Relevant papers that Ben has run across

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Correlation-based flux partitioning of water vapor and carbon dioxide fluxes: Method simplification and estimation of canopy water use efficiency
10.1016/j.agrformet.2019.107732

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Do increasing respiratory costs explain the decline with age of forest growth rate?https://link.springer.com/article/10.1007/s11676-019-01020-w

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The fate of carbon in a mature forest under carbon dioxide enrichment
https://www.nature.com/articles/s41586-020-2128-9
"In contrast, our results suggest a direct connection between plant photosynthesis and belowground activity (Extended Data Fig. 7), in which increased belowground carbon allocation increased soil respiration at a rate that accounted for half of the extra carbon fixed under eCO2 (Fig. 2)."

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Gomez-Casanovas, N., Matamala, R., Cook, D.R., Gonzalez-Meler, M.A., 2012. Net ecosystem exchange modifies the relationship between the autotrophic and heterotrophic components of soil respiration with abiotic factors in prairie grasslands. Glob. Chang. Biol. 18, 2532-2545.

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Peishi Jiang's manuscript has a good description of calculating the hysteresis between Rsoil and ...