"My family has been cutting wood here and looking after the forest for almost 900 years, and I think it is in a good condition," the prince told The Daily Telegraph. "The environment is good and the forest is famed for its beech trees. If it became a park, then we won't be allowed to cut wood.
I see no advantage in the land becoming part of the park." The prince argues centuries of careful management have developed a sustainable environment, rich in flora and fauna, and one that is open to the public.
A national park, he explained, would stop foresting, bringing an end to centuries of tradition and damage his family's business.
This has made him rebuff all attempts by state government to convince him to accept the national park.
But the aristocrat's opposition has riled the North-Rhine Westphalia government. Controlled by a coalition of the left-wing Social Democrats and the Green Party, it has set its heart on creating a national park. The park, the government claims, will turn the woods into a unique primeval beech forest, free of man's interference.
"He may own the land but he also has a responsibility to the environment," said Norwich Russe, state conservation spokesman for the Greens. "The Prince of Lippe can say that he looks after the forest but he has to do more.
"The park will help preserve nature," he continued. "When you think of climate change you have to do all you can to protect the environment. Also a park will bring in tourists and that would be good for the local economy." Mr Russe added the prince would benefit financially from increased tourism.
But as an indication of the passions involved, the battle over the Teutonic Forest has also become laced with class politics.
"We no longer live in a monarchy ... the Teutoburg Forest National Park can manage without a prince," wrote Sigrid Beer, a member of the state parliament and chairwoman of the parliamentary Green Party, on her website.
"The Prince of Lippe is trying to impose his opinion on public committees.
But a democracy is about decision-making and majority votes of the democratically elected committees." Other supporters of the park have, apparently, expressed their anger over the opposition stemming from "dieser Blaubutige" this blue blood.
The prince views talk of his royal background as a ploy used by his opponents to turn up the pressure on him in the hope that he will eventually allow his land to become part of the park.
"I think this talk of my background is ridiculous," he said. "It is polemic but we are unfortunately in a position that we are often confronted by it.
"They try to pressure me or convince me to sell the land," he continued.
"Basically they are saying 'You have a choice. Either you can get a lot of money or you get a lot of anger.' I chose the anger."