Google Scholar is a freely available resource, but most publishers do not provide free access to the full text of their journals. The following steps can help you to find the full text articles to which the MSU Libraries subscribe:
Books often provide a more systematic overview of a research topic than is usually found in articles. Theses and dissertations usually have helpful literature reviews that are more detailed than most articles.
e.g. forest* for forest, forests, forestry, forester, etc.