稀释液中添加谷氨酰胺对绒山羊冷冻精液品质的影响

在绒山羊冷冻精液稀释液中分别添加0mmol/L、2.5mmol/L、5.0mmol/L、7.5mmol/L和10.0mmol/L五个梯度的谷氨酰胺,以确定冷冻效果最好的谷氨酰胺添加浓度,优化绒山羊冷冻稀释液配方。结果表明:添加5.0mmol/L谷氨酰胺组精子的活率、顶体完整率和生存指数均极显著或显著地高于其他试验组(P0.01,P0.05),而畸形率极显著或显著低于其他试验组(P0.01,P0.05);在脂质过氧化反应和抗氧化酶活性方面,添加5.0 mmol/L组MDA浓度极显著低于其他试验组(P0.01),而CAT活性极显著高于其他试验组(P0.01)。总之,在稀释液中添加5.0mmol/L谷氨酰胺,在冷冻—解冻过程中能起到很好的保护精子的作用。     

基于广义混合效应模型的云冷杉林天然更新计数方法研究

天然更新是森林恢复较好的办法,对未来林分结构和生物多样性具有深远的影响。更新模型能够模拟天然更新的现实和未来状况,为森林经营者提供准确的森林计划。以吉林省汪清林业局2013年设置的12块云冷杉针阔混交林为例,选择泊松和负二项分布形式,考虑样地间的随机效应,构建基于林分因子的云冷杉针阔混交林天然更新模型。结果表明：各个树种对林分因子的反应不一,白桦更新株数与林分每公顷株数和平均直径均呈负相关;红松和水曲柳更新株数不受各个林分因子的影响,更新株数是随机的;冷杉更新株数与林分每公顷断面积呈负相关;色木槭和云杉更新株数均与林分平均直径呈负相关。在考虑样地的随机截距效应后,模型的模拟效果显著提高。在构建天然更新模型时,林分密度是十分重要的因子,如果要人工促进天然更新,就要科学合理的采取经营措施,以确保合理的林分密度。另外样地间的差异是不容忽略的因素,需要利用混合效应模型方法来降低预测误差。     

美洲黑杨基因资源收存及其遗传评价的研究

从１７个国家引进３３１个黑杨派无性系（其中５２个美洲黑杨无性系）,在山东省长清县营建我国第一个黑杨派无性系基因库。连续１０年对基因库内美洲黑杨无性系进行了多性状系统研究,结果表明各无性系间在物候期、生长、生根、抗寒和抗病虫等方面均存在着显著的差异,遗传变异丰富;系间的主要性状与无性系起源纬度及各性状间存在一定相关性。主要材料性状变异的研究结果表明,３８个８年生美洲黑杨无性系在木材基本密度、纤维长度无性系间变异达到极显著水平;木材密度和纤维长度与树高和胸径呈一定相关性;木材密度和纤维长度这两个性状在遗传上相互独立,受不同遗传机制控制。利用分子遗传标记ＲＡＰＤ技术研究库内美洲黑杨无性系ＤＮＡ多态性,结果表明本库美洲黑杨ＤＮＡ多态率为８６％,再次证明本库美洲黑杨遗传多样性高,可为我国杨树改良提供丰富的育种材料。     

Mating Systems and Reproductive Success in Hermaphroditic Bay Scallop,Argopecten irradians irradians (Lamarck 1819), Inferred by Microsatellite‐based Parentage Analysis

In this study, we used microsatellite‐based parentage analysis to assess the mating system of a mass spawning bay scallop, Argopecten irradians irradians. Parental assignment was performed on 237 offspring and 14 candidate parents. Overall, 95% of all offspring were unambiguously allocated to their putative parents based on information from six highly polymorphic loci. Offspring from both the self‐fertilization and cross‐fertilization style were observed, the large variation of self‐fertilization rate among individuals displays a mixed mode of mating. The high variances in reproductive success resulted in a decline in effective breeding numbers (N_b/N = 0.71). The self‐fertilization rate was 32.89% for this mass spawning and the coefficient of inbreeding was estimated at around 16.5% per generation. When selfed larvae were removed, the relationship between relatedness and individual reproductive success was proved insignificant between half‐sibings and unrelated, which suggest that selection pressures other than avoidance of inbreeding may be responsible for the evolution and maintenance of the self‐compatible mating system of A. i. irradians. These results lend insight to A. i. irradians cultivation in present China and provide a genetic basis for the development of more effective spawning techniques.     

