Abstract:
This study investigated the concentrated distribution area of
Taxus cuspidata Sieb.et Zucc. in Duhuangzi forest farm, Wangqing County, Jilin Province, China. Based on variance ratio (
VR), Ochiai index (
OI), and Spearman rank correlation coefficients, the interspecific associations of three communities were analyzed, including spruce-fir forest (community 1), spruce-fir forest (community 2), and birch forest (community 3). Results showed that the
VR values of the three communities were all less than 1, and the main species in community 3 showed a significant negative correlation, while the other two communities showed no significant negative correlation. Based on
OI, the species with high correlation (0.6 <
OI ≤ 1) in communities 1 and 2 accounted for a higher proportion than that in community 3. Average
OI between
T.cuspidata and major tree species decreased from community 1 to 3. Based on Spearman rank correlation coefficients, most species showed no significant correlation. Only the positive and negative correlation ratio of community 1 was greater than 1. The overall association between species in the spruce-fir forest was relatively close and stability was high, while the situation in the birch forest showed the opposite pattern.