1. The survival of most species under natural conditions is best achieved by non-uniform eds with germination that is spread over months and even years following ed shedding.
在自然状态下，大多数树种的是生存主要是通过种子萌发的不一致性来达到的，即种子从树上脱落好哦可以在几个月甚至几年内陆续发芽，而不是一次性同时发芽。
2. Another good criterion for acorn maturity is easy relea from the cups ; immature acorns are more difficult to parate from their cups.形容舞蹈的成语
另外一个判断标准是看橡实是否容易从壳斗上分离；未成熟的橡实种子很难将种子与壳斗分离。
3. Generally, ed collected from superior individual trees form a large population will be adapted to local environmental conditions and tolerant of incts and dia found locally.
通常，从大量种群中采集的优质的种子将能适应当地的环境并能抵抗当地的病虫害。
4. The tree species of interest and breeding method will determine which type of is most suitable for ed production requirements.
现代教育的特征相关的树种和育种方式决定了哪种种子园最适合种子的生产要求。
5．Record keeping will provide a reference of orchard performance and give insight into productivity and corrective actions that should be taken if problems develop.
记录可以作为种子园表现情况的参考，可以了解种子园的生产力，发生问题时可以根据记录采取补救措施。
6. And various conditions associated with the urban environment may alter specific characteristics of a tree, such as changing the appearance of the leaves of bark that help in tree identification.高潮腮红
与社会环境有关的各种条件可能改变一棵树的特性，比如改变有助于辨别树种的种子或树皮的外部特征。
7. The two situations may greatly extend the range of a tree or reduce it to the point of extinction.
这两种情形可能会大量扩大树木的地理分布范围或减少甚至濒临灭亡。
8. Soil fertility also influences the time that a tree flowers and the numbers of flowers produced.
肥力也影响了树开花时间和开花数量。
红豆诗
9. As edlings overcome competing vegetation mainly by achieving greater size which reduces light to the competition, greater height is an advantage on site where brush competition is a potential problem.
苗木主要通过获得更大的形体以减少竞争者的阳光来战胜竞争的植被，在从林竞争的条件下，拥有更高的形体拥有优势。
10. Along with height and RCD, the height/diameter ratio is thought to an important stock characteristic which influences early plantation performance。
与高度和根茎一样，栽植也是影响苗木早期的特征。
want的同义词11.For example, on dry sites where brush competition is not excessive but desiccating winds are prevalent, smaller edlings may be preferred as a smaller foliar surface area would tend to place less transpirational demand on the not system.
例如，在干旱条件下，丛林竞争不是非常激烈，但燥风很普遍，根系上所承载的压力就很小，这样可以减小根系的蒸腾压力。
12. Differences in edling size among similar containers may result from variations in growing conditions within the nurry, and or from genetic differences among the edlings.
在相似的容器中辉造成苗木大笑不一，主要是因为在苗圃中生长情况有差异以及苗木的基因差异。
13. For example, larger stock was shown to attain a height of six metres 6 to 8 years sooner than comparable smaller stock on the same site, which means that the trees from
the initially larger stock types will reach merchantable size years before trees from the smaller stock.增生性肠息肉
例如，形体较大的苗木比同样类型的小苗木，长到6米时快6至8年，这意味着要成长到可以销售的尺寸，初始的较大的苗木比较小类型的苗木要快几年。
14. Topography, the slope of the land from the horizontal and the compass direction the slope faces, affects the amount of precipitation that enters the parent material or soil and the temperature of the soil.
土壤形成的速度取决于气候条件，特别是年降水量和年平均温度。
15. The principal weathering products are the abundant clay minerals that occur as small particles that cohere to one another and adhere ,to other particles.
主要的风化产物是丰富的粘土矿物，它们作为土壤中的小颗粒，彼此黏结附到其他颗粒上。
合时
16. Most soils consist of mineral particles of different sizes: large particles called gravel ,smaller ones sand , still smaller ones silt, and submicroscopic clay.
多数土壤由大小不同的颗粒组成，大的颗粒称为石砾，小一点的称为沙粒，还笑的称为泥沙，更小的称黏粒。
17. First, soil supports the growth of higher plants mainly by providing a medium for plant roots and supplying nutrient elements that are esntial to the entire plant.
首，土壤通过为根部提供介质和整个植物所必需的养分来维持较高植物的成长。
18. The insulating properties of soil protect the deeper portion of the root system from the extremes of hot and cold that often occur at the soil surface.韩国年糕火锅
土壤的隔热性保护了深层的根部系统免受经常发生在土壤表面的冷热极端。
19. Soils have the capacity to assimilate great quantities of organic waste, turning it into beneficial humus, converting the mineral nutrients in the wastes to forms that can be utiliz
ed by plants and animals, and returning the carbon to the atmosphere as carbon dioxide, where it again will become a part of living organisms through plant photosynthesis.
土壤可以吸收大量的有机废物，并把它变成有益的腐殖质，把废物中的矿物质养分转变成可以被动植物利用的形式并通过光合作用把碳转化成以二氧化碳的形式返回到大自然中。
20. An ecosystem is a biological community in which all the biological (including human beings ) and abiological （physical and chemic ingredients in the environment ） components interact each other by the flows of energy and nutrient cycling.
