导读:本文包含了积累变化论文开题报告文献综述、选题提纲参考文献及外文文献翻译，主要关键词:石斛,蔗糖,碳水化合物,氮素,糜子,女贞子,青皮。
积累变化论文文献综述
战丽杰,李凌浩,孟伟,徐伟,韩晨静[1]（2019）在《模拟降水量变化对防风(Saposhnikovia divaricata)幼苗光合特性及矿质营养积累的影响》一文中研究指出为研究降水量变化对防风(Saposhnikovia divaricata)幼苗光合特性及矿质营养积累的影响,采用盆栽实验,以防风幼苗为材料,模拟研究了正常降水(CK,施水量为309 mm,参照防风种子采集地1979-2000年6-9月的总降水量)、增加降水30%(+W)和减少降水30%(-W)对防风幼苗光合特性及矿质营养积累的影响。结果表明:与CK和+W处理相比,?W处理防风幼苗的叶片叶绿素和类胡萝卜素含量显着增加,叶片净光合速率、气孔导度和表观叶肉导度(移栽后73 d、102 d和128 d)显着提升;脯氨酸含量(叶片、叶柄和根)、氮含量(叶片、叶柄和根)、磷含量(叶片和根)、钾含量(叶片和叶柄)、钙含量(根)和硫含量(叶片)显着增加。在本实验条件下,减少降水处理能够使防风幼苗叶片光合作用及植株矿质营养含量维持在较高水平,有利于其生长发育,有利于防风幼苗初生代谢产物的积累。(本文来源于《山东林业科技》期刊2019年05期）
张翠芳,王世伟,马彬,吉昱,张梅[2]（2019）在《‘新新2号’核桃果实发育进程中碳水化合物积累与变化》一文中研究指出以新疆南疆盆地核桃主栽品种‘新新2号’(Juglans regia ‘Xinxin2’)为研究对象,研究果实不同生长发育时节其青皮和种仁中葡萄糖、蔗糖、果糖、淀粉含量和中性转化酶(NI)、酸性转化酶(AI)、蔗糖合成酶(SS)、蔗糖磷酸合成酶(SPS)的活性变化。结果表明:花后45～70 d,果实处于速生生长期,青皮中果糖和葡萄糖含量高于蔗糖和淀粉,AI活性保持较高水平,种仁中果糖含量高于蔗糖、葡萄糖和淀粉含量;花后90～110 d,果实处于油脂转化期,青皮蔗糖含量和SS、SPS活性迅速升高,种仁蔗糖和葡萄糖含量高于果糖含量,SS和SPS活性急剧升高,NI和AI活性保持较低水平。相关分析结果显示,青皮蔗糖含量与SS活性、SPS活性呈显着正相关(P<0.05),果糖含量与AI活性呈显着正相关(P<0.05);种仁淀粉含量与青皮淀粉含量呈显着正相关(P<0.05),与青皮AI活性呈显着负相关(P<0.05)。在速生生长期,核桃果实青皮中的蔗糖在高活性的AI作用下被分解成葡萄糖和果糖,为果实细胞分裂和形态构建提供物质和能量基础;在油脂转化期,核桃果实青皮和种仁中蔗糖的积累是高活性的SS、SPS和低活性的AI、NI共同作用的结果。(本文来源于《北方园艺》期刊2019年21期）
党科,宫香伟,陈光华,赵冠,刘龙[3]（2019）在《糜子绿豆带状种植下糜子的氮素积累、代谢及产量变化》一文中研究指出禾豆间作是一种高效的生态种植模式,为明确糜子-绿豆合理间套作种植模式下糜子对养分高效利用的机制,于2017—2018年在榆林小杂粮综合试验示范站,以单作糜子(SP)为对照,设糜子(P)-绿豆(M)4种间作模式[2∶2(2P2M)、4∶2 (4P2M)、4∶4 (4P4M)、2∶4 (2P4M)],分析糜子开花期和成熟期不同器官干物质积累、氮素含量及植株氮积累量,以期探讨叶片和根系氮素代谢的变化规律,进一步挖掘不同间作模式对糜子产量及其构成因素的调控效应。结果表明,糜子-绿豆间作可显着增加糜子开花期根系、茎秆、叶片和鞘的氮素含量,使成熟期穗的氮含量比单作增加10.9%～15.9%;间作有利于促进糜子器官的生长发育,与单作相比,间作模式下糜子成熟期干物质积累量两年试验平均提高11.6%～32.1%,植株氮素积累量增加12.8%～36.9%,其中糜子叶片和茎秆的氮素转运量分别比单作增加51.7%～78.9%和24.1%～55.6%,叶片对于穗的氮素贡献率增加40.6%～66.9%。糜子-绿豆间作模式可显着调节糜子旗叶和根系的氮素代谢,硝酸还原酶活性、谷氨酰胺合酶活性、可溶性蛋白含量及游离氨基酸含量均有不同程度的增加,2P4M处理下达到最大值。植株生理代谢、氮素营养的合理调控显着改善了糜子产量及其构成因素,产量表现为2P4M>4P4M>2P2M>4P2M>SP。综上所述,糜子-绿豆间作模式可促进糜子生育后期的氮素积累、转运及氮素代谢,延缓了植株的衰老,提高糜子产量,表现出明显的间作优势。本试验条件下,2P4M是陕北地区糜子-绿豆最佳的间作配比。(本文来源于《作物学报》期刊2019年12期）
叶红霞,吕律,王同林,海睿,汪炳良[4]（2019）在《不同变种甜瓜糖分积累及蔗糖代谢酶活性动态变化》一文中研究指出为了解不同类型甜瓜糖分积累及糖代谢特点,选用厚皮甜瓜品种X228、普通甜瓜品种B154及越瓜品种H227为材料,定期取样测定果实成熟过程中的葡萄糖、果糖、蔗糖含量和蔗糖代谢相关酶活性,研究不同变种甜瓜果实发育过程中糖分积累及相关酶动态变化差异。结果表明,授粉15 d至果实成熟期间,3个甜瓜品种的果实葡萄糖与果糖含量的变化均较小,品种间差异不显着。3个甜瓜品种果实蔗糖含量存在显着性差异,其中H227果实几乎无蔗糖积累,葡萄糖和果糖是果实的主要糖组分;B154和X228果实蔗糖含量随着果实发育而快速增加,蔗糖积累存在明显的转折点,蔗糖是B154和X228这2个品种成熟果实中最主要的糖组分,且果实蔗糖含量提高的同时蔗糖磷酸合成酶(SPS)活性上升、酸性转化酶(AI)活性降低,蔗糖合成酶(SS)合成方向的活性与蔗糖含量关系不显着。根据蔗糖含量的差异,可将甜瓜分为蔗糖积累型和低蔗糖积累型两类,前者果实蔗糖含量的上升被认为是SPS活性上升与转化酶(特别是AI)活性下降共同作用的结果,后者果实内极低的蔗糖含量被认为是SPS活性较低导致的。本研究结果为甜瓜种质资源创新利用和甜瓜果实糖分积累调控研究奠定了理论基础。(本文来源于《核农学报》期刊2019年10期）
