2006年小麦小区高产栽培技术总结     

郑艳玲  李冕 《现代化农业》2007,(4):10-11

2006年，黑龙江北大荒农业股份有限公司七星研发中心按照黑龙江省农垦总局建三江分局和七星分公司关于开展五大作物小区高产攻关的具体要求和部署，实施了小麦小区高产栽培试验。2006年的气候条件比较有利于小麦的生长发育，小区实收公顷产量达6750kg，与目标公顷产量7500kg相差750kg。总结经验、寻找差距，为进一步提高产量，攻克目标做科学的理论指导。  相似文献   

黄土高原可持续发展评价指标体系设计与应用   总被引：3，自引：0，他引：3  

崔灵周  李占斌  马俊杰 《西北农林科技大学学报(自然科学版)》2001,29(2):86-90

通过对黄土高原可持续发展评价指标体系和方法的初步研究 ,设计出了包括 1个高级综合指标——可持续发展综合指数、人口状况等 5个基本指标和人口自然增长率等 30个元素指标的层次性指标体系结构框架 ,熵技术支持下确定可持续发展指标权重的层次分析法 ,以及由递阶多层次综合评价、主成份分析和回归分析等数学方法所集成的可持续发展全面综合评价模型 ,并以陕北黄土高原为例进行了具体的应用分析与评价  相似文献   

地形测针板在坡面土壤侵蚀研究中的应用   总被引：4，自引：0，他引：4  

丁文峰  张平仓  李勉 《中国水土保持》2006,(1):49-51

采用放水冲刷法,通过5.2、7.2 L/m in两个不同的放水流量,在4 m长坡面(坡度20°)和3 m长沟坡(坡度50°)组成的坡沟系统土槽上进行了冲刷试验,用地形测针板法和坡面侵蚀沟测量法对坡沟系统的侵蚀产沙状况进行了对比研究。结果表明:采用地形测针板法不仅能测量计算坡面的土壤侵蚀量,而且能与W indows Surfer结合给出坡面侵蚀前后的三维立体图,较为直观地反映了坡面各不同空间部位的侵蚀量大小,且测量精度较传统的侵蚀沟测量法提高6~7个百分点。地形测针板法操作简便、易于掌握,是一种可靠的研究坡面土壤侵蚀空间分布的有效方法。  相似文献   

小流域地貌部位和土地利用类型对侵蚀产沙影响的137Cs法研究   总被引：1，自引：2，他引：1  

侯建才  李占斌  李勉  王民 《水土保持学报》2007,21(2):36-39

大气核爆产物137Cs能够强烈地被土壤颗粒所吸附,是一种示踪土壤运移的良好示踪剂。通过对紫色丘陵区响水滩小流域不同地貌部位和不同土地利用类型下土壤剖面中137Cs含量的测定与分析,计算了流域各地貌部位、土地利用类型的侵蚀强度。研究得出该流域137Cs含量的背景值是1870 Bq/m2;流域内坡耕地、林地的年均侵蚀强度分别是4468 t/(km2.a)和1759 t/(km2.a);丘顶、丘坡和鞍部的年平均侵蚀强度分别是2125,4676 t/(km2.a)和3625 t/(km2.a),槽土和水田则是沉积区。分析结果表明地貌部位和土地利用类型对土壤侵蚀影响巨大,坡耕地是该小流域泥沙的主要来源。  相似文献   

Identification of male sterility maintainer lines for Ogura radish (Raphanus sativus L.)     

M.S.H. Hawlader  M.A.K. Mian  M. Ali 《Euphytica》1997,96(2):297-300

‘Ogura radish’, a cytoplasmic genetic male sterile line, was crossed with four local and three Japanese cultivars to identify maintainer lines. Out of seven F₁ families, one cross involving a local cultivar, Aushi, produced 100% male sterile (MS) progeny. The crosses involving the other two local cultivars, Tangail Local and Kuni, produced about 90% MS progeny, indicating the presence of maintainer gene(s) for male sterility. The fourth local cultivar, Tasaki, produced 100% male fertile (MF) progeny. All three exotic cultivars appeared to possess the chromosomal gene(s) for controlling the male sterility. In BC₁, BC₂ and BC₃ generations, segregation of MS plants were more frequent when ‘Aushi’ was used as recurrent parent. The expression of male sterility was not affected by seasonal influences. Thus the local cultivar ‘Aushi’ may be used as maintainer line for ‘Ogura radish’. To produce hybrid seed, ‘Tasaki’ can be used as pollinator line as it exhibit high heterosis with ‘Aushi’. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

