基于逻辑回归的植物新品种权质量评估研究——以杂交水稻品种权为例

随着植物新品种权的申请授权量急剧增长,品种权的"数量多、质量差"的问题引起了全社会的普遍关注。如何评价品种权质量成为重要的理论和现实问题。为了科学合理地判断我国品种权的综合质量水平,首先从竞争力的角度界定植物新品种权质量的定义,然后从品种权的法律、技术和经济三大属性建立品种权质量评价指标体系,并利用均值差异法验证品种权质量指标的有效性,最后采用逻辑回归模型构建品种权质量综合指数,以便全面、快捷地综合评价品种权质量。植物新品种权质量评估研究不仅有利于解决品种权质量判断标准问题,对提高品种权质量水平提供了理论依据,而且为我国品种权的价值评估、许可转让、融资、抵押等交易活动提供重要参考。     

海绵体式复合植被毯及屋顶绿化技术

屋顶绿化是改善城市生态环境的重要途径,具有良好的生态和社会效益,但对建设投资方来说一次性投入增加较大,推广难度较大。为此,该文从海绵体式复合植被毯工艺与屋面施工流程等方面进行系统的介绍,突破传统的植被毯屋顶绿化形式,形成了一套造价低、维护简易,又有良好生态效益的海绵体式复合植被毯屋顶绿化形式。     

Impact of heat stress,nutritional restriction and combined stresses (heat and nutritional) on growth and reproductive performance of Malpura rams under semi‐arid tropical environment

A study was conducted to assess the combined effect of heat stress and nutritional restriction on growth and reproductive performances in Malpura rams. Twenty‐eight adult Malpura rams (average body weight (BW) 66.0 kg) were used in this study. The rams were divided into four groups: CON (n = 7; control), HES (n = 7; heat stress), NUS (n = 7; nutritional stress) and COS (n = 7; combined stress). The study was conducted for a period of 2 months. CON and HES rams had ad libitum access to their feed while NUS and COS rams were under restricted feed (30% intake of CON rams) to induce nutritional stress. The HES and COS rams were kept in climatic chamber at 42 °C and 55% relative humidity for 6 h a day between 10 : 00 h and 16 : 00 h to induce heat stress. Body weight increased significantly (p < 0.05) in CON as compared to NUS and COS. When compared within groups, scrotal width morning, scrotal width afternoon, scrotal circumference morning and scrotal circumference afternoon were significantly (p < 0.05) larger in CON while smaller in COS rams. The higher testicular length was recorded both during morning (p < 0.05) and afternoon (p < 0.01) in COS rams while the lowest in NUS rams. The highest plasma testosterone concentration was recorded in CON and lowest in COS rams. Semen volume and mass motility also differed significantly (p < 0.05) between the groups. The highest semen volume and mass motility was recorded in CON and NUS while lowest in both HES and COS rams. It can be concluded from this study that when two stressors occur simultaneously, they may have severe impact on reproductive performance of rams.     

Effects of different dl‐selenomethionine and sodium selenite levels on growth performance,immune functions and serum thyroid hormones concentrations in broilers

This trial was conducted in a 2 × 3 + 1 factorial arrangement based on a completely randomized design to evaluate the effects of different dl ‐selenomethionine (dl ‐Se‐Met) and sodium selenite (SS) levels on growth performance, immune functions and serum thyroid hormones concentrations in broilers. A total of 840 Ross 308 broilers (7 days old) were allocated by body weight to seven treatments (three replicates of 40 birds each treatment) including (1) basal diet (containing 0.04 mg of selenium (Se)/kg; control) without supplementary Se; (2, 3 and 4) basal diet + 0.05, 0.15 or 0.25 mg/kg Se as SS; (5, 6 and 7) basal diet + 0.05, 0.15 or 0.25 mg/kg Se as dl ‐Se‐Met. The experiment lasted 42 days. The results revealed that dietary Se supplementation improved (p < 0.05) average daily gain, feed efficiency, immune organ index, serum immunoglobulin A (IgA), immunoglobulin G (IgG), immunoglobulin M (IgM) and triiodothyronine (T₃) concentrations and decreased (p < 0.01) thyroxine (T₄)/T₃ ratio in serum compared with the control. Broilers receiving the dl ‐Se‐Met‐supplemented diets had higher (p < 0.05) feed efficiency, thymus index, the amounts of IgA, IgG, IgM and T₃ as well as lower (p < 0.05) serum T₄ concentrations and T₄/T₃ ratio than those consuming the SS‐supplemented diets. Serum IgA and IgM levels of broilers fed 0.15 mg Se/kg were significantly higher (p < 0.05) than those of broilers fed 0.05 or 0.25 mg Se/kg. In summary, we concluded that dl ‐Se‐Met is more effective than SS in increasing immunity and promoting conversion of T₄ to T₃, thus providing an effective way to improve the growth performance of broilers. Besides, based on a consideration of all experiment indices, 0.15 mg Se/kg was suggested to be the optimal level of Se supplementation under the conditions of this study.     

