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. 2010 Oct 12;365(1555):3227–3246. doi: 10.1098/rstb.2010.0102

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© 2010 The Royal Society

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Figure 6. — Temporal relationships between spring onset anomalies and early season (January–June) flux anomalies for (a,c) GEP and (b,d) NEP, based on within-site interannual variability (12 ENF sites, 81 site-years of data; 9 DBF sites, 62 site-years of data). Spring onset estimated from (a,b) remote sensing and (c,d) directly from eddy covariance time series of CO₂ exchange. Reported slope coefficients (±1 s.e.) indicate increase in productivity (g C m⁻² d⁻¹) associated with earlier spring. (a) Open circles: ENF (slope = 2.7 ± 1.6); filled circles: DBF (slope = 6.8 ± 1.9); (b) open circles: ENF (slope = 1.5 ± 1.0); filled circles: DBF (slope = 3.9 ± 1.1); (c) open circles: ENF (slope = 6.7 ± 0.6); filled circles: DBF (slope = 10.8 ± 0.8); (d) open circles: ENF (slope = 2.7 ± 0.6); filled circles: DBF (slope = 4.8 ± 0.8).