A medium-thick shelterbelt can reduce wind velocity by more than 10 percent to a distance of 20 times the tree height on the leeward side and three times the height to the windward.
中等厚度的防风林在背风侧可在20倍于树高的距离而在迎风侧则在3倍于树高的距离上减小风速10%以上。
It reminds me of a colourful depiction of the poetry of willow: jasper makeup into a tree height, ten thousand lop green silk sash.
这让我想起一首描写柳树的诗词：碧玉妆成一树高，万条垂下绿丝绦。
Birds boost tree height up to 33 percent by munching on pesky parasites that can literally suck the life out of the tall-growing plants, a new study shows.
根据一项新研究显示，鸟儿嚼食讨厌的寄生虫，可以促进树木的高度增加达33%，因为寄生虫会把树木的生命力吸食殆尽。
This model contradicts the hydraulic limitation hypothesis on tree height growth.
该模型对树木高生长的水力限制假说提出了置疑。
The relationships among 5 competition index and DBH, tree height and crown length have been established.
选取5种竞争指标，建立人工落叶松林木胸径、树高和冠长与各竞争指标间的相关关系。
Differences on tree height and row space among the patterns results in different sunlight time in space.
由于各配置模式在树高、行距的差异，日照时数在林内的空间分布不尽相同。
These models could be used to generate the standard tables for tree height, dbh, stand density and density control map.
模型可用于编制树高标准表、直径标准表、密度标准表以及密度控制图等。
The significant differences also existed in wood basic density, fiber length and fiber diameter at different tree height.
不同树干高度处的平均木材密度、纤维长度和纤维宽度存在显著差异。
The analysis of yield and quality of crops indicated that the sheltering range of shelterbelt net was 25 times tree height.
作物产量和质量分析表明，林网的防护范围为25倍树高。
Crown distribution diagram of the community. The crown depths were the difference between tree height and height of lowest leaves.
群落的树冠分布图树冠深度为树高与叶下高的差值。
Repameterizing the average tree height growth model improved the fitting results a lot by introducing site index and density index variables.
引入地位指数和密度指数可大幅提高林龄单因变量平均高生长模型的拟合度。
Factors involved in the model are tree height, DBH, bark thickness at breast height, height of first dead branch, and height of blackened trunk.
判别因子包括个体的树高、胸径、胸高处皮厚、第一枯枝高和树干熏黑高度。
Compared the evaluated height with the true tree height, the errors were within 0.7% to 4.4%, and consequently the errors of volume between 2.1% and 4.7%.
与实际树高相比，重建树高中最大误差是4.4%，最小误差为0.7%，在此基础上计算的材积最大、最小误差分别是4.7%和2.1%。
The correlation between frequency variations of enzyme bands and tree height, DBH and volume was very small. Only B45 band came up to or closed significant level.
酶带频率变异与树高、胸径、材积生长相关性很小，只有B _(45)酶带与生长相关达到或近于显著水平。
Factors involved in the model are: tree height. diameter at breast height. bark thickness at breast height. height of first dead branch and height of blackened trunk.
判别因子分别是：个体的树高、胸径、胸高处皮厚、第一枯枝高和树干熏黑高度。
The genetic gains of superior families selected by progeny tests on early tree height, diameter breast-high and volume growth were 8.24%, 14.33% and 24.16% respectively.
通过子代测定选出的优良家系，其有性后代在树高、胸径和材积早期生长的遗传增益分别为8.24%，14.33%和24.16%。
The results showed that with pear genus dwarf stocks, the most combinations' trunk diameter is thinner, tree height is lower, growth shoots length is shorter, but crown diameter is bigger.
结果表明，梨属矮化砧木做中间砧，多数组合表现出树体干径细，高度低，发育枝短，但冠径较大。
Parabolic curve function, power function, Richards equation and single molecular equation, related tree height to diameter at breast height and widely used in forest gap model, were analysed.
为了更准确地描述树高与直径的关系，文章综合分析了广泛应用于林窗模型中的四个数学方程，即二次曲线、幂函数方程、理查德方程和单分子方程。
Result showed that different waterlogging depths have obvious effects on tree height, diameter at breast height, under branch height, trunk morphological structure, stem base form, and growth process.
结果表明：不同水分条件对池杉的树高、胸径、枝下高、干形、树干基部形态及生长过程均产生明显的影响。
Result showed that different waterlogging depths have obvious effects on tree height, diameter at breast height, under branch height, trunk morphological structure, stem base form, and growth process.
结果表明：不同水分条件对池杉的树高、胸径、枝下高、干形、树干基部形态及生长过程均产生明显的影响。
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