针叶树种计算机视觉苗木自动分级系统的研究   总被引：7，自引：0，他引：7  

吴羡  白景峰 《东北林业大学学报》1998,26(4):32-35

针对苗木分级领域的实际需要及国际苗木分级技术发展状况,研究,设计了针叶树种计算机视突苗木自动分级系统。该系统应用计算机视觉技术和神经网络技术。通过对苗木图像的处理。在实验室中实现对苗木的自动分级,实验研究表明,计算机视觉自动分级系统在苗木分级领域中具有良好的应用前景。  相似文献   

水稻热激反应的研究 Ⅱ.高温对晚稻幼苗叶片叶绿体的Hill反应及超微结构的影响   总被引：1，自引：0，他引：1  

郑小林  董任瑞 《湖南农业大学学报(自然科学版)》1998,(5)

以两个不同抗热性晚稻品种为材料,研究了热激对幼苗叶片叶绿素含量、叶绿体的Ｈｉｌ反应及超微结构的影响．结果表明：（１）热激时间延长,叶绿素含量降低的幅度不明显,叶绿体结构的热稳定性反映出水稻品种的抗热性．（２）热激后叶绿体Ｈｉｌ反应快速下降,叶绿体超微结构受到影响,并表现出基因型差异．Ｈｉｌ反应可望作为水稻抗热性的鉴定指标．  相似文献   

水稻热激反应的研究：Ⅲ.高温对水稻幼苗叶片过氧化物酶的影响   总被引：6，自引：0，他引：6  

郑小林  董任瑞 《湖南农业大学学报(自然科学版)》1998,24(6):423-435

为探讨过氧化物酶（ＰＯＤ）与水稻抗热性之间的关系,对水稻６个品种进行热激处理后,测定幼苗叶片的ＰＯＤ活性和丙二醛（ＭＤＡ）含量。结果表明,高温胁迫下,水稻幼苗叶片的ＰＯＤ活性升高,但是其同工酶谱没有变化。ＰＯＤ活性增加的趋势与ＭＤＡ含量增加的趋势呈负相关,表明高温胁迫下ＰＯＤ活性升高能提高水稻幼苗抗膜脂过氧化的能力,是对高温胁迫的一种适应性生理反应。  相似文献   

梯度磁场对水稻幼苗生理生化影响的研究   总被引：1，自引：0，他引：1  

彭运生 《中国农业大学学报》1998,3(1):95-98

本文用梯度磁场处理旱稻２号,中百４号,旱梗子和秋光四个品种的水稻种子,结果表明,处理后的叶绿素,脯氨酸和蛋白质含量增加,ＳＯＤ活性升高,膜透性降低。ＰＯＤ活性下降,根,苗高于对照。  相似文献   

江苏省旱育秧及抛栽稻田病虫演变规律和防治策略研究     

肖英方  陈明亮 《西南大学学报(自然科学版)》1998,20(5):551-556

对江苏省旱育秧和抛栽田病虫演变特征及防治对策研究表明,旱秧田主要地下害虫为蝼蛄、蚯蚓。恶苗病、苗稻瘟发病率分别是水秧田的０．９１～２．１５倍和５倍,青枯和立枯病明显上升,而１代螟虫产卵量、螟害率明显轻于水秧田。抛秧田发生病虫种类相同,但纹枯病、螟虫、卷叶螟发生明显重于常规栽插田,稻飞虱发生轻于常规手栽田。  相似文献   

苏铁正常绿苗与白化苗若干生理生化指标的差异   总被引：4，自引：1，他引：3  

傅瑞树 《福建林学院学报》1998,18(3):270-272

苏铁正常绿苗种子粒重、株鲜重、株高、可溶性蛋白质、淀粉酶活性、超氧物歧化酶（ＳＯＤ）活性、色氨酸含量均高于白化苗;而吲哚乙酸氧化酶活性、丙二醛（ＭＤＡ）含量明显低于白化苗．  相似文献   

