Study highlights the dominant role of light competition in grassland plant diversity nature
. Each year, we added light during the active growing season: the lamps were switched on early in the spring , when temperatures were clearly above zero, and switched off and removed when temperatures dropped close to zero in November–December and aboveground plant parts had died and formed litter. Each day, the lamps were set to switch on two hours after sunrise, and to switch off two hours before sunset, and when the temperature exceeded 28 °C to prevent overheating.
At the end of August 2017, after running the fertilization–light-addition experiment for one growing season, we expanded the experiment by implementing the herbivore exclusion treatment in a full-factorial combination with the other treatments. Two of the previously established 1.4 m × 1.4-m plots, one with and one without the fertilization treatment, were randomly allotted to the herbivore exclusion treatment and fenced with rectangular metal fences of 1.8 m × 1.
In May–June 2020, we measured plant height , SLA , foliar C:N and LWC , expressed as milligrams per gram
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