桉树不同成熟度叶片营养元素内循环特征     

吉玉  田湘  张雨蒙  吴庆标 《森林与环境学报》2021,(3):242-247

揭示桉树人工林不同成熟度的叶片器官所需营养元素变化以及土壤肥力对其影响,对于桉树营林和科学施肥具有重要的生产指导意义。选取广西隆安县小林镇和田东县思林镇的桉树2代萌芽林作为研究对象,测定两个人工林嫩叶、成熟叶、黄叶的C、N、P、K、B、Ca、Mg以及土壤C、N、P、K、Ca、Mg元素含量,并进行相关分析。结果表明,植物叶片的N、P、K、Mg营养元素转移规律是黄叶向成熟叶和嫩叶转移,但C、Ca、B营养元素则是随着叶片的生长发育逐渐积累,黄叶中含量最高,说明施肥时应关注Ca、B元素的持续和有效供给。两片人工林都表现出类似的规律,说明土壤肥力的差异不影响桉树人工林叶片营养元素的内循环规律。桉树嫩叶营养元素含量及其生态化学计量比学特征具有与成熟叶和黄叶不同的表征,在营养物质研究中应予以足够重视。  相似文献   

弘扬茶文化 促进社会主义和谐社会建设   总被引：1，自引：0，他引：1  

晏嫦妤  黄静  赵超艺  卓敏 《茶叶通讯》2009,36(4):44-45,48

中国是茶的故乡,是世界上茶历史最悠久、茶资源最丰富、茶文化最深厚的国家.茶在中国始终扮演着社会交往的最佳礼物和媒介,是人与人之间友谊的桥梁.茶文化的本质是"和谐文化",它引导人们与自然和谐相处,启示人们在人与人的关系上,要彼此尊重,加强交流,启发人们感悟身心的统一.大力弘扬茶文化精神,是建设和谐文化的一笔重要资源,是构建和谐社会的重要载体.  相似文献   

汝城白毛茶种群个体间亲缘关系的RAPD分析   总被引：3，自引：0，他引：3  

黎星辉  刘春林  施兆鹏  罗军武  沈程文  龚志华  陈暄 《茶叶科学》2004,24(1):33-36

采用RAPD技术,对汝城白毛茶种群个体间的亲缘关系进行了分析。研究结果:汝城白毛茶种群个体单株扩增的谱带数最多时为13条,最少时为10条;DNA多态性最高为92.31%,最低为70.00%,平均为85.40%。结果表明汝城白毛茶种群呈现丰富的遗传多样性。汝城白毛茶种群单株间的遗传距离最小为0.0882,最大为0.5791。聚类分析结果表明汝城白毛茶种群中有些单株聚类很近,遗传基础比较一致,有些聚类较远,显示其丰富的遗传多样性。研究发现种群单株间的遗传变异呈现连续性,当结合距离I为0.14时,汝城白毛茶种群可分为6个类型,这与其表观形态类型相符。本文运用分子生物学方法证明汝城白毛茶的核心种质基因群在汝城县白毛茶示范场得到了有效保护。  相似文献   

A method to test wheat leaves for their reactions to inoculation with Septoria species     

E. Ubels 《European journal of plant pathology / European Foundation for Plant Pathology》1979,85(3):143-150

The construction and application is described of a polystyrol humidity box in which wheat leaves, while continuing to function as parts of living plants, can be tested for their reactions toSeptoria spp. in an atmosphere nearly saturated with water, as is required for successful infection. The method is simple, accurate ans inexpensive.Samenvatting Voor dit doel is een z.g. vochtdoos geconstrueerd (Fig. 1A). Het te toetsen blad wordt daar doorheen geleid en in de doos geïnoculeerd met een druppel conidiën-suspensie van de schimmel. Onder het blad staat wat water in de doos (Fig. 1B). Na afsluiting ontstaat in de doos de hoge luchtvochtigheid van bijna 100% die nodig is voor de infectie. Dit wordt op deze wijze eenvoudig en goedkoop gerealiseerd. De bladeren die zo worden getoetst blijven onbeschadigd functioneren aan de plant. Na enkele dagen kan de doos worden geopend en kan de symptoom-ontwikkeling worden afgewacht en gevolgd (Fig. 3A, 3B en 4). De methode leent zich voor nauwkeurig werk en vereist zeer weinig infectiemateriaal. De Technische en Fysische Dienst voor de Landbouw (TFDL), Wageningen, ontwierp en construeerde een statief voor het gebruik van de vochtdozen in serie (Fig. 2).  相似文献   

Impact of environmental factors on infestation of tea leaves byHelopeltis theivora, and associated changes in flavonoid flavor components and enzyme activities     

U. Chakraborty  N. Chakraborty 《Phytoparasitica》2005,33(1):88-96

Attack of tea plant (Camellia sinensis (L.) O. Kuntze) leaves by the tea mosquito bugHelopeltis theivora (Hemiptera: Miridae) was positively correlated to temperature and rainfall, and partially to humidity, as determined in 12 varieties during the period 2000–2002. The insect attack was severe during the months of May–September, which had high temperature and rainfall, and led to severe loss of biomass due to curling and drying up of the leaves. The biochemical response of these 12 varieties of tea to attack by the insect was determined with special reference to oxidative enzymes and flavonoid flavor components. Insect attack led to an increase in the activities of the oxidative enzymes peroxidase, ascorbate peroxidase and polyphenol oxidase. Activities of phenyl alanine ammonia lyase generally decreased as a result of insect attack, which was significant in the United Planters Association of South India (UPASI) varieties. A significant decrease in polyphenols was also obtained in UPASI varieties. HPLC analysis of catechins revealed a decrease in some of the catechins in the infected leaves. Analysis of theaflavins from infusion of healthy andHelopeltis-infested tea leaves revealed no changes. http://www.phytoparasitica.org posting Dec. 19, 2004.  相似文献   

