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sand burial
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  沙埋
     There were no significant difference in the emergence of Calligonum mongolicum at all sand burial depths,however,it is only 4% at the depth of 8cm. So the optimal burial depth is observed 5cm.
     泡泡刺、花棒和白刺种子的最佳深埋深度为0~3cm; 沙拐枣在0~8cm各个深度都有出苗现象,且出苗率没有显著差异,但8cm深度的出苗率只有4%,最佳沙埋深度约为5cm。
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     The results showed that slight sand burial could accelerate ramet growth and enhance their leaf biomass, stem biomass and shoot biomass.
     结果表明:轻微程度的沙埋(例如沙埋深度是原始羊柴分株高的10%~20%)可以加速羊柴分株的高生长,提高叶片生物量、茎生物量以及整个地上部分的生物量。
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     The seedlings in both 33% and 67% sand burial treatments did not significantly change their biomass allocation pattern comparing with the unburied ones.
     与非沙埋的对照相比 ,羊柴幼苗在 33%和 6 7%沙埋条件下并不显著地改变其生物量分配格局 ;
短句来源
     sphaerocephala and A. ordosica was 0.5, 1, 0.5, and 0.5 cm, respectively. As the sand burial depth increased, the percentage and rate of seedling e-mergence decreased and the emergence time was delayed, but the percentage of seedlings that did not emerge was not affected.
     4种植物最适宜的供水量均为123 ml,羊 柴、柠条、籽蒿和油蒿的最适沙埋深度分别为:0.5、1.0、0.5和0.5 cm。
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     2 the effects of sand burial on seedling development of Caragana intermedia;
     2沙埋对中间锦鸡儿幼苗生长发育的影响;
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  “sand burial”译为未确定词的双语例句
     Application of hollow rod sand washing in sand burial accident
     空心抽油杆冲砂在处理砂埋事故中的应用
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     In accordance with downhole tubing sticking by sand burial accident, this paper proposes hollow rod sand washing after analysis of downhole string structure and hydraulic calculation of sand grain.
     针对处理井下油管砂埋遇卡事故作业中出现的技术问题 ,在分析井下管柱结构及砂粒的水力计算的基础上 ,提出了空心抽油杆冲砂工艺处理措施。
短句来源
     The results showed that: During the four weeks,there was no seedling decease in T_C,T_1 and T_2,but 20% seedlings died in T_3.Sand burial had significant effects on biomass accumulation,root/shoot(R/S) ratio,root mass ratio and stem mass ratio of seedlings. Root/shoot(R/S) ratio and root mass ratio decreased with the increasing of depth of burial.
     结果表明:TC、T1和T2没有幼苗死亡,T3有20%的幼苗死亡;
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  相似匹配句对
     On Sand
     论砂
短句来源
     Sand burial was favorable to production of new branches.
     一定程度的沙埋有利于砂生槐新枝生长。
短句来源
     Submarine Cable Burial in Sand Wave Areas
     沙波区海底电缆的埋设
短句来源
     Sand and Stone
     沙与石(英文)
短句来源
     The Problems of Burial Ground
     节约方寸地,留与子孙耕——墓地占地现象及其对策研究
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  sand burial
Greenhouse experiments were conducted to determine the effects of sand burial on survival and growth of seedlings ofCirsium pitcheri.
      
Sand burial more than 1?cm was lethal for seedlings.
      
A greenhouse experiment was conducted to test the effects of sand burial depth and seed mass on seedling emergence and growth of Nitraria sphaerocarpa.
      
Effects of sand burial depth and seed mass on seedling emergence and growth of Nitraria sphaerocarpa
      
A greenhouse study was conducted to determine the effects of sand burial on seed germination and seedling emergence of Cirsium pitcheri, a threatened species along Lake Huron sand dunes.
      
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The reproductive characteristics and the arenaceous adaptability of Sophora moorcroftiana as well as its roles in sandy land vegetation succession in middle and lower reaches of Yaluzangbu River in Tibet were analyzed.The results show that Sophora moorcroftiana was one of the dominant constructive species in the area,and its optimal habitats were terrace covered with sand,semistable dunes and initial stage of fixed sand dunes.Sand burial was favorable to production of new branches.Throughout...

The reproductive characteristics and the arenaceous adaptability of Sophora moorcroftiana as well as its roles in sandy land vegetation succession in middle and lower reaches of Yaluzangbu River in Tibet were analyzed.The results show that Sophora moorcroftiana was one of the dominant constructive species in the area,and its optimal habitats were terrace covered with sand,semistable dunes and initial stage of fixed sand dunes.Sand burial was favorable to production of new branches.Throughout the duration of succession beginning with mobile dune,Sophora moorcroftiana invaded and developed in mobile dune by seed reproduction firstly,then became rampant by root turion and finally declined owing to interspecific competition.

