铁在苹果树器官中的定量研究   总被引：1，自引：0，他引：1  

田自武  薛进军  张福锁  李绍华  牛新胜 《果树学报》2001,18(2):65-67

成龄苹果树整株分析结果表明 ,果实、叶片、枝干、根系的鲜重分别占整株鲜重的 42 .0 9%、6 .33%、38.81%、12 .77% ,以果实占鲜重的比例最大 ,单株鲜重为 2 0 7.90kg ;果实、叶片、枝干、根系的干重分别占整株干重的 19.5 1%、6 .45 %、5 7.30 %、16 .75 % ,以枝干占干重的比例最大 ,单株干重 84.37kg ,单株含水量 12 3.5 5kg。铁浓度以直径 <0 .5cm的根最高 ,达 2 5 7.5 1mg/kg ,其次为叶片 ,达 2 14.0 9mg/kg ,果实中铁浓度最低 ,为 18.2 7mg/kg;单株总铁含量 4915 .78mg,叶、果、根、枝干中铁含量分别为 116 4.6 5、30 0 .72、15 0 0 .30、1949.6 0mg ,分别占单株总铁量的2 3 .70 %、6 .12 %、30 .5 2 %和 39.6 6 %。  相似文献   

A Potential Screening System for Identifying Sorghum Ecotypes with Increased Lysine in the Seeds     

S. Vernaillen    F. Laureys  M. Jacobs 《Plant Breeding》1993,111(4):295-305

Classical “high-lysine” sorghum lines are characterized by smaller seeds than average, due to a decrease in prolamin synthesis and a subsequent decrease in yield. To exploit the natural variation in lysine content and to identify ecotypes with a seed lysine content higher than average, characterized by plump seeds, a method was developed based on root-growth inhibition of seeds growing on a medium containing aminoethylcysteine (AEC), a lysine analogue. By using a collection of sorghum mutants and ecotypes a correlation coefficient of 0.926 between root length and lysine content was established. This method, which uses the root length of plants growing on aec to indicate which lines have a potential elevated lysine content, can be applied for the screening of sorghum germplasm. Since this is a non-destructive method it can also be used at the individual seed level, for example for screening progenies of regenerated plants from in vitro culture to exploit the somaclonal variation.  相似文献   

DYNAMIC MODELS OF AQUIFEROUS CONTENT OF LIVING FUELS     

罗光裕 《林业研究》1994,5(1):41-44

RESEARCHSITELivingfue1splayedanimportantroleinheatconcentrationactionorinheatsourceofforestfire.Whenitshumiditydecreasestoacertainlevel,theybecameaheatsourcewhenthelivingcombustibl-eswerecombinedwithfire.Thus,itwasessentialhowtodeterminethemoisturesituationandthefOrestfiredangerdegreetobeforecastedaccurately.Thedynamicmodelspresentedinthispaperwereusefultosolvethisproblem.Everyyear,-therewerealotofforestfires,especiallythefireoccurrenceinDaxinganMountains,inthespringofl987.Itwasveryimpo…  相似文献   

低聚糖对雏鸡大肠粪便NH3-N含量及肠道菌群的影响   总被引：11，自引：0，他引：11  

王宝维  任慧英  朱新产  史美丽  王述柏  葛文华  刘光磊 《中国家禽》2003,25(8):8-10

试验选取1日龄罗曼蛋公雏250只，随机分为5组，试验组饲料或饮水中分别添加海藻糖(500mg／kg)、海藻胶(600mg／kg)、大豆寡糖(500mg／kg)、圆葱寡糖(500mg/d)。结果表明，四种低聚糖均可促进肠道乳酸菌及双歧杆菌的生长繁殖，对魏氏梭菌的生长呈现抑制作用。海藻糖、海藻胶对降低大肠粪便NH3—N含量效果不显著(P＞0．05)，而大豆寡糖效果显著(P＜0．05)，圆葱寡糖效果极显著(P＜0.01)。  相似文献   

高生物钙线椒新品种“陕椒2001”     

庄灿然 《辣椒杂志》2003,(4)

线辣椒为陕西省的传统名优特品种。也是唯一能在全国起拳头的出口创汇产品。因其具有“果色鲜红和品佳味香”的特点,在国  相似文献   

Nutrient digestibility of angling baits for carp, Cyprinus carpio, with implications for groundbait formulation and eutrophication control     

