共查询到18条相似文献，搜索用时 546 毫秒
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为得到一种快速且准确测定蔬菜幼苗叶面积的方法,以番茄幼苗为试材,以方格法为对照,研究扫描分析法、叶面积仪法、打孔称重法测定叶面积的准确性、精确性与测定速度,然后采用黄瓜、辣椒叶片及纸片的面积对测定结果进行验证,最后基于不同扫描分辨率对筛选出的方法进行优化。结果表明,相比叶面积仪法和打孔称重法,扫描分析法测定结果更接近真实值,且精度更高,用时更短。扫描分析法不同分辨率下测定结果无显著差异,且扫描分辨率越低所需测定时间越短。扫描分辨率50 dpi下的扫描分析法可作为一种快速准确测定蔬菜幼苗叶面积的方法。 相似文献
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回归方程法测定地果单叶面积研究 总被引：3，自引：0，他引：3
在利用扫描仅和photoshop获取标准面积纸片象素的基础上,确定在扫描仪分辨率为300 dpi、文件存贮格式为JPG、用photoshop显示照片的缩放比例为50%时,1 dpi=1/3600cm2.利用上述结论,对20个样地的200片地果(Rcus tikoua Bur)单叶分别测定了叶长L、叶宽W和叶面积A,并对Ficus tikoua Bur的单叶长L、宽W、叶长与其面积A之间的相关关系进行了分析.结果表明:椭圆形叶的单叶面积A与叶片长、叶片W呈极为显著的正相关关系,回归方程为方程:A=1.358L 5.156W-10.72,R2=0.944.这个方程对于野外测量地果种群的叶片总面积、估算地果的叶面积指数(LAI)具有实际价值. 相似文献
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叶面积大小是决定植物光合作用产物量的重要因素。为了得到一种快速、准确、灵活测定蔬菜叶面积的方法，本试
验以叶用莴苣为例，运用Image J 图像处理软件进行植株叶面积的测定，然后与传统测定方法方格计数法与纸样称重法的测
定结果进行比较验证。结果表明：方格计数法、纸样称重法与Image J 图像处理3 种方法测定结果之间不存在显著性差异；
通过方程线性回归分析发现，3 种方法之间的相关系数均在0.99 以上。由此可见Image J 图像处理软件可准确地应用于叶用
莴苣叶面积测定。 相似文献
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基于Matlab解析数字图像求解苹果叶面积的方法 总被引：1，自引：0，他引：1
为了快速测定苹果叶面积,以Matlab软件为工具对数字图像进行解析求解叶面积,解析结果通过与叶面积仪、剪纸法测定结果进行对比,分析基于Matlab解析数字图像求解苹果叶面积的准确性。结果表明:基于Matlab解析数字图像的方法与叶面积仪测定苹果叶面积的结果无显著差异(配对检验P(P|t|=0.1670.05)),剪纸法测定结果较低于Matlab解析法测定结果;该研究结果表明,基于Matlab解析数字图像求解苹果叶面积的方法经济、准确且快速,可作为一种新的测定苹果叶面积的方法进行推广应用。 相似文献
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氮肥对番茄营养功能特征及果实产量的影响 总被引：1，自引：0，他引：1
以番茄为试材,研究不同施氮水平对番茄营养功能特征及果实产量的影响。结果表明:与无氮区相比,各施氮处理均程度不同地提高了番茄的植株高度、比叶面积和果实产量,氮肥梯度与番茄的株高、比叶面积和果实产量呈正相关关系,与叶干物质含量和单位叶面积根量呈负相关关系,而与相对生长率无显著相关性,施氮强度达到一定肥效阈值后,番茄果实产量提高率下降,产量提高不明显。番茄果实产量与株高、相对生长率和比叶面积呈显著线性正相关关系,与叶干物质含量呈显著负相关关系(P0.05),与单位叶面积根量则无显著相关性(P0.05)。结果表明,适量施氮可促进番茄根叶等营养器官发育,但过量施氮,导致番茄营养生长过盛,抑制了生殖生长,从而导致肥效对番茄果实产量提高作用下降。因此,在番茄生产和管理中,对于番茄幼苗管理,可适当增施氮肥,有助于植物体快速生长和发育,但对于盛果期番茄,应适量施氮,以免肥料浪费和果实产量受到负面影响。 相似文献
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不同施磷量对设施番茄生长、产量的影响及最佳施用量研究 总被引：1，自引：0，他引：1
通过田间试验研究了二代日光节能温室不同施磷量对番茄生长、产量及其经济效益的影响。结果表明,幼苗期,磷肥施用量显著促进茎粗和叶面积的增加;而花期叶面积和冠幅差异不显著。随着施磷量的增加,番茄株高、茎粗、叶绿素均比对照显著增加,但处理间差异不显著。随着番茄植株的生长,至花期营养生长与生殖生长并进,不同施肥处理中番茄株高、茎粗、冠幅、叶绿素均显著增加。番茄产量的磷效应表现为典型的抛物线式,施磷量低于225kg/hm2时,随施磷量的增加,番茄产量增加;但进一步增加施磷量则会导致产量下降,从而得到其最高产量施磷量为253.90kg/hm2,最大经济效益施磷量为250.80kg/hm2。 相似文献
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The influence of wood fiber substrates (WFS) and their volume weights (VW) on the growth of tomato transplants (Lycopersicon lycopersicum (L.) Karst. ex Farw.) were examined. No significant differences were observed for the absolute and relative growth rate of tomato transplants cultivated in WFS as compared to white peat (WP). Particularly in WFS plants showed a well developed root system. When the tomato transplants were cultivated in spring increases of VW led to a reduction of root growth, but no significant differences were observed for other plant parameters. In summer differences between weakly and strongly compacted substrate treatments for fresh mass of leaf and stem for both WFS were found. The coarse WFS also showed a significant difference in leaf area for these two treatments. Weakly compressed substrate had a faster decrease of matric potential in summer.WFS are suitable for cultivation of vegetable transplants and are a good alternative for peat-based substrates. When filling containers, moderate compression of WFS is recommended. 相似文献
