助手标题  
全文文献 工具书 数字 学术定义 翻译助手 学术趋势 更多
查询帮助
意见反馈
   canopy structure 在 农作物 分类中 的翻译结果: 查询用时:0.01秒
图标索引 在分类学科中查询
所有学科
农作物
林业
生物学
园艺
农艺学
农业基础科学
建筑科学与工程
工业通用技术及设备
自动化技术
更多类别查询

图标索引 历史查询
 

canopy structure     
相关语句
没有找到相关双语例句
例句
为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法,我们为您准备了出自英文原文的大量英语例句,供您参考。
  canopy structure
The results show that small-diameter Korean pines' origination and growth have close relations to the overstory canopy structure dynamics and play an important role in the maintenance and development of Korean pine forest.
      
Canopy structure would influence DTS and DCR across canopy-atmosphere interface remarkably.
      
deltoides, was used to evaluate the genetic basis of canopy structure and function in a clonally replicated plantation.
      
Canopy structure, shoot design, and photosynthetic light recruitment were used to compare four coexisting dwarf shrub species with respect to light utilization.
      
Canopy structure and physiology of paper birch are examined in the field during two growing seasons.
      
更多          


The result of eight years' study indicated that if the wheat cultivar You—bao was to attain a high yield level of 1000—gin Permu on a large scale,the following key points should be observed.1.The increment of yield level per unit area always involvedtwo stages.In the stage from low to high yield,the main side ofcontradiction was the number of ears per mu which was mainlydetermined by soil fertitity.In the stage from high to higher yield,however,the main side of contradiction had shifted to the weightof ear which...

The result of eight years' study indicated that if the wheat cultivar You—bao was to attain a high yield level of 1000—gin Permu on a large scale,the following key points should be observed.1.The increment of yield level per unit area always involvedtwo stages.In the stage from low to high yield,the main side ofcontradiction was the number of ears per mu which was mainlydetermined by soil fertitity.In the stage from high to higher yield,however,the main side of contradiction had shifted to the weightof ear which was essentially determined by the light condition.2.The soil of 1000—gin yield level required proper chemical andphysical properties.The amount of organic matters,total nitrogen,p_2o_5 and k_2o in the cultivated layer should at least reach the levelof 1.2%,0.08%,30 p.p.m.and 200 p.p.m.respectively.Besides,no less than ten thousand gin of good manure and 50 gin ofsuperphosphate should be used as basal dressing and 80 gin ofammonium sulphate as top dressing.3.The building up of a reasonable dynamic canopy structure wasessential to the optimal utilization of space,soil moisture and fertility,and light energy.In order to attain such a dynamic canopy structure,the number of seedlings,number of tillers,number of kernels,weightof kernels and the leaf area index throughout the growing periodshould be controlled within appropriate limits.These limits of coursecould he different in different localities.(a)Increase the weight of ear at the expense of a reasonable reduction of the number of ears per mu.(b)Reduce the number of seedlings per mu so as to ensure goodseedling growth and subsequent development.(c)Control the number of tillers before wintering and promotethe formation of effective tillers.(d)Maintain the dynamic leaf area indices within appropriatelimits.4.Three key points in Scientific culture for high yielding wheatwere observed.(a)A vigorous but not too luxuriant growth ofseedlings before wintering was a prerequisite.(b)Neither top dressingof fertilizers nor irrigation would be recommended in early springwhen the seedlings were turning green.Proper application of ferti—lizers and irrigation should be practiced at the jointing stage.(c)Disease and pest control after the flowering stage with proper irrigationwhenever justified were important measures for improving the kernelweight.

冬小麦蚰包,是亩产稳定800斤,高者可达1100斤以上的优良品种。本文系统总结了蚰包小麦十年创千斤的经验,论证了小麦生产过程中的阶段性、蚰包小麦创千斤的基本条件、群体动态结构及科学管理等问题。

Studies on the production and distribution of dry matter were made during the period from1977 to 1979 in high-yielding populations of single cropped mid-seasoned hybrid rice cultivars.Highyield of 725.4,716.25 and 709.5 kg/mu was obtained respectively by three cultivars,namely,Nan-yuNo.3,Gan-hua No.2,and V20A×Giu630.It was found that the production of dry matter is closelyrelated to the grain yield of these hybrids;the increase of grain yield depends upon the increase ofthe total amount of dry matter produced.Heterosis...

