The ms has undergone a review by two reviewers and one of these has assessed the revised version again. Reviews were generally positive with reviewers suggesting minor/major changes.
Based on the reply to the reviewer comments and the second assessment of reviewer #1 and my own assessment I think that the authors have responded adequately to the reviewer comments and have improved the revised ms by adding further analysis. I thus accept the ms, but ask the authors to include the following technical changes to the ms:

p. 1, l. 21: „... in a subalpine grassland of the Italian Alps.“

Throughout ms – use carbon dioxide or CO2 instead of carbon if you actually mean CO2, as there are many other gaseous forms of carbon that are exchange between ecosystems and the atmosphere (CH4, CO, VOC, ...)

p. 5, l. 1: you mean alpine with regard to the Alps or generally the alpine elevational belt? If the geographic region of the Alps is meant, please use "Alps"

p.7, l. 20: „... the concept of the LUE model, i.e. Eq. 1) ...“

Figure 7 is never cited