芒果叶片生化特性与炭疽病发生的关系   总被引：1，自引：0，他引：1  

蒲金基  王向社  梁活华  刘晓妹 《果树学报》2004,21(5):434-437

研究了芒果叶片生化特性与炭疽病发生之间的关系。田间自然发病调查和室内人工接种鉴定结果均表明,随着芒果叶片由最初的古铜色向淡绿色和深绿色叶片的逐渐成熟老化,抗病性逐渐增强。对芒果叶片表面蜡质层和叶内可溶性糖、游离氨基酸、总酚含量及细胞膜相对透性的测定结果表明,与淡绿色叶片和老叶相比较,古铜色叶片含有较少的表面蜡质、叶内可溶性糖和总酚含量及较多的游离氨基酸,推断古铜色叶片对病害的易感性可能与其叶面蜡质和叶内总酚含量较少、叶内可溶性糖和游离氨基酸的比值(C/N比)较低有关。  相似文献   

Polyphenols in Eucalyptus leaves improved the egg and meat qualities and protected against ethanol‐induced oxidative damage in laying hens          下载免费PDF全文

W. Li  J. Miao  N. Chen  X. Shao  Y. Cao 《Journal of animal physiology and animal nutrition》2018,102(1):214-223

Polyphenols in Eucalyptus leaves (PE) were value resources due to various pharmacological activities, but data on the effect on laying hens are very scare. This study was conducted to determine the effect of PE on the laying performance, egg traits, meat quality, antioxidant status and liver tissues of laying hens. One hundred and twenty 256‐day‐old Yueqinhuang laying hens were randomly assigned to four treatment groups (different levels of PE at 0, 0.5, 0.8 and 1.2 g/kg diet) for 63 days with 15 replicates per group. Addition of 0.8 g/kg PE not only improved the egg trait by increasing the eggshell thickness and decreasing MDA production and cholesterol content in the egg yolk, but also significantly enhanced meat quality of hens, as suggested by the increase pH_45 min (p < .01) and a* value, and decrease drip loss rate (p < .01). Meanwhile, under acute ethanol‐induced oxidative damage condition, supplementation of 0.8 g/kg PE enhanced the serum antioxidant status by increasing enzymatic activities (GSH‐PX, T‐SOD, T‐AOC), inhibited oxidative damage and provided protective effect to liver tissue. In conclusion, addition of 0.8 g/kg PE not only improved the egg traits and meat quality without obvious adverse effects, but also increased the serum antioxidant status of the hens and protected their liver tissue from ethanol‐induced oxidative damage. This study indicated that PE could be utilized as an effective feed additive for laying hens to improve health performance and egg traits.  相似文献   

Effect of Different Concentrate-roughage Ratios on Rumen Degradability of Cassava Stems and Leaves Total Mixed Ration in Goat   总被引：1，自引：0，他引：1  

HU Lin  WANG Ding-fa  LI Wei  ZHOU Lu-li  LI Mao  ZHOU Han-lin 《中国畜牧兽医》2016,43(11):2914-2921

The rumen degradations of TMR were studied in this experiment,in which cassava stems and leaves were used as roughage and formulated with concentrate in different proportions.The purpose of this study was to formulate the available TMR for finishing goat,and provide a theoretical basis for the applications of cassava stems and leaves in goat production.Six Hainan Black goats with permanent rumen fistulas were selected,the rumen degradabilities of DM,CP,NDF and ADF of TMR with 6 different concentrate to forage ratio（2:8,3:7,4:6,5:5,6:4 and 7:3）were tested using nylon bag method.The results showed that,the DM effective degradabilities at the ratio of 4:6,5:5,6:4,7:3 were significantly higher than that of 2:8 and 3:7（P<0.05).CP effective degradabilities at the ratio of 2:8,3:7,4:6 were significantly higher than that of 5:5,6:4 and 7:3（P<0.05).The NDF effective degradation at the ratio of 5:5 was significantly higher than that in the other groups（P<0.05).The ADF degradation at the ratio of 3:7 was significantly higher than that of 4:6,5:5, 6:4 and 7:3（P<0.05).The results indicated that,the nutrient degradation in rumen were higher when the concentrate to forage（cassava stems and leaves）ratio in TMR were 3:7,4:6 and 5:5,and the recommended ratio range were 4:6 to 5:5 in production practice.  相似文献   

保靖黄金茶产业现状及发展建议     

杨晓春  张明照 《茶叶通讯》2011,38(2):33-35

保靖黄金茶是保靖县古老而珍稀的特异地方优质名茶,独具"香、绿、爽、浓"的优异品质.为充分发挥资源优势,现就保靖黄金茶产业现状和存在的问题,提出保靖黄金茶产业发展的建议.  相似文献   

海南省儋州市两院地区茶树蜘蛛种类调查     

吴斌彬  林娜 《安徽农业科学》2015,(36):33-34

[目的]为茶园生态防治做基础性调查。[方法]采用形态对比法,对海南省儋州热作两院地区茶园蜘蛛种类进行调查。[结果]经初步鉴定,明确有蜘蛛共42种,分别属于12科30属,其中5种鉴定到属,另有4种只鉴定到科,未列入其中。[结论]该次调查仅做种类鉴定,但鉴于蜘蛛在生态防治上的重要性,有必要做进一步的调查。  相似文献