比根

Seasonal variation of the distributions of microorganism in the root-zones of wetland plants (Phragmites australis, Zizania latifolia, Zizania latifolia etc.), the substrate layers of control SSPs, together with the effects of wastewater treatment were studied. The results are as follows: the numbers of microorganisms in the different plant root-zones were different; the purification effects were also different. The number of microorganisms in the substrate of the control plot becomes smaller with increasing depth. The numbers of bacteria in fall were higher than those in the summer for the three plant zones and the control, and the number of fungi and actinomyces in summer was much higher than that in the fall for control. As for fungi and actinomyces in the experimental systems, most of their difference between the summer and fall were not as big as that in the control.

通过对不同季节芦苇、茭白和香蒲等湿地系统植物根区、无植物对照基质微生物分布状况以及净化效果的研究，结果显示：（1）种植不同植物的湿地系统根区微生物数量不同，其湿地净化效果也不同；（2）对照系统微生物的数量随基质深度的增加而递减；（3）季节变化显示湿地系统秋季的细菌总数量比夏季高；但对照系统夏季的真菌和放线菌数量明显高于秋季；（4）湿地系统TP的去除率夏季高于秋季。

As compared with the traditional irrigation-traditional fertilization, the following results of the improved traditional irrigation-optimized fertilization were obtained: reduced tiller number per unit area, lower percentage of the tiller ear number/the tiller number, the decreased ear number per unit area, the greatly reduced grain number per ear (1999-2000) and like weight of 1, 000 grains; almost the same plant height; shorter base internode length, a bit more weight per unit internode length, longer internode length under ear; lower LAI values in middle and later stages; coincident process of dry matter accumulation from straight growth onwards, a little more dry matter accumulation amount from earing to maturity; shorter and thicker flag leaf, 2〓 leaf, 3〓 leaf and 4〓 leaf from top, reduced total area of these leave; bigger mean canopy leaf tilt angle, smaller light extinction coefficient , higher ratio of light penetration in the upper, middle and lower parts of the wheat canopy, and tighter plant type; almost identical dynamic change of flag leaf chlorophyll content; and almost the same root amount in 0-120cm soil layer, smaller rate of progressive decrease of the root length density and root weight density with soil getting deep and relatively increased root amount in deeper soil layers.

在传统灌溉-优化施肥条件下，冬小麦单位面积总分蘖数比传统水肥减少，成穗率降低，单位面积穗数有所减少，穗粒数、千粒重无显著性差异；株高基本无变化；基部节间长度缩短，充实度略微增高，穗下节间增长；中后期叶面积指数略低于传统水肥；起身至成熟干物质积累量动态变化过程与传统水肥十分接近，但抽穗至成熟形成的干物质量增加；旗叶、倒2叶倒3叶、倒4叶叶长及总叶面积有所减少，叶片相对增厚；冠层平均叶倾角大，消光系数小，冠层各层的透光率较高，株型紧凑；旗叶叶绿素含量动态变化与传统水肥十分接近；0-120cm土层总根量与传统水肥也差异不大，但根长密度和根重密度随土层深度递减速度较慢，根系在下层土壤的分布相对增多。

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。

Arc plasma has many advantages, such as high temperature、 high energydensity and so on. It has been applied in the field of cutting、 welding、 metallurgyand material prepared etc, but there is a long-term problem in the field of the arcplasma technology, which is how to reduce cathode erosion to increase the life-timeof arc plasma generator, so many scholars in the world have been studying theproblem on the cathode erosion.

电弧等离子体具有温度高、能量密度大和对环境污染小等特点，它已被广泛应用于切割、焊接、冶金、材料制备等领域，但是在电弧等离子体技术中，怎样减少阴极烧损提高等离子体发生器的寿命是电弧等离子体技术中一个长期问题，因而国内外的许多学者仍在对阴极烧损这个问题进行研究；本文围绕&通过提高阴极表面温度，增强阴极表面的电子发射能力，来增大阴极弧根直径，进而降低电弧通过阴极弧根传入阴极表面的有效比热流，以达到减小阴极烧损的目的。&

It is difficult to select the lactic acid high-producing strain by observing the color change zone because of spreading grow along the solid medium of Rhizopus oryzae. A serious of methods for selection and breeding of L-lactic acid high-producing mutant were developed.

米根霉在固体平板上生成的乳酸会使培养基中加入的pH指示剂变色，在菌落周围呈现出变色圈，但由于丝状真菌米根霉在固体培养基表面蔓延生长的特性，使得无法得到单菌落，进而无法通过观察变色圈与菌落直径之比来比较出各菌株产酸能力的高低。

Seedlings with mycorrhiza have more apparent resistance to temperature stresses than those without, that is, good results shows in its cold resistance and heat resistance.

带有菌根的西南桦苗木比没有菌根的苗木能显著提高其耐温度胁迫能力，在抗寒性与抗热性两个方面都取得了较好的效果。

The results show that:①The forest soils have the stronger nitrification, but also the nitrification in surface horizon is stronger than the undersoils.

结果表明：①森林土壤有较强的硝化活性，且表土层比底层土强，同时根际土利于硝化作用进行，根际效应R/S在4.5左右；②淹水厌气培养24h，-N的消失率为52％？

The response may change the fate of the turions in the second year,and affect the maintenance of the populations.

在野外池塘中，利用3种不同营养状况的底质研究底质营养盐对菹草生长及养分分配的影响，结果表明：沉水植物菹草面对底质营养盐的胁迫出现了急性的生理生化反应，在生长初期叶片总的可溶性糖含量在肥沃的底质上高于贫营养底质上；根、茎、叶和石芽各构件都具有异速生长现象，并且表现规律不一样；菹草的根冠比随底质营养盐的不同而变化；随着营养条件对菹草生长胁迫加重，根、冠的异速生长愈明显，同时石芽的N∶P和C∶N比率显著受底质营养盐的影响，而菹草叶片和茎N∶P和C∶N比率不受底质肥力的影响，这些响应将改变石芽第2年的命运和影响种群的维持；在胁迫生境下，菹草首先分配资源到无性繁殖体--石芽上以便维持种群的延续，以回避策略应对底质营养盐胁迫。

The maximum root growth of every treatment was at the pod-ding stage,except that with no fertilizer and no subsoiling treatment.

在结荚期、A处理根重及根长比B＇分别增长41％和91％。

Pumpkin ( Cucurbita moschata Duch.)'No.1 Shengzhen'was used as rootstock for melon ( Cucumis melo L.)'Yumeiren'in this experiment, and the own-root plant was used as control. The results showed that the root active absorption capability of grafted melon plants with pumpkin stock increased. The quantity of xylem sap of grafted melon was more than own-root. The absorption capabilities of nitrogen and potassium were higher, but lower for phosphorus than the control.

提要 以薄皮甜瓜品种'玉美人'作接穗，以白籽南瓜'圣砧一号'为砧木进行嫁接，以自根苗为对照的结果表明，嫁接植株的南瓜根系主动吸收能力增强，其伤流量比自根植株的大，植株吸收氮钾的能力高于自根植株，而吸收磷的能力则有所降低。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失