苗期遮阴对凤丹白牡丹光合特性的影响

在大田条件下研究不同遮阴程度对凤丹白(牡丹)苗期光合特性和叶绿素荧光参数的影响。结果表明:在夏季晴天、自然光照条件下,凤丹白苗期的光合速率日变化表现为"双峰型",有明显的"光合午休"现象,净光合速率显著低于遮阴处理;当年生苗遮阴75%条件下,净光合速率没有出现"光合午休"现象,2年生苗遮阴60%条件下,净光合速率显著高于其他处理。自然光照条件下,2年生苗的最大净光合速率和表观量子效率显著高于1年生苗。经过遮阴处理的F_v/F_m均显著高于全光照植株。试验结果说明:夏季大田中午强光、高温条件下,凤丹白幼苗光合作用受光抑制显著,遮阴可有效减轻光抑制,综合比较各参数可知,遮阴60%最适合凤丹白播种苗的生长。     

加拿利海枣在江汉平原的引种试验

以大田栽培的加拿利海枣为研究对象,选择幼苗成活率及新抽生的叶片数、茎的增长幅度、病虫害感染率等指标,评价了其在引种地的综合适应能力,并提出了培育加拿利海枣壮苗的栽培管理技术措施。     

南涧凤凰山鸟类环志初步研究

南涧凤凰山自古以来就是鸟类迁徙的重要通道,1999年正式开展鸟类环志工作,以夜间张网,捕捉鉴定,上环并详细记录后释放。至2003年,共环志鸟类17 977只,228种,隶属13目,27科,(含4亚科)。其中国家Ⅱ级保护鸟类11种,在云南有重要经济、科研价值的鸟类4种,分析了凤凰山鸟类迁徙规律。     

新乡凤凰山森林公园景观规划与生态恢复研究

废弃地改造与复建是现代景观规划与生态建设的一大重要课题。以新乡凤凰山废弃地的保护与生态恢复为研究内容,用SWOT方法进行现状分析,提出凤凰山森林公园规划建设的指导思想,进行初步景观规划,根据不同特色将项目区规划为11个分区,同时提出通过土壤改良和植被恢复进行生态恢复。为其他地区的废弃地景观保护与复建提供一定参考。     

Electrophoretic patterns of acid soluble proteins and active isoforms of peroxidase and polyphenoloxidase typifying calli and somatic embryos of two reputed date palm cultivars in Morocco

Summary When subjected to micropropagation by tissue culture, the two reputed cultivars of date palm (Phoenix dactylifera L.); Bou-Sthammi noire, resistant to Bayoud disease and Bou-Feggous, of high fruit quality, give rise to three types of calli, called white and root-forming callus, hyperhydric and degenerating callus and friable and embryogenic callus. All explant sources, calli and germinated embryos were analysed by denaturing polyacrylamide gel electrophoresis (SDS-PAGE) for acid soluble protein composition. Phenol-oxidizing enzymes; peroxidase and polyphenoloxidase, were also, evaluated and the isoforms separated by polyacrylamide gel electrophoresis. When compared with the explant and germinated embryos, embryogenic calli of the two date palm cultivars could be identified by a concentrated polypeptide of molecular weight 27 500 and polypeptides of molecular weights 70 000 and 11 500. Hyperhydric and degenerating callus contained the polypeptide exhibiting the molecular weight 32 000. Embryogenic calli showed high levels of soluble, ionically and covalently bound peroxidases. The soluble acidic isoperoxidase of R _f 0.60, revealed in these calli and germinated embryos could be a marker of the two tissues. White and root-forming calli of Bou-Feggous cultivar were typified by soluble acidic isoperoxidases with high mobility (R _f 0.75) and anodic ionically wall-bound polyphenoloxidases similar to those of the explant sources. Polyphemoloxidase activities detected in calli and embryos were very low when compared with those of explants. Used as an early test to screen embryogenic calli of date palm, acid soluble proteins, peroxidase and polyphenoloxidase data could lead to introduce lightening and economy in the tissue culture technique.     

