《Table 4 Mass water content of soil in May 2018(partly)》

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《陇东黄土高原中沟小流域土壤水分实测数据集（2018）》

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During the growing season from May to October，the soil moisture of Robinia pseudoacacia plantations with different densities is showed as follows（Tables 3，4）:1，600 trees/hm2（18.75%）>2，196 trees/hm2（15.93%）>750 trees/hm2（15.92%）>4，563 trees/hm2（11.87%）.Soil moisture in different topographic locations:soil moisture was the best for the Robinia pseudoacacia forest in the tableland surface（upper），in the middle for the Robinia pseudoacacia forests in the tableland surface（lower）and the ditch，and the worst for the Robinia pseudoacacia forest in the beam.As far as slope aspect was concerned，soil moisture was the best in shady slope，followed by the semi-shady slope and sunny slope，and was the worst in semi-sunny slope.As far as the vertical variation of soil moisture was concerned，soil moisture was usually the largest in the surface layer，decreased with the deepening of the soil layer and then tended to be stable.For different topographic locations，the variation coefficient of soil moisture between different layers for Robinia pseudoacacia forest on the tableland（upper）was the smallest，with the soil moisture relatively stable，followed by Robinia pseudoacacia forests on the tableland surface（lower）and on the gully，and was the largest for the Robinia pseudoacacia forest on the beam，with a rapid variation layer reaching 90 cm.For the slope direction:the change of soil moisture in sunny slope and semi-sunny slope was more active than that in shady slope and semi-cloudy slope，in which the sunny slope was more stable than the semi-sunny slope and the shady slope was more stable than the semi-cloudy slope[17].