Impact of different use patterns and degrees of grassland use on vegetation carbon storage in the Aba grassland pastoral area

For studying the influence of different use patterns and degrees on the carbon storage of grassland vegetation in the Aba pastoral area,the ground vegetation,litter and underground biomass were measured in grasslands with different use patterns(fenced mown grassland,artificial grassland,winter and spring grazing meadowland and summer and autumn grazing pasture)and different degrees of use in the growing season(winter and spring graze meadowland,summer and autumn mild grazed land,summer and autumn moderate grazed pasture and summer and autumn severe grazed land).1)In terms of use pattern,the carbon storage of aboveground vegetation on the fenced mown grassland,winter and spring grazed meadowland and artificial grassland was significantly(P0.05)higher than those on the summer and autumn grazed pasture.In terms of degree of use in the growing season,winter and spring grazed meadowland and summer and autumn mild grazed land was significantly(P0.05)higher than summer and autumn severe grazed land and summer and autumn moderate grazed pasture.2)Differences in the carbon storage of litter was not significant.3)In use patterns,the total carbon storage of roots on the summer and autumn grazed pasture and fenced mowing grassland was significantly higher than those on the winter and spring grazed meadowland and artificial grassland.In degree of use in the growing season,summer and autumn moderate grazed pasture and summer and autumn mild grazed land was significantly higher than summer and autumn severe grazed land and winter and spring grazed meadowland.The carbon storage of roots significantly decreased downward from the surface.The carbon storage of roots from 0 to 10cm was more than 65% of the total,while from 10 to 30cm there was no significant difference.In terms of use pattern,the carbon storage of grassland vegetation appeared as fenced mown grassland(356.509g/m2)winter and spring grazed meadowland(297.780g/m2)artificial grassland(164.953g/m2)summer and autumn grazed pasture(137.577g/m2),and the carbon storage of ground vegetation was 15.334,17.130,9.167and 5.146times respectively of the carbon storage of underground roots.In terms of use in the growing season,winter and spring grazed meadowland(297.780g/m2)summer and autumn mild grazed land(217.002g/m2)summer and autumn severe grazed land(113.849g/m2)summer and autumn moderate grazed pasture(81.882g/m2),and the carbon storage of ground vegetation was 17.1304,8.636,4.412 and 2.430 times respectively of the carbon storage of underground roots.The results showed that use pattern and grazing intensity are important factors influencing carbon storage of grassland vegetation.