R. ARLINGHAUS  & M. NIESAR 《Fisheries Management and Ecology》2005,12(2):91-97

Abstract  To evaluate the suitability of angling groundbaits as a fish feed and the potential for nutrient loss, the macronutrient digestibility of four groundbaits was investigated in carp, Cyprinus carpio L., using a sieving method of faeces collection and chromic oxide. Apparent digestibility coefficients (ADCs) of protein and lipids were >80% for all angling baits. ADCs of nitrogen-free extracts and phosphorus (P) differed significantly between the test diets, probably because of divergent feed compositions and ingredient treatments. The generally high digestibility estimates indicated that fish feeding on angling groundbait will benefit from this food source. The differences in nutrient digestibility suggested that type of groundbait and ingredient used will have a major effect on potential eutrophication and fish production caused by groundbaiting. The principle of groundbaits to protect the environment should be to minimise the P-content of the groundaits and maximising P-digestibility and P-retention efficiency.  相似文献   

施肥对红三叶群落营养元素含量和积累量的影响   总被引：1，自引：0，他引：1  

杜占池  钟华平 《四川草原》2001,(4):14-16

本文研究了施肥对红三叶群落地上部和地下部 1 0种营养元素的影响 ,结果如下 :( 1 )从含量看 ,施氮肥后 ,地上部B明显降低 ,地下部B明显升高 ;施磷肥后 ,地上部N、B显著下降 ,地下部K、P、N上升幅度较大。 ( 2 )就积累量而言 ,施氮肥后 ,地上部大多数元素增高 ,地下部多数元素降低或无变化 ;施磷肥后 ,无论地上部还是地下部 ,大多数元素均有所增高  相似文献   

植物在水分胁迫下脯氨酸积累的研究─—Ⅳ关于植物体内脯氨酸积累的直接触发因子     

马宗仁 《草业科学》1994,(1)

依据干旱胁迫下数种植物幼苗体内游离脯氨酸、叶气孔、叶水量的变化，剖析了植物与环境因子、气孔因子、氧气因子、酶因子及能量因子之间的相互依存关系，提出了ＰＲＯ积累系统（ＰＡＳ）。认为水分胁迫下植物体内ＰＲＯ的大量积累是氧化受抑和合成受激共同调控的结果。氧气最有可能为直接触发因子。  相似文献   

Stoffbildung, CO₂-Gaswechsel, Kohlenhydrat- und Stickstoffgehalt von Winterweizen bei erhöhter CO₂-Konzentration und Trocken-streß     

J. Müller 《Journal of Agronomy and Crop Science》1993,171(4):217-235

Dry Matter Production, CO₂ Exchange, Carbohydrate and Nitrogen Content of Winter Wheat at Elevated CO₂ Concentration and Drought Stress
Methods of mathematical modelling and simulation are being used to an increasing degree in estimating the effects of rising atmospheric CO₂ concentration and changing climatic conditions on agricultural ecosystems. In this context, detailed knowledge is required about the possible effects on crop growth and physiological processes. To this aim, the influence of an elevated CO₂ concentration and of drought stress on dry matter production, CO₂ exchange, and on carbohydrate and nitrogen content was studied in two winter wheat varieties from shooting to milk ripeness. Elevated CO₂ concentration leads to a compensation of drought stress and at optimal water supply to an increase of vegetative dry matter and of yield to the fourfold value. This effects were caused by enhanced growth of secondary tillers which were reduced in plants cultivated at atmospheric CO₂ concentration. Analogous effects in the development of ear organs were influenced additionally by competitive interactions between the developing organs. The content and the mass of ethanol soluble carbohydrates in leaves and stems were increased after the CO₂ treatment and exhausted more completely during the grain filling period after drought stress. Plants cultivated from shooting to milk ripeness at elevated CO₂ concentration showed a reduced response of net photosynthesis rate to increasing CO₂ concentration by comparison with untreated plants. The rate of dark respiration was increased in this plants.  相似文献   

改善E1级胶合板用UF胶粘剂预压性能的研究   总被引：1，自引：0，他引：1  

焦德贤  唐朝发 《吉林林业科技》2005,34(5):45-47

利用氧化淀粉在树脂合成后期、API在调胶时加入分别对脲醛树脂进行改性，探讨改性UF对胶合板预压强度的影响。采用正交实验法对比改性后胶合板的预压性能和改性后胶合板的甲醛释放量的变化。结果表明：随着API量的加大，胶合板的预压性能得以提高；而氧化淀粉改性后则随着量的加大，一定范围内胶合板的预压性能得以提高，加入量继续加大后反而下降。  相似文献