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对贵州道地苗药对对参生长立地环境、气候状况、土壤理化特性及蕴藏量进行研究,研究结果表明:对对参生长在中缓坡地带或较陡山坡上的小块平洼地;岩石较多,岩土比达1:1以上;对对参生长地区气候温和、降雨充沛、阳光充足、热量资源丰富;土壤有机质含量高,有良好的团粒结构;土壤水分含量高;土壤呈弱碱性;土壤养分中氮元素的含量丰富,而速效磷、钾的含量则较少;表明对对参是一种喜阳、喜热、喜湿及喜氮的植物;对对参资源蕴藏量少. 相似文献
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广西青天葵野生资源现状 总被引:1,自引:0,他引:1
以走访调查和实地调查相结合的方法对青天葵野生资源在广西的分布、药材品种、群落特征、资源蕴藏量等情况进行了调查。结果表明:青天葵在广西主要分布在石灰岩地区,其药材品种按商品规格分为小叶和大叶2种,小叶青天葵为该文的调查对象毛唇芋兰,大叶青天葵为同属植物毛叶青天葵,亦当作青天葵出售和使用;青天葵生长群落结构在不同产区略有差异;由于人为过度采挖和生态环境条件的变化,广西青天葵野生资源的分布面积逐年减缩,蕴藏量急剧减少。经调查,广西青天葵野生资源蕴藏量(鲜品)仅为4 815 kg。建议采取各种积极的措施保护青天葵野生资源,保证青天葵的可持续利用。 相似文献
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湖南省野生果树资源的研究 总被引:8,自引:0,他引:8
1991-1996年对湖南省野生果树资源进行了研究,基本上摸清了该省野生果树资源的种类、分布及蕴藏量,计有209种及变种,隶属39属18科,并对主要种类的分布特点及蕴藏量进行了评价,为综合开发利用提供了依据。 相似文献
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目的:探清福建省多叶重楼野生资源及栽培现状,研究其形态遗传多样性,为重楼优良种质筛选提供基础数据。方法:通过文献查阅、访查和野外实地调查等方法,考察福建省多叶重楼资源分布、生态环境及栽培现状。对9个多叶重楼资源的13个形态性状进行变异系数分析、主成分分析及聚类分析。结论:调查发现福建省多叶重楼野生资源稀少,多分布于湿润且隐蔽度较大、通风性好的地带;多叶重楼原始生境伴生喜阴植物。形态多样性分析表明不同资源间变异系数从10.14%~48.05%,综合结果显示花瓣宽等性状是造成表型差异的主要因素。福建省野生重楼资源蕴藏量下降严重,相关部门应加强重楼野生资源保护和大力推广人工种植。 相似文献
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为了探究喀斯特地区野生毛葡萄(Vitis quinquangularis Rehd.)器官的钙含量、组分及其分布特征,揭示野生毛葡萄的需钙特性及其对高钙土壤的适应机制。该研究以贵州喀斯特地区野生毛葡萄为材料,取样测定了40个样地的野生毛葡萄立地土壤的pH值、交换性钙含量及其根、茎、叶中钙和镁及其钙组分含量,分析土壤交换性钙含量与不同钙组分间的关系,并观察野生毛葡萄叶片表面及根、茎、叶中的钙晶体。结果表明:(1)喀斯特地区野生毛葡萄总钙含量在器官中的分布表现为叶>根>茎,其分布特征与喜钙植物类似。(2)野生毛葡萄根、茎、叶中主要钙组分含量由高到低依次基本为草酸钙、果胶酸钙、水溶性钙、磷酸钙+碳酸钙、硝酸钙+氯化钙、硅酸钙(茎中稍有不同),根、茎、叶中草酸钙占所有钙组分总量和总钙含量的比例均最高,其次是果胶酸钙。(3)各样地野生毛葡萄叶片中Ca+Mg的含量范围在1.30%~4.07%之间,绝大多数在3.0%~4.0%范围内,表现出喜钙植物叶中高Ca+Mg含量的特性。(4)在喀斯特地区的野生毛葡萄体内,多种钙组分含量与土壤中的钙含量呈显著或极显著的正相关关系。(5)扫描电镜观察发现,野生毛葡萄叶片和根中储存有大量的草酸钙晶体,叶片中的草酸钙可通过气孔排出体外。研究发现,喀斯特地区野生毛葡萄属于喜钙植物,对喀斯特高钙环境的适应性强,叶片中钙的富集量大,有大量的草酸钙和果胶酸钙储存于体内,这种储钙特性和气孔的排钙行为对野生毛葡萄适应高钙环境具有重要作用。 相似文献
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天然草地野生中草药材,是草地资源的重要组成部分,是中草药的主要来源之一,是医疗保健、发展医药卫生事业不可缺少的宝贵资源.通过对内蒙古巴林左旗天然草地野生中草药资源分布、蕴藏量及生产利用等状况综合分析,提出了天然草地野生中草药材有效保护与合理利用的具体措施,对做好当地野生中药材管理与生产,做到资源的可持续利用具有一定的指导意义. 相似文献
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目的:通过对甘肃省款冬资源分布及变化情况进行调查,制定款冬资源的利用和保护策略。方法:通过走访调查款冬野生资源分布区域、蕴藏量、采挖量及人工种植面积、产量、交易量、市场价格等。结果:甘肃省款冬资源丰富,野生款冬年蕴藏量约300~500 t,采挖做药用约占蕴藏量的10%。人工种植2020年全省款冬种植面积约1600 hm2,年产量约1300 t,种植面积受价格下跌影响呈下降趋势。结论:加强款冬野生资源的保护,开展款冬生产的创新研究,对于甘肃省款冬产业可持续发展具有十分重要的作用。 相似文献
