wood chip from north MN swamps
I am buying a small lowland lot. My plan is converting some of it into sustainable wetland and some tillable garden. I find it useful to chip the dead and logged trees to make new compost and new soil. What are common hazards associated in this that is often neglects? For example, are some trees found in North MN containing chemicals that slows composting, or harms the soil? are some trees
To my knowledge, there are really no "hazards" per se about recycling and using wood chips from downed trees with the exception of black walnut. Black walnut nuts, roots, leaves and branches release a compound called juglone that deters many other plants from growing near / under it. Here is a list of plants sensitive to juglone: http://www.extension.umn.edu/garden/yard-garden/trees-shrubs/toxicity-of-black-walnuts-towards-other...
Here is a list of plants that are not sensitive to juglone:
The only other piece of advice I can give you is to amend planting soil - especially in the garden area - with a slow release nitrogen fertilizer. Wood will use up nitrogen in soil as it decomposes making it not available to your garden plants.
Feel free to reply with additional questions.