【目的】旨在寻找最适合铁心杉幼苗生长的肥料配比。【方法】采用“3414”试验设计方案,设置14组肥料配比,以每组50盆的1年生铁心杉实生苗为材料,探究不同肥料配比对幼苗生长和生理生化指标的影响。【结果】与不施肥相比,合理施肥的铁...【目的】旨在寻找最适合铁心杉幼苗生长的肥料配比。【方法】采用“3414”试验设计方案,设置14组肥料配比,以每组50盆的1年生铁心杉实生苗为材料,探究不同肥料配比对幼苗生长和生理生化指标的影响。【结果】与不施肥相比,合理施肥的铁心杉幼苗叶片的叶绿素含量最高提高了42.01%,可溶性糖含量最高提高了11.64%,可溶性蛋白含量最高提高了13.81%,游离脯氨酸含量最高提高了211.25%;在N_(2)P_(2)K_(1)的肥料配方下,铁心杉幼苗的苗高、根直径、地上生物量、地下生物量、总生物量及苗木质量指数达到最大值,地径、根表面积和总根长也处于中上水平。【结论】N_(2)P_(2)K_(1)(每盆施1.0 g N、1.0 g P、0.5 g K)是铁心杉幼苗最佳的施肥配方。展开更多
【目的】组建铁心杉优良杂交组合,为铁心杉种质资源圃构建及种子园配置提供数据支撑和科学依据。【方法】选取铁心杉优良母树3576个半同胞子代中表现优良的幼苗优株以及403个候选父本、10个母本作为研究对象,筛选15个EST-SSR标记,采用AB...【目的】组建铁心杉优良杂交组合,为铁心杉种质资源圃构建及种子园配置提供数据支撑和科学依据。【方法】选取铁心杉优良母树3576个半同胞子代中表现优良的幼苗优株以及403个候选父本、10个母本作为研究对象,筛选15个EST-SSR标记,采用ABI 370XL毛细管电泳检测PCR扩增产物,利用软件GeneMarker 2.20进行基因分型、软件PIC_CALC Version 0.6计算多态信息含量(PIC),GenALex6.5估算各个SSR位点的等位基因数目(NA)、期望杂合度(HE)、观测杂合度(HO);以等位基因分布频率为基础,CERVUS3.0.7软件和最大似然值法计算LOD值进行父本鉴定,计算NE-1P、NE-2P和NE-PP。【结果】共计选出50株铁心杉半同胞优株;15个SSR位点在所有样本中的平均等位基因数、平均观测杂合度和平均期望杂合度分别为9.867、0.475和0.679;15个SSR位点的多态信息含量PIC值在0.356~0.876,平均为0.634;平均NE-1P、NE-2P和NE-PP为0.872、0.802、0.702;50个半同胞子代在403个疑似父本中检测出的最似父本LOD值均大于0,其中TXS-14的繁殖贡献率最高为6%,TXS-20、TXS-201、TXS-204、TXS-399、TXS-5的繁殖贡献率次之,为4%,其余均为2%,共鉴定出42个真实父本,选出高配合力亲本杂交组合50对。【结论】已发表的SSR标记能够用来对铁心杉半同胞子代优株进行父本鉴定,研究结果将为铁心杉种质资源圃的构建提供理论依据和进一步开展铁心杉分子辅助杂交育种奠定基础。展开更多
We summarized the design, fabrication challenges and important technologies for multi-wavelength laser transmitting photonic integration. Technologies discussed include multi-wavelength laser arrays, monolithic integr...We summarized the design, fabrication challenges and important technologies for multi-wavelength laser transmitting photonic integration. Technologies discussed include multi-wavelength laser arrays, monolithic integration and modularizing coupling and packaging. Fabrication technique requirements have significantly declined with the rise of reconstruction-equivalent-chirp and second nanoimprint mask technologies. The monolithic integration problem between active and passive waveguides can be overcome with Butt-joint and InP array waveguide grating technologies. The dynamic characteristics of multi-factors will be simultaneously measured with multi-port analyzing modules. The performance of photonic integration chips is significantly improved with the autoecious factors compensation packaging technique.展开更多
The experimental optimization of a 10 GHz optoelectronic oscillator (OEO) based on a 1.55 μm directly modulated distributed feedback (DFB) laser is demonstrated in this paper. The phase noise of the directly modulate...The experimental optimization of a 10 GHz optoelectronic oscillator (OEO) based on a 1.55 μm directly modulated distributed feedback (DFB) laser is demonstrated in this paper. The phase noise of the directly modulated laser (DML) based OEO is significantly reduced by proper selection of the laser's bias current and by using a dispersion shifted fiber as a delay line. The phase noise performance of the DML OEO achieved after optimization is close to that of a conventional OEO constructed using a commercial DFB laser and a LiNbO 3 Mach-Zehnder modulator. The DML based OEO is most promising for future realization of a miniature OEO architecture with the components integrated on a semiconductor substrate.展开更多