刘芳,余世荣,张晓燕,祝宇,王东鹏[5]（2019）在《冬至前后女贞子中3种活性物质积累量的变化研究》一文中研究指出目的:研究冬至前后不同采收时间女贞子中主要活性成分特女贞苷、红景天苷和酪醇积累量的变化,为合理确定女贞子的最佳采收时间提供实验依据。方法:采用梯度洗脱建立HPLC法同时测定特女贞苷、红景天苷和酪醇的含量,用层次分析法(AHP)确定叁种成分含量的权重系数分别为0. 581,0. 309,0. 110,加权综合分析8个采收时间3种成分积累量的变化趋势。结果:特女贞苷、红景天苷和酪醇在各自范围内均呈现良好的线性关系(r> 0. 999 8),加样回收率分别为95. 48%,98. 52%,95. 63%RSD分别为2. 25%,1. 91%,0. 99%(n=5);各成分的综合评分从11月12日开始呈逐渐上升,到12月12日达到峰值后开始逐渐下降的趋势。结论:本试验中最佳的采收时间应该确定在冬至前1个月,此时女贞子性状符合中国药典要求,且各有效成分能达到单产量中含量最大化。(本文来源于《中国药师》期刊2019年05期）
吕朝耕,李佳兴,蒋靖怡,杨健,王升[6]（2019）在《浙产铁皮石斛不同生长期石斛酚、有机酸和黄酮类成分积累变化》一文中研究指出目的:建立铁皮石斛中石斛酚含量测定方法,并对不同生长期浙产铁皮石斛石斛酚、有机酸和黄酮类成分进行测定分析,以期从次生代谢物角度为浙产铁皮石斛采收期确定提供参考。方法:采用ACQUITY UPLCBEH C18(2.1mm×100mm,1.8μm)色谱柱,0.1%甲酸-水溶液(A)及0.1%甲酸-乙腈(B)为流动相,梯度洗脱,流速0.6mL/min,柱温40℃,正离子多反应监测(MRM)模式对石斛酚进行含量测定。结果:石斛酚在检测浓度范围内呈良好线性关系(R2=0.9997),加样回收率为95.45%,RSD值为2.1%。测定结果显示在一个生长周期内各成分总体含量表现出先降低后升高再降低的趋势,在花期及花期后达到最高;各成分分别在花期、花期后或封顶期含量最高。结论:花期及花期后(6～7月份)可作为浙产铁皮石斛潜在的最佳采收期进行更深入研究。(本文来源于《中华中医药杂志》期刊2019年05期）
徐明[7]（2019）在《积累基本活动经验目标下的“变化的量”教学策略》一文中研究指出"比例"是"正反比例"的前概念,是苏教版数学六年级下册教学内容。课本中前两个情景用矩形来显示图片尺寸的扩大,设计主旨是通过观察长度、宽度的动态关系,联系长方形形状的不变性,实现对数量变化规律的定性分析。(本文来源于《数学大世界(下旬)》期刊2019年03期）
吴铭[8]（2019）在《作风优良靠平时点滴养成》一文中研究指出“硬骨头六连”连史上有这样一个故事：上世纪60年代初，部队奉命到福建前线执行战备任务，机关和部队时常一起在营院操场看电影。一位细心的军区首长发现，放映前，此起彼伏的歌曲口号声中，有一个连队的声音格外嘹亮整齐。每次散场后，纸屑果皮满地的操场上，那个连队坐过(本文来源于《解放军报》期刊2019-01-09）
Asif,Khan[9]（2018）在《长期施肥与土地利用变化土壤剖面磷素积累与分布的响应》一文中研究指出Phosphorus(P)is an essential element for all forms of life on earth.P is by far the most important mineral nutrient for crop production,after nitrogen(N).The production of crops for food requires an adequate supply of P in the soil.However,surplus application of P is common in China for both cereal and other systems,how P transforms and accumulates in deep soil profile needs more investigation to further understand P performance.The Loess Plateau region is an important and large arable crop production area in Northwest China.Dryland farming is the dominant approach in this region,with single crops of winter wheat(Triticum aestivum L.)or spring maize(Zea mays L.)each year.The double cropping with irrigated winter wheat and summer maize plays the key role in supplying food for local people.In addition,in past 20 years land-use changes from arable crop to greenhouse vegetable or kiwi-orchard happen widely in this area,which led to great changes in nutrient input.However,limited information is available about how continuously applying P fertilizers from different sources affects P efficiency,P dynamics and P transport in the soil profiles.This study investigated 1)P efficiency,critical P levels,soil P availability and distribution of P fractions in soil profile based on 25-year long-term fertilization experiments;2)accumulation and distribution of P in soil profile after conversion cereal crops to greenhouse vegetable and kiwi-orchard.Long-term experiments