環(huán)境風(fēng)險(xiǎn)評(píng)價(jià)與管理課程-文庫吧在線文庫
【正文】 around the central conditioning tank in a wheel and spoke manner. The migration paths from the central conditioning tank to each experimental unit are equal. The CEOMs were developed by Wayne Landis, April Markiewicz, and Robin Matthews. Conditioned Equidistant Outdoor Mesocosm The individual units are covered in plastic to prevent the rains and wind from disturbing the mesocosm units. These coverings were found to be particularly durable throughout the year. Reliably dosing systems of this size was an issue as mixing was often inplete. The concentration in the water column was similar no matter the dose to the surface. Another issue was the small differences in microclimates within the setting resulting in small temperature and illumination differences among the replicates. Mercury Study Report to Congress Volume VI: An Ecological Assessment for Anthropogenic Mercury Emissions in the United States 問題： 1 BCF與 BAF的概念 21 57 2 汞暴露對(duì)生物個(gè)體，種群，生物群落及生態(tài)系統(tǒng)的影響有哪些？ 3 為什么研究酸雨分布區(qū)域 ?怎樣評(píng)價(jià)？ 4 如何選擇評(píng)價(jià)終點(diǎn)？ 23 41 5 針對(duì)汞暴露的風(fēng)險(xiǎn)評(píng)價(jià)，既往研究都作了哪些工作？用了哪些方法？ 6 本報(bào)告書如何評(píng)價(jià)生態(tài)風(fēng)險(xiǎn)？ ７ 選擇甲基汞的原因 ?23 演講完畢，謝謝觀看！ 。 logBCF= 濃縮性的影響因子 ? 暴露濃度 不變，線性增長，曲線增長。 試驗(yàn)時(shí)的水質(zhì)和毒性 根據(jù)化學(xué)物質(zhì)的種類不同，水質(zhì)條件的變化可能會(huì)對(duì)水生生物的毒性產(chǎn)生很大影響。k) Sm 無影響濃度 NOEC的自然對(duì)數(shù)標(biāo)準(zhǔn)偏差； k 毒性數(shù)據(jù)數(shù) m、 p值、 NOEC分布及 HCp置信區(qū)間所確定的常數(shù)。缺點(diǎn)是，同一條件的反復(fù)測(cè)定比較困難，生態(tài)學(xué)影響的檢出靈敏度較低。 一般來講，生態(tài)風(fēng)險(xiǎn)評(píng)價(jià)，多數(shù)場(chǎng)合考慮種群、生物群落、生態(tài)系統(tǒng)層次上的保護(hù)。 生態(tài)風(fēng)險(xiǎn)評(píng)價(jià)的步驟 ? 問題設(shè)定 ? 解析 暴露解析 stressor要素解析 ? 風(fēng)險(xiǎn)推算和說明 生態(tài)學(xué)分級(jí) ? 個(gè)體 individual∶ 單體生物，作為生物可區(qū)分的最小單位 ? 種群 population∶ 占有一定空間的同種個(gè)體的集合 ? 生物群落 m
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