(2) With the continuous increase in grazing intensity, the alpine swamp meadow showed a trend toward gradual transformation from macro aggregate to micro aggregate; moderate and severe grazing activities significantly reduced the proportion of >1-mm-sized particles of macro aggregates in the soil; and the proportion of < 0.05-mm-sized particles in microaggregates trended toward a gradual increase.
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Effects of grazing on the allocation of mass of soil aggregates and aggregate-associated organic carbon in an alpine meadow.
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Other studies have also shown that the soil organic carbon content increases first and then decreases gradually[ 24 ], or they have showen a decreasing trend [ 25 ] or a gradual increase [ 26 ] with the increase in grazing intensity in typical grassland areas; Some grazing experiments also confirmed that grazing has no significant effect on the content of organic carbon in soil aggregates with different particle sizes [ 27 ].