1. On the basis of quadrat investigation of Davidia involucrata community, structure and species diversity of the community were analyzed in Baiguo forest farm of Wuxi county.

2. Based on the line investigation and the quadrat investigation, species multiplicity in Guizhou Litchi karst secondary forest were studied.

3. The dynamics of spatial distribution pattern of plant population has also been monitored with improved method of quadrat variance.

4. Compared to variance-mean ratio, nearest-neighbor method is neither influenced by the size of quadrat nor by the shape of plot.

5. The transect sampling technique is most often used in plant ecology to study changes in the composition of vegetation. See also quadrat.

6. To investigate and study on community characteristeristics of herbaceous plant in Shuangqiao reservoir, village Baohua of Shuicheng county, Quadrat sampling method was used.

7. In addition, the importance values of the constructive species, P. lasiocarpa, is the maximum in the tree layer, especially in the quadrat 3.

8. By means of compound factors test and three factors quadrat orthogonal test design, the new flour gluten fortifier were studied.