Estimating gap age using tree-ring width in combination with carbon isotope discrimination in a temperate forest, Northeast China

Table 3 Effects of year and individual tree on the percent growth change of rings in the sample and control trees

Species	Effect	Sample trees		Control trees
Species	Effect	df	p	df	P
Ulmus laciniata	Year	13	0.023	13	0.023
Ulmus laciniata	Individual tree	8	0.536	8	0.634
Fraxinus rhynchophylla	Year	13	0.047	13	0.021
Fraxinus rhynchophylla	Individual tree	7	0.196	7	0.374
Juglans mandshurica	Year	13	0.012	13	< 0.001
Juglans mandshurica	Individual tree	6	0.231	6	0.431

ISSN: 1297-966X