Genetic Diversity of the Date Palm (Phoenix dactylifera L.) from Algeria Revealed by Enzyme Markers

Analysis of the enzymatic polymorphism of the date palm, Phoenix dactylifera L., was undertaken to evaluate the genetic variability of Algerian cultivars. Seven enzyme systems (alcohol dehydrogenase, diaphorase, aspartate aminotransaminase, acid phosphatase, endopeptidase, leucine aminopeptidase and phosphoglucomutase) were visualized by electrophoresis. Genetic hypotheses appear to show 7 polymorphic loci and 16 alleles were counted. The study of diversity showed a high percentage of polymorphic loci, strong heterozygosity and considerable genetic diversity. The study shows that genetic variability is greater in the cultivars in the western regions (Saoura-Touat) than in the eastern regions (Rhir-Zibans). An identification key was devised and nearly 65% of the cultivars studied were identified from 5 enzyme systems.     

日粮氨基酸平衡条件下大午金凤商品代蛋鸡产蛋高峰期粗蛋白质需要量研究

本试验通过研究日粮粗蛋白质（CP）水平对大午金凤商品代蛋鸡产蛋高峰期生产性能和蛋品质的影响,确定其CP需要量。试验选取31周龄大午金凤商品代蛋鸡480只,随机分入4个处理组,每组12个重复,每个重复10只蛋鸡,4个处理CP水平分别为13.5%、14.5%、15.5%、16.5%。预试期7 d,正试期63 d。试验期间每天记录蛋鸡产蛋数、蛋重和不合格蛋数,每2周以重复为单位统计采食量,计算平均日采食量（ADFI）和料蛋比（F/E）;试验第6周时,每个重复取3枚鸡蛋测定蛋品质。结果表明：①日粮CP水平对蛋鸡日产蛋量、日采食量、料蛋比有显著影响（P<0.05）。16.5% CP组的日产蛋量、平均日采食量均显著高于13.5%和14.5% CP组（P<0.05）,且随着日粮CP水平的提高日产蛋量呈线性增加（P<0.05）;16.5% CP组的料蛋比显著低于13.5%、14.5%和15.5% CP组（P<0.05）。②日粮CP水平对蛋壳占比、蛋黄颜色有显著影响（P<0.05）,13.5% CP组的蛋壳占比显著高于16.5% CP组（P<0.05）,且随着日粮CP水平的提高呈线性降低（P<0.05）;13.5% CP组的蛋黄颜色显著高于16.5% CP组（P<0.05）,且随着日粮CP水平的提高蛋黄颜色呈线性降低（P<0.05）。建立料蛋比与日粮CP水平之间的回归曲线（y＝275x²-86.4x+8.7356）,经计算,获得最小料蛋比的日粮CP需要量为15.7%。结合本试验生产性能和蛋品质,推荐大午金凤商品代蛋鸡产蛋高峰期CP需要量为15.7%。     

Physicochemical changes in Mazafati date fruits incubated in hot acetic acid for accelerated ripening to prevent diseases and decay

A method was developed and optimized for the accelerated ripening of date fruits of cultivar ‘Mazafati’ to prevent diseases and decay. The date fruits were incubated in hot acetic acid solution 0.5% at 40 + 1 °C for 72 h. During the process some physicochemical changes in the fruits were studied and were found to be comparable with the changes in the fruits that naturally ripened on the tree. Fruit firmness, water insoluble solid (WIS), protein, pH, L*a*b* and E decreased during accelerated ripening whereas in control samples at 4 °C increased. Total solid (TS), total soluble solid (TSS) and acidity were slightly higher in treated fruits compared to control fruits. The greatest loss of fruit firmness occurred during the first 12 h of incubation. Organoleptic tests also showed little difference between the naturally ripened fruits on trees and accelerated ripened fruits in hot acetic acid. Overall there was no difference between the fruits and were readily acceptable to consumers.     

梧桐的历史传说与栽培史

本文主要论述了梧桐的名实考证,梧桐的传说及其文化含义,历史上利用梧桐栽培的历史。     

凤凰沱茶品牌建设与商标保护的探讨

凤凰沱茶是云南省大理州南涧县所产的主要普洱茶产品,具有一定的品牌效应.但由于生产企业众多,市场处于恶性竞争的状态,对凤凰沱茶的市场地位和声誉造成了很大的冲击.本文从南涧县凤凰沱茶生产的历史及现状出发,对凤凰沱茶的品牌建设与商标保护进行探讨