9 | | === FUNDAMENTAL ISSUE?: Stoichiometric flexibility === |
10 | | Meyerholdt & Zaehle (2015) showed that model predictions best matched available data when the C:N ratios in all ecosystem pools except the wood pool were treated as flexible. However, there is substantial variation in wood nutrient content found along a gradient of soil fertility (Heineman et al., 2016) and the wood N and P concentration correlates with leaf N and P concentration. |
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12 | | Due to this contrasting findings, I am not sure if we should change the approach of OCN in which cahnges in wood stoichiometry follows leaf stoichiometry. |
13 | | One could argue that changes in stoichiometry due to changing environmental conditions are too fast/strong, but overall the flexibility in stoichiometry is rather narrow. Here more mechanistic based approaches to stoichiometry are needed. This would require a more sensible vegetation/ cost optimization/ etc approaches which are time-consuming to implement/develope. |