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canopy gap
相关语句
  林窗
    The spatial characteristics of air temperature in canopy gap in a tropic secondary forest in Xishuangbanna
    西双版纳干季晴天次生林林窗气温时空分布特征
短句来源
    Temperature measurements at the canopy gap of a secondary forest were conducted in Xishuangbanna,Yunnan in dry season.
    利用西双版纳干季 ( 1 2月、4月 )次生林林窗的温度观测资料 ,探讨了睛天林窗 4方位的气温的空气变化特征。
短句来源
    The results supplied a basis in further studying canopy gap microclimate and the relevant ecological phenomena.
    其结果可为进一步研究森林林窗小气候及有关生态学现象提供基础。
短句来源
    Latest studies show that seed rain,seed bank,seedling bank and clone growth are necessary for community regeneration and canopy gap is the primary way for it.
    近年的研究表明,种子雨、种子库、幼苗库和克隆生长是群落实现更新的重要条件,林窗更新是顶极群落结构维持的主要方式.
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  canopy gap
Seeds under unfiltered light, which simulated the light conditions of seeds on the soil surface in a canopy gap, germinated at a constant temperature of 20°C.
      
Contrasted Responses of Two Understorey Species to Direct and Indirect Effects of a Canopy Gap
      
There were many indicator species for high understorey light levels and canopy gap centres, but none for medium or low light or closed canopy.
      
Four attributes were included in the PCA: final germination percentage in canopy gap, germination rate in the laboratory, and gap-and chilling-dependency indices (EGAP and STRAT, respectively).
      
Final percent germination was significantly enhanced under canopy gap conditions in 19 species, and significantly reduced in 11 species.
      
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Based on plot investigation, stem analysis and radial growth pattern, the authors studied the history of suppression, release and regeneration strategies of Fagus engleriana Seem. and Quercus aliena var. acuteserrata Maxim. forests, which were widely distributed in Shennongjia of Hubei Province. It was found that (85.9±6.9)% of the Fagus engleriana samples showed periods of suppression during their canopy recruitment. The average number of suppression periods was 2.1±0.8, the average total...

Based on plot investigation, stem analysis and radial growth pattern, the authors studied the history of suppression, release and regeneration strategies of Fagus engleriana Seem. and Quercus aliena var. acuteserrata Maxim. forests, which were widely distributed in Shennongjia of Hubei Province. It was found that (85.9±6.9)% of the Fagus engleriana samples showed periods of suppression during their canopy recruitment. The average number of suppression periods was 2.1±0.8, the average total length of suppression time was (47±24.1) a, the length of longest suppression time was 73 a, the average number of periods of release was 1.6±0.7, and the average total length of release time was 23 a. (60.83±17.3)% of the Quercus aliena var. acuteserrata samples showed periods of suppression but without release. Combined with height and radial growth characteristics, these suggest that Fagus engleriana was shade_tolerant species, and its regeneration strategies was release from seedling sprouts in canopy gaps, while Quercus aliena var. acuteserrata was shade_intolerant species, and its regeneration strategies was seedling establishment and growth in large canopy gaps by producing large amount of seeds.

通过样地调查、树干解析及直径分析法,对神农架地区广泛分布的米心水青冈( Fagusengleriana Seem .) 林和锐齿槲栎( Quercus aliena var. acuteserrata Maxim .) 林受压和释压历史及更新策略进行了研究。结果表明:米心水青冈直径生长表现为5 种模式,而锐齿槲栎只表现为2 种模式。(85.9±6.9)% 的米心水青冈有过受压过程,平均受压2 .1±0 .8 次,平均受压时间为(47 ±24.1) a,最长受压时间73 a,平均释压次数为1 .6 ±0 .7 次,平均释压时间为(23 ±21.5) a,而60.83% 的锐齿槲栎都均有1 次受压,平均受压时间为(19 ±14) a,受压后没有表现出释压过程。结合高生长和径向生长,认为米心水青冈是耐荫树种,它的更新策略主要是在林下形成苗性萌枝,在有林窗形成时释压生长进入乔木层;而锐齿槲栎是不耐荫树种,其更新策略主要是通过产生大量种子,当有大的林窗时,幼苗在林窗内生长逐步进入乔木层

