Writing my discussion part

I am currently writing a discussion part of a paper about carbon stock in riparian system. My results clearly shows that there are simply lacking of information on things supposedly to be important to conclude that riparian system simply is a better carbon stock compare to upland system. The information on belowground variables, especially when it comes to the biology, is really lacking. I'm not even talking about lack of assessment of soil biota, but lacking something as simple as root architecture through depth is really really... shocking and making me sad.