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叶绿素中荧光监测中国北方草原生产力对干旱的响应检测方案(叶绿素)

太阳诱导叶绿素荧光 (SIF) 已应用于广泛的生态研究,例如监测和评估干旱、植被生产力和作物产量。 以往研究表明,SIF与总初级生产量(GPP)高度相关,但其与地上生物量(AGB)的相关性仍需进一步探索。在本研究中,我们探讨了 SIF 在监测和评估气候变化和气象干旱对中国北方草原草地 AGB 变化影响方面的潜力。 通过研究轨道碳观测站2 (OCO-2) SIF 与干旱指数之间的关系,我们评估了北部草原生产力对气象干旱条件的响应。结果表明,SIF对气象干旱非常敏感,可以捕捉到干旱事件和不同草地类型的草地生长动态。 SIF、干旱指数和AGB之间的相关性因草地类型而异。梯度提升决策树(GBDT)用于探索草地生态系统中SIF与影响变量之间的关系。 我们发现气候因素(例如,年平均生长季降水量、年平均生长季温度和年平均蒸汽压亏缺)和人类活动(例如,放牧强度)显著影响草地生产力的年际变化。研究结果表明,SIF 变化可以反映中国北方草原植被生长的季节性动态。因此,SIF可以作为评估陆地生态系统模型在模拟该地区生态系统生产力方面表现的基准数据。 SIF 对干旱的高度敏感性表明它是监测和评估干旱事件的有用工具。
检测样品: 其他
检测项: 植物生理

北京澳作生态仪器有限公司

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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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