臺灣的林業政策隨著社會及文化的演進而有許多改變。然因政策之轉型及林木之價格低落，部份林農捨棄造林或竹木，相繼改種高價值經濟作物，造成林農混雑的情形。然而在混農林狀況下農藥及肥料的施用可能對森林之生態造成的衝擊仍然未知，因此本研究針對混農林範圍分別採集農業施作地點之樣品及周圍非農業耕作地點之樣品分析農藥之殘留情形以比較並評估農藥在混農林環境中流布情況及對環境之衝擊。期能提供混農林業時選擇種植物種、施藥或耕作方式上之參考，並訂定合理之混農林業規範。由研究結果顯示，分別偵測茶園中茶葉、雑草及茶園外林地中雑草之農藥殘留情形發現，農藥有向茶園外擴張的現象。農藥可能藉由漂散或隨著灌溉水、降雨或隨地勢走向而向週圍擴散。在偵測到的農藥種類中，以合成除蟲菊精和三唑系的農藥居多。合成除蟲菊精類農藥對多數水生無脊椎動物和魚類具有高毒性，因此，對於施用合成除蟲菊精類農藥之地區，需長期監控其周遭水生生態系。而具1,2,4-triazole結構之農藥，具雌激素活性，是一種内分泌干擾物質，因此應對施用三唑系農藥之地區之生態系進行評估。

The changes of Forestry policy were accompanying the evolution of society and culture in Taiwan. Owing to timber price were cutting, some foresters are giving up the afforestation and switching to cultivate the high value crops. So mixed farming and forestry is becoming increasingly prevalent. But the impact of conventional agriculture on the forest ecology is unknown. In this study, we were trying to understand the drift of pesticides in tea garden surround by forest. We detected the pesticide residues in plants which were sampled from the tea garden and its surrounds. From the result, most pesticides resides are synthetized pyrethrin insecticides and conazole type fungicides. Pyrethrin is a type of high fish toxicity insecticides. The effect of these pesticides on the aquarium ecosystem in forest should be paid more concern if it were spread from tea garden to the forest. Some conazole type fungicides were suspected to be environment hormone because it 1,2,4-triazole chemical structure. It has estrogen activity could disrupt animal endocrine system. A long term monitoring the impact of pesticide on the ecosystem is necessary if the mixed farming and forestry could be avoided.