查询词典 systematic tree

The project team has taken loess, lacustrine and peat sediments and tree ring as the research carrier, a systematic study has been carried on the warm phases of the different period (60-25 ka, last deglaciation, Holocene, the recent e few hundred years) and the last interglaciation on the basis of the extensive field investigation and laboratory analysis.

项目组以黄土、湖沼和树轮等沉积物为研究载体，经过大量的野外考察和实验室分析测试，对我国半干旱带末次间冰期和距今六万年以来不同时间段的温暖期（6万年到2.5万年、末次冰消期、全新世、最近几百年）进行了系统的研究，取得了一批重要的阶段性成果，确认了东亚季风气候和温暖期的不稳定性特征。

Two-dimensional scatter plot of principal axes analysis,systematic cluster tree and the minimal spanning tree on the basis of niche overlaps were drawn,which revealed the ecological similarity of 42 moss species.The combinative application of principal axes analysis,systematic cluster analysis and minimal spanning tree method on the basis of niche overlaps could express the ecological similarities among species intuitively.

以此为指标，分别应用主坐标排序、图论聚类及系统聚类分析方法，作出了反映42种地面藓类的种间生态关系的二维投影图、最小生成树和动态聚类图。3种方法相结合，能够对生态位重叠值矩阵进行直观地表达，并使所表达的藓类种间关系具有确切的生态学含义。

Tricholoma may be a paraphyletic genus two. The collections identified as T. caligatum is a mixture. Some parts of them from France are members of T. matsutake, the other parts from North America are closed to T. bakamatsutake and T. fulvocastaneum. Tricholoma robustum and T. focale form a clade which is obviously a sister group of the stirp Subannulate. The stirp Caligata was defined as a group mainly on the basis of the predominant veil. But from the result of molecular systematic analysis, the presence of veil is not a stable character in the matsutake group. Species having symbiosis with conifers and broad leaf tree are all transformed from those whose host specificity is not strict. The phylogenetic tree based on ITS sequences resembled the tree of NJ algorithm based on cladistic coding. In the phylogenetic tree based on morphylogical characters, T. zangii and T. bakamatsutake form a clade, but it is the result of convergent evolution as suggested by molecular analyses. The distribution area of the matsutake group can be divided into six regions: middle and northern Europe region, Mediterranean region, Hengduan Mount.— Southeastern Tibet region, Northeastern China—Japan—Far-east Russia region, the Atlantic—North America region and the Rocky Mountain region. The abundance center of the matsutake group are Hengduan Mount.—Southeastern Tibet region and the Rocky Mountain region. Hengduan Mount.

松口蘑群的分子系统学研究得出的结果有：由于粗壮口蘑和羽衣口蘑明显和亚环族(Tricholoma，section subannulate)的种类是来自同一个谱系，和其它松口蘑群的种不具有最近共同祖先，因此松口蘑群是一个多系群；松口蘑群和口蘑属其他种类的亲缘关系比和蜜环菌属更接近；梭柄松苞菇和松口蘑群的差距明显小于油黄口蘑(T.flavovirens)和棕灰口蘑；口蘑属是一个多系群；鉴定为欧洲口蘑的标本明显不是一个单系群，其中一部分是松口蘑，另一部分和黄褐口蘑及傻松口蘑(T.bakamatsutake)比较接近；划分松口蘑群的标准是菌环的存在，但从分子系统学的结果来看，菌环的存在与否并非是一个很稳定的性状；和针叶树专性共生及和阔叶树专性共生均由寄主专化性不强的种类转化而来；在形态学系统发育树上青冈口蘑和傻松口蘑被聚为一个分枝，分子系统学的研究结果表明，这是趋同进化的结果；用支序方法编码作出的NJ树的结果更接近ITS序列的结果。

The main purpose of careful observations on external appearance and internal anatomy is to throw light on the evolution of the modem family Pinaceae:To Pinus, attention is paid to the relation of different subgenera, sections and subsections; to Pseudoaraucaria and Pityostrobus, through analysis of the extinct types, trying to clear the evolution relations among all genera so as to finish the systematic tree is of most importance. Currently there are two hypotheses, i.e. Pinus center theory and Pseudoaraucaria branch theory.