文摘【目的】旨在寻找最适合铁心杉幼苗生长的肥料配比。【方法】采用“3414”试验设计方案,设置14组肥料配比,以每组50盆的1年生铁心杉实生苗为材料,探究不同肥料配比对幼苗生长和生理生化指标的影响。【结果】与不施肥相比,合理施肥的铁心杉幼苗叶片的叶绿素含量最高提高了42.01%,可溶性糖含量最高提高了11.64%,可溶性蛋白含量最高提高了13.81%,游离脯氨酸含量最高提高了211.25%;在N_(2)P_(2)K_(1)的肥料配方下,铁心杉幼苗的苗高、根直径、地上生物量、地下生物量、总生物量及苗木质量指数达到最大值,地径、根表面积和总根长也处于中上水平。【结论】N_(2)P_(2)K_(1)(每盆施1.0 g N、1.0 g P、0.5 g K)是铁心杉幼苗最佳的施肥配方。
文摘【目的】组建铁心杉优良杂交组合,为铁心杉种质资源圃构建及种子园配置提供数据支撑和科学依据。【方法】选取铁心杉优良母树3576个半同胞子代中表现优良的幼苗优株以及403个候选父本、10个母本作为研究对象,筛选15个EST-SSR标记,采用ABI 370XL毛细管电泳检测PCR扩增产物,利用软件GeneMarker 2.20进行基因分型、软件PIC_CALC Version 0.6计算多态信息含量(PIC),GenALex6.5估算各个SSR位点的等位基因数目(NA)、期望杂合度(HE)、观测杂合度(HO);以等位基因分布频率为基础,CERVUS3.0.7软件和最大似然值法计算LOD值进行父本鉴定,计算NE-1P、NE-2P和NE-PP。【结果】共计选出50株铁心杉半同胞优株;15个SSR位点在所有样本中的平均等位基因数、平均观测杂合度和平均期望杂合度分别为9.867、0.475和0.679;15个SSR位点的多态信息含量PIC值在0.356~0.876,平均为0.634;平均NE-1P、NE-2P和NE-PP为0.872、0.802、0.702;50个半同胞子代在403个疑似父本中检测出的最似父本LOD值均大于0,其中TXS-14的繁殖贡献率最高为6%,TXS-20、TXS-201、TXS-204、TXS-399、TXS-5的繁殖贡献率次之,为4%,其余均为2%,共鉴定出42个真实父本,选出高配合力亲本杂交组合50对。【结论】已发表的SSR标记能够用来对铁心杉半同胞子代优株进行父本鉴定,研究结果将为铁心杉种质资源圃的构建提供理论依据和进一步开展铁心杉分子辅助杂交育种奠定基础。
基金the National High-Tech Research & Development Program of China (2011AA0103)
文摘We summarized the design, fabrication challenges and important technologies for multi-wavelength laser transmitting photonic integration. Technologies discussed include multi-wavelength laser arrays, monolithic integration and modularizing coupling and packaging. Fabrication technique requirements have significantly declined with the rise of reconstruction-equivalent-chirp and second nanoimprint mask technologies. The monolithic integration problem between active and passive waveguides can be overcome with Butt-joint and InP array waveguide grating technologies. The dynamic characteristics of multi-factors will be simultaneously measured with multi-port analyzing modules. The performance of photonic integration chips is significantly improved with the autoecious factors compensation packaging technique.
基金supported by the Major Program of the National Natural Science Foundation of China (61090390)the National Basic Research Program of China (2012CB315702 and 2012CB315703)+2 种基金the Foundation for Innovative Research Groups of the National Natural Science Foundation of China (61021003)the State Key Program of the National Natural Science Foundation of China (61036012)the National Natural Science Foundation of China (61177060 and 61108002)
文摘The experimental optimization of a 10 GHz optoelectronic oscillator (OEO) based on a 1.55 μm directly modulated distributed feedback (DFB) laser is demonstrated in this paper. The phase noise of the directly modulated laser (DML) based OEO is significantly reduced by proper selection of the laser's bias current and by using a dispersion shifted fiber as a delay line. The phase noise performance of the DML OEO achieved after optimization is close to that of a conventional OEO constructed using a commercial DFB laser and a LiNbO 3 Mach-Zehnder modulator. The DML based OEO is most promising for future realization of a miniature OEO architecture with the components integrated on a semiconductor substrate.