淮北棉区花铃期冠层不同高度叶片光合特性的差异

基于多层二叶模型,在自然群体条件下,将棉花冠层分为上、中、下三层,研究淮北棉花花铃期冠层上、中、下层,阴叶(无直射光照射)与阳叶(有直射光照射)的光合特性的差异。结果表明,同一高度阳叶的光量子通量密度与光合速率显著大于阴叶;不同高度叶片光量子通量密度与光合速率均表现为上层阳叶>中层阳叶>下层阳叶,上层阴叶>中层阴叶>下层阴叶;上层阳叶气孔导度大于阴叶,中、下层阴、阳叶的气孔导度无显著差异;上部叶片气孔导度>中部叶片>下部叶片;同一高度阳叶胞间二氧化碳浓度显著小于阴叶,随着冠层深度(形态学自上而下)的增加,两者差异增大;不同高度叶片胞间二氧化碳浓度随着冠层深度的增加,呈增加趋势,阳叶差异不显著,阴叶差异显著。

983例正常人罗索里摩手反射调查报告

临床上经常遇到一些除双侧罗索里摩手反射阳性外无其它神经系统阳性体征的正常人,为了估计该反射的临床意义,笔者1985年在郑州市郊须水乡以随机抽样方法,调查983名正常人,现报告如下。检查方法罗索里摩手反射的作法是:

Dynamic Change Laws of Chlorophyll Fluorescence Parameters in Different Parts of Leaves of Ginkgo biloba

[Objective] The aim was to explore the dynamic change laws of chlorophyll fluorescence parameters in different parts of leaves of Ginkgo biloba.[Method] The G.biloba cultivated in North China was used as materials in this study to explore the law of daily change and ten-day change of the chlorophyll fluorescence parameters of leaves in different parts of leaves.[Result] The daily change of Fm（maximal fluorescence）,Fv（variable fluorescence）,Fv/Fm,Fm/Fo（electron transfer rate）,Fv/Fo（potential activity of PSⅡ）in leaves of G.biloba obviously presented a descending-ascending trend,the lowest value was at 12：00 and the NPQ（non-photochemical quenching）of sunny leaves arrived at the maximum at noon.The values of Fm,Fv,Fv/Fm,Fm/Fo,Fv/Fo in shade leaves of G.biloba were obviously higher than those in sunny leaves,but the peak value of NPQ of shade leaves presented earlier and higher,suggesting that the shade leaves might have more sensitive hot dissipation mechanism.Comparing to sunny leaves,shade leaves had the higher PSⅡ potential activity and inner light energy translation efficiency.[Conclusion] This study had provided theoretical basis for the protection of G.biloba resources.

Dynamic Variation and Simulation of Extinction Coefficient of Corn Population

[Objective] The aim was to study the dynamic variation of extinction coefficient of corn population, so as to improve the accuracy of assessment on net primary productivity （NPP） or yield. [Method] Based on the data of photosynthetic active radiation and leaf area index during corn growing season （from May to September） in 2006, observed in Jinzhou observation station of corn farmland ecosystem, China Meteorological Administration, the dynamic variation of extinction coefficient of corn population was analyzed. [Result] There was a great daily variation in the extinction coefficient of corn population during growing season, and the maximum value appeared from 7：00 to 9：00 and from 15：00 to 17：00, while the minimum could be found around 12：00, but the amplitude of variation decreased in tasseling stage. On a large time scale （5 d）, there was a parabolic relationship between extinction coefficient （K） and leaf area index （LAI）, with determination coefficient R2 of 0.960 7. The simulation equation of extinction coefficient, based on the sun elevation angle or leaf area index, had poor accuracy at various time during growing season, so a new dynamic model of extinction coefficient was established, namely K=λ（0.784 8-0.001 6θ）（0.154 8LAI2-0.558 6LAI＋0.654）. [Conclusion] The effect of sun elevation angle and leaf area index on extinction coefficient during corn growing season was considered in the new dynamic model of extinction coefficient, and its simulated result was superior to that of single-factor model.

