乔木的

The results showed that the most part of the carbon storage of a stand was allo...

乔木层单位面积碳储量与乔木密度的幂指数为-0.0756。

Populus euphratica heteromorphic leaves can adapt different environment in different developmental stages through the changes of leaf shape,anatomical structure,physiological metabolism and protein expression,which can be presumed as the major reason for Populus euphratica survival in the arid and semi-arid desert region.

胡杨的异形叶能通过形态、结构、生理代谢及蛋白质表达水平上的变化来更好的适应不同发育时期生存环境的改变，推测这就是其优于其他树种而能在荒漠地带生存至今，成为干旱荒漠地区唯一天然存在的高大乔木的原因。

The carbon storage in different organs was positively related to the biomass of corresponding organs. Stem accumulated the highest carbon storage, comprised 52.20% of carbon storage in overstory trees, the rest in branch, leaf, bark and root, etc., seized 47.80%. The annual net productivity of 7-year-old A. crossicarpa plantation was 20.06 t/(hm^2a) and annual carbon fixation was up to 9.86t/(hm^2a).

厚荚相思各器官碳贮量与其生物量成正比例关系，树干的碳贮量最高，占乔木层碳贮量的52.20%，树枝、树叶、树皮和树根等碳贮量共占乔木层的47.80%。7年生厚荚相思人工林乔木层年净生产力为20.06t/(hm^2a)，碳素年净固定量为9.86t/(hm^2a)。

Small genus of deciduous trees of China and United States having paniculate flowers and thick pulpy pods.

在中国和美国长有圆锥花序的花和稠密的果肉状的扁豆层的每年落叶的乔木的小属。

Large genus of tropical trees having pinnate leaves and paniculate flowers and cultivated commercially for their dramatically grained and colored timbers.

在商业上因为它们的引人注目的条纹并长有羽状叶子和有圆锥花序的花的热带乔木的大的属。

Asian (47.4%) and temperate genera mainly constituted by North temperate (50%) and E. Asian (50%). So that the geographical elements are discomplex. In the 25 species of arborous layer, 76% is the middle subtropical zonal type, 16% south subtropical zonal type and 8% north subtropical zonal type, of which the first 6 positions of important value index were all middle subtropical zonal type. This showed that the community was subtropical characteristic. There are 59.5% evergreen and 40.5% deblade of 79 known species in which the mid-phaenerophytes is the first position of all, accounting for 27.8%, and the evergreen broad-leaved species constituted the majority of meso-phaenerophytes which accounts for 15.2%.

乔木层多数优势种为稳定型种群，所以乔木层优势区系成分相当稳定，表明该群落为一种顶极群落。59个种子植物属只有10个分布区类型和4个变型，地理成分不复杂，其中热带分布27属占46.6%，温带分布31属占53.4%；热带分布以泛热带和热带亚洲分布为主，分别占52.6%和47.4%，温带分布为北温带和东亚分布各占50%。25个乔木层树种中，中亚热带地理分布类型的占76%，南亚热带地理分布类型的占16%，北亚热带地理分布类型占8%，重要值指数排列前6名的均为中亚热带地理分布类型，所以该群落为亚热带性质。

Meso phanerophytes and micro phanerophytes are main composing plant of arbor synusia in the area.In synusia structure,except for the warm shrubs,frost flora all have arbor synusia,shrub synusia,herbage synusia and lichen synusia.The evergreen broad leaved meso phanerophytessynusia dominates the arbor layer .

在层片结构上，森林植物群落除暖性灌丛外，都具有乔木层层片、灌木层层片、草本层层片和苔藓地被层层片，常绿阔叶中高位芽层片为乔木层主要层片，并多构成群落的建群层片。

However remarkable impacts were observed in the plantation in terms of community physiognomy,community structure,species composition,species richness,and biomass accumulation.1 Planting trees made community structure simple.Betula alnoidis plantation had three layers including a dominant arbor layer,a complex and well developed shrub layer and a poorly developed vine layer.The arbor layer contained few species and had a single layer.The mountain rain forest had 4 layers including the dominant arbor layer,shrub layer,grass layer and vine layer.The vine layer was well developed and very rich in species composition,and the arbor layer contained as many as 38 species that could be grouped into 3 layers.2 Sequenced by the important value,main species for the plantation and the nature forest were totally different,and the plantation had one dominant species while the nature forest contained many dominant species.3 Planting trees changed the community physiognomy.

但是人工种植西南桦林对群落的季相外貌、群落的结构、物种组成、物种丰富度以及生物量等方面有较大的影响。1人工造林使得群落结构简化，西南桦人工林的层次结构有3层，以乔木层占优势，并且有种类多而发达的灌木层，同时，藤本植物欠发达，但是乔木层树种单一，明显仅有一层；山地雨林的层次结构有4层，以乔木层占优势，还有灌木层、草本层和藤本植物，藤本植物种类多，十分发达；乔木层树种丰富，可达38种，乔木层还可分为3层。2人工造林较大程度地改变了群落的物种组成，根据重要值的大小排列，人工林和天然林的主要物种组成已经完全不同；并且人工林单优树种明显，而天然林就含有较多的优势树种。3人工造林改变了群落的外貌。

So we make the linear regression multianalysis between eigenvalues of bird distribution and plant elements, the results show that bird distribution has remarkably linear relation to average height of top tree, arboreal cover, shrub cover, diversity of horizontal and surrounding habitats.

因此运用植物群落学、数理统计分析方法，对可能影响鸟类分布特征值的植物景观因子及其它因子，进行多元线性回归分析，结果表明园林空间鸟类分布与乔木上层平均高度、乔木层盖度、灌木层盖度、水平生境多样性和周围生境复杂程度有显著线性关系。

For slender branch sweet vetch which is up to 40.6% only, and analysis of variance proves that sand willow shrub forest reducing close stratum effect of wind speed has obvious advantages fully too. The seventh, there are many aspects of ecological benefit of city forest in arid and semi-arid areas.

第六、根据多目标灰色关联度评价结果，适应干旱半干旱风沙区城镇庭院绿化的针叶乔木树种为：云杉、落叶松和樟子松，其关联度评价值分别达到0.7720、0.7718和0.7622；落叶阔叶乔木树种为：山桃、垂柳、垂榆，其关联度评价值分别达到0.9554、0.8631和0.8362；花灌木树种为：玫瑰、沙地柏和黄刺玫，其关联度评价值分别达到0.7916、0.7730和0.7492。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。