When trees are cut amount of oxygen?

This is more of a statement then a question but in essence the answer is no. Oxygen is the byproduct of a process called photosynthesis where the suns energy is converted into fuel that the tree can use to grow. This energy forms in the cells of the flora and are readily observed as glucose (glucose is basically sugar). Photosythesis also occurs in plants where the suns rays are captured by Chlorophyll. Chlorophyll is a chemical found in chloroplasts (chloroplasts are a specific subunit within the cell designed to execute one and only job). Oxygen is just a waste product of this awfully fascinating cycle of life on planet Earth Further research can be instigated and a raft of other sources can be used such as Wikipedia (search for PHOTOSYNTHESIS)