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1)  sapling stage
幼树期
1.
The growth performance of sapling stage showed that Pinus contorta could adjusted to the site conditions of the two experimental sites.
幼树期的试验结果表明:扭叶松能适应两地的环境条件,植苗造林成活率及保存率达91。
2)  sapling stage selection
幼树期选择
3)  seedling and sapling
幼苗幼树
1.
In order to clear the relationships between photosynthesis and leaf N,leaf P,SLA of tropical trees and test the differences of relationships among life-form groups(tree,shrub-like tree and shrub),seedling and saplings of 101 species in tropical montane rain forest located in Diaoluo Mountain of Hainan Island were selected.
以海南岛吊罗山热带山地雨林101个物种的幼苗幼树为试验材料,测定其光合、叶片氮、磷含量及比叶面积;检验其相关关系,并按乔木,乔灌木(小乔木至大灌木)和灌木3个生活型组进行分组检验。
4)  Young trees
幼树
1.
Photosynthetic characteristics of young trees leaves of Black berry were studied with a CO_2 infrared analyzer.
采用红外线CO2 气体分析仪对美国黑莓幼树光合特性进行研究 ,结果表明 :黑莓叶片光合速率日变化呈双峰曲线 ,最高峰在 9:0 0 ,次高峰在 13:0 0 ,存在“午休”现象。
2.
Analyse the influnce of shade on young trees growth are very important to the current status of forestation of Guangdong.
光照是影响林木生长的重要因素 ,为分析庇荫对幼树生长的影响 ,选择 6个常用的阔叶树种在不同郁闭度条件下进行造林实验。
5)  young tree
幼树
1.
Based on the observation on young tree growth of Davidia involucrata Baill and planting experiment,plantation techniques were summarized.
根据观察研究结果描述了珙桐幼树的生长特性,结合试验结果总结了珙桐的山地造林技术。
2.
The young trees in the new afforestation land were inter-cropped with peanut and sweet potato to investigate the effects on the growth of young trees.
退耕还林幼林地间作花生、红薯和无间作对幼树的生长发育的影响研究表明,间作花生能较好地促进幼树的生长,对树茎、分枝数和树高的有利影响极为明显,经济效益十分显著。
6)  Saplings [英]['sæpliŋ]  [美]['sæplɪŋ]
幼树
1.
Determination and Analysis of Photosynthetic Characteristics of Grafted Saplings of Magnolia grandiflora;
广玉兰嫁接幼树光合性能的测定与分析
2.
densiflora saplings in the canopy gap were fewer than that.
以延边地区天然赤松林内更新幼树为对象 ,分析幼树的分枝数、分枝概率分布和分枝角的变化动态 ,探讨了赤松幼树的分枝特性及其与微生境的关系。
3.
We researched the basal character of tree crown for broadleaves-Korean pine mixed forest,the sapling distribution under tree crown;We analyzed the spatial patterns of crowns for major species and saplings in understory,also the spatial association between crowns and saplings to interpret the spatial pattern of populations in in broadleaves-Korean pine mixed forest.
本文以小兴安岭典型阔叶红松林大面积固定样地(9hm~2)为对象,调查所有DBH≥2cm个体的树高,并对高度>10m的个体进行冠幅调查,绘制树冠图,得到主要组成树种的树冠斑块图以及每个斑块下幼树的分布情况。
补充资料:欧洲式期权、美国式期权与亚洲式期权


欧洲式期权、美国式期权与亚洲式期权


  【欧洲式期权、美国式期权与亚洲式期权】期权合约所规定的权利有一定的时效期,过了失效日后,权利即行作废。一些期权规定权利仅能在有效期的最后一天执行,这种期权被称为欧洲式期权(ell功pean叩tions);另一些期权则容许在有效期内任何一天执行,这种期权被称为美国式期权(一~oPtions)。值得指出的是,虽名为欧洲式或美国式期权,但已无任何地理上的意义。由于欧洲式期权的规定过于严格,又出现了一种“改变的欧洲式期权”,它允许期权在一定的时间范围内进行交易。可见,美国式期权为期权购买者提供了更多的选择机会,因此,它的购买者也往往需支付更高的保险费。近年来无论在欧洲或美国,所交易的期权均以美国式为主,欧洲式期权虽仍存在,但其交易量已比不上美国式期权。 在so年代末期,市场上又出现了一种所谓亚洲式期权(asian ontions),但也无地理上的意义,其差别主要在于履约价值(exe而sev公此)的计算。以买权为例,无论是美国式期权或是欧洲式期权,执行权利所能得到的履约价值均为当时标的物的市价减去履约价格,再乘以合约所定的数量,但亚洲式期权的履约价值则为权利期间内标的物市价的平均(计算至履约日为止),减去履约价格,再乘以合约所定的数量。
  
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