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不同光周期下黄瓜和番茄幼苗生长与ZT和IAA的相关性 总被引：5，自引：0，他引：5
研究不同光周期（12、14、16、18 和20 h · d-1）对黄瓜和番茄幼苗生长的影响,探讨不同
光周期下幼苗生长与ZT 和IAA 含量的关系。结果表明：随着光周期的延长,黄瓜和番茄幼苗株高有降
低趋势,番茄幼苗的可溶性蛋白和可溶性糖含量逐渐升高;光周期达到16 h · d-1 时,叶面积达到最大值,
壮苗指数显著高于12 和14 h · d-1 处理;随着光周期的延长,番茄叶片中ZT 和IAA 含量逐渐升高,茎中
逐渐降低,且与番茄叶面积和株高成线性回归相关,黄瓜幼苗株高与茎中IAA 含量、根鲜质量与根中ZT
含量成正线性回归相关。总体而言,光周期设置在16 h · d-1 时有利于促进黄瓜和番茄幼苗的生长,培育
壮苗。推测光周期通过调控黄瓜和番茄幼苗ZT 和IAA 含量的变化来影响其生长发育。 相似文献
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The ability of vegetation to capture and retain atmospheric Particulate Matter (PM) is directly dependent on the interactions between PM and plant surfaces. However, the impact of individual leaf traits in this respect is still under debate due to variations in published findings. This study employed standardised experimental designs with natural and synthetic leaves in three experiments to explore the impact of individual leaf traits on traffic-generated PM accumulation whilst other influential variables were controlled. The impact of leaf size on PM deposition was explored using synthetic leaves of different sizes (small, medium and large) but with the same shape and surface characteristics (n = 20 for each category). The impact of leaf shape was examined using another set of synthetic leaves of different shape (elliptical, palmately-lobed and linear) but with the same surface area and the same surface characteristics (n = 20 for each category). PM accumulation (PM1, PM2.5 and PM10) on these leaves was quantified using an Environmental Scanning Electron Microscope (ESEM) and ImageJ software. Any differences in PM capture levels due to leaf size and leaf shape were identified using one-way Anova and Tukey’s pairwise comparison. In a subsequent experiment, equal-sized, square-shaped leaf sections obtained from four plant species (n = 20 for each species) with different micromorphology were exposed to traffic-generated pollution and any PM capture differences due to leaf micromorphology identified employing the same SEM/ImageJ and statistical approach. The results of all three experiments showed significant differences in PM accumulation between different leaf sizes (p < 0.001), between different leaf shapes (p < 0.001) and between different leaf micromorphology (p < 0.001) suggesting that all these characters are influential in the capture and retention of PM on leaves. Smaller leaves and complex leaf shapes (lobed leaves) showed a greater potential to capture and retain PM. Leaf surfaces with hair/trichomes, epicuticular wax, and surface-ridges accumulated more PM compared to smooth surfaces; of these characters, leaf hairiness/presence of trichomes was found to be the most important. Species sharing most of these important leaf traits are recommended as effective PM filters. 相似文献
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以15℃夜温为对照,研究了6℃夜间低温对番茄叶片气孔开张度日变化及叶片结构的影响。结果表明:处理7d时,处理植株叶片气孔器大小和叶面积显著小于对照,气孔密度显著大于对照。表皮厚度极显著大于对照。叶片厚度大于对照,但与对照差异不显著。处理植株番茄叶片气孔张开程度一天中皆小于对照,气孔张开率上午与对照差异不显著,14:00显著小于对照。16:00极显著小于对照;恢复7d时,夜低温处理番茄叶片气孔器显著大于对照。气孔密度、每叶气孔数及单叶叶面积、气孔张开率皆小于对照,叶片气孔开口程度、叶片表皮厚度及厚度大于对照,但差异都不显著;夜间低温处理后叶片栅栏组织显得更紧密,恢复7d后无显著差异。 相似文献