Estimation of acorn production capacity using growth characteristics of Quercus acutissima in a clonal seed orchard

Figures & data

Figure 1. A diagram for measuring the crown volume.

Table 1. Growth characteristics of Quercus acutissima in the clonal seed orchard.

Plantation year	Tree age (grafted age)	No. of trees measured	Height (m)	Crown length (m)	Crown width (m)	Crown volume (m^3)
2005	9-year-old	150	4.69 ± 0.99^a	3.87 ± 0.91	2.74 ± 0.76	8.73 ± 5.77
1999	15-year-old	75	5.92 ± 1.83	5.47 ± 1.98	4.35 ± 1.71	37.70 ± 35.62

Note: ^aMean ± SD.

Table 2. Number of acorns per tree, capacity for acorn production, and characteristics of acorns in the clonal seed orchard of Quercus acutissima. The acorn bearing season is from July to August.

			Capacity of acorn production				Acorn
Plantation year	Tree age (grafted age)	Number of acorns/tree of current year	kg/tree	Number of trees/ha	kg/ha		Weight (g)	Length (mm)	Width (mm)	Volume (cm^3)
2005	9-year-old	287 ± 145^z	1.26 ± 0.84	320	403		4.26 ± 0.77a*	19.9 ± 1.50a	18.1 ± 1.2a	3.49 ± 0.55b
1999	15-year-old	599 ± 464	2.71 ± 2.14	180	486		4.52 ± 0.84a	20.2 ± 0.92a	18.4 ± 1.5a	3.85 ± 0.69a

Note: ^zMean ± SD; *Different letters indicate statistical differences at P = 0.05.

Figure 2. Relationship between number of acorns and crown characteristics of 9-year-old Quercus acutissima trees in the clonal seed orchard. The dots represent the mean values of the clones (n = 75).

Figure 3. Relationship between number of acorns per tree and crown characteristics of 15-year-old Quercus acutissima in a 99 clonal seed orchard (n = 150).