Jim Webster > writes
>
>"Buxqi" > wrote in message
...
> >
>> How is "marginal" land less valuable to wild species
>> than is cultivable land?
>
>Well, which is more fertile on average?
>>
>
>marginal land does tend to be marginal because of low fertility, and also
>because it has been farmed less, as farming can increase the fertility over
>time if you are doing it right

Its also worth remembering that, like humans, wildlife crops biomass.
Fertile soils produce more biomass than infertile ones and thus ought to
have more wildlife.

Of course this isn't true where plants have gained the upper hand, pine
forest for example, where biodiversity is low and non-plants relatively
scarce compared to non-forest.

--
Oz
This post is worth absolutely nothing and is probably fallacious.