From Odum (Father of modern ecology) Ecosystem follows the laws of termodynamics 1st law 2nd law The way the laws have been put it looks alright but they are valid for closed systems only which ecosystems are not. However according to wikipedia apart from having a closed system there are several other factors to consider: 1. 1st law 2. 2nd law Note: I have fundamental idea about thermodynamics having read physics upto class XII level. My understanding about the validity of these laws in ecosystems isn't getting any better.