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The main environment factors which affect the growth of plants are temperature, humidity, and sunshine etc, but it iswarm at most part of China East area in our country, the warming time is not long in winter, the greenhouse temperature is high in summer and the highest room temperature is often upper than 40℃, so 2/3 of the year we can not plant in greenhouse, which dilapidates the greenhouse over long time.

影响植物生长发育的主要环境参数有温度、湿度、光照等,但是我国华东大部分地区气候温暖,冬季温室加温时间不长,夏季温室室温高,最高室温常在40℃以上,植物无法生长,一年有三分之二时间不能栽培作物,造成温室长期间荒废。

SHK-6 treatment significantly decreased podding height, efficiently inhibited the development of 3-4 internodes and promoted upper internodes growth.

SHK-6可以通过塑造株型,改善叶片和根系生理功能,实现产量和品质的协同改善。

The results showed that Liquidamba formosana, Quercus acutissima, and Quercus fabri populations had the dominant positions in the forest community of Purple Mountain Area of Nanjing. During the growth process, the mortality of L. formosana, Q. acutissima, and Q. fabri were higher in low age. After entering into the middle-age stage, the upper space was occupied by oak and L. formosana population all died. The mortality of Q. acutissima and Q. fabri populations were increased with the increasing of diameter class. L. formosana population in the Purple Mountain Area of Nanjing belonged to be the typical growing population and Q. acutissima population was a decreasing population. Q. fabri population belonged to be the growing population on the whole, but the diameter class in middle parts was incomplete and the population was difficult to be renewed. Among the studied quadrate, only one dominant population showed an aggregated distribution and other dominant species showed the random distribution. Either, all the dominant species in all the quadrates presented random distribution.

结果表明,枫香种群、麻栎种群和白栎种群在南京紫金山地区森林群落中占有优势地位;枫香种群、麻栎种群和白栎种群在其生长过程中,在低龄时期,死亡率都较高,进入中龄期后,由于上层空间都被栎木占据,枫香种群全部死亡,而麻栎种群和白栎种群的死亡率则随着径级的增大而增大;南京紫金山地区枫香种群属于典型的增长型种群,麻栎种群属于衰退型种群,白栎种群总体上属于增长型群落,但中间径级不完整,种群更新较为困难;在所研究的每一个样方中,一般只有一个优势物种呈聚集分布,而其他优势物种呈随机分布,或样方中所有优势物种都呈随机分布。

PAL activity increased more highly in resistant variety or at earlier growth stage or upper sheathes.

这一结果表明,玉米对纹枯病的阶段抗性变化以及品种抗性与PAL活性变化可能存在正相关。

The results show that, under each drip irrigation treatment before the tasselling stage of spring maize, the fluctuation of average soil water content and soil matric potential at different soil depthes are comparative low under high frequency drip irrigation treatment, and the HDI can hold stable soil water content. The drip irrigation can obviously delay the effect of air temperature on the soil temperature, which was influenced by irrigation process, soil water content and crop growth stages. In addition, the irrigation frequency affects the spring maize root distribution in the soil, and the HDI improves the probability of root distribution in upper soil(0~40 cm). The yield difference of spring maize for irrigation frequency treatments is not significant under the typical field irrigation model combined irrigation with precipitation.

试验结果表明:在春玉米抽雄期以前阶段实施的滴灌各处理中,高频滴灌下土壤平均含水率和不同深度处的土壤基质势波动幅度较小,高频滴灌下土壤水分能保持在一个比较稳定的范围;土壤温度受灌水过程、土壤含水率及作物生育阶段的影响较明显,滴灌能显著延迟气温对土壤温度的影响;灌水频率对春玉米根系分布存在一定影响,高频灌溉能显著促进春玉米根系在上层土壤(0~40 cm)中的分布;此外,在这种典型的灌溉和降雨相结合灌溉模式下,不同灌水频率下玉米产量差异不显著。

With the growth progress, the P and pro in all tested leaves gradually decreased. The dynamic changes of Chl in leaves showed different patterns, with little changes at different assaying points in the lower leaf and a single peak curve in the ear leaf and upper leaf.

