北方地区光照强度对丽格海棠品质的影响   总被引：2，自引：0，他引：2  

翟瑜  蔺银鼎  米哲峰  康黎芳  曹冬梅 《山西农业科学》2008,36(8)

在盆栽条件下,研究了光照强度对丽格海棠生长发育过程中各个阶段叶绿素含量、可溶性糖含量、可溶性蛋白质含量及植物学性状的影响。结果表明:随着光照强度程度的加剧丽格海棠叶绿素含量呈下降趋势;可溶性糖含量、可溶性蛋白质含量在苗期和生长期均为5000～15000lx下最低,在开花期各处理间相差不大。光照强度对丽格海棠植物学性状的影响较为复杂。综合各项指标得出:丽格海棠苗期和生长期的最适合光强为5000～15000lx,开花期为5000lx以下。  相似文献   

A 10-year evaluation of the functional basis for regeneration habitat preference of trees in an African evergreen forest   总被引：2，自引：0，他引：2  

Colin A. Chapman  Kaoru Kitajima  Amy E. Zanne  Les S. Kaufman  Michael J. Lawes 《Forest Ecology and Management》2008,255(11):3790-3796

The spatial distribution of tree juveniles in relation to light environments may reflect species differences in growth, survival, and functional traits and will shape the nature of forest regeneration. Long-term field experiments are important to evaluate this issue because of the potentially very long juvenile period in trees. Here, we combine a 10-year seedling survival–growth data with the results of community ordination and multivariate analyses of functional traits to ask how observed juvenile light guilds are related to species functional traits and seedling performance. We transplanted seedlings at a standardized height of 11 cm into the shaded understory and quantified their growth and survival for 10-years. Using the community-wide stem distribution data, we categorized 33 species including the focal 11 species to understory vs. gap/edge guilds. Then, we determined differences between the two guilds in seedling survival, growth, as well as seed size, adult height, and a series of leaf traits, including toughness and chemical traits (fiber, protein, phenolics, tannins, alkaloids, saponins). Among the 11 non-pioneer species whose seedlings were planted into the understory, there was no significant difference in 10-year survival between light guilds, but species in gap/edge guild tended to achieve greater height than species in the understory guild. The leaf chemical traits of 33 species did not differ between the two juvenile light guilds, but gap/edge species had smaller seeds, taller adults, and tougher leaves than understory species. We used logistic regression as a complementary approach to assess the extent to which plant traits varied between light guilds and the most parsimonious model based on AIC_c ranking included only leaf toughness and had an Akaike weight of 0.52. In addition, across the 11 species planted as seedlings, these traits were not significantly related to survivorship or growth over 10 years. A Principle Components Analysis illustrated associations among traits. We conclude that light guilds in terms of juvenile stem distribution could not be explained by long-term field performance of post-establishment seedlings alone. Earlier seedling stage or later sapling stage may be more important in differentiation of light guilds. For the species examined difference in growth rates could be linked to seed size and adult stature, but not to the adult leaf chemical traits considered. These results suggest the importance of examining ontogenetic shifts and relationships among functional traits for a better understanding of regeneration strategies of tropical trees.  相似文献   

不同光强对辣椒果实中辣椒素及其竞争物质的影响     

高嵩  何莉莉  陈俊琴  高妍萍 《河南农业科学》2008,(4):83-86

在4种不同光照强度——40%,60%,80%自然光和对照自然光下,测定辣椒果肉和胎座中辣椒素含量及其合成竞争物质单宁、类黄酮、木质素含量。结果表明:随光强降低辣椒素含量降低,但自然光处理例外,80%自然光最有利于辣椒素的合成;类黄酮积累随光强降低而降低;木质素含量随光强增强而降低;单宁含量不受光照强度影响。  相似文献   

不同光照强度对玫瑰组织培养中初代培养物褐化的影响   总被引：13，自引：1，他引：12  

杨博  韩振海  张永  李天红 《中国农学通报》2003,19(6):194-194

玫瑰是一种重要的观赏植物,经济价值高,但玫瑰快繁体系尚未建立。本文研究了在不同田间光照强度下,玫瑰组培初代培养过程中培养物多酚氧化酶（PPO）活性、总酚含量、褐变百分数和萌芽成活率的变化规律。结果表明：遮荫处理使玫瑰培养物的褐变百分数降低而萌芽率显著提高;正常光照强度下多酚氧化酶活性与其他遮荫处理相比并无显著变化,但总酚含量显著高于遮荫处理,二者的相关分析表明多酚氧化酶活性与组织材料的总酚含量相关性不大。  相似文献   

弱混合动力柴油机起动工况仿真与试     

魏长河  王忠  王宇成  黄成海  唐廷 《农业机械学报》2010,41(4):6-11

针对采用ISG弱混合技术柴油机常温下的起动工况,通过分析控制策略,建立了柴油机的动态管理仿真模型和ISG电机电磁模型,对ISG电机拖动柴油机的起动过程进行了仿真,分析了起动过程中电机功率、转矩随柴油机转速的变化关系,并与柴油机起动台架试验进行对比分析.研究表明,采用ISG技术后,当蓄电池的电压为36～60V时,均可将柴油机拖至目标转速,满足起动要求.起动时,ISG电机各绕组平均起动转矩为87.4N·m,线电流在30～150A,输出功率呈先增后减的变化趋势,功率峰值为4.98kW.从静止到着火转速的仿真起动时间只需0.4s,试验结果为0.5s;从静止到怠速稳定的仿真时间仅为2.8s,试验结果为3.1s,试验与仿真结果吻合.  相似文献   

