Things can be intrinsically valuable to humans i.e. the enjoyment of a sunset, the taste of an apple, etc.etc. Things that are good for some end or purpose. Anyway there surely can be use values or instrumental values that have no relationship to what humans value. Food and drink are instrumentally valuable for dogs, cats, etc. Veterinary treatment for a dog's broken leg is instrumentally valuable even though it would give great joy to the owner that the dog suffer and die.
Nature is instrumentally valuable in serving the needs of other organisms as well as our own.
I do not comprehend deep ecology. Deep ecologists seem to give a value to nature that is not just instrumental to human and other species needs nor even to the intrinsic value felt by humans in contemplating nature or biosystems. For deep ecologists nature has some value wholly independent of any consciousness. The notion that the greater the biodiversity in a system the more valuable it is in some intrinsic sense makes no sense to me. I can see that it may be important from the point of view of instrumental value that there be greater biodiversity but not in terms of intrinsic value.