您要查找的是不是：
- Based on investigating the Forest Park and City Park in Yanan, the tree species structure of park green space in Yanan City was analyzed. 摘要在对延安市森林公园和城市公园绿地进行调查的基础上对延安市公园绿地的树种结构进行了分析。
- The tree species structure optimizing result: broadleaved species ascend from 27% to about 50%, needle species decreased, P. Thunbergii area lowed from 62.85% to 33.10%, the integrate proportion of needle and broadleaved species is closed to balance. 树种结构优化决策结果是扩大了阔叶树种比重;由原来的27%25左右上升到50%25左右; 降低了针叶树种比重;黑松树种占的面积由原来的62.;85%25下降到33
- Tree species structure 树种结构
- It's one of the tree species I have just learned to know. 我刚认识的树种。
- China has the world's most ancient tree species -- metasequoia. 中国有世界最古老的树种 --水杉。
- Dormancy Depth of Several North-east China Tree Species. 东北几个树种苗木的休眠深度
- Shanxi allspice tree species of medicinal and spice. 山西香果药用及香料树种。
- Lower slopes of the upper dry rainforest tree species. 为低山坡干性雨林中上层乔木树种。
- We studied changes in floristic composition, community structure and tree species diversity along an altitudinal gradient on Mt.Mang (eastern Nanling Mountains) and Mt. 根据沿海拔梯度设置的样地的调查资料，对南岭东段的莽山和西段的猫儿山植物群落乔木层物种多样性的垂直分布格局进行了比较研究。
- The results showed that the forest community in this area has the features of clear structure,rich tree species,obvious dominant tree species and obvious succesion syndynamics. 结果表明，雾灵山自然保护区的森林群落层次结构明显，种类组成比较丰富，优势种明显，具有明显的动态演替特征。
- The results indicated that the species diversity variation in Castanopsis eyrei community was obvious and the species structure was complicated. 结果表明，甜槠群落物种多样性梯度变化规律明显；
- It is 700 metres in length and introduces 20 tree species along the walk. 树径全长700米,介绍沿途20种树木植物。
- The Comparison of Frozen Resistance of Several Tree Species of Ilex L. 几种冬青属植物抗冻能力比较。
- Pioneer Tree Species for Forestation in Sandy Land--Hippophae rhamnoides L. 沙地造林的先锋树种-沙棘。
- For the majority of tree species this method appears to be very well suited. 对于大多数树种来说，这个方法看来都是适合的。
- Some other applications of ornamental tree species were also introduced. 文中还介绍了观赏树木其它方面的用途。
- The more steady ascendent tree species are Q. acutissima, L. formosana, etc. 稳定的优势树种为麻栎、枫香等。
- Tungoiltree is one of the endemic industrial oil tree species in China. 油桐是我国特有的工业用油料树种。
- After the timberline ecological transition zone，the species structure differences between the sunny slope and the shady one decreased and the types of vegetation communities also became similar. 林线生态过渡带结束，阴、阳坡的物种组成差异缩小，植被群落类型也相似。
- Two tree species, gingkgo and metasequoia, were involved in experiment plots. 试验地包括银杏、水杉两个树种。
