Fifty samples from the source rocks in Member 3 and Member 4 of the Paleogene Shahejie Formation in the Bohai Bay Basin, East China, were analyzed to investigate the distribution, evolution of the molecular maturity r...Fifty samples from the source rocks in Member 3 and Member 4 of the Paleogene Shahejie Formation in the Bohai Bay Basin, East China, were analyzed to investigate the distribution, evolution of the molecular maturity ratios C29ββ/（ββ＋αα） and C2920S/（20S＋20R） and their control factors in the natural geological profile and sequence. The results showed that progressive changes in molecular maturity parameters are associated with major changes in thermal evolution of related biomarkers. Increases in the C29ββ/（ββ＋αα） and C2920S/（20S＋20R） ratios result from the difference in the relative rate between generation and thermal degradation of isomers involved. The samples from a hyper-saline environment below 3.5 km in which evaporitic rocks deposited shows high response of Sr/Ba, Sr/Ca, Fe/ Mn, Pr/n-C17, Ph/n-C18 and gammacerane and low response of Pr/Ph. There presents negative reversal of biomarker maturity C29ββ/（ββ＋αα, C29ββ/（ββ＋αα） and Ts/（Ts＋Ym） in the samples from hypersaline environment, reflecting that the gypsum- halite have negative effect on the isomerization of biomarker and thermal evolution of organic matter. The minerals in evaporites also retard the conventional thermal indicators including vitrinite reflectance （Ro） and pyrolysis peak temperature Tmax at the depth below 3.4 km （i.e. 〉3.4 km）, and these parameters also show the inhibition from overpressure in the range of 2.4-3.4 kin. This result will be helpful in the interpretation and application of molecular maturity parameters for similar saline lacustrine basins.展开更多
为明确24%五氟磺草胺·吡嘧磺隆·氰氟草酯油悬浮剂对直播稻田杂草的防治效果,2015~2016年在大田条件下研究了其对水稻直播田杂草的防治效果及对水稻产量的影响。试验结果表明:该药剂对稻田禾本科杂草稗草和千金子、阔叶杂草鸭...为明确24%五氟磺草胺·吡嘧磺隆·氰氟草酯油悬浮剂对直播稻田杂草的防治效果,2015~2016年在大田条件下研究了其对水稻直播田杂草的防治效果及对水稻产量的影响。试验结果表明:该药剂对稻田禾本科杂草稗草和千金子、阔叶杂草鸭舌草和节节菜以及莎草科杂草异型莎草均具有良好的防效,且对水稻安全。其适宜的施用剂量为144.0~180.0 g a.i./hm2,施药适期为水稻3~5叶,稗草3~4叶期或千金子2~3叶期。水稻增产幅度在148.1%~207.9%之间,与对照相比增产明显。展开更多
基金supported by the National Natural Science Foundation of China(40802026)"the Fundamental Research Funds for the Central Universities"
文摘Fifty samples from the source rocks in Member 3 and Member 4 of the Paleogene Shahejie Formation in the Bohai Bay Basin, East China, were analyzed to investigate the distribution, evolution of the molecular maturity ratios C29ββ/（ββ＋αα） and C2920S/（20S＋20R） and their control factors in the natural geological profile and sequence. The results showed that progressive changes in molecular maturity parameters are associated with major changes in thermal evolution of related biomarkers. Increases in the C29ββ/（ββ＋αα） and C2920S/（20S＋20R） ratios result from the difference in the relative rate between generation and thermal degradation of isomers involved. The samples from a hyper-saline environment below 3.5 km in which evaporitic rocks deposited shows high response of Sr/Ba, Sr/Ca, Fe/ Mn, Pr/n-C17, Ph/n-C18 and gammacerane and low response of Pr/Ph. There presents negative reversal of biomarker maturity C29ββ/（ββ＋αα, C29ββ/（ββ＋αα） and Ts/（Ts＋Ym） in the samples from hypersaline environment, reflecting that the gypsum- halite have negative effect on the isomerization of biomarker and thermal evolution of organic matter. The minerals in evaporites also retard the conventional thermal indicators including vitrinite reflectance （Ro） and pyrolysis peak temperature Tmax at the depth below 3.4 km （i.e. 〉3.4 km）, and these parameters also show the inhibition from overpressure in the range of 2.4-3.4 kin. This result will be helpful in the interpretation and application of molecular maturity parameters for similar saline lacustrine basins.
文摘为明确24%五氟磺草胺·吡嘧磺隆·氰氟草酯油悬浮剂对直播稻田杂草的防治效果,2015~2016年在大田条件下研究了其对水稻直播田杂草的防治效果及对水稻产量的影响。试验结果表明:该药剂对稻田禾本科杂草稗草和千金子、阔叶杂草鸭舌草和节节菜以及莎草科杂草异型莎草均具有良好的防效,且对水稻安全。其适宜的施用剂量为144.0~180.0 g a.i./hm2,施药适期为水稻3~5叶,稗草3~4叶期或千金子2~3叶期。水稻增产幅度在148.1%~207.9%之间,与对照相比增产明显。
