涝渍胁迫下3个树种幼苗生理特性的响应

通过为期60 d的田间模拟试验,以1年生落羽杉、美国山核桃和乌桕实生苗为试材,对3树种在涝渍胁迫下的适应性和生理调节机制进行了初步研究。结果表明：（1）3树种具有不同程度的耐涝能力。在淹水和渍水胁迫的前30 d,3树种叶片内的超氧化物歧化酶（SOD）和抗坏血酸过氧化物酶（ASA-POD）活性,以及抗坏血酸（ASA）、还原性谷胱甘肽（GSH）、脯氨酸（Pro）含量和可溶性蛋白(SP)含量皆呈显著上升趋势。（2）3树种耐涝能力存在显著差异,其中落羽杉的耐涝性最强,美国山核桃的次之,乌桕的最弱。在50 d的淹水胁迫期内,落羽杉叶片或根系中的SOD等6个指标的平均增量显著超过美国山核桃和乌桕,而且前者可保持连续增长并维持在较高水平,而美国山核桃和乌桕在水分胁迫30 d后呈现大幅下降趋势。（3）3树种的耐水机制可能与形态建成、酶促和非酶促抗氧化、渗透调节等适应性环节的启动有关。     

落羽杉属新品种‘中山杉111’和‘中山杉125’

【目的】落羽杉属(Taxodium)植物具有耐涝性,在低洼湿地林业生产中具有巨大的生态价值和经济价值,优良品种选育对于该属的开发利用具有重要意义。【方法】以墨西哥落羽杉为母本、池杉为父本开展人工杂交育种,并对获得的后代实生群体进行观察和选育。【结果】‘中山杉111’(品种权号:20200409)和‘中山杉125’(品种权号:20200410),具有干形好、生长快、耐水湿、景观价值高等优良特性,通过观察比较,新品种表现一致且稳定。【结论】‘中山杉111’和‘中山杉125’是优良的落羽杉属新品种,可在我国长江流域、东南沿海及内陆地区的湖泊湿地、水网、滩涂和平原绿化造林中栽植。     

海岸带杨柳新无性系苗期耐盐性研究

在海岸带滨海盐土上设计并实施了类似于盆裁试验的局部控制地栽耐盐试验,研究海岸带4种盐度梯度下12个杨柳新无性系的耐盐阈值。结果表明：杨柳新无性系的成活率、保存率和生长量随着土壤含盐量的增加而降低,且不同树种、不同无性系在不同生长期的耐盐能力不同：不同时期同一杨柳新无性系的极限耐盐量相差0.06％～0.15％。另外,对树木耐盐试验评价指标体系的建立、树木耐盐阈值表示法、夏季土壤含盐量作为树木耐盐闽值的可行性和近似盆栽的蜀部控制地栽耐盐试验研究法等进行了论述。     

土壤盐分及水分含量对落羽杉光合特性的影响

应用温室盆栽试验方法，采用完全随机试验设计，研究了1年生落羽杉实生苗在不同土壤盐分和水分条件下的光合特性。结果表明，在各种土壤水分条件下，落羽杉净光合速率、气孔导度、叶绿素a和叶绿素b的浓度、叶绿素含量都随着土壤盐分浓度的增加逐渐减少，细胞间隙CO2浓度、叶绿素a与叶绿素b比值逐渐增大，蒸腾速率和呼吸速率因土壤水分的不同随土壤盐分浓度的增加表现出不同的变化趋势；在各种土壤盐分条件下，随着土壤水分含量的降低，落羽杉净七合速率逐渐下降，细胞间隙CO2浓度、叶绿素a浓度和叶绿素含量均在土壤含水量为田间持水量的75％处理下最高，蒸腾速率、气孔导度、呼吸速率、叶绿素b浓度和叶绿素a与叶绿素b比值因土壤盐分的不同随土壤水分含量的降低有不同的变化趋势；在土壤水分供应充足的条件下，落羽杉净光合速率随着土壤盐分浓度的升高而下降主要是非气孔限制所致，而在干旱条件下，落羽杉净光合速率随着土壤盐分浓度的升高而下降则有气孔限制和非气孔限制两种原因，盐胁迫导致叶绿素a浓度的下降也是落羽杉在盐胁迫下净光合速率下降的原因之一。     

