年轮生长的功率谱测定检出，大青杨年轮生长存在2.5、3.2、6.3年的周期，年轮生长的周期性主要是受气象因子影响所致。
The measurement of power spectra of growth ring demonstrates the variations of period every 2.5, 3.2, 6.3 year under the influence of climatic factor.
爬行动物的骨骼生长在本质上是周期性的，在骨头上产生一系列的同心圆，就像树木的年轮一样。
Bone growth in reptiles is periodic in nature, producing a series of concentric rings in the bone, not unlike the growth rings of a tree.
在地球上，人们认为，表明太阳黑子周期最可靠的迹象之一是树木的生长速度，就像树干横截面上可见的年轮一样。
On Earth, among the surest indications of sunspot cycles are believed to be the rate that trees grow, as seen in the rings visible in the cross sections of their trunks.
由于骨骼不会在动物冬眠时生长，因此年轮缺失的现象使他们得出了原始的理论。
Since bones don't grow when an animal hibernates, the absence of rings led them to their original theory.
同树木一样，石笋通常也有能显示其年生长周期的年轮。
Like trees, stalagmites are often composed of concentric layers that represent annual growth periods.
至于1500年以前的资料，两位研究人员则利用了从他人论文中挑选出的间接数据，如：冰核、年轮、以及珊瑚的生长方式。
For earlier years, the two researchers relied on indirect data such as ice cores, tree rings and the growth patterns of corals that they culled from other people's papers.
但是年轮很小，表明那些树木的生长是极其缓慢的。
But the rings were very small, showing that the trees grew extremely slowly.
为了得出每年的气温值，他们对生长在高海拔地区的针叶树的年轮进行测量，这种树木在炎烈的夏天生长得比较快，而在寒冷的年份就长得比较慢。
To get annual temperatures, they measured rings in high-altitude conifer trees, which grow faster in warmer summers and slower in colder years.
解剖树木生长过程木材密度变化规律，研究年轮内密度的变化十分重要。
So it is very important to find out the variation regulation of wood ring density in growth process.
通过对渭北黄土高原刺槐人工林最大林木的树干解析和年轮分析描述了林分最大两株林木的树高、直径和材积生长过程。
Growth process of height, diameter and volume of the largest two stems of some sampled black locust stands on Weibei-loess plateau were described by analyzing stem disks and growth rings.
东北桦呈黄褐色，生长年轮略明显，木材有光泽，纹理直，结构细而均匀，但硬度稍差。
Northeastbirch is tawny, growth ring slightly obvious. Shiny wood, straighttexture, fine structure and uniformity, poor hardness.
外观：散孔材，半环孔材倾向明显，生长年轮略明显，心材红褐至紫红褐色，木屑水浸出液红色；
Appearance: diffuse-porous wood, half ring hole material tendency obvious, growth ring slightly obviously, heartwood red brown to purple brown, sawdust water extract of red;
在典型的取样环境中，树木生长多遵循缓慢递减的规律，作生长量订正时，可采用传统的树木年轮学订正方法。
At the typical environment, the tree growth may basically follow the regulation of progressive decrease with the increased age .
树木呈现同心圆的年轮线，而在天然刚玉晶体中这些生长线是角状的，它们都会有一个形成的中心点。
In trees, these lines are concentric, while in natural crystals, they are angular, but both form from a central point.
树木呈现同心圆的年轮线，而在天然刚玉晶体中这些生长线是角状的，它们都会有一个形成的中心点。
In trees, these lines are concentric, while in natural crystals, they are angular, but both form from a central point.
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