up to now there is no any proper methodology was given to measure the photosynthetic biomass
http://www.analogforestry.org/what-is-photosynthetic-biomass/
How about the LAI - leave area index? Remotely sensed: http://earthobservatory.nasa.gov/Features/LAI/LAI3.php
Of course it depends at which scale you are wanting to measure and what precision you are willing to accept.
LAI is a good predictor, I believe. What's the purpose? The Relative Growth Analysis give good directions also, in the use of indicators.
The org you meant works on practice impact and restoration mainly by agroforestry. The main variable is integrative gain over monocrops, often measured by land equivalent ratio of crops. the main photosynthetic variable is leaf area duration, the LAD, and much more important erosion and nutrient leakage control. http://library.uniteddiversity.coop/Permaculture/Agroforestry/Agroforestry_in_Sustainable_Agricultural_Systems.pdf#page=15
The main issue is therefore some very long term maesurements of sustainable carbon storage, and this can be approximated by evolutive models but this can be critical for quantitaive results if not only a political issue, https://euraf.isa.utl.pt/sites/default/files/pub/docs/14_20_dupraz.pdf
And if you are interested in measuring carbon assimilation, you may want to look into the issues around estimating net primary production (NPP). See for example our work on NPP for grasses and the related short discussion on page 59-60 that deals with current approaches and associated difficulties(https://www.researchgate.net/publication/261324045_Watching_grass_grow_in_Australia_Is_there_sufficient_production_potential_for_a_biofuel_industry?ev=prf_pub) and for more details check out the reference Roxburgh et al 2004)
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