River ecological naturalness evaluation method based on river-related organisms and habitat quality

The invention discloses a river ecology naturalness evaluation method based on river-related organisms and habitat quality. River evaluation indexes including three evaluation factors of river, namely water quality, river environment and river-related organisms are selected; nine types of evaluation indexes including a water quality level, a riverway bank zone form, a bank slope vegetation coverage degree, a large benthic invertebrate naturalness degree, a zooplankton naturalness degree, a phytoplankton naturalness degree, a fish naturalness degree, an amphibian naturalness degree and a wading bird naturalness degree are scored, weighted scoring is carried out according to the obtained scores of the nine types of evaluation indexes, a value of the river ecological naturalness N is obtained, and then the river ecological naturalness is judged to be in the five grades of excellent, good, mild degradation, moderate degradation and severe degradation according to the value N. The invention provides a comprehensiv