根系

Apeak distribution of root system in maize along soil profile as following: In flare opening stage peak value of dry weight of root in 0-20cm, dry weight of root reduced quickly with the increasing soil layer thickness.

根系干重在土壤中的垂直分布情况为：在大喇叭口期以前，根系干重峰值出现在10-20cm的土层内，而后随着土层深度的增加根系干重迅速下降。

Results indicated that the variation was significant from treatment to treatment. S-deficiency caused bulging chloroplasts, loosening and dishevelled grana lamella, reducing organelle, and damaged chondriosome in mesophyll cells of the leaves, and empty cells of the roots, while S-excess, however, led to densification, condensation and randomization of grana lamella of the chloroplasts of the leaves, and separation of cytoplasms from walls of the cells of the roots.

结果表明，受S素营养胁迫的水稻，其根系及叶片的超微结构均发生了显著的变化：低S胁迫会造成水稻叶片叶肉细胞内的叶绿体结构肿胀，基粒片层松驰、散乱，细胞器减少，线粒体结构被破坏，根系细胞内几乎没有内含物；S浓度高则会使叶片叶绿体基粒片层致密、浓缩，无规则化，根系细胞发生质壁分离。

The study is carried out that the comparison of fine root production, decomposition and distribution along with Korean pine and broad-leaved climax forest succession; the fine root contribution to the belowground C and N storage along with Korean pine and broad-leaved climax forest succession; and the comparison of belowground C and N storage among the Korean pine and broad-leaved climax forest, three dark-conifer forests, a betula ermanii forest along altitude.

研究内容包括：原始阔叶红松林及其不同演替阶段的次生林中细根的生长和周转、分解与分布的特征，阐明在不同演替阶段细根的变化；原始阔叶红松林及其不同演替阶段的次生林中细根对根系、土壤和林地地下的碳、氮贮量的影响，分析在不同演替阶段细根周转对地下碳、氮贮量的贡献；以及对不同垂直海拔高度分布的不同类型的原始森林中细根和根系生物量的变化，及细根对根系、土壤和林地地下碳、氮贮量的贡献进行了研究。

The inhibitive effect of 1, 2-benzenedicarboxylic acid on the absorption of N, P and K increased with its concentration rising. Low concentration of dibutyl phthalate increased the absorption of N, but decreased the absorption of P and K. Its high concentration restrained the absorption of N, P and K, while the low concentration of diphenylamine could stimulate the absorption of N and K, but restrain the absorption of P.

随着邻苯二甲酸浓度的增加，其对番茄幼苗根系吸收N、P、K的抑制作用增强；低浓度的邻苯二甲酸二丁酯可以促进番茄幼苗根系对N的吸收，抑制对P、K的吸收，高浓度时对N、P、K的吸收均起抑制作用；低浓度的二苯胺可以促进番茄幼苗根系对N、K的吸收，抑制对P的吸收。

In this paper, the methods for the study of root exudates, including collection, isolation, purification and identification, are reviewed.

本文着重讨论根系分泌物收集、分离纯化及鉴定的常用方法，并列举特定根系分泌物的研究方法，旨在为根系分泌物的研究提供借鉴和参考。

The results show that humate compound fertilizer significantly increases root fresh weight and vigor of wheat both in the 0~20 cm and 20~40 cm soil layers, promoting root growth in these layers.

结果表明，两种供水条件下，腐植酸复合肥均可显著提高0~20 cm和20~40 cm土层小麦根系鲜重和根系活力，促进根系生长发育。

In order to explode and use Lespedeza, the thesis is divided into three main parts: root system growth and development research of Lespedeze bicolor Turcz., effect of cutting frequency on root system and aboveground part biomass and effect of cutting and germinating on endogenous hormone of root system.

为了为进一步开发和利用胡枝子资源，本文做了以下研究：对二色胡枝子根系生长发育的研究、刈割频度对根系及地上生物量的影响的研究及刈割和萌蘖对根系内源激素的影响的研究。

There were high positive correlations between activity of root and photosynthetic rate of flag leaf, ZRs content and activity in root, ZRs content and photosynthetic rate in flag leaf respectively.

根系活力的下降速度和叶片的叶绿素下降速度相比，根系活力的下降大于叶绿素的下降，根系活力的衰退先于叶片的功能衰退。

Fertilizing date presented obvious effects on root growth and distribution. Fertilization after watering was more primitive to the root in up-soil layers than before watering. Fertilization of Ca-Mg was positive to the increase of root in 5-15cm soil layer, but negative to that in the surface layer. Both fertilization date and Ca-Mg fertilizer affected root vigor obviously.

施肥时期对根系也具有明显的影响，与灌水前施肥相比，灌水后施肥有利于促进根系在上层土壤中的生长和分布；钙镁肥的施用能增加5~15cm土层根重，但对表层根的生长不利，施肥时期和钙镁肥施用与否对根系活力的影响也较大。

The amount ofethylene release by shoot apex and root showed no difference between iron-deficient treatment and control plants above before the appearance ofrelatively high reductase activity,which indicated that ethylene may not playa direct role in regulation of root ferric reductase activity,and the inhibitionof which by〓and〓may be caused by other reasons.

缺铁处理植株茎尖和根系乙烯释放量的测定结果显示，三种植物中，缺铁与对照植株的茎尖及根系所释放的乙烯可能不直接参与缺铁根系还原酶的调控，〓和〓对缺铁根系〓还原酶活性的抑制可能是其它原因所致。

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。