水稻条纹病毒在玉米和水稻上流行差异分析     

程兆榜  陈思宏  朱荣鹏  刘海建  魏邦庆  熊如意  周彤  季英华  周益军  范永坚 《勤云标准版测试》2006,(12)

为了明确水稻条纹病毒(RSV)在水稻和玉米上发生程度差异明显的原因,从一个侧面了解RSV流行本质,2004年在洪泽进行田间试验。采用黄盘诱集、盘扑、盘刮、肉眼计数等方法比较武育粳3号和掖单13上灰飞虱侵入和消长动态,结果表明两者均只有一个成虫侵入高峰,单位面积迁入虫量前者是后者的3.6倍,单株平均虫量相近。Dot-ELISA法测定灰飞虱带毒率为40%,成虫迁移扩散高峰期22d内两者接毒量约为每天百株137头带毒虫。武育粳3号有二代若虫发生,掖单13则无。逐日调查发病进程,结果显示水稻发病率为60%,玉米为0。室内抗性鉴定,掖单13对RSV的抗性比武育粳3号高4个级别。综合以上结果,寄主品种抗性决定了RSV在水稻和玉米上流行状况,二代若虫重复侵染是RSV在水稻上重发的另一主要原因。  相似文献   

以塘坝为中心建设立体型综合开发小区     

于明 《中国水土保持》1994,(1):49-50

以塘坝为中心建设立体型综合开发小区于明（黑龙江省青冈县水土保持办公室，１５１６０６）塘坝是我国水利水保建设的重要工程措施之一。它不仅可防洪蓄水，防治水土流失，同时对解决农田抗旱灌溉、养鱼等综合开发利用具有重要作用。搞好以塘坝建设为中心的小流域综合开发...  相似文献   

矸酆恐?,垩白率与糙米率、蛋白     

手渚氏灾 《粮食储藏》2001,(6)

Χ灾绷吹矸酆康挠跋焓钦?,直接影响比间接影响大。Study on the correlation between rice quality and agronomic traits of quality riceNIE Cheng rong, WEN Yu hui, WANG Yun bo, CHEN Ming zhong,LI Mei, LIU Dao quan(Agronomy Department, Foshan University , Nanhai 528231,China)The correlative analy  相似文献   

Long-term variation in brown trout, Salmo trutta L., stocking success in a large lake: interplay between availability of suitable prey and size at release     

P. Hyvärinen  A. Huusko 《Ecology of Freshwater Fish》2005,14(4):303-310

Abstract –  Factors affecting long-term variation in brown trout, Salmo trutta L., stocking success were examined in a large lake, Lake Oulujärvi, in central Finland. Brown trout were stocked in spring (late May to early June) in 1974–1991 and in summer (late June to early July) in 1992–2001. The biomass of the vendace, Coregonus albula (L.), population (prey) at release time had the largest positive effect on stocking success within both periods: biomass of adult vendace in spring and both 0+ and adult vendace in summer. Increasing the size of stocked fish had a positive effect if the vendace available at release were only adults. The increasing trend of predator-catch-per-unit-effort (CPUE) [combined CPUE of northern pike Esox lucius L., burbot Lota lota (L.), and pike-perch Stizostedion lucioperca (L.)] through the study period and its negative effect on trout stocking success suggested an increasing effect of predation within the entire time series.  相似文献   

The Application of GIS in Small Watershed Classification in Loess Plateau     

Zhu Jinzhao  Wu Bin  Bi Huaxing  Zhou Changqing College of Soil  Water Conservation  Beijing Forestry UniversityBeijing  P.R.China 《中国林学(英文版)》1994,(2)

ＴｈｅＡｐｐｌｉｃａｔｉｏｎｏｆＧＩｓｉｎＳｍａｌｌＷａｔｅｒｓｈｅｄＣｌａｓｓｉｆｉｃａｔｉｏｎｉｎＬｏｅｓｓＰｌａｔｅａｕＺｈｕＪｉｎｚｈａｏ，ＷｕＢｉｎ，ＢｉＨｕａｘｉｎｇ，ＺｈｏｕＣｈａｎｇｑｉｎｇＣｏｌｌｅｇｅｏｆＳｏｉｌａｎｄＷａｔｅｒＣ...  相似文献   

新疆水土保持情况调查     

郭廷辅  佟伟力 《中国水土保持》1994,(12):5-8

新疆水土保持情况调查郭廷辅，佟伟力（水利部水土保持司，北京１００７６１）我们于１９９４年８月１１日至２６日对新疆伊犁、和田、喀什、吐鲁番、昌吉、乌鲁木齐等６个地区（州、市）的１１个县（市）、两个流域的水土流失情况和开展治理工作做了典型调查。同时，也对...  相似文献   

杂交条纹鲈苗种小水泥池培育技术试验     

田功太段登选  曹振杰马荣棣  陈述江孙栋 陈金萍 《齐鲁渔业》2004,21(7):1-3

用地上露天小水泥池8个．进行杂交条纹鲈苗种培育试验．放养313龄水花30000尾．通过天然饵料、藻粉投喂以及适当水质管理措施．经32天培育，共培育3．5～4．6cm体长的鱼种4336尾．最高成活率为19．1％，最低为6％，平均为14．5％。  相似文献   

小流域治理成果的开发利用途径     

李志正  雷升文 《中国水土保持》1994,(1):46-48

根据市场经济的要求和目前小流域治理中普遍存在的高投入、低效益问题，提出以市场经济为导向，通过合理开发利用治理成果，优化组合资源、资金、劳力、技术等生产要素，努力发展商品生产，提高小流域治理的经济效益。结合各地实践，总结出基本农田的集约经营、水保林的经营增值、水保草的养畜转化、非生产地的开发利用、转化产品的加工增值和疏通流通渠道六条开发利用途径。  相似文献   

实验性流行性腹泻仔猪小肠粘膜上皮细胞及肠系膜淋巴结的超微结构     

田欣田  郑兆荣  邱震东  刘宝岩  杨盛华 《中国兽医学报》1988,(2)

给8头生后3d的哺乳仔猪经口感染猪流行性腹泻病毒(PEDV)“吉”毒株,于感染后18、30、45和96h各扑杀2头,以透射电镜和扫描电镜观察了小肠粘膜上皮细胞及肠系膜淋巴结的超微结构。结果表明,小肠上皮细胞的病变因感染时间不同而有明显差异。上皮细胞的脱落和残留上皮细胞超微结构的破坏,以感染后30h最严重,病毒在这些上皮细胞内的增殖最显著。感染后45h,见有大量新生上皮细胞修补损伤的肠绒毛。感染后96h,小肠绒毛短缩、粗大乃至发生融合。实验仔猪肠系膜淋巴结内巨噬细胞和淋巴细胞的超微结构均遭到破坏,在巨噬细胞内见有PED冠状病毒粒子。  相似文献   

Use of space by bank voles (Clethrionomys glareolus) in a polish farm landscape     

Michŀ Kozakiewicz  Anna Kozakiewicz  Aleksy Łukowski  Tomasz Gortat 《Landscape Ecology》1993,8(1):19-24

Movements of bank voles (Clethrionomys glareolus) were studied in a farmland mosaic in Poland. Distances crossed by animals in short-time periods are significantly longer in heterogenous than in homogenous habitats. In long-time and large-spatial scales, a significant portion of the animals in a population travel among habitat elements of the mosaic, reducing the degree of isolation of patch populations and decreasing the probability of local extinction.  相似文献