江汉平原杨树人工林的施肥方式   总被引：5，自引：0，他引：5  

罗治建  陈卫文  鲁剑巍  Yu Changbing  Chen Fang 《东北林业大学学报》2005,33(4):98-99

对江汉平原新造杨树人工林进行了连续3a的施肥方式研究。试验共设不施肥,3月份一次四点穴施,6月份一次四点穴施,3、6月份各半四点穴施(深25cm),3、6、8月份各1／3四点穴施,3、6月份各半圈施,3、6月份各半四点穴施(深50cm)等7个处理。试验结束时调查各处理杨树株高、胸径,并计算材积量。结果表明：每年6月一次四点穴施对杨树树高、胸径和材积生长的促进作用最明显,其它方式效果一般,而3月份一次性施肥效果最差,且与不施肥间无明显差异。  相似文献   

Experimental transmission of an unnamed bovine Babesia by Hyalomma spp., Haemaphysalis longicornis and Boophilus microplus     

Luo J  Chen F  Lu W  Guan G  Ma M  Yin H 《Veterinary parasitology》2003,116(2):115-124

Experiments were undertaken to determine the mode of transmission to cattle of an unnamed Babesia sp. by Hyalomma anatolicum anatolicum, Hyalomma detritum, Hy. rufipes koch, Haemaphysalis longicornis and Boophilus microplus. The unnamed Babesia species designated Babesia U sp. was isolated by infesting cattle with nymphs from female Hy. a. anatolicum ticks collected from Xinjiang province. Adults of laboratory reared Hy. a. anatolicum, Hy. detritum and Hy. rufipes koch were infected with Babesia U sp. by feeding on infected cattle, isolated with nymphal ticks of Hy. a. anatolicum derived from females collected from field. The experiments revealed that Hy. a. anatolicum was capable of transmitting Babesia U sp. transovarially in larval (2 of 4 calves), nymphal (6 of 6 calves) and adult (3 of 8 calves) stages, with prepatent periods of 16, 12, and 8 days, respectively, and that this Babesia was also transovarially transmitted by both the nymphal and adult stages of Hy. detritum and Hy. rufipes. Attempts to transmit this Babesia U sp. transovarially with Hae. longicornis and B. microplus, and transstadially with Hyalomma spp., were carried out, and the results proved to be negative.  相似文献   

Experiments on transmission of an unidentified Theileria sp. to small ruminants with Haemaphysalis qinghaiensis and Hyalomma anatolicum anatolicum     

Yin H  Luo J  Guan G  Lu B  Ma M  Zhang Q  Lu W  Lu C  Ahmed J 《Veterinary parasitology》2002,108(1):21-30

Experiments on the transmission of an unidentified Theileria sp. infective for small ruminants by Haemaphysalis qinghaiensis and Hyalomma anatolicum anatolicum were carried out. Three Theileria-free batches of adult, larvae, and nymphs of laboratory reared H. qinghaiensis and Hy. a. anatolicum ticks were infected by feeding them on sheep infected with Theileria sp. The Theileria sp. was originally isolated from adult ticks of H. qinghaiensis, by inoculation of blood stabilates or tick transmission. H. qinghaiensis has been shown to be capable of transmitting the Theileria sp. infective for small ruminants transstadially to sheep and goats. The nymphs developed from the larvae engorged on the sheep infected with the parasite transmitted the pathogen to splenectomized sheep with prepatent periods of 30, 31 days, respectively; but the subsequent adult ticks of H. qinghaiensis derived from the nymphs did not transmit the pathogen to sheep. However, adults developed from the nymphs engorged on the sheep infected with the parasite transmitted the pathogen to sheep with prepatent periods of 24-27 days. The larvae, nymphs and adult ticks derived from female H. qinghaiensis ticks engorged on infected sheep were not able to transmit the parasite transovarially. The same experiments were done with Hy. a. anatolicum, but examination for presence of piroplasma of Theileria sp. from all animals were negative, demonstrating that Hy. a. anatolicum could not transmit the organism to sheep or goats.  相似文献   