光质对小苍兰茎尖试管成球的影响     

车生泉  秦文英 《上海交通大学学报(农业科学版)》1998,(2)

以小苍兰茎尖为外植体,分别置于白光（400～690nm）、红光（590～690nm）、黄光（520～640nm）、蓝光（400～530nm）、绿光（500～590nm）和黑暗下培养,研究不同光质对小苍兰茎尖试管培养的根、芽分化和成球的影响。结果表明:红光下根平均的分化率和平均球茎数最高;蓝光下培养的球茎平均重量最大;白光下芽平均分化率最高,平均球茎数仅次于红光;绿光和黑暗对茎尖试管成球的分化与生长均有不利影响。  相似文献   

温度和光照条件对野生兰花开花习性的影响   总被引：2，自引：0，他引：2  

韩云花  李平英  师春娟  董菊兰  于永明  高淑琴 《甘肃农业科技》2009,(4):13-16

在不同温度和光照条件下．对野生春兰（Cymbidium goeringii）和蕙兰（Cymbidium faberi）的开花习性进行了研究。结果表明,在8～20℃条件下,2种野生兰花随温度的升高花芽（花葶、花苞）的生长相应地加快,且不同温度间差异显著;温度对花期的影响明显,随温度的升高,花期缩短,20℃时最为明显。光照对2种野生兰花花葶的生长影响较大,开花前春兰花葶的生长量自然光处理明显大于遮光处理,而开花后反之;与春兰不同的是蕙兰在较高温度下花葶的生长才有此特性。  相似文献   

Influence of light availability on growth, leaf morphology and plant architecture of beech ( Fagus sylvatica L.), maple ( Acer pseudoplatanus L.) and ash ( Fraxinus excelsior L.) saplings     

Any Mary Petri?an  Burghard von Lüpke  Ion Catalin Petri?an 《European Journal of Forest Research》2009,128(1):61-74

In a field study, we measured saplings of beech, ash and maple growing in a fairly even-aged mixed-species thicket established by natural regeneration beneath a patchy shelterwood canopy with 3–60% of above canopy radiation reaching the saplings. Under low light conditions, maple and ash showed a slight lead in recent annual length increment compared with beech. With increasing light, ash and maple constantly gained superiority in length increment, whereas beech approached an asymptotic value above 35% light. A suite of architectural and leaf morphological attributes indicated a more pronounced ability of beech to adapt to shade than ash and maple. Beech displayed its leaves along the entire tree height (with a concentration in the middle crown), yielding a higher live crown ratio than ash and maple. It allocated biomass preferentially to radial growth which resulted in low height to diameter ratios, and expressed marked plagiotropic growth in shade indicating a horizontal light-foraging strategy. In addition, beech exhibited the highest specific leaf area, a greater total leaf area per unit tree height, a slightly greater leaf area index, and a greater plasticity to light in total leaf area. Ash and maple presented a “gap species” growth strategy, characterized by a marked and constant response in growth rates to increasing light and an inability to strongly reduce their growth rates in deep shade. In shade, they showed some plasticity in displaying most of their leaf area at the top of the crown to minimize self-shading and to enhance light interception. Through this, particularly, maple developed an “umbrella” like crown. These species-specific responses may be used for controlling the development of mixed-species regeneration in shelterwood systems.  相似文献   

共培养系统中4种微藻生态因子的研究   总被引：1，自引：0，他引：1       下载免费PDF全文

文国樑  梁伟峰  李卓佳  曹煜成  陈素文 《渔业科学进展》2009,30(6):142-148

通过二次回归通用旋转组合设计安排实验,研究光强、温度和盐度对分离自对虾池塘水环境中的啮蚀隐藻、新月菱形藻、微绿球藻和蛋白核小球藻的增长率的影响。获得各微藻的最适生态因子及其影响度。啮蚀隐藻的最适生态因子为：光强5750～7944lX,温度21．3～28．3℃,盐度13．3～23．0;影响度依次为：盐度〉温度〉光强。新月菱形藻的最适生态因子为：光强5761～86971X,温度23．4～29．6℃,盐度11．9～25．7;影响度依次为：盐度〉光强〉温度。蛋白核小球藻的最适生态因子为：光强6754～8775iX,温度17．1～20．7℃,盐度19．6～26．4;影响度依次为：温度〉盐度〉光强。微绿球藻的最适生态因子为：光强7128～9012lX,温度18．7～26．7℃,盐度17．9～24．3;影响度为光强〉温度〉盐度。啮蚀隐藻和新月菱形藻的增长率受到以盐度为基础、以光强和温度为协同因子的显著影响。  相似文献   

水稻卷叶性状生理生态效应的研究 Ⅰ.叶片姿态、群体构成及光分布特征   总被引：15，自引：0，他引：15  

郎有忠  张祖建  顾兴友  杨建昌  朱庆森 《作物学报》2004,30(8):806-810

以珍汕97B为遗传背景的两个卷叶近等基因系分别与明恢63所配叶片为半卷及平展的杂交组合为材料,进行栽培密度试验,对其叶片姿态及群体结构进行分析。结果表明,卷叶性状可显著降低叶片的披垂程度,减少叶片投影面积,增加群体上层叶面积的比例,改善群体内部透光状况。并且使群体叶面积系数偏小,卷叶群体成穗数偏少,但通  相似文献