A Method to Select Plus Tree for Flower Purpose in Forestry
Phung Dinh Trung
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam.
Tran Duc Manh
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam.
Nguyen Toan Thang
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam.
Dang Van Thuyet
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam.
Dao Trung Duc
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam.
Mai Thi Linh
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam.
Nguyen Van Tuan
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam.
Nguyen Thi Thu Phuong
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam.
Ninh Viet Khuong
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam.
Tran Hoang Quy
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam.
Tran Cao Nguyen
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam.
Dang Thi Hai Ha
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam.
Vu Tien Lam
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam.
Nguyen Huu Thinh
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam.
Hoang Thanh Son
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam.
Trinh Ngoc Bon
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam.
Ho Trung Luong
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam.
Ly Thi Thanh Huyen
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam.
Hoang Van Thanh
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam.
Vu Van Thuan
Centre for Applied Silviculture Research and Extension, Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam.
Tran Van Do *
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam.
*Author to whom correspondence should be addressed.
Abstract
Plus tree selection is the first step to improve production and quality in forestry. An individual-based method is widely used to select plus trees for timber production, timber form, freedom from diseases and insects. In this study, a method to select plus trees for flower production is described and named as a crown-area-based method. Both individual-based and crown-area-based methods were used to select plus trees for Camellia impressinervis, a golden camellia; its yellow flowers have been used to treat sore throat and diarrhea, and to prevent cancers in China and Vietnam. Flower production of 21 concerned individuals was compared to the population mean and it was generated as a percentage. The population mean of the individual-based method is the mean of production of 21 trees as mean production/tree. While population mean of the crown-area-based method is mean production/m2 crown area (first production/m2 crown area for each tree was generated, then mean for population). The results indicated that both methods show seven individual trees with flower production >100% population mean. However, individual trees are different. Only five of 7 trees are the same in both methods. The tree rankings by flower production percentage in both methods are totally different. The highest ranking by individual-based method (310% mean) is 4th ranking by crown-area-based method (181% mean). While the highest ranking by crown-area-based method (270% mean) is third ranking by individual-based method (260% mean). It is concluded that crown-area-based method is better in selecting plus trees for flower purpose, as it considers the crown area which is known as a productive part of a tree to form flowers.
Keywords: Crown-area-based method, flower production, golden camellia, individual-based method, population mean.