Early detection of pine wilt disease in Pinus tabuliformis in North China using a field portable spectrometer and UAV-based hyperspectral imagery

Forest Ecosystems

Table 1 Statistics of three plots variables (tree numbers = 218)

	Mean	Standard deviation	Maximum	Minimum	Range
H (m)	12.66	1.12	14.50	9.60	4.90
DBH (cm)	21.79	5.40	34.06	7.83	26.23
CD (m)	2.13	1.22	7.80	0.80	7.00
Cab (g∙m⁻²)	299.30	165.93	560.00	0.00	560.00
WC (%)	42.13	14.45	68.32	17.25	51.07

H Tree height, DBH Diameter at breast height, CD Crown diameter, Cab Leaf chlorophyll content, WC Water content