3.3.2 Spore density, species abundance and diversity index of AM
fungi
The highest AM fungal spore
density was found in the MN treatment with 40.13 spores
g-1 (Table 5), followed by the HN and LN treatments
with 36.9 and 36.43 spores g-1, and the lowest 35.27
spores g-1 in CK. With increasing N addition
concentration, the species abundance of AM fungi gradually decreased,
with a significant decrease in the LN and MN treatment (P<0.05), and there were only 8 species g-1 in
the HN treatment. All AM fungal species diversity differed significantly
in the N addition treatment compared to the CK, both Simpson’s index and
Shannon’s index were highest in the CK, the LN treatment was
significantly lower compared to the CK and MN treatments, while the HN
treatment had the lowest diversity index.