政府為合理利用土地、提高土地生產力, 於民國八十年開始推行農地造林
政策, 並期望造林能發揮森林公益性之功能。本研究從農地造林之政策、
私經濟及公經濟三方面評估農地造林成果與效益。於私經濟方面, 參與農
地造林者大多選擇可當景觀用途之樹種為主,本研究選擇栽植戶數較多之
樹種, 配合農地造林政策及市場需求規格, 以淨現值法評估參與農地造林
者之獲利能力, 依評估結果, 栽植景觀樹種較種稻具收益性, 滿足農民對
私經濟之需求, 但景觀樹種常於短期內出栽,且出栽時連土一併掘取, 對
地力破壞嚴重, 未能達當初推行農地造林之森林公益性功能。農民參與農
地造林之動機與農地造林推行目標產生矛盾。在公經濟評估中, 農地造林
對社會之邊際效益為遞增,欲在兼顧私經濟與公經濟上尋求最適之政策措
施, 本研究擬提出「分類補貼」之建議, 期能促使農業政策與環境資源保
育目標同時達成。

The government implemented the policy of afforestation on
agriculture land to improve the production of land and
expect to producethe benefit of forest. The study discusses
the afforestation on agriculture land of implementation
according to the policy、private economics and public
economics. In private economics, particulated farmers mostly
select the trees would be for scenic use. The study adopts the
net present value method and selects some famous species
to coordinate with the policy and marketing for appraisal. To
plant scenic trees has better profits than rice. It would
satisfy the farmers to pursue the profits. To plant scenic
trees will destroy the water-soil conservation, when the
seedings are grown enough to dig and sell. In public economics,
the marginal benefit of afforesta- tion is increacing, but it
is only for really afforestation. To balance the private
economics and public economics , we raise a way ─ “
class subsidy ” to correct the current policy to achieve
the social benefit and farmers profits simultaneously.