牛奶体细胞评分、胎次、季节与产奶量及乳成分相关性分析     

罗林  邹紫雯  宛麟  李鑫丽  王斯琦  沈冰蕾 《黑龙江八一农垦大学学报》2022,34(1):44-49,92

为研究黑龙江地区牛奶体细胞评分、产奶量、乳成分间的关系以及体细胞评分所造成的损失.收集了黑龙江某奶牛场2017～2019年成年荷斯坦奶牛的生产性能测定记录.收集数据录入EXCEL后,剔除不符合标准的数据.之后利用SPSS 26软件对奶牛胎次、产奶季节、体细胞评分、产奶量、乳成分进行显著性以及相关性分析.分析结果表明,奶...  相似文献   

Production of hexaploid triticale by a synthetic hexaploid wheat-rye hybrid method     

Ming Hao  Jiangtao Luo  Lianquan Zhang  Zhongwei Yuan  Youwei Yang  Meng Wu  Wenjie Chen  Youliang Zheng  Huaigang Zhang  Dengcai Liu 《Euphytica》2013,192(3):347-357

Grain weight is an important factor contributing to grain yield in wheat. Markers closely linked to grain weight could be used in marker-assisted selection (MAS) to accelerate the wheat breeding process. In this paper, a second backcross recombinant inbred line (BC₂F₄) population, a recombinant inbred line (RIL) population, and one natural population were used to study the relationship between allelic variants of the grain weight gene TaGW2-6A and grain weight, width, and length with the goal of verifying the feasibility using the functional marker Hap-6A-P1/P2 in MAS. The differences in average grain weight, width, and length between haplotypes Hap-6A-G and Hap-6A-A were 8.09 g, 0.22 mm, and 0.38 mm, respectively, in the BC₂F₄ population; 4.01 g, 0.11 mm, and 0.10 mm in the RIL population; and 3.95 g, 0.10 mm, and 0.20 mm in the natural population. All the differences were significant. Sequencing results of the products of second round PCR indicated that a 167 bp TaqI restriction fragment had been generated from small-grain-size materials because of three TaqI restriction sites (TCGA). However, the large-grain-size variant generated a 218 bp fragment due to a single-nucleotide mutation (SNP) (TCGA → TCGG) at the third site. TaGW2-6A expression levels were negative with respect to grain width, length, and weight. For this reason, Hap-6A-G was considered a superior allele. These results contradict those of a previous study, which showed Hap-6A-A to be significantly associated with wider grain and higher grain weight.  相似文献   

天柱县烟稻两熟晚稻品种适应性初探     

杨永灯  罗国恒  高常维  杨琼 《耕作与栽培》2013,(3):20-22

对10个早、中和中晓熟的晚熟品种进行试验,筛选出适合天柱气候条件的几个晚稻品种,早熟的湘优2号,中熟的T优583、奥富优908、湘优66、湘菲优8118,中晚熟的T优179,在6月26日播种,投产比为1：1.14～1.55,纯收入在99.42～359.42元/667m2,在天柱海拔400m以下地区推广种植烟稻两熟,可获400～500kg/667m2稻谷,增加劳务收入500元左右,增加纯收益100～350元.  相似文献   