involved both single and double cropping systems.The single cropping included four treatments,i.e.control(CK),application of mineral P and potassium(PK),combining application of NPK,organic manure combined with NPK(MNPK).The double cropping system involved five treatments,in which four was same as those under single cropping,and the additional one was crop straw combined with NPK(SNPK).The three land-uses were also involved:(1)wheat-maize double cropping system;(2)greenhouse vegetable;and(3)kiwi-orchard.The main results obtained were as follow:The P efficiency ranged from 20 to 54%under the double cropping system and from 13to 33%in the single cropping system over the 25 years studied,and the highest P efficiency was in the NPK treatment in both systems.Application of P significantly increased soil total-P,Olsen-P and CaCl_2-P over the years,especially in the MNPK treatment.Two segment regression analyses indicated that Olsen-P was about 14 mg kg~(-1) or 16 mg kg~(-1) for optimal crop yield under double cropping or single cropping.In addition,Olsen-P content above 37mg kg~(-1) or 57 mg kg~(-1) led to a significant increase in CaCl_2-P content under double cropping or single cropping,which might indicate risk of P leaching.After 24 years of P applications,total P accumulated at various depths depending on treatment under double cropping,but there was no accumulation under single cropping.While Olsen-P leached down to a depth of300 cm in the MNPK treatments under both cropping systems,and higher concentrations were recorded in the deeper layers in single cropping than in double cropping systems.The Olsen-P leached to a shallower depth in the PK and NPK treatments under single cropping compared to double cropping.It is concluded that P supply in excess of the crop’s requirement(e.g.MNPK)or an unbalanced nutrient supply(e.g.PK)resulted in not only low P efficiency and massive accumulation of P in the topsoil but also leaching out of root zone under both irrigated and rain-fed conditions in the loess soil.Thus,P fertilization recommendations need to be adjusted based on changes in soil P over time.After long-term P fertilization under double cropping system soil labile P,moderately labile P and less labile P pools in the surface soil(0-20 cm)was significantly higher under MNPK than under other treatments,and the differences between NPK and SNPK treatments was non-significant.All P pools in NPK and SNPK treatments were also significantly higher those in CK treatment.Furthermore,in subsoil layers(20-100 cm),these P pools were consistently greater under MNPK treatment compared with CK.Moderately labile P and less labile P were also