Table 1.
Characteristics of red pine needle samples

Sampling Date	Needle Class	Needle Color with Naked Eye	Sample Name	Number of standing trees
2019.11.06	Intact	Green	G10	3
2019.11.06	Senescent	Yellowish-green	Y10	3
2019.11.06	Litter	Brown	B10	3
2019.11.06	Intact	Green	G20	3
2019.11.06	Litter	Brown	B20	3
2019.11.06	Intact	Green	G30	8
2019.11.06	Senescent	Yellowish-green	Y30	8
2019.11.06	Litter	Brown	B30	8
2020.01.22	Intact	Green	G31	8
2020.01.22	Senescent	Yellowish-green	Y31	8
2020.01.22	Litter	Brown	B31	8
2020.01.31	Intact	Green	G32	8
2020.01.31	Senescent	Yellowish-green	Y32	8
2020.01.31	Litter	Brown	B32	8