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氚水在模拟水稻-水-土壤生态系统中的行为 被引量:4
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作者 史建君 郭江峰 《应用生态学报》 CAS CSCD 2003年第2期269-272,共4页
采用模拟污染物的同位素示踪技术研究HTO(氚水 )在水稻 水 土壤模拟生态系统中的迁移、消长行为 ,并应用三库室开系统模型和非线性回归方法确定了水稻、水和土壤分室的拟合方程 .结果表明 ,田表水中的HTO不仅在系统各分室间转移和分配 ... 采用模拟污染物的同位素示踪技术研究HTO(氚水 )在水稻 水 土壤模拟生态系统中的迁移、消长行为 ,并应用三库室开系统模型和非线性回归方法确定了水稻、水和土壤分室的拟合方程 .结果表明 ,田表水中的HTO不仅在系统各分室间转移和分配 ,而且迅速向系统外散逸 ;HTO中的氚以自由水氚和结合态氚形式存在于水稻中 ,以吸湿性水氚和结晶水氚存在于土壤 ,其中自由水氚 (或吸湿性水氚 )的比活度大于结合态氚 (或结晶水氚 ) ;水稻植株和土壤中HTO比活度随时间增加至最大值后又趋于下降 ,而结合态氚则呈缓慢增加 ;水稻茎秆中的总氚比活度高于其它各部位 ,而后逐渐趋于动态平衡 .对实验数据进行回归分析得 :田表水、土壤和水稻植株中的总氚比活度分别为Cw(t) =3 2 .19e-0 .0 353t+99.94e-0 .330t、Cs(t)=2 0 .42 (e-0 .0 353t-e-0 .330t)和Cr(t) =3 8.49e-0 .0 353t- 10 .13e-0 .330t- 2 8.3 6e-2 .574 4t.方差分析结果表明 ,各回归方程较好地反映了HTO在水稻 水 展开更多
关键词 氚水 模拟水稻-水-土壤生态系统 迁移行为 消长行为 环境行为 放射生态学 核电站放射性排放物
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Comparison of time-restricted and ad libitum self-feeding on the growth,feeding behavior and daily digestive enzyme profiles of Atlantic salmon 被引量:1
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作者 史策 刘鹰 +5 位作者 衣萌萌 郑纪盟 田会芹 杜以帅 李贤 孙国祥 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2017年第4期729-736,共8页
Although it has been hypothesized that a predictable feeding regime in animals allows physiological variables to be adjusted to maximize nutrient utilization and,hence,better growth performance,the assumption has rare... Although it has been hypothesized that a predictable feeding regime in animals allows physiological variables to be adjusted to maximize nutrient utilization and,hence,better growth performance,the assumption has rarely been tested.This study compares the effects of time-restricted versus free access self-feeding on the growth,feeding behavior and daily digestive enzyme rhythms of Atlantic salmon(Salmo salar).In an experiment that lasted 6 weeks,fish(109.9 g) were divided into two groups:group 1 had free access to a self-feeder(FA);group 2 received three meals per day(2 h per meal) at dawn,midday and dusk via a time-restricted self-feeder(TR).At the end of the experiment,the fish were sampled every 3 h over a24-h period.The results showed that the TR fish quickly synchronized their feeding behavior to the feeding window and their blood glucose showed a significant postprandial increase,while FA fish displayed no statistically significant rhythms(P>0.05).Pepsin activity of TR fish also showed a significant daily rhythm(P<0.05) with the acrophase at the second feed and a decrease over the next 12 h.Average daily trypsin,lipase and amylase levels of FA fish were significantly lower than those of TR fish(P<0.01);however,the growth performance of both groups was similar(P>0.05).In conclusion,the study failed to confirm a link between the entrainment of daily digestive enzyme profiles and growth performance,with the TR group showing comparatively poor blood glucose regulation. 展开更多
关键词 Atlantic salmon (Salmo salar) self-feeding regime feeding behavior digestive physiology daily rhythm
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