highest plant diversity was found at altitude Ⅲ,while the lower and higher elevations were lower,indicating that the environmental conditions in the middle elevations were more suitable for increasing plant diversity.② The importance value of Festuca rubra was the highest at low altitude.Poa annua was dominant at middle altitude,and Ranunculus japonicus was the domi-nant species at high altitude.③ It was found that Margalef index,Shannon-Wiener index,Simpson index and Ala-talo index reached the maximum at the middle altitude,and then gradually decreased with the altitude.④ Mar-galef index,Shannon-Wiener index and Simpson index were positively correlated with above-ground biomass,while Alatalo index was weakly correlated.This study reveals the complex effects of altitude gradient on the eco-logical function of plant communities,which provides important scientific basis for ecosystem management and protection.These findings not only help to understand the mechanism of plant diversity change under different en-vironmental gradients,but also provide scientific support for the conservation and management of grassland eco-systems.
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