Pollen Ultrastructure of Pentaphylacaceae and Sladeniaceae and Their Relationships to the Family Theaceae;

Based on a 2×2 contingency table,interspecific association of 13 main tree populations of the montane elfin forest in shimentai Nature Reserve,Guangdong Province,was studied using variance ratio(VR),~2 text,association coefficient(AC),percentage of co-occurrence(PC),and Pearson r correlation coefficient.

Using the methods of t-test of s~(2) ratio,negative binomial parameter K,mean crowding index,patchiness index,Morisita index and the method of nearest neighbor,the spacial distribution patterns of the main tree populations in montane forest in Caiyanghe nature reserve were studied.

The niche breadths and overlaps of 20 main tree populations in the evergreen broad-leaved forest in Simian Mountain, were measured by using the formulas described by Levins ,Hurlbert and PianKa ,and the relationships among niche breadth, niche overlap and interspecific association were discussed in this paper.

Interspecific association of the main shrub population in the Gymnosphaera podophylla community at Jiulong Lake water-conservation forest,Zhaoqing city;

Niche characteristics of main shrub populations in the arid valley of the Minjiang River,southwestern China.;

In this paper,the spatial pattern for 4 main shrub populations in Wulanbuhe Desert,Inner Mongolia was studied by using the semivariogram in Geostatistics.

Analyses of the dynamic state of Erythrophleum fordii population;

The characteristics of the height structure of Bruguiera gymnorrhiza population in National Shankou Mangrove Nature Reserve were studied by measuring the fractal dimension of height contour.