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雷迪美特中国有限公司 雷迪美特中国
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土壤碳中根系分泌物保护作用的机制检测方案(溶解氧测定仪)

主要讨论了根系分泌物对土壤中的碳的保护作用,研究过程中应用unisense氧气微电极对根际周围加入不同的渗入液(草酸、葡萄糖等)后对应的氧浓度剖面分布进行了测试,从而确定了根系分泌物对根际微区微生物呼吸速率的影响。获得的氧浓度剖面表明了草酸的加入显著降低了周围土壤微生物对O2的应用的有效性,其影响的最高深度可达5mm,而葡萄糖和乙酸的添加量则局限在1.5 mm处。草酸处理中的土壤内的微生物呼吸作用超过使用葡萄糖的效果。这也进一步了解根际碳矿化的加速(即启动效应)是否是由渗出物从保护性的矿物-有机结合中释放碳的能力所促进。并发现了一种由根、根相关的真菌和细菌产生的有机酸(草酸),具有较强的金属络合能力,对微生物的生物能利用有限。根际上述的相关实验结构,研究人员发现一种常见的根分泌物草酸会促进使有机化合物从与矿物的保护性联系中释放出来而造成的碳损失。而通过加强微生物与以前的矿物保护化合物,这种间接机制会加速碳损失的过程,该研究结果也为“启动”现象背后的生物-非生物耦合机制提供了一些见解,并挑战了关于矿物质相关的碳是受微生物保护的假设机制
检测样品: 其他
检测项: 植物生理

上海谓载科技有限公司

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棉花栽种粘土中曝气地下灌溉用水的影响检测方案(氧分析仪)

Inadequate oxygen concentration in the root zone is a constraint to plant performance particularly in heavy, compacted and/or saline soils. Sub-surface drip irrigation (SDI) offers a means of increasing oxygen to plant roots in such soils, provided irrigation water can be hyper-aerated or oxygenated. Hydrogen peroxide (HP) at the rate of 5 litre ha-1 at the end of each irrigation cycle was injected through SDI tape to a field-grown zucchini (courgette) crop (Cucurbita pepo) on a saturated heavy clay soil in Queensland, Australia. Fruit yield, number and shoot weight increased by 25%, 29% and 24% respectively due to HP treatment compared to the control. Two pot experiments with vegetable soybean (Glycine max) and cotton (Gossypium hirsutum) compared the effectiveness of HP and air injection using a MazzeiTM air injector (a venturi), throughout the irrigation cycle in raising crop yield in a heavy clay soil kept at saturation or just under field capacity. Fresh pod yield of vegetable soybean increased by 82-96% in aeration treatments compared with the control. The yield increase was associated with more pods per plant and greater mean pod weight. Significantly higher above ground biomass and light interception were evident with aeration, irrespective of soil water treatment. Similarly cotton lint yield increased by 14-28% in aeration treatments compared with the control. The higher lint yield was associated with more squares and bolls per plant which accompanied greater above ground biomass and an increase in root mass, root length and soil respiration. Air injection and HP effected greater water use, but also brought about an enhancement of water use efficiency (WUE) for pod and lint yield, and increased leaf photosynthetic rate in both species but had no effect on transpiration rate and stomatal conductance per unit leaf area.
检测样品: 其他
检测项: 理化分析

科艺仪器有限公司

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菜用大豆栽种粘土中曝气地下灌溉用水的影响检测方案(氧分析仪)

Inadequate oxygen concentration in the root zone is a constraint to plant performance particularly in heavy, compacted and/or saline soils. Sub-surface drip irrigation (SDI) offers a means of increasing oxygen to plant roots in such soils, provided irrigation water can be hyper-aerated or oxygenated. Hydrogen peroxide (HP) at the rate of 5 litre ha-1 at the end of each irrigation cycle was injected through SDI tape to a field-grown zucchini (courgette) crop (Cucurbita pepo) on a saturated heavy clay soil in Queensland, Australia. Fruit yield, number and shoot weight increased by 25%, 29% and 24% respectively due to HP treatment compared to the control. Two pot experiments with vegetable soybean (Glycine max) and cotton (Gossypium hirsutum) compared the effectiveness of HP and air injection using a MazzeiTM air injector (a venturi), throughout the irrigation cycle in raising crop yield in a heavy clay soil kept at saturation or just under field capacity. Fresh pod yield of vegetable soybean increased by 82-96% in aeration treatments compared with the control. The yield increase was associated with more pods per plant and greater mean pod weight. Significantly higher above ground biomass and light interception were evident with aeration, irrespective of soil water treatment. Similarly cotton lint yield increased by 14-28% in aeration treatments compared with the control. The higher lint yield was associated with more squares and bolls per plant which accompanied greater above ground biomass and an increase in root mass, root length and soil respiration. Air injection and HP effected greater water use, but also brought about an enhancement of water use efficiency (WUE) for pod and lint yield, and increased leaf photosynthetic rate in both species but had no effect on transpiration rate and stomatal conductance per unit leaf area.
检测样品: 其他
检测项: 理化分析

科艺仪器有限公司

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西葫芦栽种粘土中曝气地下灌溉用水的影响检测方案(氧分析仪)

Inadequate oxygen concentration in the root zone is a constraint to plant performance particularly in heavy, compacted and/or saline soils. Sub-surface drip irrigation (SDI) offers a means of increasing oxygen to plant roots in such soils, provided irrigation water can be hyper-aerated or oxygenated. Hydrogen peroxide (HP) at the rate of 5 litre ha-1 at the end of each irrigation cycle was injected through SDI tape to a field-grown zucchini (courgette) crop (Cucurbita pepo) on a saturated heavy clay soil in Queensland, Australia. Fruit yield, number and shoot weight increased by 25%, 29% and 24% respectively due to HP treatment compared to the control. Two pot experiments with vegetable soybean (Glycine max) and cotton (Gossypium hirsutum) compared the effectiveness of HP and air injection using a MazzeiTM air injector (a venturi), throughout the irrigation cycle in raising crop yield in a heavy clay soil kept at saturation or just under field capacity. Fresh pod yield of vegetable soybean increased by 82-96% in aeration treatments compared with the control. The yield increase was associated with more pods per plant and greater mean pod weight. Significantly higher above ground biomass and light interception were evident with aeration, irrespective of soil water treatment. Similarly cotton lint yield increased by 14-28% in aeration treatments compared with the control. The higher lint yield was associated with more squares and bolls per plant which accompanied greater above ground biomass and an increase in root mass, root length and soil respiration. Air injection and HP effected greater water use, but also brought about an enhancement of water use efficiency (WUE) for pod and lint yield, and increased leaf photosynthetic rate in both species but had no effect on transpiration rate and stomatal conductance per unit leaf area.
检测样品: 其他
检测项: 理化分析

科艺仪器有限公司

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