几种保苗剂防治棉蚜效果及其对棉花出苗保苗综合效应的研究     

凌冰  孙新华 《新疆农业大学学报》1998,21(4):262-266

在防治棉蚜的田间小区试验中,保苗剂９号和１号处理棉种（药剂∶种子＝１∶５０,下同）防治效果最好,维持８９．１％以上的防效达３０ｄ;其次为保苗剂８号,３０ｄ平均防效为７７．９％;保苗剂２号对棉蚜无效。４种保苗剂处理棉种对棉花安全,其出苗率和保苗效果均显著高于对照。温室外试验结果表明：不同温度和湿度对包衣棉种出苗率和保苗效果的影响很大。不同温度条件下,土壤湿度在１９．８４％～１９．９６％时的出苗率远远低于对照;平均温度为１３．３℃,土壤湿度为２７．５６％时,经种衣剂２４号处理的棉种的出苗率、保苗效果最好;土壤湿度为２４．６５％时,保苗剂９号处理的出苗率保苗效果较好。平均温度为２１．２℃,土壤湿度为２２．７５％时,种衣剂２４号和保苗剂９号处理的出苗率较高,保苗效果是对照的１．０６～１．１６倍。另外,还采用了新的统计方法来评价持效期较长的保苗剂的防虫效果  相似文献   

香榧苗木繁育方法研究进展     

李婷  廖文婷  任少华  张驰强  周鑫伟 《现代农业科技》2019,(22)

为了更好地研究香榧繁育技术,对香榧苗木繁育方法及容器苗培育技术的研究进展进行了综述。香榧的苗木繁育方法有播种、嫁接、扦插以及组织培养,目前生产实际中最常用的方法为嫁接。  相似文献   

A rapid reliable test for screening aryloxyphenoxy- propionic acid resistance within Alopecurus myosuroides and Lolium spp. populations     

LETOUZÉ  & GASQUEZ 《Weed Research》1999,39(1):37-48

A reliable seedling bioassay was developed and tested for the rapid screening for resistance to aryloxyphenoxypropionic (APP) herbicides in Alopecurus myosuroides and Lolium spp. populations. It is based upon the difference in coleoptile length of resistant and susceptible A. myosuroides and Lolium seedlings, respectively, exposed to fenoxaprop-P acid and diclofop acid solution for 6 days in a plastic box. A 6 mg L⁻¹ fenoxaprop-P acid solution was selected as the best concentration for a reliable screening of resistant biotypes within A. myosuroides populations. At this concentration, coleoptile lengths of susceptible and resistant seedlings were shorter and longer than 10 mm respectively. Similarly, resistant seedlings within Lolium populations were easily detected at 10 mg L⁻¹ diclofop acid. At this concentration, coleoptile lengths of susceptible and resistant seedlings were shorter and longer than 20 mm respectively. For both populations, the coleoptile length distributions appear to discriminate between two kinds of APP-resistant biotypes (highly and slightly resistant).  相似文献   

The Relationship Between Wheat Seed Weight, Infection by Fusarium culmorum or Microdochium nivale, Germination and Seedling Disease     

M.C. Hare  D.W. Parry  M.D. Baker 《European journal of plant pathology / European Foundation for Plant Pathology》1999,105(9):859-866

The distribution of seeds by weight for three lots of winter wheat cv. Avalon infected by Fusarium culmorum and three lots of winter wheat cv. Riband infected by Microdochium nivale was determined. The distribution of infected seeds within each seed lot was then determined by isolating F. culmorum from seeds on moist filter paper and M. nivale from seeds on potato dextrose agar. The distribution of M. nivale infected seeds between seeds of different weight was similar to that of the seed lot as a whole, whereas the distribution of F. culmorum was greater in light seeds than heavy seeds. The percentage germination of infected seeds decreased with seed weight. A similar situation was found with respect to seedling emergence in compost for F. culmorum infected seeds. However, with M. nivale infection, similar numbers of seedlings emerged from both light and heavy infected seeds. Seed treatment with guazatine increased seedling emergence for both light and heavy seed infected by M. nivale. However, seedling emergence from F. culmorum infected seed was poor even following treatment with guazatine. Poor emergence was most evident from light seed.  相似文献