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[1]WANG Yueyue,WU Yuanzhi,FAN Wenhua,et al.Characteristics of Soil Aggregates in Cultivated Layer of Yimeng Mountain Area Under Different Rainfall Conditions[J].Research of Soil and Water Conservation,2022,29(01):92-99.

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Characteristics of Soil Aggregates in Cultivated Layer of Yimeng Mountain Area Under Different Rainfall Conditions

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 29 Number of periods: 2022 01 Page number: 92-99 Column: Public date: 2022-02-20

Title:: Characteristics of Soil Aggregates in Cultivated Layer of Yimeng Mountain Area Under Different Rainfall Conditions

Author(s):: WANG Yueyue, WU Yuanzhi, FAN Wenhua, DING Wenxue, WEI Wei; (Shandong Provincial Key Laboratory of Soil and Water Conservation and Environmental Protection, School of Resources and Environment, Linyi University, Linyi, Shandong 276000, China)

Keywords:: Yimeng Mountain area; cultivated layer soil; rainfall duration; rainfall intensity; soil aggregate

CLC:: S152.4

DOI:: -

Abstract:: Rainfall intensity and rainfall duration are important factors affecting soil aggregates. However, less information is available for the effect of rainfall intensity and duration on soil aggregates characteristics in cultivated layer of Yimeng Mountain area. Soil aggregates in a cultivated layer in the Yimeng Mountain area were studied before and after various intensities(16 mm/h, 43 mm/h, 71 mm/h)and durations(10 min, 30 min, 60 min)of artificially simulated rainfall. The results showed that the rainfall with intensity of 16 mm/h and duration of 10 min caused a rapid decrease of the >5 mm aggregate content in the 0—5 cm soil layer; rainfall with intensities of 43 and 71 mm/h caused the microaggregate content of the 0—5 cm soil layer to initially increase and then to decrease; compared to the original soil condition, the >5 mm aggregate content decreased by 93% in the 0—5 cm soil layer, and the <0.25 mm aggregate content increased by 42% under the rainfall intensity of 71 mm/h for a duration of 60 min; the mean weight diameter(MWD)of soil aggregates declined as rainfall intensity and duration increased, and the MWD values of three soil layers(0—5 cm, 5—10 cm and 10—20 cm)tended to be similar under the rainfall intensity of 71 mm/h for 60 min. The above results indicate that the decomposition of soil macroaggregates was enhanced with the increase of rainfall intensity and rainfall duration, leading to gradual decrease in macroaggregate content and gradual increase in microaggregate content, and the soil stability first decreased and then tended to be stable.

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Last Update: 2022-02-20