For instance, tea bushes have to be planted on terraces for continuous irrigation, and they require a lot of attention, so they are usually planted on gentler slopes. Fruit orchards need rather less care and so are planted on rather steeper slopes. This is why soil erosion is less severe upstream of the Feitsui Reservoir, where there are many tea gardens, than above the Shihmen Reservoir.
例如需要設置平台與山邊溝保持水流暢通的茶園，所花費的人工多，因此通常種在較緩坡；至於果園所需的照顧次一等，坡度也因此較陡，這也是上游多茶園的翡翠水庫，土壤流失不如石門水庫嚴重的原因。