Subjects: Biology >> Botany >> Applied botany submitted time 2022-07-05 Cooperative journals: 《广西植物》
Abstract： The response of arbuscular mycorrhizal fungi (AMF) colonization percentage to slope position and shrub species and the key influencing factors were identified as well in karst slopes, which is the prerequisite for rational utilization of soil AMF to promote karst vegetation restoration. Based on field investigation of typical shrub communities and environmental variables on slopes of a karst peak cluster depression catchment. The fine root samples of three typical shrub species (Vitex negundo, Alchornea trewioides and Pyracantha fortuneana) were collected from three positions (upper, middle and lower) along three slopes. The frequency, intensity and abundance of AMF colonization were detected and calculated by the Trypan blue method. The results were as follows: (1) The colonization frequency, colonization intensity and abundance of AMF for Vitex negundo and Alchornea trewioides were higher than those for Pyracantha fortuneana in the same slope. The colonization intensity for Vitex negundo and Pyracantha fortuneana in the lower slope was higher than that in the upper or middle slope. The abundance of AMF for Alchornea trewioides in the middle slope was significantly higher than that in the upper and lower slope (P<0.05). (2) Shrub species had significant effect on the colonization frequency, intensity and abundance of AMF, but slope position only had significant effect on the colonization intensity of AMF. Slope position and shrub species had significant interactive effect on the abundance of AMF (P<0.05). (3) Soil depth and total potassium content were identified as the two strongest explanatory factors on AMF colonization according to the redundancy analysis (P<0.05). Therefore, the rational use of soil AMF to promote vegetation restoration in karst areas needs to consider the choice of terrain and species, and should pay attention to the water and soil conservation.
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