Studies on the production and distribution of dry matter were made during the period from1977 to 1979 in high-yielding populations of single cropped mid-seasoned hybrid rice cultivars.Highyield of 725.4,716.25 and 709.5 kg/mu was obtained respectively by three cultivars,namely,Nan-yuNo.3,Gan-hua No.2,and V20A×Giu630.It was found that the production of dry matter is closelyrelated to the grain yield of these hybrids;the increase of grain yield depends upon the increase ofthe total amount of dry matter produced.Heterosis in the production and storage of dry matter wasmanifested in the earlier stages.This heterotic effect is closely related to the total photosynthetic area.Heterosis in net assimilation rate was also observed in the earlier stages,but it disappeared later.Theproduction of dry matter is also related to the canopy structure and the planting season;early trans-planting of seedlings usually brings about high yield.High-yielding plots nsually have a higher coefficient of economic yield(Ke),which is closelyrelated to the cultural conditions.The increase of the dry weight of tillers and that per unit area ofleaves is favourable to the formation of an ideal canopy.In order to increasa the rate of seed-setting.It is necessary to increase the photosynthetic productsalloted to the spikelets at the heading stage.It is important in hlgh-yield culture of hybrid rice to utilize the heterosis of vegetative growthfor better seed-setting and filling of grains,to improve the efficieney of the light-receiving capacityof the popvlations and to maintain better daily increase of dry weight during the later atages.The rate of growth between the different organs and the different growth staoes should also becoordinated.The maximum number of tillers should be kept below 350 thousand per mu,whereas themaximum leaf area index should be manipulated to about 7.5-8.

1977~1979年,作者在杂交稻高产栽培过程中,研究了高产群体的干物质生产与分配。高产田谷粒产量与干物质产量密切相关。水稻生长前期总光合势的迅速增加,导致干物质生产与积累表现优势,净同化率的优势前期明显,后期消失。适期早栽、冠层结构良好,干物质产量较高。改善栽培条件,有利提高经济系数。增加单蘖的干物质和单位叶面积的干重,有利于建成高产群体。杂交稻高产栽培关键在于合理利用营养优势,提高光能利用率、协调器官之间和生育期间的生长。最高茎蘖数不超过35万/亩,最高叶面积指数保持在7.5~8左右为好。

A new mathematical model (PTAA) is proposed for the quantitative description of wheat canopy structure by simply measuring plant height, spike length, peduncle and basal internode, culm diameter, etc.with a microcomputer. This model is considered as a candidate for description of wheat LAI vertical distribution in canopy. The differences of canopy structure and extinction coefficient(K) vertical distribution in canopy among 21 wheat cultivars and different planting density in the same...

A new mathematical model (PTAA) is proposed for the quantitative description of wheat canopy structure by simply measuring plant height, spike length, peduncle and basal internode, culm diameter, etc.with a microcomputer. This model is considered as a candidate for description of wheat LAI vertical distribution in canopy. The differences of canopy structure and extinction coefficient(K) vertical distribution in canopy among 21 wheat cultivars and different planting density in the same cultivat were studied by using this model. The differences of these characters among different cultivars and different planting density in the same cultivat were significant at P 0.01 and P 0.05 level, respectively. The value of broad heritability of K is 76.9%. There is no relationship between K and grain yield, but the influence of vertical distribution of K on grain yield is significant. In the lower Yangtse valley, the centre of gravity of high-yield wheat variety canopies is higher than that of others, and the K of upperlevel is bigger than that of others. It is possible to breed highyield variety according to selection of canopy structure and extinction coefficient vertical distribution, because a simple PTAA needs not destroysamples.

拟定了快速而无需破坏样本的“株型结构分析法”及其计算机程序。调查了小麦冠层结构与消光系数(K值)分布在21个基因型间和同一基因型的不同处理间的差异。对该方法所作的验证表明:采用该法调查结果和分层切片法与Ross法的结果基本一致。此法是可靠的。冠层结构与K值垂直分布在基因型间差异极显著;同一基因型不同密度之间仅达显著程度。K值是比较稳定的遗传性状,广义遗传力为76.9%。总K值对籽粒产量影响不大。由于长江下游地区辐射条件较差,高产群体表现出冠层重心较高,K值分布呈上层大、中层小的特点。说明该地区选育的品种上部叶水平角宜小(倾斜至水平),中部叶宜直立。讨论中提出了以株型结构分析法对K值分布作选样和培育高产品种的可能性。

 
<< 更多相关文摘    
图标索引 相关查询

 


 
CNKI小工具
在英文学术搜索中查有关canopy structure的内容
在知识搜索中查有关canopy structure的内容
在数字搜索中查有关canopy structure的内容
在概念知识元中查有关canopy structure的内容
在学术趋势中查有关canopy structure的内容
 
 

CNKI主页设CNKI翻译助手为主页 | 收藏CNKI翻译助手 | 广告服务 | 英文学术搜索
版权图标  2008 CNKI-中国知网
京ICP证040431号 互联网出版许可证 新出网证(京)字008号
北京市公安局海淀分局 备案号:110 1081725
版权图标 2008中国知网(cnki) 中国学术期刊(光盘版)电子杂志社