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[目的]研究太原盆地玉米和大豆的光合日变化以及光合光响应变化.[方法]采用Licor-6400型便携式光合测定仪进行测定,各参数使用非直角双曲线和二项式曲线拟合.[结果]玉米日变化曲线呈双峰型,pn峰值分别出现在10:00和15:00,有明显的光合午休现象.大豆日变化曲线由于天气状况的影响呈3峰型,Pn峰值分别出现在10:00、12:00和16:00,不考虑下午天气状况影响的条件下,也存在明显的光合午休现象.随着光合有效辐射强度PAR的增加,玉米和大豆的净光合速率Pn增大.当PAR达到1 900 μmol/(m2·s)时,大豆出现光抑制现象,玉米在PAR达到1 700 μmol/(m2·s)时出现光抑制现象.[结论]玉米和大豆均表现为典型的阳性植物特点,R2分别为0.958和0.932,拟合效果良好. 相似文献
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中高渗透油藏分析方法是否仍适合低渗透油藏尚需验证。针对此问题,在低速非达西渗流理论的基础上,研究低渗透油藏的产量规律,并给出相应的油田产量递减率与产量、生产时间的算式,以及低渗透油田产量递减率通式。 相似文献
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Inclusion behavior of oxybutynin (OBN) with hydroxypropyl-β-cyclodextrin (HP-β-CD) was investigated by ultraviolet absorption spectrum and fluorescence spectrum. A reliable determination of the complex
stoichiometry was provided by the continuous variation technique. Alcohol was added to further investigate the mechanism of
the inclusion behavior. Thermodynamic constants ΔG, ΔH and ΔS for inclusion interaction of OBN and HP-β-CD were determined. The results show that host-guest complex with molar ratio of 1:1 is formed, and inclusion stability constant
between OBN and HP-β-CD is 54.9 L/mol determined by ultraviolet spectrum and 11.1 L/mol determined by fluorescence spectrum. OBN has weak binding
ability with HP-β-CD in aqueous solution (stability constant <102 L/mol) and addition of alcohol leads to a decrease of stability constant, which indicates that the hydrophobic force contributes
to the inclusion process. ΔG, ΔH and ΔS are all less than zero, which indicates that the inclusion process is a spontaneous and exothermic process. 相似文献
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定性分析有机同相沉积对储层的影响,定量研究有机固相沉积后储层的损伤情况.利用岩石-毛细管模型描述地层孔隙空间,并用孔隙度、渗透率与比面等的相互关系推导出有机同相沉积量与储地层参数的变化关系式. 相似文献
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结合浑源县自然地理环境概况,分析该县水土流失现状,指出水土流失治理中存在的问题,提出针对当前水土流失现状的治理对策,对改善生态环境和促进经济社会发展具有重大意义。 相似文献
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选取苏里格气田的2块岩心,借助扫描电镜分析、X-射线能谱分析和全岩X-衍射分析手段,开展了饱和地层水条件下液态CO_2对岩心渗透率影响的研究。研究结果表明,引起岩心渗透率损害的原因有:岩心中微粒及黏土矿物发生运移导致孔喉堵塞;孔隙空间被岩石吸附的CO_2占据;CO_2与地层水中的Ca~(2+)发生化学反应,生成了难溶的CaCO_3垢。 相似文献
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