Table 1.

Data of Pearson correlation analysis for two weather facts and 12 groups of metabolites in North Carolina.

		Temperature	Daily precipitation	Monoterpene	Sesquiterpene	Diterpene	Triterpene	Benzene	PAH	Nicotine	Amino acid	Organic acid	Sugar	NCSM	Polyphenol
Temperature	Pearson correlation	1	0.225	0.057	0.556*	0.582*	0.767**	−0.519	−0.465	−0.855**	−0.119	−0.655*	−0.855**	−0.092	−0.176
	Sig. (two-tailed)		0.439	0.847	0.039	0.029	0.001	0.057	0.094	0	0.685	0.011	0	0.754	0.547
Daily precipitation	Pearson correlation	0.225	1	−0.328	0.194	0.08	0.553*	0.115	−0.106	−0.216	−0.032	0.16	−0.356	−0.309	−0.206
	Sig. (two-tailed)	0.439		0.252	0.507	0.786	0.040	0.695	0.719	0.458	0.914	0.584	0.212	0.283	0.480
Monoterpene	Pearson correlation	0.057	−0.328	1	−0.338	0.478	0.226	−0.747**	−0.33	−0.462	0.13	−0.376	−0.169	0.710**	0.819**
	Sig. (two-tailed)	0.847	0.252		0.237	0.084	0.436	0.002	0.249	0.096	0.657	0.186	0.565	0.004	0
Sesquiterpene	Pearson correlation	0.556*	0.194	−0.338	1	0.017	0.25	−0.009	−0.443	−0.357	0.099	−0.206	−0.511	−0.105	−0.285
	Sig. (two-tailed)	0.039	0.507	0.237		0.955	0.39	0.976	0.112	0.211	0.737	0.479	0.062	0.72	0.324
Diterpene	Pearson correlation	0.582*	0.08	0.478	0.017	1	0.722**	−0.604*	−0.222	−0.775**	0.267	−0.591*	−0.532	0.361	0.255
	Sig. (two-tailed)	0.029	0.786	0.084	0.955		0.004	0.022	0.446	0.001	0.356	0.026	0.05	0.205	0.379
Triterpene	Pearson correlation	0.767**	0.553*	0.226	0.25	0.722**	1	−0.571*	−0.388	−0.835**	0.104	−0.491	−0.752**	0.083	0.106
	Sig. (two-tailed)	0.001	0.04	0.436	0.39	0.004		0.033	0.171	0	0.722	0.074	0.002	0.777	0.717
Benzene	Pearson Correlation	−0.519	0.115	−0.747**	−0.009	−0.604*	−0.571*	1	0.718**	0.734**	−0.075	0.618*	0.452	−0.515	−0.543*
	Sig. (two-tailed)	0.057	0.695	0.002	0.976	0.022	0.033		0.004	0.003	0.799	0.019	0.105	0.06	0.045
PAH	Pearson correlation	−0.465	−0.106	−0.33	−0.443	−0.222	−0.388	0.718**	1	0.503	−0.237	0.274	0.45	−0.389	−0.314
	Sig. (two-tailed)	0.094	0.719	0.249	0.112	0.446	0.171	0.004		0.066	0.415	0.343	0.106	0.17	0.274
Nicotine	Pearson correlation	−0.855**	−0.216	−0.462	−0.357	−0.775**	−0.835**	0.734**	0.503	1	−0.01	0.747**	0.852**	−0.239	−0.179
	Sig. (two-tailed)	0	0.458	0.096	0.211	0.001	0	0.003	0.066		0.974	0.002	0	0.411	0.54
Amino acid	Pearson correlation	−0.119	−0.032	0.13	0.099	0.267	0.104	−0.075	−0.237	−0.01	1	0.262	−0.118	0.567*	0.242
	Sig. (two-tailed)	0.685	0.914	0.657	0.737	0.356	0.722	0.799	0.415	0.974		0.366	0.689	0.035	0.404
Organic acid	Pearson correlation	−0.655*	0.16	−0.376	−0.206	−0.591*	−0.491	0.618*	0.274	0.747**	0.262	1	0.53	0.097	0.088
	Sig. (two-tailed)	0.011	0.584	0.186	0.479	0.026	0.074	0.019	0.343	0.002	0.366		0.051	0.742	0.764
Sugar	Pearson correlation	−0.855**	−0.356	−0.169	−0.511	−0.532	−0.752**	0.452	0.45	0.852**	−0.118	0.53	1	−0.016	0.09
	Sig. (two-tailed)	0	0.212	0.565	0.062	0.05	0.002	0.105	0.106	0	0.689	0.051		0.956	0.76
NCSM	Pearson correlation	−0.092	−0.309	0.710**	−0.105	0.361	0.083	−0.515	−0.389	−0.239	0.567*	0.097	−0.016	1	0.844**
	Sig. (two-tailed)	0.754	0.283	0.004	0.72	0.205	0.777	0.06	0.17	0.411	0.035	0.742	0.956		0
Polyphenol	Pearson correlation	−0.176	−0.206	0.819**	−0.285	0.255	0.106	−0.543*	−0.314	−0.179	0.242	0.088	0.09	0.844**	1
	Sig. (two-tailed)	0.547	0.48	0	0.324	0.379	0.717	0.045	0.274	0.54	0.404	0.764	0.76	0

Bold numbers mean significant difference. *significant correlation (2-tailed) with P-value less than 0.05, **significant correlation (2-tailed) with P-value less than 0.01, NCSM, nitrogen-containing secondary metabolites.