Development and characterization of microsatellite markers for caladiums (Caladium Vent.)     

LI Gong  Zhanao Deng 《Plant Breeding》2011,130(5):591-595

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Direct impacts of recent climate warming on insect populations     

Christelle ROBINET  Alain ROQUES 《Integrative zoology》2010,5(2):132-142

Effects of recent climate change have already been detected in many species, and, in particular, in insects. The present paper reviews the key impacts of global warming on insect development and dispersal. The effects of climate change appear to be much more complex than a simple linear response to an average increase in temperature. They can differ between seasons and bioclimatic regions. Earlier flight periods, enhanced winter survival and acceleration of development rates are the major insect responses. Differential response of insects and hosts to warming up might also lead to disruption of their phenological synchrony, but adaptive genetic processes are likely to quickly restore this synchrony. In a number of cases, warming results in removing or relocating the barriers that limit present species' ranges. It is also likely to facilitate the establishment and spread of invasive alien species. Finally, knowledge gaps are identified and future research interests are suggested.  相似文献   

宁夏干旱区露地礼品西瓜适应性栽培性状的比较   总被引：1，自引：0，他引：1  

杨海霞  曲继松  张丽娟  郭文忠  冯海萍  杨冬艳 《北方园艺》2012,(16):24-25

对8个礼品西瓜品种的植物学性状、抗病性、产量及品质等性状进行了比较试验。结果表明:"黑美人"、"新金兰"不仅抗病、丰产,品质较好,而且产量均超过3 800kg/667m2,在宁夏干旱区露地栽培具备推广价值。  相似文献   

南昌市道路绿化树种调查分析与建议     

尤春波  陈卫军  章晴  李莲芳 《河南林业科技》2013,33(1):29-31,62

通过对南昌市道路主要绿化树种种类、使用频率及长势进行调查,并对存在的问题进行分析与探讨,同时根据南昌市的实际情况,提出了几点建议和措施。  相似文献   

Downstream drift of round goby (Neogobius melanostomus) and tubenose goby (Proterorhinus semilunaris) in their non‐native area     

Michal Janáč  Luděk Šlapanský  Zdenka Valová  Pavel Jurajda 《Ecology of Freshwater Fish》2013,22(3):430-438

Several Ponto‐Caspian gobiid species have recently expanded their ranges in Europe and North America. This is the first study to demonstrate passive downstream dispersal (drift) of the round goby (Neogobius melanostomus) and tubenose goby (Proterorhinus semilunaris) in newly colonised areas (River Dyje, Danube basin), a factor that could play an important role in their dispersal. Drift duration (i.e. number of dates on which the species was caught) in round goby was longer than that of both native species and tubenose goby, providing a possible advantage. Size of drifting fish was restricted to a narrow range of 6–8 mm and 5–8 mm for round and tubenose goby, respectively. Drift in both species occurred almost completely during hours of darkness (<1 lux) and fish size did not vary throughout the night. In both species, drift density increased significantly during the first hour after dusk. Round goby density gradually decreased up to dawn, while tubenose goby density varied throughout the night with no clear pattern. Drift of early life stages appears to be an important phenomenon that has not received adequate attention in studies of round and tubenose goby ecology and dispersal.  相似文献   

几种杀螨剂对3种叶螨的毒力比较   总被引：1，自引：0，他引：1  

顾耘  张迎春  赵川德  李绍信 《青岛农业大学学报(自然科学版)》2000,17(3):203-206

作者于 1 996年对二斑叶螨 (TetranychusurticaeKoch)、朱砂叶螨 [T .cinnabarinus(Boisdural) ]和山楂叶螨 (T .viennensisZacher)进行了三氯杀螨醇、甲氰菊酯、哒螨酮、霸螨灵等 4种杀螨剂的毒力测定 ,并对 3种叶螨在LC50 和LC95水平上 ,比较了相互之间的毒力差别。结果表明 ,二斑叶螨的毒力最高 ,朱砂叶螨次之 ,山楂叶螨毒力最低。  相似文献   

半荒漠地区灌木饲料林营造技术研究   总被引：5，自引：0，他引：5  

孙德祥 《干旱区资源与环境》1995,9(2):74-79

本文对半荒漠地区灌木饲料林的树种选择、经营管理等问题进行了初步探讨，给出了花棒、杨柴、柠条、沙柳、毛条、毛柳、白沙蒿、油蒿８个半荒漠地区灌木饲料林树种的造林适宜立地类型、最适造林季节、最佳造林密度、最适收获期以及最佳平茬年龄。  相似文献   

杆垫刃属新属和一个新种的描述(垫刃目:垫刃科)     

谢辉  冯志新  黎少梅  殷友琴 《植物病理学报》1994,(4)

杆垫刃属新属(Rhabdotylenchus n. gen.)以其尾粗短,尾后部透明部分呈杆状,尾端平截有一凹痕,以及第一体环明显宽于其他体环并且该环角质层显著加厚与唇和其后的体部形成缢缩而显著区别于垫刃亚科(Tylenchinae rley, 1880)的其它属,该新属与近似属Tylenchus Bastian,1865的区别,除了独特的尾形和第一体环外,还以唇区显著缢缩,阴门位置较后(V>70vsV=60～70),明显区别于该近似属。广东杆垫刃线虫新属新种(Rhabdotylenchus guangdongensis n. gen., n. sp.)发现于广东省深圳市郊区的苦瓜根际土中。  相似文献   

银纹夜蛾人工饲养技术研究   总被引：2，自引：0，他引：2  

刘军  刘复生 《昆虫天敌》1994,16(4):170-174

本文在研究了各种环境因子对银纹夜蛾实验种群影响的基础上，进一步研究了食量，低温保种及饲养管理技术，设计了一种便于收集卵的新型产卵笼，并总结了人工饲养银纹夜蛾的技术要点。  相似文献   

新疆两种野生葱浸提液对几种植物病原真菌的抑制作用   总被引：10，自引：0，他引：10  

文冰  吕巡贤  程路明  谭敦炎  李涛  马玉萍 《中国生物防治》2001,17(4):170-174

新疆野生葱属植物资源十分丰富,本文就其中两个具有浓烈辛辣气味的种－长喙葱和滩地韭的组织浸提液对棉花,番茄等主要作物病害病原真菌生长的抑制特性进行了研究。试验结果显示：长喙葱浸提液对镰孢菌,轮枝菌,丝核菌及疫霉菌的生长具有明显抑制效果,其10、20和50倍稀释液对丝核菌12h的抑菌率分别为100％,94％,80％,而其10、20倍稀释液对镰孢菌12h的抑菌率分别为100％、72．2％,滩地韭浸提液能抑制镰孢菌,轮枝菌的生长,但不影响丝核菌的生长,两类浸提液的抑菌效果均受温度影响。并随稀释倍数和作用时间的增加而减弱,长喙葱浸提液在4℃冷藏室内放置10d和在121℃条件下放置30min都会丧失长喙葱浸提液经透析去除小分子化合物,其上清液、沉淀都无抑菌作用,说明抑菌有效成分属小分子化合物。  相似文献