Table 6.

Average nutrient contents of leaves in Japan reported by previous studies

Family	Species	Location (Prefecture)	Nutrient content of leaves (%)			Reference
			K+	Mg2+	Ca2+
Fagaceae	Quercus serrata	Kyoto	0.90	0.17	0.90	*Katagiri (1996)
	Quercus crispula		1.11	0.21	1.68
	Fagus crenata		0.73	0.21	0.86
	Castanea crenata	Shimane	0.93	0.34	0.85	†Katagiri (1977)
	Quercus serrata		0.66	0.37	1.46
			0.87 (0.18)	0.26 (0.09)	1.15 (0.39)
Cupressaceae	Cryptomeria japonica	Akita	0.48	0.21	1.39	‡Tsutsumi (1965)
		Nara	0.58	0.14	0.69
			0.42	0.17	0.95
			0.70	0.28	0.56
			0.50	0.24	0.88
			0.35	0.20	0.58
			0.51 (0.12)	0.21 (0.05)	0.84 (0.05)

Values in parentheses are standard deviations

^*Katagiri, S. (1996). V. Material production and nutrient cycling in various forest ecosystems. In Iwatsubo, G (Ed.), Modern Forestry 12 Forest ecology, (pp. 189–293). Tokyo: Buneido Publishing Co., Ltd

^†Katagiri, S. (1977). Studies on mineral cycling in a deciduous broad-leaved forest at Sanbe forest of Shimane university (IV) Concentration of nutrient elements of trees. Bulletin of the Faculty of Agriculture, Shimane University, 11, 60–72

^‡Tsutsumi, T. (1965). Amount of nutrients in trees of Cryptomeria japonica. Transactions of the meeting of the Japanese Forestry Society, 47, 105–108