我与这世界的旖旎

一直在写字,写花写草写内心风光。喜欢素朴的生活,一茶,一香,一墨,一纸。唯愿一生,好茶涤烦,好香熏德,好墨焕彩,好纸垂世。去过一个非常美的山村,遇到一户庭院深锁的人家。院落门口铺着高高的石阶,旁开一丛花。主人虽然不在家,但石阶干净,花正开着,仿佛一落脚,就走进画中。后来拍了照片,有人惊叹那石阶,问:"全是人工铺成的吗?"我回:"可能是鸟衔来石。

编读

BOY AND GIRL SHOW 01 B13号女生张濛方时光你别催,梦想我努力去追。时间还长,我们还小。双鱼座广东省梅州市梅县高级中学108班新浪微博:@牵着猪旅行02B14号女生王丹凡是过去,皆为序章。双鱼座湖北省石首一中高一(17)

福建省人民政府办公厅关于成立第四届福建同乡恳亲大会筹备工作指导小组的通知

各设区市人民政府,省直有关单位:第四届世界福建同乡恳亲大会(以下简称恳亲大会)定于今年5月16日在福州市召开。为加强对大会筹备工作的指导,做好各项筹备工作,确保恳亲大会取得圆满成功,经研究,决定成立恳亲大会筹备工作指导小组。

An Observation of Franois' Langurs Using Caves at Mayanghe National Nature Reserve, Guizhou, China

The utilization of caves is a rather rare phenomenon in nonhuman primates, found almost exclusively in those members of the genus Trachypithecus that share a preference for forest on limestone （karst） hills in Vietnam and southern China. Here we report a new case of usage of caves as overnight sleeping shelters by Franqois＇ or black langurs （Trachypithecusfraru;oisi） at Mayanghe National Nature Reserve in Yanhe County, Guizhou Province, China. We tentatively address three possible hypotheses that may account for the use of caves in Francois＇ langurs at Mayanghe： shelter against climatic conditions, acquisition of minerals and protection from predators. utilization

Using Fuzzy Theory and Variable Weights for Water Quality Evaluation in Poyang Lake, China

Achieving water purity in Poyang Lake has become a major concern in recent years, thus appropriate evaluation of spatial and temporal water quality variations has become essential. Variations in 11 water quality parameters from 15 sampling sites in Poyang Lake were investigated from 2009 to 2012. An integrative fuzzy variable evaluation(IFVE) model based on fuzzy theory and variable weights was developed to measure variations in water quality. Results showed that: 1) only chlorophyll-a concentration and Secchi depth differed significantly among the 15 sampling sites(P < 0.01), whereas the 11 water quality parameters under investigation differed significantly throughout the seasons(P < 0.01). The annual variations of all water quality variables except for temperature, electrical conductivity, suspended solids and total phosphorus were considerable(P < 0.05). 2) The IFVE model was reasonable and flexible in evaluating water quality status and any possible ′bucket effect′. The model fully considered the influences of extremely poor indices on overall water quality. 3) A spatial analysis indicated that anthropogenic activities(particularly industrial sewage and dredging) and lake bed topography might directly affect water quality in Poyang Lake. Meanwhile, hydrological status and sewage discharged into the lake might be responsible for seasonal water quality variations.

Influence of Na^+,K^+,Mg^(2+),Ca^(2+),and Fe^(3+) on filterability and settleability of drilling sludge

Solid–liquid separation is a vital step in drilling sludge disposal, and the filterability and settleability of drilling sludge are the main evaluating indicators for the separation process. The influence of Na^+,K^+,Mg^(2+),Ca^(2+),and Fe^(3+) on drilling sludge filterability and settleability was investigated in our research. The water content,filtration rate, supernatant volume and supernatant turbidity were measured to evaluate the filterability and settleability of drilling sludge. Meanwhile, the zeta potential, specific surface area of sludge flocs, particle size distribution and Fourier-transformed infrared spectra were employed to clarify the influencing mechanism.The experimental results showed that the filterability and settleability of drilling sludge were related to concentration and types of cations. Mg^(2+),Ca^(2+),and Fe^(3+) performed better than Na^+, K^+, and the cations with smaller hydrated radius got superior solid–liquid separation behavior at same valence. Finally, the spectra indicated that no chemical adsorption occurred between inorganic cations and drilling sludge flocs. The variation of surface charge and flocs growth after adding different inorganic cations were the reasons for the changes of the filterability and settleability.

