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[1]ZHANG Binyan,XIONG Donghong,LIU Lin,et al.Spatial and Temporal Variability of Soil Moisture in Gully Bed of Dry-Hot Valley[J].Research of Soil and Water Conservation,2023,30(01):83-90.[doi:10.13869/j.cnki.rswc.2023.01.002]

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Spatial and Temporal Variability of Soil Moisture in Gully Bed of Dry-Hot Valley

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 01 Page number: 83-90 Column: Public date: 2023-01-10

Title:: Spatial and Temporal Variability of Soil Moisture in Gully Bed of Dry-Hot Valley

Author(s):: ZHANG Binyan^1,2, XIONG Donghong¹, LIU Lin¹, TANG Yongfa^1,3, ZHANG Baojun¹, LI Xiaoying²; (1.Key Laboratory of Mountain Surface Hazards and Earth Surface Process, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences and ministry of Water Resources, Chengdu 610041, China; 2.College of Ecology and Environment, Southwestern Forestry University, Kunming 650224, China; 3.College of Water Conservancy and Hydropower Engineering, Sichuan Agricultural University, Ya'an, Sichuan 625014, China)

Keywords:: soil moisture; spatial and temporal variability; gully bed; dry-hot Valleys

CLC:: S152.7

DOI:: 10.13869/j.cnki.rswc.2023.01.002

Abstract:: A typical gully in the dry-hot valley of Yuanmou County was selected to study the spatiotemporal variation of soil moisture in the gully bed, and the soil moisture in soil layers of 10,20,30,40,60 and 100 cm from different plots(gully head, upstream, midstream and downstream)was monitored. The results showed that:(1)the water contents of all soil layers(except 100 cm soil layer)in different plots of the gully bed showed obvious characteristics of dry and wet seasons; the soil water contents during wet season(May to October)were high(7.64%～28.91%)and greatly influenced by rainfall, while those during dry season(November to April of the next year)were low(6.11%～11.97%);(2)the soil moisture from the gully head to the downstream of the gully bed decreased firstly and then increased in wet season, and the water content in the downstream(17.36%)was significantly higher than those in the gully head(15.46%)and the upstream(12.19%); in dry season, the soil moisture in the gully head(10.64%)was significantly higher than that in the upstream(6.74%)and downstream(9.10%); the water contents in the soil layers of 10—20 cm and 60—100 cm were higher both in dry and wet seasons, while those in the soil layers of 30—60 cm was low, and the most severe water deficit was observed in the 30 cm soil layer in dry season;(3)the max value of soil moisture in gully bed usually occurred in the month with the largest rainfall and the accumulated rainfall more than 76.1 mm within 7 days, and the min value usually occurred under continuous no rainfall conditions, such as from the end of dry season to the beginning of the rainy season with the occurrence of first effective rainfall(>2 mm). In conclusion, the soil water characteristics of dry and wet seasons, different positions of the stable gully beds and profile water distribution should be taken into account to select planting vegetation.

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Last Update: 2023-01-10