本文通过对西藏雅鲁藏布江中游下段沿江沙地主要建群植物砂生槐在沙地上繁殖特征、沙埋对其新枝生长的影响及在沙地植被演替中的地位的分析指出:砂生槐是通过种子的迁移侵入、定居于沙地,通过根蘖在沙地上繁殖,最后退化于种间竞争。一定程度的沙埋有利于砂生槐新枝生长。砂生槐在本区的最适生境是受风沙活动影响较大的覆沙阶地、半固定沙地和初期固定沙地。

Sophora moorcroftiana, an endemic shrub in Tibet, colonizes the terraces, lower slopes and sand dunes in the middle reach of the Yarlung Zangbo River. The soil seed bank characteristics of Sophora moorcroftiana in the middle reach of the Yarlung Zangbo River were discussed in this paper. The objectives are (1) to reveal the variations of soil seed banks among different regions, different plots and different sub-plots; (2) to determine the influences of wind force,floodwater, gravity and cutting on seed...

Sophora moorcroftiana, an endemic shrub in Tibet, colonizes the terraces, lower slopes and sand dunes in the middle reach of the Yarlung Zangbo River. The soil seed bank characteristics of Sophora moorcroftiana in the middle reach of the Yarlung Zangbo River were discussed in this paper. The objectives are (1) to reveal the variations of soil seed banks among different regions, different plots and different sub-plots; (2) to determine the influences of wind force,floodwater, gravity and cutting on seed dispersal, seed distribution and soil seed bank density. The sampling sites in different regions for soil seed bank measurements located on terraces with out sand burial and cutting in Nangxian, Gyaca, Zhanang, Qüxü, Xigaze and Xaitongmin. Sampling sites were selected after a careful survey on land surface features at Gyangdang, which locates in the wide Xigaze valley of the Yarlung Zangbo River. In these sampling sites, one plot without disturbances of wind, flooding and gravity, one plot with only disturbance of wind, one plot with only disturbance of flooding and one plot with only disturbance of gravity were set up. Then each plot was subdivided into many 20cm×20cm sub-plots used for soil seed bank measurement. At Gyangdang, populations of Sophora moorcroftiana, free from sand burial but subjected to cutting, were selected to investigate the soil seed bank density. The analysis showed that: (1) the mean density of soil seed bank of Sophora moorcroftiana populations in the middle reach of the Yarlung Zangbo River ranged from 6.8 to 25.2 grain/m 2 ;(2) differences in seed bank densities existed between different regions with an interval bigger than 100km, different plots with an interval bigger than 100m, and different continuously arranged 20cm×20cm plots. The difference between different regions was about 4 times, and that between different plots 3 times. The difference between the 20cm×20cm sub-plots was evident. Of the 900 sub-plots, the plots with seed density of 0 grains/m 2 , 25 grains/m 2, 50 grains/m 2, 75 grains/m 2 , 100 grains/m 2 and more than 125 grains/m 2, accounted for 63%, 26%, 8%, 2%, 1%, less than 1% of the total, respectively. Calculation of the components of variation, however, showed that, despite significant hetergeneity at these larger scales,most variation (>70%)in seed density was associated with the smallest spatial scale of sampling, between replicate core samples in each plot. Variability among sampling plots and among areas contributed around 3% and 21% of the variation, respectively. Considering the vertical distribution, 70% of the total seeds distributed on the surface, 17.9% in the layer of 0~2 cm, and 1.9% in the layer of 2~5 cm. If not disturbed by wind, gravity and water flow, 85% of the total 20 cm×20 cm sub-plots had seed. Seed dispersal distance by wind was about 6m and that by gravity about 10m. The dispersal distance by water flow was different and closely related to the landforms and the carrying capacity of flowing water. Seeds carried away by gravity or wind might be carried away again by water, thus there was a secondary dispersal of seeds in the research area. In the natural population, the density of soil seed bank reached at its peak at the age of 8 years and then declined with the age. Improper cutting of wood-fuel reduced the production of seed, and as a result, reduced the density of seed bank too. Well-regulated cutting, such as rotation, should be promoted in order to maintain the stability of seed bank. The rotation period was around 8 years.

对西藏特有豆科灌木砂生槐种子库特征研究表明 :雅鲁藏布江中游河谷阶地天然砂生槐种群种子库平均密度变化于 6 .8~ 2 5 .2粒 /m2 。相距 1 0 0 km以上的地区、相隔 1 0 0 m以上的样地以及 2 0 cm× 2 0 cm的连续小样方间种子库密度均存在显著差异 ,不同地区的种子库密度的变异 4倍左右 ,而样地间的变异 3倍左右 ,但样地内小样方间的变异则更大 ,在调查的 90 0个小样方中 ,种子库密度为 0、2 5、5 0、75、1 0 0粒 /m2 分别占 6 3%、2 6 %、8%、2 %、1 % ,种子库密度大于 1 2 5粒 /m2 不足 1 %。地区、样地和小样方尺度上的方差分别为总方差的 3% ,2 1 .2 %和 75 .8%。种子库中种子主要集中在地表 ,占 70 %左右 ,0~ 2 cm土层占 1 7.9% ,2~ 5 cm占 1 1 .9% ,5 cm以下基本没有种子存在。在地形较平坦的相对封闭的丘间低地 ,风力、流水和重力对种群的干扰相对较轻 ,可以近似地视为无干扰生境。在这种生境砂生槐种群发育较好 ,以 2 0 cm× 2 0 cm的小样方为单元 ,85 %的小样方...

