岭南地区荔枝主栽品种品质评价分析     

郑锦锦  刘帅  陈岩  张欣  杨慧  刘香香  王富华 《中国农业科技导报》2021,23(4):128-136

为探索岭南地区不同产区荔枝的营养品质特性及差异性,以海口、茂名、湛江、广州、惠州、汕尾6个荔枝主产区的8个荔枝品种为试验材料,测定单果重、可食率、Vc、还原糖、蔗糖、总酸、可溶性固形物、糖酸比8项品质指标,分析了不同品种、不同产区间荔枝品质的差异。结果表明：不同荔枝品种在单项品质指标上各有优劣,紫娘喜和糯米糍荔枝单果重和可食率分别最高,妃子笑荔枝Vc和还原糖含量最高,桂味荔枝蔗糖含量和可溶性固形物含量最高。不同品质指标存在相关性,主成分分析将8项品质指标综合为3个主成分,综合得分最高的是妃子笑荔枝。不同产地相同品种的荔枝品质指标也存在差异。海口、湛江、茂名3个产区妃子笑荔枝单果重、Vc、还原糖、蔗糖、可溶性固形物均无显著差异,但海口妃子笑荔枝可食率、糖酸比均显著高于湛江妃子笑;广州桂味荔枝的可食率、Vc和总酸含量均显著高于茂名桂味;在广州、惠州、汕尾3个产区糯米糍荔枝中,单果重、Vc、蔗糖含量最高的为惠州糯米糍。通过聚类分析将3个产区的荔枝分为了3类,每类所包括的荔枝均为相同的荔枝品种。研究结果将为荔枝鲜食品种的筛选及种植结构调整提供科学依据。  相似文献   

基于主成分分析评价园林小菊资源在西宁地区的适应性     

王启璋  王海滨  田洁 《中国农业科技导报》2021,23(11):62-72

为筛选适宜在西宁地区栽培推广的园林小菊资源,选取7份金陵系列园林小菊资源,通过测定菊花的表型性状及生理生化指标,采用相关分析、主成分分析、综合评价和聚类分析对7种园林小菊资源在西宁地区的观赏性和栽培适应性进行了评价。结果表明,7份菊花资源的株高、主茎粗、叶长、叶宽、叶重、花朵数、单花重、花层数、花径和冠幅的变异系数为28.80%~35.43%。相关分析表明,株高与冠幅、花层数与叶绿素a和叶绿素b含量间存在极显著正相关关系。主成分分析提取到3个主成分,第1主成分为“光合色素因子”,主要包括叶绿素a和类胡萝卜素含量;第2主成分为“花器官因子”,主要影响因子为花层数和花径;第3主成分为“植株形态因子”,主要包括株高、冠幅和叶长。聚类分析将7份菊花资源分为三类：第一类包括‘金陵赤心’和‘金陵红荷’,表现为叶绿素含量较低、植株较矮小、主茎较粗、叶片较重;第二类包括‘金陵潋滟’和‘金陵月桂’,表现为植株高大、冠幅宽大、花层数较多;第三类包括‘金陵玫瑰金’、‘金陵笑靥’和‘金陵阳光’,表现为花层数多、叶绿素含量较高。对7份资源进行综合评价（F值）,排名由高到低依次为：‘金陵玫瑰金’>‘金陵红荷’>‘金陵笑靥’>‘金陵阳光’>‘金陵赤心’>‘金陵潋滟’>‘金陵月桂’。综上所述,“光合色素因子”和“花器官因子”可作为适应性评价重要依据。‘金陵玫瑰金’和‘金陵笑靥’综合表现优异,在西宁地区具有较强的适应性,为菊花品种适应性评价及栽培技术提供了重要参考。  相似文献   

Introduction and comparison of two methods of assessment of coronary lesions in Atlantic salmon, Salmo salar L     

Seierstad SL  Poppe T  Larsen S 《Journal of fish diseases》2005,28(4):189-197

This study investigated and compared quantitative and semi-quantitative coronary lesion evaluation in Atlantic salmon, Salmo salar. A total of 121 immature farmed and 47 sexually mature wild Atlantic salmon were included. Coronary arteries from all fish were morphometrically evaluated using a semi-quantitative method. A subsample of 76 salmon was additionally evaluated using a quantitative method. Another subsample of 71 salmon was used for reliability testing of the semi-quantitative method. Ten cross-sections of coronary arteries located on the ventral surface of the bulbus arteriosus were semi-quantitatively scored with regard to myointimal coronary lesions. Quantitative measurements comprised maximal intimal thickness and area lesion (%) while semi-quantitative measurements comprised maximal intimal thickness and lesion degree (%). Scores for individual fish were expressed as the average of lesion score, denoted as mean range lesion. One person performed all evaluations blindly. Two pathologists tested repeatability of the semi-quantitative lesion score measurements blindly. Both semi-quantitative and quantitative variables increased significantly with increasing lesion score. Semi-quantitative estimation gave significantly higher maximal intimal thickness values than quantitative measurement. Semi-quantitative measurements were found to explain 63.2% of variation in quantitatively measured maximal intimal thickness. Due to lack of agreement, the two methods are not directly comparable and one method cannot replace the other. Repeatability within and between observers with regard to semi-quantitative classification was very good with Kappa values larger than 61.5%. The semi-quantitative method was a valid and reliable method for coronary lesion evaluation in Atlantic salmon.  相似文献   