闽台两地生态旅游资源等级区划分

应用投影寻踪技术与聚类分析相结合的数学手段,通过对福建、台湾的81个县(市、区)的数据处理,对森林景观资源进行了分类区划。结果表明:福建生态旅游资源大致由内陆向沿海递减,即由内陆到沿海分别为第一等级、第二等级、第三等级;台湾生态旅游资源由中部山脉向东西两岸递减,即中部第一等级,东部第二等级、西部第三等级,这与福建及台湾的生态资源的地理分布相似。     

ACC合酶cDNA克隆及其对美洲黑杨体内乙烯产生的反义抑制

利用ＲＴＰＣＲ技术克隆了大豆ＡＣＣ合酶基因ＧＭＣＡＣＣＳＩ编码区１５ｋｂ的ｃＤＮＡ片段,经酶切图谱分析和序列分析鉴定后,反向插入到２元载体ｐＢｉｎ４３８中,构建了表达ＡＣＣ合酶反义ＲＮＡ的植物表达载体,转化农杆菌后用该农杆菌侵染美洲黑杨叶片,在含卡那霉素的ＭＳ培养基上选择转化子和植株再生,通过ＰＣＲ检测从抗卡那植株中选到１５株转基因植株,Ｓｏｕｔｈｅｒｎ杂交分析初步确证了外源基因是以单拷贝插入到杨树基因组ＤＮＡ中;对杨树幼苗乙烯释放的测定结果表明转基因杨树幼苗的乙烯释放量为对照的２２％。     

在碱茅和芦苇草地中防除刺儿菜药物筛选试验结果

在碱茅和芦苇人工草地中喷施不同量的甲黄隆、绿黄隆和阔叶净均可有效防除有害杂草刺儿菜（Ｃｉｒｓｉｕｍｓｅｔａｓｕｍ）。刺儿菜的株防效和鲜重防效均与施药量呈正相关。以喷施甲黄隆（２５％）２２．５ｇ／ｈｍ２或绿黄隆（２５％）４．５ｇ／ｈｍ２最好．     

黄河流域传统果园发展现状及旅游发展潜力分析

全国重要农业文化遗产系统构成了令人叹为观止的优美人文景观,展现着传统农业生态多样性、生态系统适应性和珍贵的文化遗产。这些世代相传的农业系统构成了当代和未来农业创新和技术的基石。已公布的37个传统果园类全国重要农业文化遗产地,有14个沿黄河流域分布,是我国果业重要的发源地。拟以黄河流域的传统果园为研究对象,系统梳理其发展历史、现状及传统果园农耕系统,同时重点分析黄河流域主要果品的区位发展优劣势,最后结合传统果园的人文价值和区域经济发展因素等,综合探索传统果园的传承和利用途径,为我国果业发展提供传统农业系统和技术创新基础,也为传统果园的保护和传承发展以及农业管理部门挖掘和健全果园文化遗产保护机制提供参考。     

4种黄酒基本营养成分的检测与比较

摘要:目的：为了开发灵芝黄酒,并提高南阳黄酒的知名度,本文测定了绍兴黄酒、南阳黄酒、和两种灵芝黄酒中基本营养元素的含量,并对其含量进行了比较。方法：用氨基酸自动分析仪对四种黄酒中的17种氨基酸进行了全面的定量分析;利用荧光法对四种黄酒中的维生素B1、维生素B2进行了定量分析;采用2,4-二硝基苯肼法检测不同黄酒中的维生素C的含量。结论：四种黄酒在基本营养成分含量上各有所长。     

Greenhouse gas emissions in response to straw incorporation,water management and their interaction in a paddy field in subtropical central China

A field experiment was conducted to study the effects of combination of straw incorporation and water management on fluxes of CH₄, N₂O and soil heterotrophic respiration (Rh) in a paddy field in subtropical central China by using a static opaque chamber/gas chromatography method. Four treatments were set up: two rice straw incorporation rates at 0 (S1) and 6 (S2) t ha^?1 combined with two water managements of intermittent irrigation (W1, with mid-season drainage) and continuous flooding (W2, without mid-season drainage). The cumulative seasonal CH₄ emissions for the treatments of S1W2, S2W1 and S2W2 increased significantly by 1.84, 5.47 and 6.63 times, respectively, while seasonal N₂O emissions decreased by 0.67, 0.29 and 1.21 times, respectively, as compared to S1W1 treatment. The significant increase in the cumulative Rh for the treatments S1W1, S2W1 and S2W2 were 0.54, 1.35 and 0.52 times, respectively, in comparison with S1W2. On a seasonal basis, both the CO₂-equivalents (CO₂e) and yield-scaled CO₂e (GHGI) of CH₄ and N₂O emissions increased with straw incorporation and continuous flooding, following the order: S2W2>S2W1>S1W2>S1W1. Thus, the practices of in season straw incorporation should be discouraged, while mid-season drainage is recommended in paddy rice production from a point view of reducing greenhouse gas emissions.