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The result showed that net photosynthetic rate in leaves of sunny positions for Populus euphratica Oliv appeared in curvilinear changes with double peaks and apparent middy depression diurnally,however,the leaves of shade positions appeared in curvilinear changes with single peaks.

结果表明：在生长季胡杨阳叶光合速率的日变化呈现双峰曲线，具有明显的光合"午休"现象，但胡杨阴叶光合速率的日变化呈单峰曲线。

Small tropical tree with tiered branches and divaricate branchlets having broad glossy dark green leaves; exploited for its edible young leaves and seeds that provide a fine flour.

热带一种小型树种，层状树枝和展开的分叉，叶宽大，有光泽，墨绿色；嫩叶和种子是一种面粉的来源。

In chapter 2, the contents of loureirins in the roots, stems and leaves of Dracaena cochinchinenis were analyzed by HPLC. On the other hand, using the preparation chromatography technology, five compounds were isolated from the leaves of Dracaena cochinchinenis, their structures were identified by means of spectral and chemical methods. They are steroidal saponins.

第二章主要是利用HPLC技术对剑叶龙血树根、茎、叶中龙血素成分的分析与探讨，并利用制备色谱等技术对剑叶龙血树叶子组成成分进行了分析、研究，得到化合物5个，经波谱鉴定，这5个化合物均是幽体皂贰类化合物。

The analysis of the chemical constitutes among sterns roots and leaves of Dracaena cochinchinenis, showed that there' s small amount loureirin A in their extracts, with 0.053mg/g, 0.058mg/g, 0.015mg/g respectively only. Therefore, the roots, stems and leaves of Dracaena cochinchinenis have too low contents of loureirins to be raw materials of dragon's blood.

分析剑叶龙血树根、茎、叶的成分，发现风干的剑叶龙血树根、茎、叶中没有龙血素B的存在，只含有少量的龙血素A，其含量在根、茎、叶中分别为：0.058mg/g，0.053mg/g，0.015mg/g，其含量远低于现行的龙血竭中龙血素A含量不低于2％的质检标准，因此剑叶龙血树的根、茎、叶不能直接用作生产龙血竭的原料。

Effects of water stress on the level of reactive oxygen speciesand activities of antioxidant enzymes in the leaves of wheat(Triticum durum Desf.) seedlings were investigated.Water stress resulted in significant increase in the contents of O-.2,MDA and the activities of superoxide dismutase and ascorbate peroxidase in wheat leaves.However,the activities of glutathione reductase,catalase and the content of H2O2 were not changed obviously under water stress.

分析了水分胁迫对小麦幼苗叶片中活性氧水平和抗氧化酶活性的影响，结果发现，水分胁迫能够显著提高超氧阴离子(O-2·)和丙二醛的含量及超氧化物歧化酶和抗坏血酸过氧化物酶的活性，而过氧化氢(H2O2)的含量及过氧化氢酶和谷胱甘肽还原酶的活性变化不明显。

Developmengts anslysis on plant high, caulis leaves and single fruit showed with coincident disciplinarian, but distributing unlikeness. From seedling time to flourishing time, 2 importing varities's developments curve were keeping epigyny, showed that importing tomatoes varities had obvious advantage on plant high, caulis leaves and single fruit, and had bigger increase production potential.

株高、主茎叶片数和单株果数等3个测试指标的动态分析表明，规律一致但分布不同，2个进口品种的动态曲线从苗期到盛果期始终保持上位，说明进口品种在株高、主茎叶片数和单株果数3个生长发育指标上具有明显优势，植株生长旺盛，增产潜力大。

The nonoverlapping pattern of leaves on a plant that results mainly from the genetically programmed arrangement of leaves and branches, and in some species also by the twisting of the petioles due to EPINASTY.

在某些植物中也可能由于叶的偏上性而发生扭曲的结果。

The results showed that with the normal dosage 60g/hm2, inhibiting rate of the plant height and weight of Taiyu 2, Jinzhenzhu, Taiyu 15, Zinuo and other three breeds are beyond 40% and 30%, and it is obvious that plant growing is inhibited, the leaves etiolate and new leaves twist severely and couldn't grow normally. Inhibiting rate of the plant height of Ziyu 2, Taiyu 2, Liaoyu 18, Ludan 50, Zhengdan 958 and some other varieties are between 30.6% and 38.1%, the sensitivity of these varieties are lower and the plant modalities are not influenced bigger; in addition, Nongda 108, Nongda 2008, Xinyu 958 and Taiyu 12 grow healthy, the resistance to nicosulfuron are higher compared with other varieties.

温室盆栽测定结果表明，在烟嘧磺隆大田常规用量60g ai/hm2下，各品种对药剂的敏感性差异显著，泰玉2号、金珍珠、泰玉15号、紫糯等7个品种对烟嘧磺隆表现较为敏感，株高抑制率均在40.4%以上，鲜重抑制率在31.37%以上，表现为植株生长受到抑制，叶片黄化，新叶牛尾状扭曲不能正常抽出；淄玉2号、泰玉2号、聊玉18、鲁单50、鲁原单14、郑单958等品种的株高抑制率在30.6%～38.1%，敏感性略低；而农大2008、农大108、鑫玉958和泰玉12号生长正常，耐药性相对较高，无明显药害症状。

Compared with other methods, the effect on preservation of the cut flowers, pretreated in 100 ml/L benzalkonium bromide for 3 hours, was obvious. The fresh flower weights increased slowly, few or none leaves were wilting after transplanted into water for 6 days. Etiolation of the leave slowed down and almost 90% leaves kept fresh after 12 days. The flower buds blooming speed also slowed down, 50% of flower buds were opened, petals were kept fresh, the stems of cut flower were unbent, and none flowers were drooped after 15 days.

与其他预处理相比，在100 ml/L溶液预处理3h，瓶插后鲜重一直呈缓慢上升趋势；6d后，极少数叶片发生萎蔫，叶片黄化速度也很缓慢，约90％的叶片12d后还可以保持新鲜；花蕾开放速度也缓慢，15d后仅有50％的花蕾开花，且花瓣挺阔，无枯萎迹象，而且茎干挺直，不弯颈；保鲜效果明显高于其他的预处理。

The physiological disease, leaf etiolation, can easily occur in young tea trees planted in brown soil with higher pH value (＞6.5) in Shandong province. All leaves of some trees turned yellow, some leaves of new shoots turned white to a certain extent or had some brown spots on the yellow leaf margin.

在山东pH偏高（＞6.5）的棕壤幼龄茶园中，茶树容易发生失绿黄化病症，严重影响了新建茶园的成园速度。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。