丛生

The Farming-pastoral Zone in North China was separated into 8 Eco-regions according to the known Eco-region. The dissertation analyzed the regional differences of land use changes from three aspects on dynamic degree , land use degree and the change direction (1)On land use dynamic degree, the dynamic degree of the cropland was the highest in North warm temperate deciduous broad-leaved forest and the lowest in temperate forest steppe; forest land's was the highest in alpine meadow and the lowest in warm temperate forest steppe; grassland's was the highest in temperate forest steppe-bunchgrass steppe and the lowest in alpine meadow; other land's was the highest in North warm temperate deciduous broad-leaved forest－the Huang-Huai-hai plain and the lowest in warm temperate bunchgrass steppe.

结合已有的自然生态区的划分，将我国北方农牧交错带划分为8 个自然生态区，选取土地利用动态度、土地利用程度以及土地利用变化方向等3 个方面的指标对研究区进行了区域分异规律的研究，结果如下：（1）耕地动态度北暖温带落叶阔叶林生态区——北部山地丘陵区最大，温带森林草原生态区最小；林地的动态度高寒草甸生态区最大，暖温带森林草原丛生禾草草原生态区——东南森林草原区最小；草地动态度温带森林草原——丛生禾草草原生态区最大，高寒草甸生态区最小；其他用地的动态度北暖温带落叶阔叶林生态区——黄淮海平原区最大，暖温带森林草原丛生禾草草原生态区—西北丛生禾草草原区最小。

The effect of bud-inducing and multiplication was better on the medium MS+6-BA2.0mg/L+NAA0.2mg/L,and the inducing rate of asepsis plantlet was 80%, the inducing rate of clumpy buds was 100％.

在以MS+6-BA2.0mg/L+NAA0.2mg/L的培养基中进行的不定芽诱导生长和继代培养，诱导和增殖效果较好，丛生芽的一代诱导率为80%，二代以后丛生芽诱导率为100%。

The apical buds and axillary buds of Dracaena cambodiana Pierre ex Gagnep. were inoculated on MS medium containing 1 mg/L BA, 0.1 mg/L NAA, 100 mg/L PVP and 30 g/L sucrose for inducing shoots. After cultured for 40~50 d, the shoots bourgeoned. They were then transferred onto MS medium supplemented with 2 mg/L BA, 0.5 mg/L KT and 30 g/L sucrose for inducing clustered buds. After 25~10 d, the clustered buds formed. The proliferation rate of the clustered buds was 300%~500% per month.

以海南龙血树的顶芽和侧芽作为外植体，把其接种于MS+BA 1 mg/L+NAA0.1 mg/L+PVP100 mg/L+蔗糖30 g/L培养基上培养40~50 d可诱导其腋芽萌发，再把萌发后所形成的新芽切割下来接种于MS+BA 2mg/L+KT 0.5 mg/L+蔗糖30 g/L的培养基上培养25~30 d可诱导形成丛生芽，丛生芽在继代培养过程中每25~30 d可增殖3~5倍。

By analyzing the tissue-specific expression in 35-day-old plants, AtMAPR2 was expressed higher in flower, rosette leaf, and silique; while AtMAPR3 was expressed higher in flowers, roots, rosette leaf; AtMAPR4 and AtMAPR5 were expressed higher in flowers.

而三十五天的器官特异性分析，可观察到AtMAPR2对花、丛生叶与长角果；AtMAPR3对花、根、丛生叶；AtMAPR4、AtMAPR5对花具有器官特异性。

E ., carrgeenin gum 7 g/L, Ph 5.8-6.0 and light intensities 2000-3000 lx, were proper to the proliferation and development of axillary buds. The brown could he restrained effectively when the Vc(0.05 g/L.) was supplemented in the proliferation medium. The GA3 was not suitable for the proliferation of axillary buds of slash pine.

当卡拉胶为7 g/L、pH为5.8~6.0、光照度为2000~3000 lx时有利于湿地松丛生芽的增殖和生长；培养基中添加抗坏血酸0.05 g/L能有效抑制湿地松丛生芽增殖过程中褐化物质的产生，而赤霉素的添加则不利于湿地松丛生芽的增殖和生长。

According to our result, the regeneration rate of embryonic tips explants was obviously higher than that of cotyledonary nodes when the concentration of 6-BA was from 0.5mg/L to 1.0mg/L, and the optimal inducing time was 5d.

理想的遗传转化受体系统不仅要有较高的植株再生率，而且要有一定的丛生芽数目。利用0.5～1.0 mg/L的6-BA诱导培养5d，大豆胚尖的出芽率、植株再生率及胚尖丛生芽数等综合指标较好。

Effect of 6-BA on regeneration of cotyledonary node including germination of seedlings, multiple shoots induction and shoots elongation from soybean cultivars "heinong 35" were studied.

以大豆品种黑农35的子叶节为材料，研究6-BA对子叶节再生三个阶段即无菌苗萌发、丛生芽诱导、丛生芽伸长的影响。

Statistic analysis indicated that the main factor which influenced callus induction and the inducting rate of fasciculated shoots were explant, the optimal medium for callus induction was MS+1.0mg/L BA+1.0mg/L NAA+0.5mg/L 2,4-D+Leaves.

论文摘要：采用正交设计方法，研究了6-BA、NAA、2，4-D及外植体4种不同因素及其组合对钟花樱愈伤组织及丛生芽诱导率的影响，试验结果统计分析表明：外植体是诱导愈伤组织和诱导丛生芽的最主要因素。

The moisture change and dimensional stability of the sympodial bamboo floor made in India and the commercial moso bamboo flooring made in China under indoor hygrothermal environment that simulated condition of winter and summer were studied in this paper.

模拟冬季和夏季室内湿热环境条件，对国产毛竹地板和印度丛生竹地板进行湿热处理，测试了丛生竹地板和毛竹地板湿热处理期间的含水率变化和尺寸稳定性。

The results showed that with the increase of grazing intensity, the annual (Salsola collina, Cleistogenes squarrosa, Artemisia frigida) replaced the perennial grasses, such as Stipa grandis, Leymus chinensis, the height of vegetative ...

从无放牧的对照样地到重度退化样地植物群落类型依次转变为：羊草+大针茅+丛生禾草、大针茅+羊草+糙隐子草+丛生禾草、糙隐子草+大针茅+羊草+丛生禾草、猪毛菜+糙隐子草+小丛生禾草。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。