根系

Trends of overground physiological and biochemical indexs are almost the same—weak soil Naphthalin pollution stress stimulate them,strong pollution restrain stress them. In the first two weeks of seeding stage weak soil Naphthalin pollution stimulate root activity,but soil Naphthalin pollution stress restrain root activity from the second week till jointing stage, In corn grouting stage soil Naphthalin pollution stress stimulate root activity.

部分的生理生化指标都有促进作用，而高浓度的土壤萘污染胁迫对玉米地上部分的生理生化指标有抑制作用；苗期的前两周低浓度土壤萘污染胁迫对玉米的根系活力有促进作用，苗期第三周到拔节期土壤萘污染胁迫抑制玉米的根系活力，而到了用营养生长到以生殖生长为中心的灌浆期土壤萘污染对玉米的根系活力有促进作用。

Enough K nutrition also promoted the growth of pily root system, raised root system vigor, root system to always absorb an area to reach active absorb an area, but of breed different, its expression is different also, the tall Potassium of excel of low Potassium processing of 13 mixes new Liu Zao contrast processing, in cotton 36 increase performance along with K chroma more actor.

充足的K营养也促进了棉花根系的发育，提高了根系活力、根系总吸收面积及活跃吸收面积，但品种的不同，其表现也不同，新陆早13的低钾处理优于高钾和对照处理，中棉36随K浓度增加表现更优。

The results indicated as pH values in the range from 4.50 to 7.50, the volume and dry weight of root increased as pH values increased, as well as AAAR,TAAR. The relationship of nicotine and total nitrogen accumulation with pH values was parabola,the functions were Y=-61.429X2+391.17X-162.8 (F=l 8.45), Y=-24.3X2+154.88X+52.7 (F=14.40**) respectively. When pH value got rise to 7.50, the accumulation of nicotine and total nitrogen attained the highest .

主要研究结果如下： 1 不同pH值(4.50、5.50、6.50、7.50、8.50)对烤烟根系发育、根系吸收面积以及对烟叶烟碱、总氮、蛋白质和多酚物质积累影响的研究结果表明pH值在4.50～7.50范围内，根系体积和干重都随着pH值上升而增加，AAAR、TAAR也随着升高，烟叶中烟碱、总氮累积量随着pH值上升而增加，烟碱和总氮累积量与pH之间呈抛物线关系，关系式分别为Y=-61.429X~2+391.17X-162.8，F=18.45~；Y=-24.3X~2+154.88X+52.7，F=14.40~，pH值对烟碱和总氮累积量的影响存在极显著差异，当pH值升至7.50时，烟碱和总氮累积量达到最高值。

Bidentis were studied by adopting indoor bioassay. The results showed that the volatile matter of F. bidentis had not allelopathy to four receptor plants. The eluviated matter inhibited seedling growth of cotton obviously, the inhibition ratio of root and stem were 6.29% and 10.42% respectively. The aqueous extract of litterfall and root exudates had different inhibition to four receptor plants, The synthesis effectof all treatments was significantly greater than eluviated matter treatment except for B3 of the aqueous extract of root exudates, such as the synthesis effect of all treatments (A1, A2, A3, B1, B2, B3 and eluviation) were 44.74, 29.37, 14.5, 31.54, 16.52, 3.55, 1.48 respectively.

结果显示：黄顶菊自然挥发物对受体植物不表现化感作用；黄顶菊淋溶物对棉花幼苗生长表现出明显的抑制作用，对棉花幼苗高度和根长的抑制率分别为6.29%和10.42%；黄顶菊枯落物浸提液和根系分泌物浸提液对4种受体植物均表现出不同程度的抑制作用，除了黄顶菊根系分泌物浸提液 B3处理外，其它处理的综合效应均显著大于淋溶物处理，如黄顶菊枯落物浸提液（ A1、 A2、 A3）、根系分泌物浸提液（ B1、 B2、 B3）以及淋溶物等各处理对受体植物的综合效应分别为44.74、29.37、14.5、31.54、16.52、3.55、1.48。

Excessive application of N-fertilizer inhibited root growth in early stage and promoted that in later stage; 6 gplot^(-1) root dry weights reached gradually and overweighed that of 3 gplot^(-1) until 65 d after transplanting, and 6 gplot^(-1) root activities became stronger than that of 3 gplot^(-1) until 55 d after transplanting; The ratios of root/shoot and the root nitrate activities of 6 gplot^(-1) were less active than that of 3 gplot^(-1) since 45 d after transplanting.

