The application relates to a
root system distribution imaging
contrast medium, a preparation method, an in-situ imaging
system and a method, belongs to the field of ecological restoration and protection, and is characterized in that the
contrast medium is mixed by a composite
growth hormone, a dissolving agent, a tracer and a
solvent; the in-situ imaging
system comprises emitting devices for emitting
neutron beams to
plant root systems, receiving devices for receiving the
neutron beams, imaging devices for converting the received
neutron beams into images, and two drilling pipes for drilling, each of the drilling pipes comprises a hollow
pipe with a top opening and a
drill bit arranged at the bottom of the hollow
pipe, a positioning structure is arranged in the hollow
pipe, and the positioning structure comprises a positioning chuck and a guide pipe arranged on the upper surface of the positioning chuck. The application can effectively adapt to the
topography of mountainous areas, eliminate the environmental influence of mountainous areas, and improve the three-dimensional imaging precision and efficiency of the
neutron radiation in-situ testing technology for the
root system distribution of plants in mountainous areas.