Research on the Mechanism of Accelerator for Photocurable Resin in 3D Printing

The photopolymerization kinetics of cycloaliphatic epoxide and oxetane with accelerators were investigated with Real-time Fourier transform infrared spectroscopy(RT-FTIR).The consumption rates of epoxy group and oxetane group as a function of time were obtained by monitoring of the absorption peaks in the 789 cm-1 and 981 cm-1.The effect of accelerators type and the accelerating mechanism were discussed.In general,benzyl alcohol and its analogues with electron-donating substituents are useful accelerators for the cationic polymerization of cycloaliphatic epoxide and oxetane.Activated monomer mechanism and free-radical chain-induced decomposition of onium salt cationic photoinitiator account for the observed accelerating effect on the polymerization rate.

太行山南麓栓皮栎和刺槐光合作用-CO_2响应模拟

采用便携式光合仪(Li-6400XT)对太行山南麓栓皮栎、刺槐2个树种叶片光合作用-CO_2响应曲线进行测定,利用直角双曲线模型(RH)、非直角双曲线模型(NRH)以及直角双曲线的修正模型—叶子飘模型(YZP)进行曲线拟合,并对3种光合模型的拟合参数(最大净光合能力A_(max)、初始羧化速率η、光呼吸速率R_p、CO_2补偿点CCP和CO_2饱和点CSP)进行比较.结果表明:与NRH和YZP模型相比,RH模型所得的A_(max)、η、R_p和CCP较高,分别高出实测值59.8%、128.6%、133.4%和19.8%.与RH模型和YZP模型相比,NRH模型拟合得出的A_(max)较大,高于实测值11.1%,η、R_p和CCP接近于实测值.YZP模型能较好地模拟光合作用对CO_2的饱和现象,在A_(max)和CSP的拟合效果上较好.栓皮栎阴叶的A_(max)、R_p和CCP比阳叶分别低31.3%、5.2%和14.3%.刺槐阴叶的A_(max)、R_p和CCP分别高出阳叶23.5%、11.0%和5.4%.栓皮栎、刺槐阴叶的η分别比阳叶高6.9%和7.0%.刺槐叶片的R_p和CCP与温度、光强均具有显著线性关系,η与气孔导度(gs)具有显著线性关系.栓皮栎叶片的η与光强和气孔导度具有显著线性关系,CCP主要受温度和湿度影响.栓皮栎叶片的A_(max)与相对湿度和gs具有显著的正线性相关关系.

太阳辐射变化对亚热带人工常绿针叶林总初级生产力影响的模拟分析

太阳辐射是陆地生态系统碳水循环的能量来源。太阳辐射的变化对植被吸收大气CO2具有重要影响。该文通过辐射观测数据建立散射辐射比例与晴空指数的关系,结合生态过程模型(BEPS)和通量观测数据,模拟分析了太阳辐射变化对千烟洲常绿针叶林总初级生产力(GPP)的影响。研究结果表明:千烟洲森林生态系统的阴叶对年GPP总量的贡献达67%,太阳辐射变化对阴叶光合作用的影响决定了冠层GPP的变化;太阳辐射强度和分布的年际差异导致年GPP对太阳辐射变化的响应不同,2003、2004和2005年太阳辐射分别变化–5.44%、–1.83%和6.26%,可使千烟洲生态系统当年GPP总量达到最大值;在季节上,太阳辐射的增加会导致5–6月GPP上升,7–9月GPP下降,使年GPP变化程度降低;在天尺度上,晴空指数在0.43时,太阳辐射变化对GPP的影响最小。