植株不同叶位P和Pro随生长进程均不断下降;不同叶位Chl的变化动态表现为下位叶在各测定时期之间差异较小、穗位叶和上位叶为单峰曲线。

Due to the fast growth of domestic economy, the power demand has been continuously increasing, So that, the capacity of Taiwan Power Company existing 69 kV power supply system has not be sufficient to meet current demand, TPC is forced to upgrade the distribution power system to the upper level of 161 kV system completely for higher capacity of feeder cable and higher quality of power supply.

摘要 由於国内经济快速成长,对电力的需求不断增加,台电原有的69 kV供电设施已不敷使用,必须全面改用161 kV供电系统俾扩大馈线供电容量及供电品质;且因为对都市景观、电力品质及供电的稳定性等要求,架空输电线路地下化乃成为未来供电业亟待解决之课题。

From the research result mentioned above, it was concluded that the selection of excellent single shoot tissue culture seedlings was an effective approach to guarantee fast growth and high yield of rattan plantation; the application of advance planting technique, such as controlling planting time, seedling number per group and spacing was very important for the purpose of minimizing unfavorable effect of rattan planting on upper trees, increasing cane yield and improving the level of economic gain; the determination of optimal harvest regime by adjusting the first harvest time, the lower limit of stem length for cutting as well as the harvest interval offered technical support to utilize resources reasonably and sufficiently and to enhance the economic benefit dramatically.

综合分析,通过组培快繁技术选择优质组培单芽藤是保证藤林速生丰产的有效途径;根据藤种的生物学特性,选择适宜的林地和上层林分,采取调控种植时间、丛栽株数和株行距等造林措施是减少棕榈藤间种对上层树种不利影响、有效增加原藤产量和提高林地增益水平的关键措施;而通过控制初始采收龄、起采茎长和采收间隔期,确定藤林最佳采收方式是促进资源充分利用、提高藤林的经济效益的有力保障。

This portion of the follicle is permanent; the portion of the follicle between the bulb and the upper limit of the inner root sheath is completely replaced at each new cycle of hair growth.

这部分毛囊是永久性的;位于毛球和内根鞘末端的毛囊部分在每一个新的毛发周期都会被完全替代。

Gravity wave and ozone are two interesting topics in the middle and upper atmosphere. In this dissertation, they are studied by numerical simulation and instrument development respectively.In section one, by using FICE scheme and TIME-GCM, a model of trace gases and OH airglow affected by gravity wave is set up, then the propagation of nonlinear gravity wave and the effect on trace gases and OH airglow are analyzed. The result shows gravity wave excited by tropospause forcing can propagate stably to the mesosphere through the stratosphere so that energy and momentum can be transferred from one region to another. In this process, gravity wave undergoes growth, overturning, convection and breaking. And the no-isothermal structure can accelerate the breaking of gravity wave in mesospause, and the breaking of gravity wave is an important source of convection and small-scale waves.

中文题名气辉的非线性重力波研究及臭氧总量探测仪的研制副题名外文题名 The study of airglow by nonlinear gravity wave and the development of the total ozone spectrometer 论文作者王咏梅导师刘振兴王英鉴学科专业空间物理学研究领域\研究方向学位级别博士学位授予单位中国科学院空间科学与应用研究中心学位授予日期2003 论文页码总数88页关键词臭氧气辉重力波馆藏号BSLW /2003 /P421 /7 重力波和臭氧是中高层大气中研究的两大热门课题,本文分别从理论模式和仪器研制两方面对它们进行了研究。

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推荐网络例句

The Porsche Owner: But it's my car!

可,这是我的车呀。

LOX_83}{Oh, another bunch of wackos.

{LOX_83}{呃,又一群怪人。

It is difficult to fit a suit on him because he is so irregularly built.

他的体形和常人不大相同,很难有合身的衣服。