New Zealand learned a bitter lesson in its efforts to eradicate the American lodgepole pine (Pinus contorta). Lodgepole pines prefer open ground, and forestry workers discovered that the more of the trees they chopped down, the more grew. The reason was that felling the bigger trees allowed more light into the forest, thus giving the Lodgepole pine seedlings the opportunity to spread faster and further.
紐西蘭則在北美扭葉松身上得到慘痛教訓，他們發現喜愛開闊地的扭葉松族群越砍越旺，原來，砍了大樹，森林透光度更好，扭葉松小苗有機可乘，蔓延得也就更快更廣。