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Bog biomes are very different from one environment to the next. Bogs come in many forms, some with very large trees, some with small, and some not at all. I must also make the observation that this seems to have always been a bog, not one that was made per se. They can leave these types of scars, which are unsightly, but often turn to a form of vernal pool in the wetter landscapes. The trenches read like they have been made by a "skidder" which is a heavy logging machine. I can only go by your description, and with out seeing it or photo, it is really hard to make an definitive determination of what you really have. If I haven't provided enough information, or some photos would help of these things please let me know Would it be wise to gather up some of these old dead trees and start filling the trenches accumulating water? Do a bit of a mini forest hügulkulturs so to speak, giving a chance for the manmade holes to once again become the water absorbing soil they used to be? Or is the way to let nature now run its self correcting course? Or were the past owners wiser than I and should we be clearing / improving the trenches to help the water get out of the forest and into our big pond? I guess the soil is too wet and soft to hold them up anymore. In these parts of the forming bog, there are many branches, and small trees simply toppling over. I'm guessing what happened was when they felled the forest, there started to be flooding so they thought they would put trenches around the place to help things along.

The water mostly accumulates and stagnates in these trenches, and only runs into the big pond when there is massive rainfall.

There are also man made trenches, which run through parts of the forest, directing water into a pond (20m x 50m x 3m). For example, there is an area of a few acres that once pines thrived is turning into a bog, where only birches do well.

Parts of the forest however now seem less then healthy. The old folk in the area tell us the previous owners felled a lot of the old growth and left the young trees, which are what we have today. We have a property of 30 acres (12.5 hectares) which until about 20 years ago was relatively untouched forest, which had a mixture of oaks, birches, spruces, pines etc.