Figure 6

Relationship between net ecosystem CO2 exchange (NEE) and light intensity at the fenced and grazed meadows during DOY 180–250, 2012–2013.
The curves are fitted results using Eq. (1) based on the observed data (nFenced = 902, nGrazed = 1565). The observed NEE were separated into two sections with a threshold of 1500 μmol m−2 s−1.