施氮过量抑制根系的早期发育，移栽后65d以前6 g盆^(-1)的处理根干重小于3 g盆^(-1)的处理，65d以后6 g盆^(-1)的处理根干重逐渐达到并超过3 g盆^(-1)的处理；移栽后55d以前6 g盆^(-1)的处理根系活力低于3 g盆^(-1)的处理，55d以后6 g盆^(-1)的处理根系活力高于3 g盆^(-1)的处理；移栽后45d以后6 g盆^(-1)的处理的根冠比小于3 g盆^(-1)的处理，6 g盆^(-1)的处理NR活性小于3 g盆^(-1)的处理。

The result shows: in 0~360 kg/hm^2 fertilizer can improve the plant height, dry matter accumulation of maize, nitrogen accumulation, root vigor, leaf nitrate reeducates activity, chlorophyll content and yield, meanwhile the leaves' nitrate reeducates activity, dry matter accumulation and the final output of wheat, root activity and other indicators were significantly correlated; Cultivating under the same conditions and dropping the fertilizer amount from 360 kg/hm^2 to 315 kg/hm^2, the dry matter accumulation will be increased, the roots vigor and leaf nitrate reeducates activity will be strengthened, but the yield are not obviously different in the same treatment.

结果表明：在0~360kg/hm^2的施肥范围内，肥料能显著增加玉米植株的株高、干物质积累盆、叶绿素含量和籽粒产量，提高根系活力、叶片硝酸还原酶活性；同时硝酸还原酶活性、干物质积累量、根系活力和叶绿素含量等指标与玉米最终产量呈显著正相关；在相同的栽培条件下，将施肥量从360kg/hm^2降至315kg/hm^2，植株的于物质积累量增加、根系活力、叶片硝酸还原酶活性增强，但处理间籽粒产量无显著差异。

Research results indicated that the underground biomass changes of three species differed obviously under different traffic treatment. Poa pratensis and Zoysia japonica underground biomass increased at the light traffic then declined. 'Barlexas' Tall fescue decreased with increasing traffic stress. Obvious root shallowing phenomenon is displayed through the increase of roots percent in surface layer and decline in deep layer. Moreover, traffic made the soil density and hardness increase.

结果表明：践踏胁迫下，3种草坪草地下生物量变化表现出较大差异，草地早熟禾和日本结缕草先增加后下降，高羊茅一直呈下降趋势；3种草坪草表层根系（0~5cm）所占比重明显增加，深层根系所占比重减小，根系的表层化现象明显；研究还表明，践踏使表层土壤容重和硬度增加，物理性质恶化。

Under P-deficiency stress, IAA concentration in asparagus bean plant increased, and IAA translocated from shoot to root, then IAA concentration in root increased, and the ratio of IAA concentration in root/that in young stem and leaf increased, then the ratio of root/shoot increased, due to more carbohydrate translocated to root.

缺磷胁迫下长豇豆幼苗IAA浓度升高，并从地上部向根系运转，使根系IAA浓度和根系IAA含量/嫩茎叶IAA含量的比值升高，增强了碳水化合物向根分配的力度，促进了根冠比的提高，对缺磷敏感的二芦白升高最大，因而根冠比也升高最大。

Roots grew preferentially, R/S ratio and phosphorous utilized efficiency are high; As the treated time prolongs, rubber mini-seedling buddings under the treatment of phosphorus deficiency is seriously restrained.

抽生期、古铜期和成熟期根系可溶性糖大量合成蛋白质，IAA含量高、iPA含量低，根系活力强，说明根系生长快、代谢旺盛、吸收能力强；淡绿期、稳定期则相反。

The Cd2+ residues distribution of the corms and yield were also determined.

研究结果表明，叶片和根系的可溶性蛋白含量、根系活力均随Cd2+处理浓度的增加而下降，叶片和根系的细胞膜透性、丙二醛含量则呈上升的趋势。

Fancy gold-plated dangling earrings with facetted White Opal crystals.

花式镀金悬垂耳环与facetted白欧泊水晶。

This essay chooses the study aim from biology teachers in middle school in Shi Jiazhuang which tells us that most of the middle school biology teachers in Shi Jiazhuang have the"burnout", lower successfulness, individualize.

本文选取石家庄市初中生物教师作为研究对象，运用问卷调查的方法对石家庄市初中生物教师职业倦怠的现状进行调查，调查结果发现，石家庄市初中生物教师这一群体普遍存在职业倦怠，情感枯竭程度偏高，成就感偏低，去个性化程度最为严重。