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In experiments on Black Sea skates (Raja clavata), the potential of the receptor epithelium of the ampullae of Lorenzini and spike activity of single nerve fibers connected to them were investigated during electrical and temperature stimulation. Usually the potential within the canal was between 0 and –2 mV, and the input resistance of the ampulla 250–400 k. Heating of the region of the receptor epithelium was accompanied by a negative wave of potential, an increase in input resistance, and inhibition of spike activity. With worsening of the animal's condition the transepithelial potential became positive (up to +10 mV) but the input resistance of the ampulla during stimulation with a positive current was nonlinear in some cases: a regenerative spike of positive polarity appeared in the channel. During heating, the spike response was sometimes reversed in sign. It is suggested that fluctuations of the transepithelial potential and spike responses to temperature stimulation reflect changes in the potential difference on the basal membrane of the receptor cells, which is described by a relationship of the Nernst's or Goldman's equation type.I. P. Pavlov Institute of Physiology, Academy of Sciences of the USSR, Leningrad. I. M. Sechenov, Institute of Evolutionary Physiology and Biochemistry, Academy of Sciences of the USSR, Leningrad. Pacific Institute of Oceanology, Far Eastern Scientific Center, Academy of Sciences of the USSR, Vladivostok. Translated from Neirofiziologiya, Vol. 12, No. 1, pp. 67–74, January–February, 1980. 相似文献
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N. P. Vesselkin Yu. V. Natochin 《Journal of Evolutionary Biochemistry and Physiology》2010,46(6):592-603
Evolution of living organisms is closely connected with evolution of structure of the system of regulations and its mechanisms.
The functional ground of regulations is chemical signalization. As early as in unicellular organisms there is a set of signal
mechanisms providing their life activity and orientation in space and time. Subsequent evolution of ways of chemical signalization
followed the way of development of delivery pathways of chemical signal and development of mechanisms of its regulation. The
mechanism of chemical regulation of the signal interaction is discussed by the example of the specialized system of transduction
of signal from neuron to neuron, of effect of hormone on the epithelial cell and modulation of this effect. These mechanisms
are considered as the most important ways of the fine and precise adaptation of chemical signalization underlying functioning
of physiological systems and organs of the living organism 相似文献
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