Temperature measurements at the canopy gap of a secondary forest were conducted in Xishuangbanna,Yunnan in dry season.The results showed that there was a significantly thermal effect at the gap,and the maximum air temperature and the diurnal range of air temperature in the gap was quite different.The extreme value was on the east edge of gap,and it may be a reason to form the special microclimate in the gap.The results supplied a basis in further studying canopy gap microclimate...

Temperature measurements at the canopy gap of a secondary forest were conducted in Xishuangbanna,Yunnan in dry season.The results showed that there was a significantly thermal effect at the gap,and the maximum air temperature and the diurnal range of air temperature in the gap was quite different.The extreme value was on the east edge of gap,and it may be a reason to form the special microclimate in the gap.The results supplied a basis in further studying canopy gap microclimate and the relevant ecological phenomena.

利用西双版纳干季 ( 1 2月、4月 )次生林林窗的温度观测资料 ,探讨了睛天林窗 4方位的气温的空气变化特征。由于林窗的不同位置所受太阳辐射的影响不同 ,加之林缘热力效应的综合作用 ,林窗中存在明显的气温差异 ,特别是最高气温差异显著 ;气温最高值和气温日较差最大值不在林窗中央而出现在林窗东侧林缘树冠垂线外。这势必造成林窗不同区域热量传输的不同 ,形成林窗小气候的差异。其结果可为进一步研究森林林窗小气候及有关生态学现象提供基础。

In Dongling Mountain region,the fates of the buds of Quercus liaotungensis were investigated using randomized branch sampling method,and their relationship to shoot length,the number of leaves and the number of fruits were statistically analyzed.The results are as follows:(1) the buds of Q.liaotungensis might remain dormant,or abscise after death,or differentiate to be vegetative shoots and generative shoots;(2)the fates of buds varied with habitats,i.e.,the proportion of the buds producing generative...

In Dongling Mountain region,the fates of the buds of Quercus liaotungensis were investigated using randomized branch sampling method,and their relationship to shoot length,the number of leaves and the number of fruits were statistically analyzed.The results are as follows:(1) the buds of Q.liaotungensis might remain dormant,or abscise after death,or differentiate to be vegetative shoots and generative shoots;(2)the fates of buds varied with habitats,i.e.,the proportion of the buds producing generative shoots of the saplings growing in canopy gap was significantly higher than that of the saplings growing in closed canopy,and approximated to that of the mature trees in the closed canopy;(3)the fates of buds were affected by other factors,e.g., the buds on upper shoots and on long shoots with more leaves had larger probability to produce generative shoots than the counterparts.It was also found that the shoots bearing no fruits were shorter than the shoots bearing fruits,on which the number of leaves was bigger.

植物体是一个构件集合体 ,植物的枝系伸展可由芽库出生率、死亡率的统计学过程来分析。在东灵山地区 ,应用随机枝取样法调查了辽东栎芽的命运 ,并对其与枝长、叶数、果数等的关系进行了统计分析。结果表明 :( 1 )辽东栎的芽或保持休眠状态 ,或死亡后脱落 ,或分化为营养枝、生殖枝 (包括雄花枝、雄花序、雌花枝和两花枝 )等 ;( 2 )不同生境中芽的命运不同 ,生活在林窗中的幼树上的芽分化为具有生殖功能的枝条的比例显著高于郁闭林中的幼树 ,而与成熟个体接近 ;( 3)芽的命运还受其它因子的影响 ,如上层枝条上、或叶数多的长枝上的芽分化为生殖枝的可能性大于其它的芽。另外还发现结实枝的枝长、枝上叶数都明显高于非结实枝。

 
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