小麦耐盐细胞系脯氨酸SOD酶核酸和蛋白质合成动态分析

对已筛选出的小麦耐盐细胞系的耐盐稳定性进行有关生理、生化分析。结果表明：耐盐细胞系脯氨酸含量不仅稳定,而且高于对照;ＳＯＤ活性在耐盐系增加,耐盐系对一定的盐浓度损伤ＤＮＡ修复能力大于对照系,耐盐系ＲＮＡ和蛋白质合成量分别是对照的５．４和４．５倍,并对小麦耐盐性的有关问题进行了讨论。     

多功能金属涂料

叙述了我功能金属涂料的原理、制备方法和检测情况，同时证实该涂料具有耐水、耐热、耐酸、耐摩擦、耐日晒、耐有机溶剂浸蚀以及可以带锈、带水、带油进行涂敷等特点。该种涂料使用时操作安全，施工方便，不污染环境。     

多功能金属涂料

叙述了多功能金属涂料的原理、制备方法和检测情况，同时证实该涂料具有耐水、耐热、耐酸、耐碱、耐摩擦、耐日晒、耐有机溶剂浸蚀以及可以带锈、带水、带油进行涂敷等特点．该种涂料使用时操作安全，施工方便，不污染环境     

干旱胁迫对青檀等树种苗木生长及生理特性的影响

用盆栽法设置3种土壤相对含水量(W1：土壤含水量为田间持水量的75％左右;W2：土壤含水量为田间持水量的50％左右;W3：土壤含水量为田间持水量的25％左右),研究了青檀、落羽杉和绒毛白蜡1年生苗生长及生理指标的动态变化,比较了3个树种之间抗旱能力的大小。结果表明：在干旱胁迫下,各树种间相对根系活力以青檀最大,绒毛白蜡次之,落羽杉最小;对细胞膜伤害程度表现为落羽杉最严重,绒毛白蜡次之,青檀最轻;SOD含量以青檀最高,绒毛白蜡次之,落羽杉较差;MDA含量则以落羽杉最高,绒毛白蜡次之,青檀最低;生长表现为青檀最好,绒毛白蜡次之,落羽杉较弱。     

重阳木在非规划林地中的应用

重阳木作为南方的乡土绿化树种,因其生长快速、深根,抗空气污染、抗风、耐盐、耐水湿且耐阴等诸多优良习性和用途而成为城市绿化及林相改造的代表性树种之一。文章重点介绍了重阳木大树移植及养护,并针对其树叶“夏绿秋红”的观赏价值阐述了重阳木在园林绿化建设中的独特作用。进一步推广重阳木在城市绿化中的应用。     

三种荒漠植物幼苗对NaCl胁迫的叶绿素荧光响应

了解极干旱区沙漠过渡带植物的耐盐能力有利于揭示其耐盐机制,保护和利用这些植物。叶绿素荧光技术被使用,以研究NaCl胁迫对温室培养的三种植物骆驼刺(Alhagi sparsifolia)、罗布麻(Apocynum venetum)和盐穗木(Halostachys caspica)幼苗叶片光系统II的影响,NaCl胁迫导致骆驼刺和罗布麻叶片PSII最大量子产量(Fv/Fm)下降,但是引起下降的原因不同——骆驼刺的Fm不变而Fo增加,而罗布麻则是增加初始荧光Fo同时降低最大荧光Fm,盐胁迫对盐穗木影响不大。盐胁迫也诱导了三种植物光适应能力的降低,其中以骆驼刺和罗布麻下降明显。三种植物对NaCl胁迫的忍耐能力排序为盐穗木>骆驼刺>罗布麻。     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.