济源市蔬菜产业发展现状与对策

对济源市蔬菜产业的生产、销售、管理等现状进行了调查,指出当前蔬菜产业发展中存在的主要问题,结合济源市蔬菜产业实际情况,提出相应的发展对策。     

葫芦砧木低温处理鉴定方法研究

对2个具有低温抗性差异的葫芦砧木A12、A05及西瓜TRM进行低温处理,试验结果表明,葫芦幼苗(0.43~0.71)的低温抗性显著高于西瓜(1.0),4℃条件下A12的耐低温性高于A05,6℃条件下相反;3叶期2个砧木间冷害指数差异显著,且叶绿素含量变化均达极显著,叶绿素含量变化程度与冷害指数具有显著正相关(R2=0.65),因此,叶绿素含量可以作为耐低温葫芦砧木材料选择的一个标准,且3叶1心期6℃为相对较好的低温处理条件。     

松口蘑菌塘土壤理化特性对子实体营养品质影响

以四川松口蘑(Tricholoma matsutake)代表性主产区菌塘土壤及新鲜子实体为材料,分析菌塘土壤理化性质和子实体的营养品质,利用冗余分析(redundancy analysis,RDA)研究前者对后者的影响.结果表明:调查样点菌塘土壤理化性质差异较大,总体以砂粒为主(50.2％～88.5％),质地较为疏松,pH总体呈弱酸性(5.08～7.26),有机质含量54.8～189.6 g/kg;调查样点松口蘑子实体营养品质总体较好,其中谷氨酸含量较高(2.27％～4.10％),但地区间差异较大;钙含量较高(124.4～725.1 mg/kg),锌和锰含量中等,铜含量较低;冗余分析结果表明,子实体中营养品质与菌塘土壤中交换性锰(TMn)含量极显著正相关(P＜0.01).菌塘土壤中TMn是影响松口蘑子实体关键的土壤理化因子.     

Assessment of the hip reduction angle for predicting osteoarthritis of the hip in the Labrador Retriever

Hip palpation has been used to provide semiquantitative information regarding passive joint laxity and susceptibility to hip dysplasia. The purpose of this study was to: (1) evaluate the intra- and inter-examiner repeatability of the hip reduction angle measured at 4 months of age by three examiners using manual goniometry and an electromagnetic tracking system; (2) compare the hip reduction angle measured with manual goniometry to the hip reduction angle measured with the electromagnetic tracking system; and (3) evaluate the hip reduction angle, distraction index and Ortolani manoeuvre at 4 months of age as predictors of the development of hip osteoarthritis at 12 months of age in 11 Labrador Retriever dogs. Intra- and inter-examiner repeatability was demonstrated for both the manual and electromagnetic goniometric measurement of the hip reduction angle (coefficient of variation < 4.3% and < 6.1%; and P = 0.163 and P = 0.836 respectively). The hip reduction angle measured by manual goniometry was moderately correlated to the hip reduction angle measured by the electromagnetic tracking system (r = 0.603, P < 0.0000). The hip reduction angle measured by manual and electromagnetic goniometry was a poor predictor of osteoarthritis at 12 months of age (r = 0.231, P < 0.062, and r = 0.321, P < 0.01). The distraction index was moderately correlated with the development of osteoarthritis by 12 months of age (r = 0.493, P < 0.0000). The Ortolani sign was sensitive (100%) but not specific (41%) for the development of osteoarthritis at 12 months of age. The hip reduction angle did not further quantify the Ortolani manoeuvre as a predictor of osteoarthritis in Labrador Retrievers.     

基于AHP-EWM-TOPSIS的温室辣椒最佳调亏灌溉方案优化研究

辣椒对土壤水分非常敏感,传统的灌溉方式以单一追求高产为目的,对农作物进行大量灌溉,辣椒产量的提高往往伴随品质的下降。为选出能平衡产量和品质的最优调亏灌溉方案,本试验以辣椒为研究对象,以全生育期充分供水(75%～85%θ_f,θ_f为田间持水量)作为对照(CK),在3个调亏时期(苗期M、花期H和果期G)分别设置2种调亏程度(轻度水分调亏LS:65%～75%θ_f,重度水分调亏SS:55%～65%θ_f)和2种调亏历时(短期调亏：连续亏水4 d,长期调亏：连续亏水8 d),研究不同调亏处理对辣椒生长、产量和品质的影响。结果表明,在各生育期进行调亏灌溉均会减小辣椒株高、茎粗、叶面积及营养器官干物质。与花期和果期相比,苗期水分调亏对辣椒生长指标及营养器官干物质的抑制程度最大,尤其在苗期长期重度水分调亏(MSS-8)下,营养器官干物质最少,较CK下降27.85%。另外,苗期和花期适度的水分调亏有利于提高辣椒生殖器官干物质和产量,其中,苗期短期轻度(MLS-4)、苗期长期轻度(MLS-8)及花期短期轻度(HLS-4)水...