SNP markers linked to QTL conditioning plant height,lodging, and maturity in soybean     

Sungwoo Lee  T. H. Jun  Andrew P. Michel  M. A. Rouf Mian 《Euphytica》2015,203(3):521-532

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白狐源星状病毒RdRp基因的鉴定及遗传演化分析     

冀锦朝  黄勉  卢刚  欧嘉俊  彭仕明  萨家祺  李守军 《华南农业大学学报》2021,42(1):12-16

目的 探究广州动物园一例死亡白狐Alopex lagopus肾脏中鉴定出的星状病毒的遗传变异情况。方法 对死亡白狐进行剖检,利用半巢式RT-PCR对内脏器官进行病原学检测,对扩增出的病毒株的RdRp基因序列进行相似性分析。结果 死亡白狐的肾脏苍白肿大,被膜难以剥离,肾脏中检测出的星状病毒RdRp基因呈阳性。RdRp基因与9株参考毒株的核苷酸相似性为67.5%～96.2%,其中与香港猫源星状病毒1637F的核苷酸相似性(96.2%)最高。结论 本研究为星状病毒在野生哺乳动物间的跨种传播及肠外器官中的感染提供了依据。  相似文献   

野生山楂种子休眠特性及破除方法探讨     

苗卫东  扈惠灵  周瑞金  宋建伟  李勉 《北方园艺》2011,(7):27-29

以不同类型野生山楂种子为试材,观察了冷藏、常温处理对野生山楂种子萌发情况的影响,以期探讨山楂种子休眠的原因,寻找破除种子休眠的处理方法。结果表明:山楂种子的休眠性与种子种仁无关,与种壳有关,浓硫酸处理山楂休眠种子的最佳时间为50 min。  相似文献   

High genetic diversity in the endangered and narrowly distributed amphibian species Leptobrachium leishanense          下载免费PDF全文

Wei ZHANG  Zhenhua LUO  Mian ZHAO  Hua WU 《Integrative zoology》2015,10(5):465-481

Threatened species typically have a small or declining population size, which make them highly susceptible to loss of genetic diversity through genetic drift and inbreeding. Genetic diversity determines the evolutionary potential of a species; therefore, maintaining the genetic diversity of threatened species is essential for their conservation. In this study, we assessed the genetic diversity of the adaptive major histocompatibility complex (MHC) genes in an endangered and narrowly distributed amphibian species, Leptobrachium leishanense in Southwest China. We compared the genetic variation of MHC class I genes with that observed in neutral markers (5 microsatellite loci and cytochrome b gene) to elucidate the relative roles of genetic drift and natural selection in shaping the current MHC polymorphism in this species. We found a high level of genetic diversity in this population at both MHC and neutral markers compared with other threatened amphibian species. Historical positive selection was evident in the MHC class I genes. The higher allelic richness in MHC markers compared with that of microsatellite loci suggests that selection rather than genetic drift plays a prominent role in shaping the MHC variation pattern, as drift can affect all the genome in a similar way but selection directly targets MHC genes. Although demographic analysis revealed no recent bottleneck events in L. leishanense, additional population decline will accelerate the dangerous status for this species. We suggest that the conservation management of L. leishanense should concentrate on maximizing the retention of genetic diversity through preventing their continuous population decline. Protecting their living habitats and forbidding illegal hunting are the most important measures for conservation of L. leishanense.  相似文献   

花生AhMAPK14基因的克隆及表达分析研究     

朱立飞  张初署  唐月异  陈娜  潘丽娟  迟晓元  张建成  王通  王冕 《花生学报》2022,51(1):1-8,16

环境胁迫严重影响花生的产量和品质.筛选并研究花生中胁迫响应相关基因,对深入解析花生响应胁迫的分子机理具有重要意义.本研究从花生果腐病转录组文库中筛选并克隆得到花生基因AhMAPK14,对其进行了生物信息学分析及亚细胞定位,并利用qRT-PCR技术分析了其组织表达特异性及在不同处理下的表达模式.结果表明,AhMAPK14...  相似文献