一套优异稻种资源的纹枯病抗性评价   总被引：1，自引：1，他引：0  

刘毅  陈亮  付冬  楼巧君  罗利军 《作物杂志》2013,(1):53-57

2008年在湖北恩施、2009年和2010年在海南陵水分别采取自然诱病和人工接种方法对158份中国水稻微核心种质和137份“全球水稻分子育种计划”亲本材料进行了抗纹枯病大田鉴定和评价,未发现免疫材料,抗病和中抗材料的比例分别为0.3％和13.9％;大多数属于感病范围,中感、感病和高感材料的比例分别为40.0％、25.8％和20.0％.其中BR24、Hnankar、解放籼、秕五升、赤壳糯、红旗5号、泽谷、寸谷糯和旱麻稻在3年2地的鉴定中均达中抗水平;Serendahkuninmdaysia、SAI-BUI-BAO、Giza14和香稻在个别年份中达抗病水平.在海南2年试验中测定了各材料的纹枯病病级、相对病斑长、相对病斑高、抽穗期和株高,通过分析,发现纹枯病病级与相对病斑长和相对病斑高呈极显著正相关,而与抽穗期和株高呈极显著负相关,相对病斑长和相对病斑高可以作为抗性鉴定和评价的指标之一.  相似文献   

Distribution and Sources of Polycyclic Aromatic Hydrocarbons in Suspended Particle Mater in Rainy Season from Jialing River in Chongqing     

Cai Wenliang  Xie Yanyun  Luo Guyuan  Xu Xiaoyi 《保鲜与加工》2013,(5):67-72

16 polycyclic aromatic hydrocarbons (PAHs) were measured by GC-MS for 13 suspended particle matter samples collected from Jialing River in Chongqing in rainy season. The results showed that the total concentrations of 16 PAHs ranged from 447.47 ng/g to 1 344.92 ng/g, with a mean value of 927.48 ng/g. The concentration of total PAHs in suspended particle matter showed the trend of“up-down-up-down”in spatial distribution in the 13 sampling sites. The predominant PAHs in suspended particle matter were 4 ring PAHs, which accounting for 41.87% of the tatal PAHs. The ratio analysis and principle factor analysis-multiple linear regression(PCA-MLR) indicated that the major source of PAHs was the engine combustion source, in which the proportion of gasoline combustion and diesel combustion were 37.79% and 29.97%, respectively. The ecological risk of PAHs was evaluated by the effects range median values (ERM) and the effects range low values (ERL). The results illustrated that Acy, Ace, Fl and DahA had certain ecological risks, while the ERL values of other12 PAHs in all suspended particle matter samples were lower than the ERL guideline value,namely, PAHs in Jialing River in Chongqing could not cause obvious ecological risk.  相似文献   

小兴安岭绢蝶的采集与观赏工艺品制作     

周雪婷  朱云  吕冬云  李春丰  李佳琳  罗志文 《中国林副特产》2013,(2):70-72

通过对小兴安岭绢蝶种类进行采样调查,已经掌握了小兴安岭绢蝶科昆虫的发生时间与分布规律,并对优势种类进行采集分析,为后续进行生物学特性观察与人工饲养积累资料。对采得的绢蝶优势种进行观赏工艺品加工制作,为饲养后开发绢蝶工艺品及建设北方生态绢蝶园,大力开发特色养殖产业和发展旅游业服务。  相似文献   

光肩星天牛刻槽的微生境     

邓彩萍  闫喜中  刘红霞  骆有庆 《林业科学》2013,49(1):169-173

研究北京和宁夏两地5个树种上光肩星天牛刻槽含水量、pH值及微生物多样性.结果表明:两地的刻槽中期含水量最高,且高于同期健康树皮,晚期次之,早期最少.刻槽的pH值(7.88 ～9.98)均偏碱性,高于健康树皮pH值(6.06 ～7.10).两地的刻槽共分离到真菌12属、473株菌株,8种鉴定至种级;优势属为镰刀菌属,刻槽真菌数量多于健康树皮.宁夏各树种刻槽真菌多样性指数(H)、丰富度指数(S)比健康树皮高,北京各树种刻槽H,S低于健康树皮.两地各树种刻槽内细菌群落种类大致有2种,为黄单胞杆菌属细菌和白色未定名细菌,此外,北京旱柳刻槽内分离到黏质沙雷氏菌,该菌是一种昆虫致病菌.刻槽内放线菌只分离到1种,为链霉菌属放线菌.  相似文献