针对高寒生态区饲草生产需求,本研究系统评估了10个燕麦品种在产量、营养品质及土壤改良方面的综合表现。通过方差分析、结构方程模型和TOPSIS(technique for order preference by similarity to ideal solution)模型综合评价方法揭示...针对高寒生态区饲草生产需求,本研究系统评估了10个燕麦品种在产量、营养品质及土壤改良方面的综合表现。通过方差分析、结构方程模型和TOPSIS(technique for order preference by similarity to ideal solution)模型综合评价方法揭示品种适应性以及与土壤的互作机制,为环青海湖共和盆地草牧业发展提供科学依据。结果表明:美达、福瑞至和黑玫克表现出显著产量优势,鲜草产量50.20~54.78 t·hm^(-2),干草产量18.68~21.48 t·hm^(-2);其中艾斯克鲜干比最低(1.67),而爱沃茎叶比最低(2.19)。营养价值呈现品种特异性,楷模和爱沃粗蛋白含量8.23%~8.45%,美达和艾斯克粗脂肪含量突出(4.94%和4.85%);贝勒2纤维组分表现突出,其粗纤维、中性洗涤纤维和酸性洗涤纤维含量均表现较低,且相对饲喂价值和总可消化养分显著领先,饲用价值较优。贝勒2和福星种植区土壤磷含量表现出较高水平;楷模种植区土壤全氮和全碳含量表现出较高水平。相关性分析提示了高产燕麦品种通常伴随优质营养价值和良好的土壤生态反馈。结构方程模型显示,品种通过直接效应(路径系数0.4088~0.4368)和土壤介导的间接效应(0.0725~0.6885)共同调控产量与营养品质。TOPSIS综合评价表明,楷模综合得分最高(0.580),兼具高产特性、优质营养及良好的土壤反馈能力,可作为环青海湖共和盆地退化草地修复与草牧业发展的优选品种。展开更多
To address the problems with catalytic degradation,such as poisoning and inactivation,a simple and efficient gas purging regeneration technique was developed for iron-based catalyst in-situ regeneration.Specifically,t...To address the problems with catalytic degradation,such as poisoning and inactivation,a simple and efficient gas purging regeneration technique was developed for iron-based catalyst in-situ regeneration.Specifically,the effects of carrier gas types,regeneration temperatures,and granular activated carbon(GAC)addition on iron-based catalyst regeneration were investigated.The Fe_(3)O_(4)/𝛾-Al_(2)O_(3) regenerated at 550°C with additional GAC and 15%water vapor exhibited the optimal degradation efficiency towards polychlorinated biphenyls(PCBs),with an increase from 41.2%to 93.5%,compared with non-regenerated Fe_(3)O_(4)/𝛾-Al_(2)O_(3).In addition,the 60-hour stability test revealed a well-recovered catalytic activity.During the Fe_(3)O_(4)/𝛾-Al_(2)O_(3) regeneration,the coke on the catalyst surface was oxidized and removed in the form of CO_(2),and meanwhile the oxidized Fe(III)was reduced into Fe(II)in the catalyst.This study provides a safe and efficient iron-based catalyst regeneration technology for PCB off-gas degradation and reveals the catalytic activity recovery mechanism during catalyst regeneration.展开更多
文摘针对高寒生态区饲草生产需求,本研究系统评估了10个燕麦品种在产量、营养品质及土壤改良方面的综合表现。通过方差分析、结构方程模型和TOPSIS(technique for order preference by similarity to ideal solution)模型综合评价方法揭示品种适应性以及与土壤的互作机制,为环青海湖共和盆地草牧业发展提供科学依据。结果表明:美达、福瑞至和黑玫克表现出显著产量优势,鲜草产量50.20~54.78 t·hm^(-2),干草产量18.68~21.48 t·hm^(-2);其中艾斯克鲜干比最低(1.67),而爱沃茎叶比最低(2.19)。营养价值呈现品种特异性,楷模和爱沃粗蛋白含量8.23%~8.45%,美达和艾斯克粗脂肪含量突出(4.94%和4.85%);贝勒2纤维组分表现突出,其粗纤维、中性洗涤纤维和酸性洗涤纤维含量均表现较低,且相对饲喂价值和总可消化养分显著领先,饲用价值较优。贝勒2和福星种植区土壤磷含量表现出较高水平;楷模种植区土壤全氮和全碳含量表现出较高水平。相关性分析提示了高产燕麦品种通常伴随优质营养价值和良好的土壤生态反馈。结构方程模型显示,品种通过直接效应(路径系数0.4088~0.4368)和土壤介导的间接效应(0.0725~0.6885)共同调控产量与营养品质。TOPSIS综合评价表明,楷模综合得分最高(0.580),兼具高产特性、优质营养及良好的土壤反馈能力,可作为环青海湖共和盆地退化草地修复与草牧业发展的优选品种。
基金supported by the Fundamental Research Funds for the Central Publicinterest Scientific Institution(No.2024YSKY-44)the National Key R&D Program of China(No.2023YFC3708003).
文摘To address the problems with catalytic degradation,such as poisoning and inactivation,a simple and efficient gas purging regeneration technique was developed for iron-based catalyst in-situ regeneration.Specifically,the effects of carrier gas types,regeneration temperatures,and granular activated carbon(GAC)addition on iron-based catalyst regeneration were investigated.The Fe_(3)O_(4)/𝛾-Al_(2)O_(3) regenerated at 550°C with additional GAC and 15%water vapor exhibited the optimal degradation efficiency towards polychlorinated biphenyls(PCBs),with an increase from 41.2%to 93.5%,compared with non-regenerated Fe_(3)O_(4)/𝛾-Al_(2)O_(3).In addition,the 60-hour stability test revealed a well-recovered catalytic activity.During the Fe_(3)O_(4)/𝛾-Al_(2)O_(3) regeneration,the coke on the catalyst surface was oxidized and removed in the form of CO_(2),and meanwhile the oxidized Fe(III)was reduced into Fe(II)in the catalyst.This study provides a safe and efficient iron-based catalyst regeneration technology for PCB off-gas degradation and reveals the catalytic activity recovery mechanism during catalyst regeneration.
