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[1]Wan Haixia,Xu Hao,Wang Yueling,et al.Anti-scouribility of Three Herbaceous Root-Soil System and Its Relationship with Influencing Factors in Loess Hilly Region of Southern Ningxia[J].Research of Soil and Water Conservation,2024,31(03):115-127.[doi:10.13869/j.cnki.rswc.2024.03.012]

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Anti-scouribility of Three Herbaceous Root-Soil System and Its Relationship with Influencing Factors in Loess Hilly Region of Southern Ningxia

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 31 Number of periods: 2024 03 Page number: 115-127 Column: Public date: 2024-04-30

Title:: Anti-scouribility of Three Herbaceous Root-Soil System and Its Relationship with Influencing Factors in Loess Hilly Region of Southern Ningxia

Author(s):: Wan Haixia¹, Xu Hao¹, Wang Yueling¹, Han Xinsheng¹, Dong Liguo¹, Guo Yongzhong¹, An Yu¹, Jia Tingmin²; (1.Institute of Forestry and Grassland Ecology, Ningxia Academy of Agricultural and Forestry Sciences, Yinchuan 750002, China; 2.Ningxia Jinjiping Ecological Leisure Agriculture Development Co., Ltd., Pengyang, Ningxia 756500, china)

Keywords:: soil; erosion; herbaceous root-soil system; anti-scourability; root

CLC:: S157.1

DOI:: 10.13869/j.cnki.rswc.2024.03.012

Abstract:: [Objective] The aims of this study are to clarify the anti-scourability difference of three herbaceous root-soil system and its relationship with influencing factors in the loess hilly region of southern Ningxia, and to provide a theoretical basis for improving the quality of ecological construction and optimizing the allocation of vegetation in the study area. [Methods] The common herbaceous root-soil system of Thymus mongolicus, Potentilla acaulis and Stipa bungeana were taken as research objects of the study area. The indoor undamaged soil trench scouring tests was carried out. LA-S root sanning analysis system was used to study the anti-scourability of different herbs root-soil system in 0—15 cm soil layer and their relationship with root and soil. [Results](1)The anti-scourability of three herbaceous root-soil system in 0—15 cm soil layer decreased in the order: Potentilla acaulis(53.7 L·h/g)>Thymus mongolicus(36.5 L·h/g)>Stipa bungeana(14.2 L·h/g). Potentilla acaulis root-soil system anti-scourability was the strongest.(2)The average root length density, surface area density, volume density and specific root length of three herbaceous root-soil system in 0—15 cm soil layer were 4.25～10.56 cm/cm³, 42.95～111.51 mm²/cm³, 5.04～17.94 mm³/cm³, 35.06～67.96 m/g, respectively. The root length density and other parameters of Thyme mongolicus were significantly larger than other herbs.( 3 )The organic carbon contents of three herbaceous root soils in 0—15 cm soil layer decreased in the order: Thyme mongolicus(1.437%)>Potentilla acaulis(1.290% )>Stipa bungeana(0.430% ). The root soil clay content of Thyme mongolicus was 1.14 times and 1.20 times that of Potentilla acaulis and Stipa bungeana. The soil aggregate parameters MWD, GMD, and R_>0.25 of three herbaceous were 13.80～18.23 mm, 7.15～11.11 mm, and 43.06%～70.05%, respectively. All above indicators of Potentilla acaulis was the largest.(4)Root and soil could directly or indirectly, individually or jointly affect anti-scourability of three herbaceous root-soil system. Clay, silt, sand and aggregates of Thyme mongolicus soil directly affected soil anti-scourability, and most of its roots indirectly affected soil anti-scourability by affecting soil mechanical composition and organic carbon content. Soil silt and most fine roots of Potentilla acaulis directly affected soil anti-scourability, and 0～0.5 mm roots, soil clay and sand also indirectly affected anti-scourability by affecting soil aggregates. Soil sand and 0～1.0 mm roots of Stipa bungeana directly affected soil anti-scourability, and its specific fine roots also indirectly affected anti-scourability by affecting soil aggregates and organic carbon content. [Conclusion] There are obvious differences in the anti-scourability of the three kinds of herbaceous root-soil system. Roots and soil can affect their anti-scourability. The anti-scourability of different herbaceous(vegetation)should be considered in the ecological construction in the loess hilly area of southern Ningxia, and the scientific configuration should be carried out on the basis of improving the relevant influencing factors.

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