杨树新品系苗期抗性指标测试

杨树苗期抗性性状测试是良种选育中的一个重要指标,也是抗性育种多性状选择的重要环节,它关系到选育的成功与否。本文采用测试品系15个,即分别为J、B、A、LB、IC、50、52、53、54、01、5、中S、中H、中M号杨,分别在黑龙江省牡丹江市的北安乡丰收村、绥阳林业局二道岗子林场、海林市旧街乡杨林村、迎春林业局科研所苗圃等4个地点进行杨树苗期抗性性状测试,以小黑杨为对照种。综合不同苗龄型测试结果,抗寒能力较强的品系为5、J、B号杨等9个,冻害指数均为0;抗黑斑病能力较强的品系为J、LB、54、中M、B号杨;抗锈病能力较强的品系为54、50、LB、5、53号杨;不同地点抗病性状比较,黑斑病与锈病发病程度为丰收>迎春>二道岗子。     

晚熟中华猕猴桃新品种-皖金的选育

皖金是安徽农业大学园艺学院与皖西猕猴桃研究所,通过实生选种选育的优良中华猕猴桃新品种.果实卵圆形,果肉黄色,果面茸毛短而少,平均单果质量133 g,可溶性固形物含量12.5%,可滴定酸为0.88%,维生素C含量759.0mg·kg-1.果实生育期180d左右,在安徽霍邱,果实成熟期11月1-3日.果实耐贮藏.该品种抗逆...     

宁夏地区白蜡育苗及造林技术规程

本标准主要规定了宁夏地区白蜡播种育苗、移植、出圃和造林等各项技术环节,以指导生产实践,促进白蜡生产中先进技术的推广应用,提高白蜡苗木质量和造林质量。     

光环境调控技术在蔬菜工厂化育苗中的应用及前景

幼苗的健壮程度直接影响定植后蔬菜植株的生长发育,并与蔬菜的产量和品质密切相关。研究开发安全环保、经济有效的育苗技术是现代设施农业发展所面临的重要课题,而通过光环境调控技术培育壮苗是一项节能环保、经济有效且简便易行的新方法,具有突出优势。本文从光强、光质和光周期3 个
方面总结了光环境调控技术在蔬菜育苗中的研究进展及应用,并对LED 光源在蔬菜工厂化育苗中的应用前景进行了展望。     

云南甘薯抗旱育苗技术研究

采取不同的甘薯抗旱育苗措施,对其萌芽出苗、地上部性状等方面进行比较分析。分析结果表明,覆膜覆土、覆盖稻草、覆盖遮阳网能有效减少土壤水分蒸发,增加土壤含水量,有利于甘薯早出苗,具有一定的抗旱作用;盖遮阳网后植株长势弱、易发生徒长;增施有机肥育苗植株长势好,但抗旱效果不明显。     

THE AERIAL PHOTOGRAPH IN FORESTRY

This paper presents a review of the literature on aerial photography with particular reference to its application in forestry. After some introductory remarks on the history of aerial photography, the author describes the photographic materials and equipment used for various purposes. The principle of stereoscopic vision is explained and the fundamentals of mapping techniques based upon photogrammetric procedures are briefly reviewed.

The importance of aerial photographs for reconnaissance of undeveloped forests is emphasized. The distinction between the direct and indirect methods of estimation of stand volume from aerial photographs is discussed. Further applications of aerial photographs in forest management and forest engineering are outlined. The potential use of aerial photographs in South African forestry is stressed.     

黄菠萝不同密度播种育苗研究

[目的]研究不同密度育苗对黄菠萝生长的影响,为黄菠萝优质苗木的规模化生产提供科学的依据.[方法]采用不同规格的容器进行黄菠萝苗木培育,定期观测黄菠萝苗木生长,苗木停止生长后,测定苗木地上部分和地下部分生长量,确定黄菠萝最佳的育苗密度.[结果]不同密度对黄菠萝苗木生长进程有一定影响,对黄菠萝苗木地上部分和地下部分生长影响也很显著,黄菠萝最佳育苗密度为200株/m2.[结论]为了培育大量优质壮苗,提高经济效益,应合理控制育苗密度.苗木密度适宜时,苗干粗壮,根系发达,高径比值较小,合格苗木数量多,抗逆能力较强;密度过小,不但不能充分利用土地,而且苗木质量也不一定高.     

