天目蜜李丰产技术研究     

王陈顺  李雪涛 《浙江林业科技》2001,21(5):47-49

配置一定比例授粉树种，是提高授粉效果获得丰产的基础。授粉树比例幼龄期高于成龄期，授粉树花期应与天目蜜李基本一致、果形近似、品质好、抗性强的优良品种，这样才能确保果品的质量与产量。  相似文献   

应用MODIS-NDVI对草原植被变化监测研究--以锡林郭勒盟为例   总被引：13，自引：1，他引：13  

邢旗  刘爱军  刘永志  高娃 《草地学报》2005,13(Z1):15-19

利用新一代卫星遥感数据MODIS,进行草原植被专题信息的提取,同时结合地面调查数据,分析2002、2003年5月30日归一化植被指数(NDVI),并根据其分级图,对天然草原植被长势的时间和空间变化特征和变化规律进行研究,从而对引起草原植被发生变化的可能原因,特别是由于禁牧、休牧的影响进行分析评价.  相似文献   

春季休牧对草原和家畜生产力的影响   总被引：11，自引：2，他引：11  

李青丰  赵钢  郑蒙安  阿民布和 《草地学报》2005,13(Z1):53-56,66

从4月上旬到6月下旬,在内蒙古锡林郭勒典型草原,进行春季休牧试验,对休牧和非休牧的草原进行生产力监测.结果表明:春季休牧可以有效地保护草原生态环境,经过两个月休牧后,草原植被状况明显改善;休牧期间采用低投入维持性饲养,可以显著降低饲养成本.并对休牧措施的生态效益、生产实践可行性和经济合理性进行综合讨论和评价.  相似文献   

木棉雄蕊特征与其繁殖策略的关系分析     

罗晓滔  胡世俊  马焕成 《林业调查规划》2020,45(2):143-148

采用野外观察和实验室检测方法,对云南省个旧市冷墩村的木棉花部结构、雄蕊特征、花粉活性进行研究。结果表明,自然种群中花部形态特征具有一定变异性,3层雄蕊变异系数大小关系显著。在湿度为60%、温度为35℃时花粉活性最强。研究发现,木棉雄蕊长短变化可能有利于不同传粉生物传粉效率提高和增强适应性;木棉高层雄蕊花药个体大、花粉数量多、活性高,适应干热河谷传粉繁殖条件;温度较低时,底层花药花粉活力相对较高,可为逆境环境下木棉高层花药受损后提供后备花粉源。文章就木棉花部形态与繁殖关系、木棉形态及花粉活力对繁殖的影响进行讨论。  相似文献   

梨不同品种授粉特性的研究     

李琛  朱京涛 《湖南农业科学》2015,(4)

选用中梨一号、秋黄、八月酥、西子绿、丰水5个梨优良品种进行自花及异花授粉,研究其落花落果及坐果特性。结果表明,不同品种自花授粉的坐果率不一样,中梨一号、秋黄、八月酥自花授粉不结实,而丰水自花授粉的坐果率最高,为37.69%。不同授粉品种对落花落果和坐果率的影响也不同,坐果率与落花落果率呈极显著负相关,坐果率与花粉量呈显著正相关。  相似文献   

Comparative morphology of the digestive system of 19 species of Southern African myomorph rodents in relation to diet and evolution     

M.R. Perrin  B.A. Curtis 《African Zoology》2013,48(1):22-33

Trends in digestive system-morphology have been examined in 19 species of Southern African myomorph rodents. Structure was related to function, diet, and evolution. Characters related to an ancestral proteinaceous diet, and specialized characters associated with herbivory, were recognized. All stomachs were of the unilocular hemiglandular type with increasing degrees of cornification of the corpus, although the stomach of Saccostomus compestris approached the bilocular discoglandular condition. Those of Thallomys paedulcus and Mystromys albicaudatus were highly modified in containing numerous papillae in the corpus, possibly associated with gastric fermentation. The most complex caeca, of the herbivorous Otomyids, possessed numerous haustra and internal papillae probably associated with caecal microbial fermentation.  相似文献   

