Increasing temperatures over an 18-year period shortens growing season length in a beech (Fagus sylvatica L.)-dominated forest

Table 4 Correlation coefficients between leaf phenology and productivity dynamics indicators. Italicized values correspond to significant (p value < 0.05) correlations, and bold values to highly significant (p value < 0.01) correlations. See the first column for the definition of the abbreviations of the first line

	LO _S	LO _L	LO _E	LF _S	LF _L	LF _E	L _L	CUI _S	CUI _L	CUI _E	CUD _S	CUD _L	CUD _E
Leaf out start (LO_S)
Leaf out length (LO_L)	− 0.37
Leaf out end (LO_E)	0.72	0.38
Leaf fall start (LF_S)	0.42	0.15	0.54
Leaf fall length (LF_L)	0.13	− 0.28	− 0.09	− 0.15
Leaf fall end (LF_E)	0.43	− 0.09	0.36	0.66	0.64
Leafed period length (L_L)	− 0.37	− 0.24	− 0.55	0.41	− 0.08	0.25
Carbon uptake increase start (CUI_S)	0.54	− 0.12	0.44	0.39	− 0.11	0.21	− 0.11
Carbon uptake increase length (CUI_L)	− 0.28	0.28	− 0.07	− 0.28	0.01	− 0.19	− 0.17	− 0.88
Carbon uptake increase end (CUI_E)	0.54	0.32	0.77	0.23	− 0.20	0.04	− 0.59	0.26	0.22
Carbon uptake decrease start (CUD_S)	0.59	− 0.20	0.43	0.79	− 0.18	0.47	0.30	0.46	− 0.27	0.40
Carbon uptake decrease length (CUD_L)	− 0.46	0.08	− 0.38	− 0.68	0.40	− 0.23	− 0.26	− 0.33	0.09	− 0.51	− 0.89
Carbon uptake decrease end (CUD_E)	0.28	− 0.25	0.10	0.22	0.47	0.51	0.09	0.26	− 0.39	− 0.25	0.21	0.25
Carbon uptake length (CU_L)	0.42	− 0.35	0.15	0.76	− 0.12	0.50	0.58	0.39	− 0.39	0.01	0.92	− 0.76	0.34

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