Simulated soil erosion stress effect on physiological and growth characteristics in shrubs at coal mining subsidence area
[Objective]To explore the effects of soil erosion stress caused by coal mining activities in semi-arid areas on the growth and physiological characteristics of Salix psammophila and Caragana microphylla,and to clarify the adaptability and survival strategies of plants under stress.[Method]In this study,in-situ root fracture experiments were carried out on the roots of S.psammophila and C.microphylla to simulate soil erosion stress under field in-situ test conditions.Four different degrees of soil erosion were set up,including control group(CK)and mild stress(S1),moderate stress(S2)and severe stress(S3).The changes of growth indexes and physiological indexes of the two shrubs under different stress treatments were measured,and their stress resistance was comprehensively evaluated by using fuzzy mathematics membership function.[Result]The soil erosion decreased significantly the height,canopy size,branch length and branch diameter with the increasing of the soil erosion stress.The chlorophyll content of S.psammophila leaves decreased with the increase of soil erosion stress,and the stress time gradually decreased,while the chlorophyll content of C.microphylla recovered to the early stage of erosion stress in the later stage of stress.The malondialdehyde content of S.psammophila decreased first and then increased with the prolongation of stress time,while the malondialdehyde content of C.microphylla increased first and then decreased.The activities of superoxide dismutase,peroxidase and catalase in leaves of S.psammophila and C.microphylla increased at the late stage of erosion stress.The membership function analysis showed that in the soil erosion environment,the stress resistance of C.microphylla was the strongest,followed by S.psammophila.[Conclusion]C.microphylla has better resistance and resilience to the damage effect of soil erosion in coal mining subsidence area,and is more suitable for ecological restoration and vegetation construction in arid and semi-arid mining areas.
Salix psammophilaCaragana microphyllamining subsidence areasoil erosion stressphysiological and growth characteristics
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