中华蜜蜂对荔枝园常见化学农药的触角电位反应     

高景林  赵冬香  卢芙萍  王爱萍  廖锡华 《中国蜂业》2006,57(12):11-13

利用触角电生理技术测定了中华蜜蜂对荔枝园常用10种化学农药的触角电位反应（EAG）。结果表明，中华蜜蜂对不同化学农药品种的EAG反应值各不相同，其中高效顺反氯氰菊酯引发的EAG反应值最大，而生绿Bt粉剂引发的EAG反应值最小，两者间的差异达到极显著水平。这些农药品种引发中华蜜蜂EAG反应值的大小顺序为：高效顺反氯氰菊酯〉乐斯本乳油〉乐果乳油〉杀虫双水剂〉农地乐〉敌杀死乳油〉阿维菌素乳油〉灭百可乳油〉敌百虫乳油〉生绿Bt粉剂。这些研究结果可为我们从保护授粉蜜蜂的角度出发，在荔枝园中有选择性地施用对蜜蜂不敏感的农药品种提供有益参考。  相似文献   

Influence of self-pollination in fruit quality of autogamous almonds     

E. Ortega  P.J. Martínez-GarcíaF. Dicenta 《Scientia Horticulturae》2006

Due to the several advantages expected from growing self-compatible almond cultivars, breeding programmes have recently introduced self-compatibility as an important trait. However, doubts have arisen regarding the capability of the newly obtained self-compatible almonds to produce good yields in monovarietal plantations, and the commercial quality of the fruits from self-pollination. For this reason, in the last years several studies have been conducted to evaluate fruit set and fruit traits following self- and cross-pollination of self-compatible almonds. Their results showed inconsistencies for fruit set and for some of the fruit traits studied. Thus, while some studies showed no differences between both pollination types for any of the fruit traits, others clearly showed important differences with the detriment of self-pollination for commercially important fruit traits. The fact that some of these studies evaluated a low number of individuals and/or fruit traits, implies the need of a more complete study. In this work, 10 fruit traits were studied in 26 self-compatible almonds following self-pollination by bagging and open pollination treatments. In general, and despite a few individuals showed differences between both pollination types for two of the traits, the results showed no influence of self-pollination in fruit quality.  相似文献   

采后热空气处理对金冠苹果后熟衰老及病害的影响   总被引：2，自引：1，他引：2  

屠康  邵兴锋  赵艺泽 《果树学报》2006,23(4):562-567

金冠苹果采用38℃,72h或96h热空气处理,可降低0℃贮藏中果实的呼吸强度和乙烯释放量,延缓非溶性果胶的降解,维持较高的硬度、脆度,同时也会加速果皮的褪绿变黄和固酸比的上升,尤其是38℃96h处理的作用效果更为明显,显著提高了货架期后(20℃7d)苹果的质地品质和可接受程度,延缓衰老。苹果分别接种扩展青霉、灰葡萄孢霉,0℃和20℃条件下其病害发生率和腐烂均很严重,采用38℃96h热空气处理可以完全控制病害的发生,避免腐烂。可见,热空气处理一方面能延缓金冠苹果的后熟衰老,另一方面还能控制贮期病害的发生。  相似文献   

美国杏李人工投粉试验初报     

王建春  杨长群李娜  李广华余慧 《北方果树》2007,(2):11-13

美国杏李中一些品种自花授粉不结实，必须配置授粉树或进行人工辅助授粉。授粉方法，用2．5kg蔗糖＋0．15kg硼砂＋20g花粉＋50kg水配成溶液喷雾。各授粉品种组合、授粉效果从优到劣的排列顺序为：风味皇后♀×恐龙蛋♂、风味皇后♀×味厚♂风味皇后♀9×味王♂。  相似文献