從環(huán)境生態(tài)的面向,(編輯修改稿)
2025-11-17 12:15 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 15 Creating new weeds ?基改植物可能與野生植物雜交，而讓野生植物含有基改的基因 (抗蟲 )。 ?抗蟲和有蟲的植物，花果實(shí)的產(chǎn)量相差，可高達(dá) 25倍。 ?抗蟲的植物，可能會(huì)有較強(qiáng)的擴(kuò)散能力，如同雜草 (weeds)，造成對(duì)環(huán)境和經(jīng)濟(jì)的傷害。類似強(qiáng)勢(shì)的外來(lái)種。 新雜草 16 Troubles for nontargets 案例： ?a plant that is toxic to Colorado potato beetles could conceivably also be toxic to nonpest beetles or to beetles that actually benefit farmers, including ladybird beetles (瓢蟲 ). ?Losey and his colleagues studied the effects of pollen produced by transgenic corn that resists lepodopteran pests. 非目標(biāo)物種 17 Fig. 5. This corn releases an insecticidal pound (red) through its roots into the soil. That pound can remain insecticidal for 230 days or more and could impact populations of soil anisms. In addition, pollen from Bt corn (blue) can travel as far as 60 meters, where it coats the surface of noncrop plants. Nontarget insects, including monarch butterfly larvae, consume some of the windblown corn pollen. 18 Dealing with uncertainty ?Risk analysis should reveal how the public good might suffer if new technologies backfire. ?We could assume that a transgenic product is unsafe until the manufacturer demonstrates its safety. (禁漏原則 ： precautionary principle) 不確定性 19 ? 問(wèn)題與討論！ Ayo 臺(tái)南 20 有機(jī)農(nóng)業(yè) vs. 現(xiàn)代農(nóng)業(yè) ?作者： Pimentel, D. P. Hepperly, J. Hanson, D. Douds and R. Seidel (2020) ?主題： Environmental, energetic, and economic parisons of anic and conventional farming systems (有機(jī)農(nóng)業(yè) 與 現(xiàn)代農(nóng)業(yè) 的 環(huán)境 ， 能量 與經(jīng)濟(jì) 的比較 ). ?出處： BioScience 55(7):573582. 3 21 FST， 22年的 田野實(shí)驗(yàn) ?From 1981 through 2020, field investigations ?Rodale Institute FST (Farming Systems
教學(xué)課件相關(guān)推薦
鄂ICP備17016276號(hào)-1