What is the meaning of 立体 in 立体还原一个地区地生态多样性？
'In a multifaceted manner' seems like a good choice. In '立体还原', '还原' is a verb 'restore'  ; that makes '立体' an adverb 

'立体还原'  can be translated as:  'restore in a multidimensional manner' or
'restore in a multifaceted manner' (having many aspects or phases)