对松科化石球果进行细致的外部形态及内部结构的研究主要目的在于演化关系的探讨上：对于Pinus，主要探讨这个属内各个亚属、组、亚组之间的演化关系；对于Pityostrobus和Pseudoaraucaria，通过绝灭类型的分析，探索松科内各个类群的演化关系进而完成进化树是研究的主要方向，现在这方面已有了Pinus中心说及Pseudoaraucaria分支说两个假说。

Themain results are as follows:(1)The utilization-oriented silvicultureshould be regarded as a silvicultural regime or system,that can bestsatisfy the special economic,social or ecological demand for a given regionwith lowest cost and fast speed,using specifically oriented,systematic andadvanced technical measures on the basis of characteristics of tree species,natural and economic conditions and local technical and development levels.

主要研究结果如下：(1)定向培育应该做为一种森林培育制度来对待，即定向培育是根据经济、社会和生态上的特定要求，确定相应的培育目标，然后根据造林地区和造林地的条件，造林树种或树种组合的特性，以及当地经济和技术水平，采用相应专向，系统、先进、配套的培育技术体系，以可能的最低成本和最快速度，达到定向要求的一种森林培育制度。

It's necessary to have a simple and systematic digital model in thinning decision-making. In the paper, the tree location map of 150 m x 30 m Luanta-fir in Hui-Sun Forest Experimental Station were digitized in GIS and thinning simulation by random, Telathaki-Wadali-Chi, DBH class and crown competition index method.

本研究系利用GIS 配合林木位置图，以惠荪林场之150m x 30m 香杉采穗园为研究材料，以生产大径材为目的的考量下，针对疏伐木之选择，利用随机法、寺崎渡氏法、胸径级法、树冠指数法等四种方法加以模拟、评估、探讨。

Based on the above analysis and systematic design concept, VC++ language was employed to program for the tree image segmentation system and the tree crown recognition system and some still images were processed by the systems.

论文最后对树形识别系统在农药精确对靶喷雾中的应用进行了分析，从理论上研究了树木的类型同精确喷雾之间的关系，结合已识别出的树形及其相关参数，同时输入喷雾的相关参数，最终确定工作喷头的重叠量δ〓，从而作出判断，输出控制信号，决定工作喷头的数量及可变量喷雾技术的应用，以达到精确喷雾的目的。

This paper has made systematic research about characteristics of soil water dynamic changes, water deficit of the root-zone of pear-jujube tree with regulated deficit irrigation, physiological control in the process of the water use and the stomal response mechanism of pear-jujube tree under the water deficit environment, and the effects of different deficit irrigation levels at different growth stages vegetative growth and repproductive growth of pear-jujube trees, and also its regulation mechanism.

针对西北半干旱区果业生产面临水资源紧缺的现实，论文以该区特色经济果树梨枣树为研究对象，在西北农林科技大学旱区农业水土工程教育部重点实验室、陕西省大荔县城关镇梨枣园分别开展了温室与大田试验，对调亏灌溉的梨枣树根区土壤水分动态变化特征、水分亏缺与复水环境下梨枣树用水过程、生理调控与气孔响应机理、不同生育期不同水平亏水处理对营养生长与生殖生长的影响及其调控机制等进行了较系统的研究，分析了各生育期不同亏水处理对梨枣耗水规律、产量、品质、作物系数、水分利用效率及经济效益的影响，取得了以下成果：⑴通过亏水处理与复。。。

Typical tree slelction and random sampling were applied for systematic studies on individual variation of gutta-percha content in samaras of Eucommia ulmoides and the correlations between the characters of samara containing gutta-percha and several macroscopic properties.

采用选择典型样株和随机取样的方法，对杜仲果实含胶特性的个体变异规律及其与若干宏观性状的相关性进行了系统研究。

This paper studies the assessment of EPSS systematic, and introduces the current information performance evaluation in various ways, especially analyzes the application of decision tree technology in the evaluation of education. Finally, the article discussed the background and circumstances of revise of EPSS evaluation rubrics, and hopes to do some contribution to the continuous development of EPSS assessment system.

本文主要研究了EPSS系统的评价部分，介绍了目前信息化绩效评价中各种方法，重点分析了决策树技术在教育评价中的应用，最后文章讨论了EPSS评价量规修订的背景和情况，希望能对EPSS评价系统的不断发展有所贡献。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失