Surveys on Coxiella burnetii infections in Swedish cattle,sheep, goats and moose     

Anna Ohlson  Jonas Malmsten  Jenny Fr?ssling  G?ran B?lske  Anna Aspán  Anne-Marie Dalin  Ann Lindberg 《Acta veterinaria Scandinavica》2014,56(1):39

Background

Q fever is a zoonotic disease caused by the bacterium Coxiella burnetii. Prevalence data in ruminant species are important to support risk assessments regarding public and animal health. The aim was to investigate the presence of or exposure to C. burnetii in cattle, sheep, goats and moose, and to compare two enzyme-linked immunosorbent assays (ELISAs). National surveys of antibodies against C. burnetii were performed for dairy cattle (n=1537), dairy goats (n=58) and sheep (n=518). Bovine samples consisted of bulk milk, caprine of pooled milk, and ovine of pooled serum. Antibodies were investigated in moose samples (n=99) from three regions. A one-year regional cattle bulk milk survey was performed on the Isle of Gotland (n=119, four occasions). Cattle, sheep and goat samples were analysed with indirect ELISA and moose samples with complement fixation test. For the sheep, goat, and parts of the cattle survey, samples were run in parallel by ELISAs based on antigens from infected ruminants and ticks. Bulk milk samples from the regional cattle survey and vaginal swabs from a subset of the sheep herds (n=80) were analysed for the agent by polymerase chain reaction. Spatial clustering was investigated in the national cattle survey.

Results

The prevalence of antibodies in dairy herds was 8.2% with large regional differences. High risk clusters were identified in the southern regions. The prevalence among dairy herds on the Isle of Gotland varied from 55.9% to 64.6% and 46.4% to 58.9.0% for antibodies and agent, respectively, overall agreement between agent and antibodies was 85.2%. The prevalence of antibodies in sheep was 0.6%, the agent was not detected the vaginal swabs. Antibodies were not detected in goats or moose, although parts of the moose samples were collected in an area with high prevalence in cattle. The overall agreement between the two ELISAs was 90.4%.

Conclusions

The prevalence of antibodies against C. burnetii in dairy cattle in Sweden shows large regional differences. The results suggest that C. burnetii is a rare pathogen among Swedish moose, dairy goat and sheep. ELISAs based on ruminant and tick antigen performed in a similar manner under Swedish conditions.  相似文献   

黔中喀斯特石漠化区次生林树种的经济功能评价及功能群划分     

葛龙允  喻理飞  严令斌  袁丛军  周晨  蔡国俊 《云南林业科技》2014,(3):62-69

通过构建树种经济功能综合评价指标体系,采用层次分析法（AHP）,对黔中喀斯特次生林中25种优势树种经济功能进行综合评价,并划分树种经济功能群。结果表明,基于AHP评价结果与黔中喀斯特森林树种经济性能现状较为一致, AHP在喀斯特森林树种经济功能综合评价体系构建中是科学且实用的。黔中喀斯特森林25种优势树种分为7个经济功能群：（1）药用-观赏型高经济功能群（ PFGsⅠ）,树种为厚朴、喜树和盐肤木;（2）食用型高经济功能群（PFGsⅡ）,树种为茅栗和木姜子;（3）食用-工业型中经济功能群（PFGsⅢ）,树种有川榛和竹叶椒;（4）食用型中经济功能群（PFGsⅣ）,树种为火棘;（5）工业型中经济功能群（PFGsⅤ）,树种为滇柏、光皮桦、响叶杨等7种;（6）药用-观赏型低经济功能群（PFGsⅥ）,树种为金佛山荚蒾、金丝桃、算盘子等9种;（7）食用型低经济功能群（PFGsⅦ）,树种为粉枝莓。描述了各类经济功能群的基本特征,为研究区生态经济型次生林经营的树种选择、结构优化提供理论依据。  相似文献   

