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Thunbergii trees were established, and the sun survivorship curves were drawn with field data. The results showed that in the three plots, the height and basal diameter growth of regenerated young P. thunbergii trees had exponential, linear, and quadratic functional relations with age and the age structure was of spindle, discrete, and pyramid types, respectively. Most of the regenerated young trees were distrbuted at 0.3-1.2 m from their nearest standing trees, and the individuals of the young trees decreased near to or far from the nearest standing trees. Inplots Ⅰ and Ⅲ, the expected average life of regenerated young P. thunbergii trees had a decreasing trend with their increasing age, and the survival number of the population also decreased with increasing population age. The survivorship craves of regenerated young P. thunbergii trees in the two plots approximated to the type of Deevey Ⅱ, indicating that the young P. thunbergii populations in the plots were at stable development stage. The population structure of regenerated young P. thunbergii trees in plot Ⅱ was lesser integral, suggesting that the population was of declining types being related to human disturbance, slope and other environmental factors.

结果表明:(1) 3个样地中幼龄植株高生长、基径生长与年龄均分别呈指数函数、直线和二次函数关系;(2) 3个样地黑松幼龄植株年龄结构存在着明显差异,分别表现为纺锤形、残缺型和金字塔型;(3)幼龄植株主要集中分布在距最近立木0.3~1.2m,离立木越近或越远幼龄植株均逐渐减少;(4)对样地Ⅰ和样地Ⅲ黑松幼龄植株生命表和存活曲线的分析表明,随年龄的增加,黑松幼龄植株生命期望值基本上呈递减趋势,黑松幼龄植株种群存活数也随着年龄的增加而降低;样地Ⅰ和样地Ⅲ黑松幼龄植株种群存活曲线近似于Deevey Ⅱ型,表明2个样地黑松幼龄植株种群处于稳定发展阶段;(5)样地Ⅱ幼龄植株种群结构很不完整,表明该种群属于衰退型,与人为干扰及坡度等有关。

Stamens 6, free or rarely adnate to perianth tube near base; filaments filiform; anthers dorsifixed, introrse, dehiscing longitudinally.

雄蕊6,离生或很少贴生于花被筒的近基部;花丝丝状花药背着,内向,纵向开裂。

Kennedy Airport makes Ross an easy destination for imitational students.

学校离纽约市和约翰肯尼迪机场都极近,对学生来说是一个很方便的目地。

Fruit dehiscent siliques, linear or oblong, terete or rarely slightly latiseptate, sessile; valves papery, with an obscure midvein, torulose; replum rounded; septum complete, membranous, translucent, veinless; style absent or distinct and to 1 mm, cylindric or clavate; stigma capitate, entire.

果开裂长角果,具宽隔膜的线形或长圆形,圆柱状的或很少稍,无梗;裂爿纸质,具一不明显,近念珠状;假隔膜绕行;隔膜完成,膜质,半透明,无脉;称呼无或离生和在1毫米,圆筒状或;柱头头状,全缘。

Fruit dehiscent siliques, linear, oblong, or lanceolate, latiseptate, sessile; valves papery, with a distinct midvein, glabrous or puberulent, torulose; replum rounded, covered by connate valve margin; septum complete, membranous, translucent, veinless; style obsolete, rarely to 0.5 mm; stigma capitate, entire or slightly 2-lobed.

果开裂的长角果,线形,长圆形,或披针形,具宽隔膜,无梗;纸质的裂爿,具一离生中脉,无毛或具微柔毛,近念珠状;假隔膜绕行,被合生的阀门边盖住;隔膜完成,膜质,半透明,无脉;花柱淘汰,很少对0.5毫米;柱头头状,全缘的或稍2裂。

At first he is startled that anyone would be so close as to touch him, but when he sees who it is he musters a smile.

起先,他很吃惊有人会离他这么近以至于撞向他,但是当他看到是谁的时候,他露出了笑容。

Flowers bisexual, arising from axils of bracts, small, often subtended by 1 cupular or rarely 3 nearly free bracteoles.

花两性,生于腋的苞片,小,通常被包着以杯状或很少小苞片3近离生。

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Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来,英国,在此地早期居住的是凯尔特人,已经被征服了三次。

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