extremely significantp < 0.001
From Figure 8 , it can be concluded that in April 2022, the number of female cones had a significant negative correlation with the K content in November 2021 ( p < 0.05, r = −0.46), a very significant negative correlation with the N content in July 2022 ( p < 0.01, r = −0.51), a significant negative correlation with the K content in July 2022 ( p < 0.05, r = −0.40), a significant positive correlation with the C:N ratio in July 2022 ( p < 0.05, r = 0.38), and an extremely significant negative correlation with the K content in November 2022 ( p < 0.001, r = −0.62).