云瑞系列甘蔗亲本的遗传力和配合力分析     

安汝东  朱建荣  周清明  桃联安  杨李和  边芯  孙友芳  经艳芬  董立华 《广西农业科学》2014,(1):1-6

[目的]对云瑞系列甘蔗亲本及组合的优劣进行评价,为加速云南甘蔗野生资源利用,提高种质创新水平,合理利用云瑞系列亲本选配杂交组合和甘蔗新品种提供参考.[方法]用28个云瑞系列亲本与36个国内外引进亲本进行杂交,获得65个杂交组合,采用家系试验评价方法,分析杂交后代主要性状的遗传力和配合力.[结果]母本、父本及组合对杂交后代株高、茎径、有效茎数和产量等性状的影响均达显著以上水平.母本、父本和组合对后代的遗传力贡献表现为组合（66.39％）＞母本（59.89％）＞父本（51.59％）,后代主要性状的遗传力大小顺序为有效茎数＞茎径＞锤度＞株高;母本对F1代的株高、茎径、有效茎数、锤度等性状的遗传力贡献分别为51.28％、65.63％、68.95％、53.71％,父本的贡献分别为19.72％、66.42％ 、78.13％、42.07％.云瑞系列亲本用作父本时产量和锤度的一般配合力高于用作母本的一般配合力.根据特殊配合力的大小和作用方向,可将28个云瑞系列亲本及衍生的65个组合分为高产高糖类、高产类、高糖类及表现较差不适宜用作品种选育等4种类型.[结论]云瑞系列亲本与其他系列亲本杂交时适合用作父本,而不适合用作母本;筛选出的高产高糖类、高产类、高糖类云瑞系列优良亲本及组合具有一定的育种潜力.  相似文献   

芒果果实品质评价因子的选择   总被引：2，自引：0，他引：2  

辛明  张娥珍  何全光  阳仁桂  罗慧馨  黄振勇  苏燕竹  黄茂康 《广西农业科学》2014,45(10):1818-1824

【目的】简化芒果品质评价因素,为制定芒果品质评价指标提供参考依据。【方法】采用主成分分析、系统聚类分析及合理—满意度多维价值理论的合并规则,对广西栽培的18个芒果品种的果形指数、硬度、可溶性固形物含量、可滴定酸含量、可溶性糖含量和风味等19个主要品质指标进行综合评价,筛选芒果果实品质简化评价因子。【结果】芒果的多个品质指标变量间存在相对独立性和密切相关性,主成分分析后提取出可溶性固形物和可溶性总糖含量特征向量较大、水分含量特征向量绝对值较大等7个主成分,系统聚类分析后19个品质指标聚类简化成糖酸比、果肉色泽（L^＊）、维生素C（Vc）、果实硬度等9个代表性指标,经合理—满意度多维价值理论合并规则综合评价,筛选出红芒6号、紫花芒、桂热82号、桂热120号和香芒5个品种为品质较优品种。【结论】主成分分析、系统聚类分析及合理—满意度多维价值理论的合并规则可用于简化芒果果实品质评价工作。  相似文献   

建阳市森林生态系统服务价值评估   总被引：1，自引：0，他引：1  

苏少川  廖旺顺  刘剑斌  龚辉  张水生  肖应忠  周金明  毛昌华  林芝  周世玉  陈建忠 《西南林学院学报》2014,(1):73-77

根据建阳市2011年森林资源清查资料和相关部门提供的监测数据,应用《森林生态系统服务功能评估规范》对其森林生态系统服务功能进行价值评估,结果表明：2011年建阳市森林生态系统服务功能总价值为169．27亿元／a;7项服务功能价值大小排序为涵养水源〉生物多样性保护〉保育土壤〉固碳制氧〉物质生产〉净化大气环境〉森林旅游,其中涵养水源、生物多样性保护和保育土壤3种服务价值占整个森林生态系统服务功能总价值的80．2％。  相似文献   

凤山县耕地地力评价研究     

韦翠恋  许涛  高海真 《广西农学报》2014,29(5):42-45

为了弄清凤山县耕地地力等级情况,以凤山县测土配方施肥和第二次土壤普查等数据资料为基础,利用GIS技术和县域耕地资源管理信息系统,对凤山县耕地地力等级情况进行评价研究。结果表明,凤山县耕地地力等级可分为六个等级,一、二级的耕地占耕地总面积的13.15%,是高产稳产耕地;全县耕地地力等级以三至六级为主,占耕地总面积的86.85%,是凤山县粮食、水果和经济作物生产的主要基地,也是主要的中低产耕地。  相似文献   

主成分回归法对亚麻纤维产量的综合评价     

吴建忠 《东北农业大学学报》2014,(11)

研究通过对亚麻12个农艺性状的相关性分析,确定亚麻纤维产量相关显著的农艺性状,利用主成分分析原理进行相关性状的降维处理,消除亚麻纤维产量综合评价中存在的性状间多重共线性影响,对亚麻纤维产量进行综合评价。结果表明,主成分回归法可以有效消除亚麻纤维产量综合评价中出现的性状间多重相关性问题,该法可对亚麻纤维产量进行综合评价,为作物产量的综合评价提供新思路。  相似文献