59份苜蓿种质材料苗期耐盐性评价及耐盐指标筛选

为了解不同苜蓿种质材料耐盐程度和筛选苜蓿苗期耐盐性评价指标,本研究采用盆栽法对59份苜蓿种质材料苗期进行200 mmol·L^-1 NaCl盐溶液胁迫处理,测定了与苜蓿耐盐性相关的12个生长指标和叶绿素荧光指标,并利用综合评价、相关性分析、灰色关联和聚类分析等方法对其苗期耐盐性进行评价及耐盐指标筛选。结果表明：地上生物量、地下生物量、根冠比、叶面积、叶长、茎粗、叶宽、株高和SPAD（Soil and plant analyzer develotrnent,SPAD,代表相对叶绿素含量）在不同种质材料间变异大,对盐胁迫反应敏感。用加权隶属函数法得到的耐盐性综合度量值（D值）对59份苜蓿材料苗期的耐盐性进行综合评价,基于D值进行聚类分析,可将59份材料划分为5类：第I类有16份种质材料,D值为0.384,属中等耐盐材料;第II类有13份种质材料,D值为0.465,属强耐盐材料;第III类有4份种质材料,D值为0.647,属极强耐盐材料;第IV类有8份种质材料,D值为0.229,属极弱耐盐材料;第V类有18份种质材料,D值为0.305,属弱耐盐材料。综合筛选出耐盐性极强的材料有‘美11’、‘中苜1号’、‘爱开夏’和‘中苜3号’,耐盐性极弱的材料有‘北方SLT’、‘康赛’、‘WL903’、‘WL440HQ’、‘杂6’、‘Natawwakaba’、‘罗默’和‘甘农3号’。通过相关性分析和灰色关联,筛选出叶面积、叶绿素荧光、SPAD和根冠比可作为苜蓿苗期耐盐性鉴定指标。本研究可为耐盐苜蓿新品种选育及利用提供理论依据。     

The effect of a mixture of seed-borne Microdochium nivale var. majus and Microdochium nivale var. nivale infection on Fusarium seedling blight severity and subsequent stem colonisation and growth of winter wheat in pot experiments

Greenhouse experiments were conducted in order to determine the impact of seed-borne Microdochium nivale var. nivale and var. majus inoculum, and seed treatment with a carboxin+thiram mixture, on the development of seedling blight, and on subsequent stem colonisation and growth of winter wheat (cv. Cadenza). Experiments were conducted at temperatures favourable (3°C) and unfavourable (22°C) to M. nivale. Seed-borne inoculum resulted in seedling blight symptom development when plants were grown at 3°C, but not when plants were grown at 22°C. For seedlings grown at 3°C, plants arising from heavily blighted seedlings developed more severe symptoms of stem colonisation, when compared with those arising from seedlings from carboxin+thiram treated seeds. In addition, the vigour of such plants (assessed by determining the number of tillers and ears per plant, stem length, green leaf area, dry weight and yield) was also significantly lower than for plants arising from carboxin+thiram treated seeds. Microdochium nivale var. majus and var. nivale appeared to have little effect on plant vigour from seedlings grown at 22°C. This is the first recorded incidence of seedling blight affecting subsequent plant growth. Microdochium nivale var. majus and var. nivale stem colonisation increased from growth stage (GS) 40–49 to harvest in plants raised from seedlings grown at both temperatures. Microdochium nivale var. majus and var. nivale were isolated from the second node at GS 40–49 and the third node at harvest of plants from seedlings grown at 3°C. For plants from seedlings raised at 22°C, M. nivale var. majus and var. nivale were isolated from the first node at GS 40–49 and the second node at harvest. Carboxin+thiram seed treatment decreased the extent and severity of stem colonisation on plants from seedlings grown at 22°C.     

白楠育苗试验初报

对白楠种子的采集、处理、种子千粒重、发芽率、育苗方法和苗期节律生长等进行了观测和试验。