@Please clarify your question little more.

We are studying the sustainability of the bread chain basing on a list of 24 attributes. Biodiversity is among the attributes. We are settin ug up a questionnaire for bread producers.

http://glamur.eu/

thank you M. C. Sidhu 

You are talking about biodiversity, which is related to all the living things in a particular area. So biodiversity conservation means you want to conserve biodiversity of some area. But you are concerned with wheat and bread chain, traditional versus industrial food.

I do not understand, what is your question??

First you would have to define traditional versus industrial food chain. Concerning biodiversity on the farm level is relatively easy. You definy comparable field areas of traditional and "industrial" farmers and then you monitor biodiversity. (indicator species, rare species and so on).  But how you measure the influence of processing and trading companies (transport distance) on biodiversity seems to be very difficult to answer. FIBL Austria has made a study on Biodiversity of organic versus conventional milk products for Hofer/Aldi (the retail chain).

Thank you Reiner. I'll check the study.

and thank you M C. For example, advances in breeding technologhy have lowered the genetic diversity of wheat seeds. So, the "age" of a CV can be an indicator for assessing biodiversity. It is my supposition. Does it make sense for you?

Yes the advancement in breeding technology may affect the genetic diversity of wheat. But large number of wheat varieties are grown in different parts of the world. This is helpful in the conservation of the genetic diversity of wheat. But if we talk about any particular area or region where only selected wheat genotypes are grown to meet the requirements. The diversity may get affected.

thanks