不同行距配比对玉米光合生理指标及茎秆特性的影响

以‘大丰30’为试验材料,在同一密度下（75000株/hm²）设置5种不同行距配比,研究不同行距配比对玉米光合生理指标及茎秆力学特性的影响。结果表明：行距配比为40 cm×80 cm时,棒三叶的叶绿素含量(SPAD)在灌浆期达到峰值;行距配比为30 cm×90 cm时,棒三叶净光合速率在灌浆期最高。大口期开始,行距配比为40 cm×80 cm时,叶面积指数(LAI)最高。单株干物质积累量以40 cm×80 cm最高。各行距配比的茎秆硬皮穿刺强度与茎秆弯曲性能随着节位的下降均呈逐渐增强的趋势,从大到小为 40 cm×80 cm>50 cm×70 cm>30 cm×90 cm>60 cm×60 cm>20 cm×100 cm。穗长、穗粗、千粒重和穗粒数各处理间均有不同变化,行距配比为40 cm×80 cm时产量最高,比等行距60 cm×60 cm增产7.96%。由此可见,行距配比为40 cm×80 cm,有利于大穗型品种‘大丰30’的光合性能和茎秆强度的提高,从而达到抗倒伏增产的目的。     

圈养华南虎血液生化指标正常参考值初步研究

以国内部分圈养的健康华南虎Panthera tigris amoyensis作为研究对象,通过收集华南虎血液生化报告和采集华南虎血液样本检测建立样本数据,血样检测采用自动血液生化分析仪干式试剂片生化技术测定,测定血液生化指标包括血糖(GLU)、总蛋白(TP)、总胆固醇(CHOL)、总胆红素(TBIL)、肌酐(CREA)等。得到华南虎血液生化共38项指标的正常参考值范围(95%概率),其中几项主要指标正常值范围如下:GLU(2.82-11.55)mmol/L、TP(56.58-85.93)g/L、CHOL(3.32-8.66)μmol/L、TBIL(0-5.30)μmol/L、CREA(52-349)μmol/L等。统计结果显示,雌雄华南虎间血液生化指标的部分项目有差异(P <0.05),幼龄组和成年组间各项生化指标差异不显著(P >0.05),与其他虎亚种相关血液生化报道的生化指标部分有差别。华南虎血液生化指标正常参考值范围不同于其他虎亚种,建立华南虎血液生化指标正常值对华南虎的饲养管理、疾病诊治预防和保育繁殖研究工作有重要作用。     

放牧牦牛采食量和几种消化生理指标的测定

在莎草科 +禾本科草地上对放牧条件下牦牛采食量和几种消化生理指标进行测定。结果表明 :牦牛的干物质消化率为 69 3 6%± 5 87% ,放牧牦牛日干物质采食量为 12 2 13g/kg·W0 75,大部分食糜在采食后 60小时左右排出 ,但完全排出要在 5天以后     

Studies on Tomato Seedling Quality Indices Under Simulated Shipping and Storage Conditions

Indices of the tomato seedling quality maintenance level after production before field planting were studied through simulated experiments, small--scale operation, indoor analyses and measurements, and field observation. The results showed that under simulated shipping and storage conditions, seedling quality change following different durations (days) of shipping and storage was correlated significantly or even very significantly with certain physiological and morphological indices. With various measured indices following different periods of shipping and storage treatment subjected to multinomial successive regressive correlation analysis, the principal factors influencing seedling quality maintenance level are identified to be chlorophyll content→dry short weight→ leaf freshness index in order of their importance. Significance analysis with multinomial fitted equation indicated that correlations between any one of above three factors and the growth index after field planting reached very significant difference level.     

安普霉素对仔猪内分泌的调控作用及血液生化指示的影响

采用单因子试验设计 ,28日龄大长北三元杂交断奶仔猪72头随机分为3组 ,研究饲料中添加不同剂量的安普霉素 (0、20、90mg/kg)对仔猪内分泌的调控作用及血液生化指标的影响。试验期为4周。结果表明 :仔猪日粮中添加90mg/kg的安普霉素可促进机体与生长有关的内分泌活动 ,提高内源激素 (生长激素、胰岛素、甲状腺激素T3)水平 (P<0.05),从而促进肌肉蛋白沉积 ;并具有显著降低血液中氨、尿素氮含量和提高血糖水平的作用 (P<0.05) ,表明安普霉素对仔猪具有增加氮沉积 ,促进蛋白质合成、抑制蛋白质分解的作用     

多肽生长因子生理功能的研究进展

多肽生长因子作为动物体细胞分泌的活性物质，具有重要的生理功能，其抗体对肿瘤也具有良好的抑制效果。本文对七种多肽生长因子在生理功能方面的研究进展做一综述。     

Physiological Indices and Selection of Methods on Rapid Identification for Sweet Potato Drought Resistance

The relationships between the changes of relative water content （RWC）, malondialdehyde （MDA） contents, superoxide dismutase （SOD） activity and free proline contents in sweet potato leaves, and drought resistant ability under different concentration of polyethylene glycol （PEG） treatment applied at rhizosphere of sweet potato seedlings were studied. A highly positive correlation between RWC and drought resistance （r =0.783, P〈0.01）, a highly negative correlation between MDA contents and drought resistance （r = -0.848, P〈0.01）, a highly positive correlation between SOD activity and drought resistance （r = 0.777, P〈0.01） was observed. Free proline contents in leaves was not related obviously to the sweet potato drought resistance under 25% PEG treatment. The stronger the drought resistance of variety, the less decrease of RWC and increase of MDA contents, the more increase of SOD activity. By determining these physiological indices in sweet potato leaves under 25% PEG treatment, rapid identification of drought resistant ability of different varieties can be obtained in the lab.     

江西省主要人工混交林类型的优化与筛选

以杉木或湿地松为主要树种,用南酸枣、檫树、樟树、乐昌含笑、福建柏、鹅掌楸、蓝果树等作伴生树种,开展了13个类型的混交林试验研究,在定性分析筛选的基础上,初选出9个比较优良的混交类型,再依据Ii=P1h/H+P2d/D+P3v/V计算出混交类型的优选指标,用I标准=I单均+aδn计算出类型的优化标准为6.12.据此对参试的混交类型进行优选,选出的最佳混交类型为杉木+南酸枣、杉木+檫树、杉木+樟树和湿地松+鹅掌楸4个混交类型,供林业生产上推广应用.     

夏大豆亩产262.1kg生理指标研究

研究了夏大豆中油－８９Ｄ亩产２６２．１ｋｇ各项生理指标：叶面积系数，开花期、结荚期、鼓粒期分别为３．９８、５．８０、４．９１；总光合势１８．２万ｍ＾２·日，平均净光合生产率４．８１ｇ／ｍ＾２·日，氮磷总积累量分别为２２．２８ｋｇ和３．１３ｋｇ，每生产１００ｋｇ籽粒需吸收氮８．５０ｋｇ，磷１．１９ｋｇ，总干物质积累８７６．４７ｋｇ，粒茎比０．５１，经济系数０．３０。     

林木抗旱性生理指标及其在干旱区造林中应用研究

<正> 中国干旱半干旱区面积占全国面积的52.5%,半壁河山是以水分胁迫为主导限制因子的特殊生态区。为了提高这一地区的造林质量,选择旱生和抗旱性强的树种造林是主要造林技术之一。对于如何评价和比较林木的抗旱性,传统方法多采用对林木生态环境因子及对林木生