碳捕获与封存(carbon capture and storage,CCS)是全球碳减排的重要战略性技术,但封存CO2泄漏对地表生态系统的严重威胁是CCS活动的重要障碍之一。该研究选择受封存CO2泄漏威胁的农田生态系统作为研究对象,通过运用人工控制手段模拟地...碳捕获与封存(carbon capture and storage,CCS)是全球碳减排的重要战略性技术,但封存CO2泄漏对地表生态系统的严重威胁是CCS活动的重要障碍之一。该研究选择受封存CO2泄漏威胁的农田生态系统作为研究对象,通过运用人工控制手段模拟地质封存CO2泄漏到达地表的系列情景,监测农田生态系统主要指标变化,评估和确定封存CO2泄漏对农田生态系统的影响和耐受阈值。研究结果表明,不同泄漏情景下玉米均受到不同程度的不利影响,并且泄漏通量越大,影响程度越深:CO2泄漏情景下的玉米出苗受到严重阻碍,株高和叶片数随泄漏通量增大而呈逐渐减小的趋势,地上部和地下部生物量较对照情景明显减少,光合作用受到干扰,土壤pH值降低。500～2000g/(m2·d)范围内的泄漏情景为玉米对地质封存CO2泄漏的耐受阈值。展开更多
本文主要介绍了有关 p H标度、国家 p H基准和 p H工作标准的建立方法、标准缓冲溶液的配置与保存方法以及 p H的量值传递体系。由于海洋现场 p H观测仪器在测量原理和计量标准等方面与常规实验室 p H计室完全相同 ,因而只要采用国家 p ...本文主要介绍了有关 p H标度、国家 p H基准和 p H工作标准的建立方法、标准缓冲溶液的配置与保存方法以及 p H的量值传递体系。由于海洋现场 p H观测仪器在测量原理和计量标准等方面与常规实验室 p H计室完全相同 ,因而只要采用国家 p H计量标准和合理的计量检定方法对仪器进行校准检定 ,便可以使观测量值溯源到国家基准 ,从而海洋调查资料达到准确一致的目的。另外 ,本文作者还阐述了实验室 p H计的计量检定方法 ,提出了对现场观测仪器在温度补偿和压力校准等方面的一些初步意见 ,供有关技术人员参考。展开更多
The present work aimed to evaluate the behavior of glyphosate herbicide in aquatic environment, considering some water quality parameters, in reservoir conditions without flow and without replacement of evapotranspire...The present work aimed to evaluate the behavior of glyphosate herbicide in aquatic environment, considering some water quality parameters, in reservoir conditions without flow and without replacement of evapotranspired water. Twenty reservoirs (polyethylene water tanks) with a storage capacity of 1000 liters were used. The recommended herbicide dose according to the manufacturer was 7.0 L or 3360 grams of acid equivalent per hectare. For application in the reservoirs, a precision equipment was used to carbon dioxide (CO2), providing a flow of 200 L·ha-1. Freezing macrophyte death was achieved by storing the plants in a freezer at -18°C for a period of 48 hours. The analyses of control efficiency were performed at 7, 14, 21, 28, 35 and 42 days after application (DAA). Water samples for analysis of quality indicators, pH and dissolved oxygen were collected weekly for nine weeks. The obtained result allows concluding that the herbicide glyphosate presented excellent control efficiency of water hyacinth and did not significantly alter the water quality parameters pH and dissolved oxygen, indicating its use in the management of this macrophyte.展开更多
文摘碳捕获与封存(carbon capture and storage,CCS)是全球碳减排的重要战略性技术,但封存CO2泄漏对地表生态系统的严重威胁是CCS活动的重要障碍之一。该研究选择受封存CO2泄漏威胁的农田生态系统作为研究对象,通过运用人工控制手段模拟地质封存CO2泄漏到达地表的系列情景,监测农田生态系统主要指标变化,评估和确定封存CO2泄漏对农田生态系统的影响和耐受阈值。研究结果表明,不同泄漏情景下玉米均受到不同程度的不利影响,并且泄漏通量越大,影响程度越深:CO2泄漏情景下的玉米出苗受到严重阻碍,株高和叶片数随泄漏通量增大而呈逐渐减小的趋势,地上部和地下部生物量较对照情景明显减少,光合作用受到干扰,土壤pH值降低。500～2000g/(m2·d)范围内的泄漏情景为玉米对地质封存CO2泄漏的耐受阈值。
文摘本文主要介绍了有关 p H标度、国家 p H基准和 p H工作标准的建立方法、标准缓冲溶液的配置与保存方法以及 p H的量值传递体系。由于海洋现场 p H观测仪器在测量原理和计量标准等方面与常规实验室 p H计室完全相同 ,因而只要采用国家 p H计量标准和合理的计量检定方法对仪器进行校准检定 ,便可以使观测量值溯源到国家基准 ,从而海洋调查资料达到准确一致的目的。另外 ,本文作者还阐述了实验室 p H计的计量检定方法 ,提出了对现场观测仪器在温度补偿和压力校准等方面的一些初步意见 ,供有关技术人员参考。
文摘The present work aimed to evaluate the behavior of glyphosate herbicide in aquatic environment, considering some water quality parameters, in reservoir conditions without flow and without replacement of evapotranspired water. Twenty reservoirs (polyethylene water tanks) with a storage capacity of 1000 liters were used. The recommended herbicide dose according to the manufacturer was 7.0 L or 3360 grams of acid equivalent per hectare. For application in the reservoirs, a precision equipment was used to carbon dioxide (CO2), providing a flow of 200 L·ha-1. Freezing macrophyte death was achieved by storing the plants in a freezer at -18°C for a period of 48 hours. The analyses of control efficiency were performed at 7, 14, 21, 28, 35 and 42 days after application (DAA). Water samples for analysis of quality indicators, pH and dissolved oxygen were collected weekly for nine weeks. The obtained result allows concluding that the herbicide glyphosate presented excellent control efficiency of water hyacinth and did not significantly alter the water quality parameters pH and dissolved oxygen, indicating its use in the management of this macrophyte.