对西藏特有豆科灌木砂生槐种子库特征研究表明 :雅鲁藏布江中游河谷阶地天然砂生槐种群种子库平均密度变化于 6 .8~ 2 5 .2粒 /m2 。相距 1 0 0 km以上的地区、相隔 1 0 0 m以上的样地以及 2 0 cm× 2 0 cm的连续小样方间种子库密度均存在显著差异 ,不同地区的种子库密度的变异 4倍左右 ,而样地间的变异 3倍左右 ,但样地内小样方间的变异则更大 ,在调查的 90 0个小样方中 ,种子库密度为 0、2 5、5 0、75、1 0 0粒 /m2 分别占 6 3%、2 6 %、8%、2 %、1 % ,种子库密度大于 1 2 5粒 /m2 不足 1 %。地区、样地和小样方尺度上的方差分别为总方差的 3% ,2 1 .2 %和 75 .8%。种子库中种子主要集中在地表 ,占 70 %左右 ,0~ 2 cm土层占 1 7.9% ,2~ 5 cm占 1 1 .9% ,5 cm以下基本没有种子存在。在地形较平坦的相对封闭的丘间低地 ,风力、流水和重力对种群的干扰相对较轻 ,可以近似地视为无干扰生境。在这种生境砂生槐种群发育较好 ,以 2 0 cm× 2 0 cm的小样方为单元 ,85 %的小样方都有种子分布。风、流水和重力都不同程度地搬运砂生槐种子 ,其中风力搬运的距离一般在 6 m左右 ,重力搬运的距离一般在 1 0 m左右。流水搬运的距离因地形、水流强度而变化较大。风力和重力搬运的距离虽然相对较短 ,但为流水的搬运?

Hedysarum laeve Maxim. (Leguminosae) is one of the major species used frequently in revegetation of dune_field in the sandlands of the northern part of China by means of aerial sowing. Seedlings of the species after emergence above the sand surface may be buried in sand to various depths during its establishment in late spring and early summer. A study was made to examine the effects of sand burial at different levels of 0 (control), 33%, 67%, 100% and 133% of their shoot height, on the survivorship, growth,...

Hedysarum laeve Maxim. (Leguminosae) is one of the major species used frequently in revegetation of dune_field in the sandlands of the northern part of China by means of aerial sowing. Seedlings of the species after emergence above the sand surface may be buried in sand to various depths during its establishment in late spring and early summer. A study was made to examine the effects of sand burial at different levels of 0 (control), 33%, 67%, 100% and 133% of their shoot height, on the survivorship, growth, and biomass allocation pattern of H. laeve seedlings (one and two weeks old after emergence). When burial depth was up to 100% of their shoot height, about 70% seedlings died; and the burial at depth of 133% of their shoot height led to death of all seedlings. When seedlings was buried at depth of 33% and 67% of their shoot height, respectively, after six_week growth, their biomass of whole plant, blade, and root and relative growth rate were higher than the unburied counterparts. The seedlings in both 33% and 67% sand burial treatments did not significantly change their biomass allocation pattern comparing with the unburied ones. Furthermore, the number of leaves and shoot height of the seedlings in both 33% and 67% sand burial treatments were not significantly different from those of unburied individuals, respectively. The newly born leaves of the surviving seedlings, in 33%, 67%, and 100% burial treatments, during the period of experiment, were significantly more than those in control.

羊柴 (HedysarumlaeveMaxim .)是中国北方沙地飞播进行植被恢复与重建的主要植物种。在晚春与夏初的出苗期 ,羊柴幼苗经常遭受不同深度的沙埋。研究旨在探明沙埋对羊柴幼苗存活、生长和生物量分配格局的影响。6周的沙埋试验结果显示 :当沙埋深度达到其株高时 ,约有 70 %的幼苗死亡 ;沙埋深度达到其株高的 133%时 ,可使羊柴幼苗全部死亡 ;沙埋深度分别为株高的 33%和 6 7%时 ,羊柴幼苗的整株生物量、叶片生物量、根系生物量以及相对生长率都相应地高于非沙埋的对照 (即 :0 %沙埋 )。与非沙埋的对照相比 ,羊柴幼苗在 33%和 6 7%沙埋条件下并不显著地改变其生物量分配格局 ;并且羊柴幼苗的叶数和株高与对照无明显差异 ,但试验期内的新生叶数是沙埋处理 (即 :33%、6 7%和 10 0 %沙埋 )的幼苗明显地高于非沙埋的对照。

 
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