Heat and drought impact on carbon exchange in an age-sequence of temperate pine forests

Ecological Processes

Table 2 Annual values of gross ecosystem productivity (GEP), ecosystem respiration (RE) and net ecosystem productivity (NEP) in the 80-year-old, 45-year-old, and 17-year-old forest sites from 2003–2019

Year	80-year-old			45-year-old			17-year-old			Ta	PPT
Year	GEP	RE	NEP	GEP	RE	NEP	GEP	RE	NEP	Ta	PPT
2003	1344	1194	155	1340	695	666	494	515	− 17	8.17	913
2004	1244	1129	123	1098	788	318	695	558	145	8.54	955
2005	1239	1163	87	1129	785	346	429	557	− 126	9.11	863
2006	1372	1181	199	1258	750	511	611	569	34	9.82	1478
2007	1298	1180	123	1111	755	366	706	566	160	9.23	712
2008	1545	1342	212	1456	1189	279	976	784	191	8.58	1021
2009	1443	1212	239	1488	1078	418	1137	1034	105	8.39	995
2010	1567	1415	160	1746	1247	509	1412	1241	173	9.54	896
2011	1430	1128	322	1574	1136	452	1462	1252	216	9.56	1293
2012	1452	1385	77	1685	1203	496	1473	1297	183	11.16	1001
2013	1501	1282	228	1691	1091	615	1571	1394	180	9.09	1266
2014	1601	1345	263	1698	939	771	NA	NA	NA	8.08	1188
2015	1701	1328	395	1869	1048	831	1950	1823	128	9.48	811
2016	1617	1491	141	1648	1070	589	1753	1841	− 91	10.03	778
2017	1709	1525	208	1641	1039	620	1805	2014	− 218	9.92	986
2018	1641	1670	− 9	1591	1123	549	1569	1877	− 319	9.42	922
2019	1543	1415	138	1695	916	807	2008	1998	6	8.96	911
Mean	1485	1317	180	1513	979	538	1253	1208	64	9.24	999

NA—Carbon fluxes were not reported at the 17-year-old site in 2014 due to missing data caused by an IRGA malfunction that affected flux data quality
Units for all carbon fluxes are g C m⁻² yr⁻¹. Annual mean air temperature, Ta (°C) and annual total precipitation, PPT (mm yr⁻¹) are also given