树种

The stem flow of spruce and larch had acidulation on the soil, but the soil around the bole of spruce didn't present intensive acidity (the lowest pH of water and KCl immersion were 5.13 and 4.79, respectively), so the acidulation of stem flow is not the direct reason of spruce death.

虽然两树种树干径流对土壤均产生了酸化作用，但由于云杉树干周围土壤PH并没有出现较强的酸性（水浸pH下降到5.13，盐浸pH下降到4.79），因此，还不能认为云杉的衰退死亡与树干径流的酸化作用有直接关系。

The pure and mixing afforest matters are used for the spatial structure.

调查发现，各模式树种生长良好，产生较好的效果。

Oriental oak is one of the most important afforestation tree species.

栓皮栎是我国重要的造林树种之一。

The natural distributing populations of the indigenous timber species--Cordia africana that grew in and around the area of Mizan Teferi in Ethiopia were investigated. Bulk seed samples were selected from ten phenotypically superior trees in different natural populations. They were evaluated through the performance of their half-sibs and especially examined for variability in seed morphometrics, seed germination, and seedling growth at nursery stage.

通过对埃塞俄比亚Mizan Teferi及周边地区生长的乡土用材树种--非洲破布木自然种群分布情况调查，筛选了10株生长表现型较好的优良母树，采集了大量的供试种子样品，并对其种子外部特征和在苗圃中的发芽率和种苗生长表现进行了观察和分析对比。

With methods of limited areas, root systems of plant individuals were limited in a specific range, providing definite spatial boundary and solid basis for calculation of water requirement needed by plant individuals. On the basis of calculation of amount of water requirement, areas needed by every species to ensure enough water requirement are as follows: Populus simonii is 80.3m〓, Ulmus macrocarpa is 35. 4m〓, Artemisia halodendron is 7. 0m〓, Salix gordejvii is 11. 2m〓. Prunus armeniaca is 15. 2m〓, and Caragana microphylla is 15. 6m〓. The corresponding rational density of plantation which can maintain soil water balance and can ensure plantation stability is 125 individuals/ha for Populus simonii, 285 individuals/ha for Ulmus macrocarpa, 625 individuals/ha for Prunus armeniaca, 625 individuals/ha for Caragana microphylla, 833 individuals/ha for Salix gordejvii, and 1428 individuals/ha for Artemisia halodendron, respectively.

运用有限面积法将植物根系限制在明确的边界内，为植物耗水量的计算提供了一个明确的空间边界范围和可靠的基础，探索性和尝试性地得出了近似野外真实状态下植物个体的耗水量，以此为基础计算得出小叶锦鸡儿、山杏、黄柳、差巴嘎蒿、榆树、杨树等树种的水分营养面积分别是15.6m〓、15.2m〓、11.2m〓、7.0m〓、35.4m〓和80.3m〓，与此对应的能够维持林地土壤水分平衡和林分稳定性的各树种人工林的合理密度为：杨树125株/公顷，榆树285株/公顷，杏树625株/公顷，小叶锦鸡儿625株/公顷，黄柳833株/公顷，差巴嘎蒿1428株/公顷。

The time of releasing is different within different species, but many kinds of volatiles widely existed in different trees.

不同树种在释放时间上也存在明显差异，但有些化合物广泛存在于不同树种。

For four yuan Bridge, the four-Bridge, Shibalidian bridges Block 13 overpass around the green belt and Chaoyang Park, the red scarf Park, fired criminal Lake Park, 18 large public green spaces, garden experts in the design, determine to planting large trees specifications mainly determined 2-3 keynote species and 7-8 major species to the natural-style tablet Hunjiao, a large group of ambitious momentum for the City of Victoria Road green spots become all Parts of the show.

对于四元桥、四惠桥、十八里店桥等13座立交桥的周围绿化带和朝阳公园、红领巾公园、窑洼湖公园等18个大型公共绿地，园林专家们在设计上，确定以栽种大规格乔木为主，确定2至3个基调树种和7至8个主要树种，以自然式片状混交、大型组团方式形成宏大的气势，让这些景点成为四环路绿化全线的精彩片段。

Through discussing the urban forest connotation, this paper pointed out some existing problems of tree species selection in present urban forest culture, and raised the urban forest culture tree species selection principle.

通过对城市森林内涵的探讨，指出了当前城市森林培育中树种选择存在的一些问题，提出了城市森林培育树种选择的原则。

Historical sites: the southern slope of Kawamura Red-billed Hill, since the beginning of the spring of 1964, the provincial model workers Guo Shan, 23 after the Spring and Autumn Period, the practice of repeatedly and continuously explore, to create a land-for-drought level terrace renovation sik Tree technology, in order to move fortitude striking more than 42,000 cubic meters of earth, iron mill bald Catalpa low post and the first 17, 753 to renovate into a high-standard terraced fields, planting 125 acres, planted fruit, pears, peaches, apricots and other economic and elm trees, Chun, Huai Yang, pine and cypress trees, and other ecological 10,000 a total of more than 3.84, in the past so that the bald ridge of barren hills into a tree, pear fragrance of the landscape, Guo Shan as the "Red-billed the new hill-yu Public,"Red-billed Hill will be listed as one of the eight new Ning.

名胜古迹：南坡川村红嘴山，自1964年春开始，省劳动模范郭富山，历经二十三个春秋，反复实践，不断摸索，创造出抗旱换土水平梯田整修植树技术，以惊人的毅力移动土方42000多立方米，磨秃铁楸和橛头17把，修整成753块高标准梯田，造林125亩，栽种果、梨、桃、杏等经济树种和榆、椿、槐、杨、松柏等生态树种共3.84多万株，使过去的荒山秃岭变成了绿树成荫，梨果飘香的风景之地，郭富山被誉为&红嘴山上新愚公&，红嘴山被列为会宁新八景之一。

It is shown that it is difficulty to differentiate each vegetation type among sub-tropical evergreen forest, sub-tropical coniferous forest and sub-tropical deciduous forest because of the mixture of their tree spectra. According to the reflection index in the wavelengths of 750 nm to 1 100 nm, the tree species can be divided into 4 groups with descend in reflectivity. Each tree specie can be differentiated from each other according to its slope of the spectrum curve and its reflection index in the wavelengths of 770 nm to 1 010 nm for each forest vegetation type. The unique first order derivative feature can be used to identify litsea, alder, fir, red birch, southwest birch, large schima confertiflora, taiwania flousian and small leaf schima confertiflora.

研究表明：亚热带常绿阔叶林、亚热带针叶林和亚热带落叶阔叶林等植被类型，因其树种间光谱特征混淆严重，而难以彼此区分；根据其反射率在750~1 100 nm范围上的差异，可将其归为4类；就各植被类型而言，其树种间在光谱曲线坡度，以及在770~1 010 nm范围上具有显著差异，可据此将其区分；木姜子、桤木、杉木、红桦、大叶木荷、秃杉和小叶木荷等因具有独特的光谱一阶导数特征，据此可以识别提取。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。