Species Distribution Pattern And Habitat Correlation Of The Evergreen Broad-leaved Forest In Wuyi Mountains

Wuyi Mountains are located in the eastern China, which stored in the typical subtropical original natural forest ecosystems in the world. This study used diversity index, spatial structure parameters and Torus-translations test to analysis the spatial distribution pattern and habitat correlation of the subtropical evergreen broad leaved forest in Wuyishan Mountains. The results summarized as follows:(1) Simpson, Shannon-Weiner and Pielou's evenness index are related with scale, and showed strong regional distribution characteristics. The spatial distribution difference of species diversity is getting smaller and smaller when the spatial scale shifting from small to large scale.Because of the average effects, many salient spatial differences have been completely ignored.(2) The types of habitats in the sample plots were varied, Alpha diversity index like Simpson index showed strong regional distribution characteristics. Meanwhile, compared with Simpson and Pielou index, Shannon-Weiner index is more suitable for the study of the diversity in Wuyi Mountains.(3) Spatial distribution pattern of the tree layer in the forest dynamics plot was mainly dominated by random distribution; the plot had high mingling degree of tree species; and the whole forest was in moderate state of growth. Additionally, only between uniform angle index and mingling degree had a significant negative correlation, indicating that the higher mingling degree of tree species, the greater the species diversity.(4) For these 10 dominant species, heliophiles such as Schima superba, Castanopsis eyrie had certain growth advantages in the upper tree layer; while sciophiles such as Syzygium buxifolium and Eurya muricata propagated widely in the lower tree layer, and occupied favorable positions. This changing structure of the distribution greatly contributed to the stability of community in this area. Moreover, young and mid-aged trees were predominantly distributed in this plot; this might suggest that the plot was in the middle or later stages of succession.(5) After the 171 tree species had been examined by Torus-transtration test in this plot, the result showed that only 21.6% of the tree species have strong selectivity to habitat. Species which had significant positive correlations with habitats were found in valleys and gentle slopes, and the negative species were more related with the valley. At the same time, the positive and negative correlation was no significant difference between steep slopes and ridges.(6) Habitat partitioning which is dominated by terrain has become one of the important mechanism which allowed the coexistence of evergreen broad-leaved trees in Wuyi Mountains.Because most of them are shade tolerant plants, and like the shade wet environment, except Rhododendron ovatum, all species which are in valley habitat had large populations. Conversely,species such as Castanopsis fargesii, Tarenna acutisepala were more inclined to the ridge.