Accurate determination of water-stable aggregates is of great significance for soil fertility

soilquality and soil erosion.Followed the three popular pre-wetting methods(no vacuum fast pre-wetting

novacuum fast dripping pre-wetting and no vacuum slow vapor pre-wetting)

the contents of water-stable aggregates of 5soil types(black soil

cinnamon soil

loess soil

purple soil and red soil)were measured.Basedon paired-sample t tests

the results showed that the measured contents were fairly stable with the samemethod but varied substantially with different methods.The method of no vacuum fast pre-wetting generatedthe lowest values

no vacuum fast dripping pre-wetting the moderate

and no vacuum slow vapor pre-wettingthe highest

which might be suitable respectively for the conditions of heavy rain storms

moderate rain andgentle rain.