太行山南麓栓皮栎和刺槐叶片光合光响应模拟

植物光合作用-光响应模型研究是评价植物光合响应机制和获得光合参数的主要途径。本文以太行山南麓栓皮栎(Quercus variabilis)和刺槐(Robinia pseudoacacia)人工林为研究对象,采用LI-6400XT光合测定系统测定了这两种人工林叶片光合作用-光响应曲线,利用直角双曲线模型(RH)、非直角双曲线模型(NRH)以及直角双曲线的修正模型-叶子飘模型(YZP)对光合-光响应曲线进行了拟合,对比了3种模型的最大净光合速率P_(max)、初始光能利用率α、暗呼吸速率R_d等光合参数。结果表明,RH模型的P_(max)、α和R_d均较大,并且无法直接得到光饱和点I_s。NRH模型不能很好地模拟光抑制现象,在P_(max)的模拟上明显偏大,但在α的模拟中比较接近真实值。YZP模型则具有更好的适用性,能较好地模拟光抑制现象。对栓皮栎和刺槐阴、阳叶光合作用-光响应曲线研究发现,阳叶的P_(max)大于阴叶(栓皮栎、刺槐的阳叶P_(max)分别高出阴叶的24.41%和18.28%),阴叶的α高于阳叶(栓皮栎、刺槐的阴叶α值分别平均高出阳叶的22.08%、15.41%),阴叶的R_d也高于阳叶,尤其在刺槐上表现明显(刺槐阴叶R_d高出阳叶的7.13%)。栓皮栎P_(max)、R_d和I_s主要受相对湿度和气孔导度的影响,α主要受相对湿度的影响。刺槐的P_(max)和I_s与相对湿度和气孔导度均呈显著正相关关系。

叶挺祖籍在兴宁

据《南阳叶氏族谱大全》所记,叶挺将军祖先发脉于春秋南阳叶邑(今河南省境内)。叶邑县今沈诸梁因有功于楚,楚王以邑赐姓。诸梁公即为叶姓始祖。传至八十五世(南阳世)大经公,为闽(今福建)制置使。后为避元朝兵乱,迁至广东梅州。大经公即为梅州开基祖。传至十三世(梅州世)僖公迁兴宁黄陂(龙归洞)。僖公即为兴宁开基祖。至三世(兴宁世)满山公迁兴宁合水溪唇。传至十二世特盛公,又于清康熙元年(1662)从兴于迁惠阳县秋长镇周田村,为惠阳开基祖。此后再未迁徙。至叶挺将军为二十世(南阳世一百一十六世)。

哥德堡的变奏 罗莎琳·图蕾克

17世纪中叶的漫漫长夜里,德累斯顿的俄国使臣凯瑟林(Hermann Karl Von Keyserlingk)伯爵官邸里经常有人弹奏《哥德堡变奏曲》,目的很简单,仅仅为了帮助患有失眠症的伯爵消磨长夜时光,减轻彻夜不眠的痛苦。弹奏者是青年演奏家哥德堡(Johan Theophil Goldberg),他亦是巴赫(J.S.Bach)的学生,这组曲目便是他求巴赫所作。如今,人们能在市面上找到40多张巴赫《哥德堡变奏曲》的演奏录音,以至于有位颇为伤心的小提琴教师不知何去何从,不再热衷于教授学生演奏巴赫作品。

中国家庭幸福成长计划 公益微讲堂

关系影响幸福心态决定状态智慧改变人生幸福是所有人的愿望但在通往幸福的路上我们常常迷失离婚率逐年攀升外遇出轨成为婚姻杀手不良亲子关系困扰着父母……还有人说,中国家庭=缺席的父亲＋焦虑的母亲＋失控的孩子现实真是如此吗？我们该怎么做,才能重新拥有幸福的家庭？马上加入《婚姻与家庭》杂志联合多家心理机构共同发起的中国家庭幸福成长计划吧!在这里,我们将为您邀请国内顶级师资,包括专家、学者、明星、幸福夫妻,各领域的生活达人,为大家奉上一场场精彩的讲座。