节水型自动洗根装置的研制及其应用

该介绍的是一种节水型自动洗根装置。对比实验表明，这种装置既可靠又高效，并具节水、自动化程度高、轻便、易操作、不需特别的配套设备、制作材料易得及成本低廉等优点，可广泛用于根系研究测定。     

基于暗目标法和GF-1的农作物光合有效辐射反演

光合有效辐射是农田生产力和产量估算的依据,也是农作物参数遥感反演的主要研究内容。该文基于大气辐射传输模型,选择覆盖山东禹城市2014年4月－2014年12月共12景GF-1/WFV（wide field view,WFV）数据,结合浓密植被（暗目标）蓝光波段、红光波段之间反射率的线性关系,基于查找表（look-up table,LUT）技术反演了大气气溶胶光学厚度（aerosol optical depth,AOD）等大气参数,提出了基于蓝、绿、红3个离散波段反演光合有效辐射（photosynthetically available radiation,PAR）的算法。其中,浓密植被是根据WFV/NDVI（normal differential vegetation index）设置阈值的方式筛选的;红光波段与蓝光波段地表反射率的比例系数为1.7977,截距为0.0034,相关系数达0.9826,是根据美国地质调查局（U.S. Geological Survey,USGS）提供的典型植被波谱库数据理论计算获取;GF-1/WFV数据蓝、绿、红波段转换为400～700 nm谱段间光合有效辐射值之间的转换系数分别为0.09156、0.09951、0.1007。采用中国生态系统研究网络禹城实验站实测的 PAR 数据进行对比验证,光合有效辐射的总体精度达到了95.77%,误差绝对值平均为11.36 W/m2,平均误差小于5%,表明了该方法具有较高的精度。该方法不需要额外辅助数据,产品生产过程简单,是比较理想的GF-1/WFV数据光合有效辐射业务反演备选算法。     

粮田土壤磷、钾养分的垂直分布特征

本文研究了粮田土壤磷、钾养分垂直分布特征。结果表明 ,0～ 2 0 cm土层 N( NH4 - N)、P、K、Mn、Zn、Fe、Cu等主要养分速效含量明显高于 2 0～ 4 0和 4 0～ 60 cm土层 ,其中 0～ 2 0 cm土层 P含量数倍高于 2 0～ 4 0和 4 0～ 60 cm土层 ,显示磷肥应尽可能深施 ,以提高下部土层 P素肥力 ,2 0～ 4 0和 4 0～ 60 cm土层养分含量差异不大。不同施肥措施对上部土层 ( 0～ 2 0 cm) P、K等养分含量有较明显影响 ,而对下部土层 ( 2 0～ 4 0和 4 0～ 60 cm) P、K等养分含量影响较小     

Molecular genetic and chemical assessment of Rhizoma Curcumae in China

Rhizoma Curcumae (Ezhu) is a traditional Chinese medicine that has been used in removing blood stasis and alleviating pain for over a thousand years. Three species of Curcuma rhizomes are being used, which include Curcuma wenyujin, Curcuma phaeocaulis, and Curcuma kwangsiensis. In China, the production of Rhizoma Curcumae largely depends on agricultural farming. The essential oils are considered as active constituents in Rhizoma Curcumae, which include curdione, curcumol, and germacrone. On the basis of the yield of curdione, curcumol, and germacrone in an orthogonal array design, the optimized extraction condition was developed. The amounts of these compounds within essential oils in Rhizoma Curcumae varied according to different species and their regions of cultivation. Chemical fingerprints were generated from different species of Curcuma, which therefore could serve as identification markers. In molecular genetic identification of Rhizoma Curcumae, the 5S-rRNA spacer domains of 5 Curcuma species, including the common adulterants of this herb, were amplified, and their nucleotide sequences were determined. Diversity in DNA sequences among various species was found in their 5S-rRNA spacer domains. Thus, the chemical fingerprint together with the genetic distinction could serve as markers for quality control of Curcuma species.     

磁化水对黄瓜叶片氮磷钾钙镁含量的影响

以当地冬春茬保护地品种寒秀、鲁圣顶峰1号为试材，研究了磁化水对黄瓜叶片氮、磷、钾、钙、镁含量的影响。结果表明：叶片生长发育期间，黄瓜叶片氮、磷含量呈单峰曲线变化；钾、钙、镁含量呈双峰曲线变化。磁化水处理后，寒秀叶片内磷、镁含量极显著高于对照，钙含量显著高于对照，氮、钾含量差异不显著；鲁圣顶峰1号磷、镁含量极显著高于对照，氮、钾、钙含量差异不显著。     

非饱水冻融作用下的古砖动弹性模量

在对我国北方销售的冻梨品种、产地来源、制作方式及存在问题进行实地调查的基础上,对冻梨的生产历史、文化、品种特性及研究现状进行综述与分析,并提出我国冻梨产业需要解决的问题及今后的研究方向。     

Preprocessor of Reinforced Concrete FEM Analysis

Reinforcing element and concrete element have effects on the order of the stiff-matrix of the reinforce-concrete FEM. The program divided the elements is programmed by FORTRAN language in current analysis, and the data of the elements are stored by the array. The stiff-matrix of the reinforce-concrete FEM is extended by the large residual between the serial numbers of the nodes of cohering element. This paper establishes the graph class, path class and point class via objectoriented programming. The storage of the points and the paths by the chain structure realization of copying graph, moving graph, adding graph, continuously numbering the cohering elements are built. This paper presents the example of the dividing domain with the crack.     

高产优质西瓜对氮,磷,钾的吸收及分配规律

研究表明，西瓜苗期对氮、磷、钾的吸收很少。随着植株的生长逐渐增多，抽蔓到一棚瓜成熟期间对氮的吸收有明显的线性关系，回归方程为ｙ＝０．１４１９ｘ－５．３８７８，ｒ＝０．９９７１＊＊。座果后对磷的吸收逐渐增多；开花结果后对钾的吸收逐渐增多。西瓜植株对、氮、磷、钾的分配在结果前主要用于叶的发育和建成，其次是茎、根的生长；座果后，逐渐转向果实的发育     

光敏核不育水稻存在BT型等位不育基因及其遗传关系的研究

农垦58s及其转育于不同遗传背景的光敏核不育水稻与BT型不育水稻六千辛A和寒丰A杂交,得到的F_1植株完全不育,证明农垦58s不育的2对隐性基因中有1对来源于农垦58,即为与BT型水稻等位的不育基因.由此推论农垦58s源于农垦581个基因位点的突变,而它的光敏不育性则为此突变基因和原有不育基因重叠作用的结果.当用作光敏不育的恢复亲本原已存在或不存在BT型水稻不育基因,决定了它们杂种F_2代的可育株和不育株呈3:1或15:1不同的比率分离.     

Movement of mud snails affects population dynamics,primary production and landscape heterogeneity in tidal flat ecosystems

Landscape Ecology - Animal movements influence the spatial heterogeneity of variously ecosystem processes. However, our understand of how movement in heterogeneous landscapes shapes ecological...