Effects of different grassland utilization patterns on plant community productivity and diversity in Jinyang County,Sichuan Province
In order to understand the impact of different grassland utilization patterns on species diversity and grassland productivity in Jinyang County,five types of grassland utilization patterns(grazing prohibition,grass-stock balance,artificial grassland,returning graz-ing to grassland,and no returning grazing to grassland)were studied in this paper.The results showed that there were 66 species which be-long to 23 families,55 genera in all the plots.The largest number of families,genera and species was found in grass-animal balance are-a,followed by the forbidden grazing plot,the returning grazing plot,the non-returning grazing plot and the artificial grass plot.Gramine-ae,Rosaceae and Leguminosae accounted for the largest proportions,which accounted for 36.65%,25.52%and 13.65%,respectively.The largest number of species was found in the grass-stock balance plot,but the smallest number was founded in the artificial grass plot.The number of species was significantly different in each grassland utilization patterns(P<0.05).There were significant differences in the vegetation coverage of the utilization patterns(P<0.05);the highest yield of grass was found in prohibited grazing plot.grass yield of re-turning grazing plot,artificial grass plot,grass-animal balance plot and non-grazing-grazing plot were decreased by 7.54%,43.50%,46.84%and 57.81%respectively,compared with the prohibited grazing plot.There were significant differences in grass yield among dif-ferent grassland utilization patterns(P<0.05).The effects of different grassland utilization patterns had significant effects on grassland pro-ductivity.
grassland use patternsvegetation coveragegrass yieldproductivityspecies diversity
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