significantly higher in NPK and SNPK treatments than in CK.For labile P pool,long-term fertilization regimes(NPK,SNPK and MNPK)mainly increased the organic P extracted by NaHCO_3 throughout soil profile(0-100 cm).But MNPK also significantly enhanced both water and NaHCO_3extracted inorganic labile P.While long-term fertilization increased moderately labile P pool through increasing NaOH extracted organic P.Results suggest that long-term fertilization regimes mainly enhanced moderately labile P pool throughout soil profile.Compared with arable land,vegetable greenhouse or kiwi orchard showed significantly greater soil P accumulation at surface layer,i.e.CaCl_2-P increased by 10-20 times,Olsen-P by3-5 times,Mehlich-3 extracted P by 3-6 times and organic P by maximum of 4 times.Degree of P saturation(DPS)increased from 4%under arable crop to 14%under kiwi-orchard and22%under greenhouse vegetable.Land conversion also markedly increased soil available P(Olsen-P and Mehlich-3 extracted P)distributing in deep soil layers down to 300 cm,especially for greenhouse vegetable,where Olsen-P or Mehlich-3 extracted P contents reached the critical P value for arable crop to achieve maximum yield.This indicates a huge amount of P had been further leached down to deep soils under the current management.Conversion from cereals to greenhouse vegetable significantly increased the easily-available-P and moderately available-P pools in the top 60 cm depth,and non-available-P pool at top 40 cm depth.The increase in labile inorganic fractions was the main contribution for increases of easily-available-P and moderately available-P pools in comparison to the labile organic fractions.However,conversion from cereals to kiwi-orchard significantly increased three P pools at top 20 cm depth.Easily-available P fractions(i.e.,H_2O-Pi,NaHCO_3-Pi and NaHCO_3-Po)were strongly and positively correlated with organic carbon content,suggesting that SOM plays a key role in maintaining P availability.Overall,long-term surplus P application has led to great amount of P accumulating and distributing in deep subsoil layers which were prone to economic losses and posing the high potential environmental risks.Hence,there is an urgent need to update the P management strategies for both cereal cropping system and greenhouse vegetable or kiwi orchard to prevent the situation from getting worsen in future.(本文来源于《西北农林科技大学》期刊2018-11-01）
李晓梅,蔡文平[10]（2018）在《在数学建模中积累探究活动经验——以《面积的变化》教学为例》一文中研究指出探究活动经验的形成和积累,离不开学生外显行为和思维层面的操作活动。因此,经历数学建模的过程,无疑是积累探究活动经验的一条有效路径。在数学建模过程中,学生不但充分经历了行为操作过程(如画图、测量等),而且充分经历了思维操作过程(猜测、验证、类推、分析、概括等),他们反复猜测验证,不断探究发现,逐步积累了丰富的探究活动经验。(本文来源于《教育研究与评论(小学教育教学)》期刊2018年10期）
积累变化论文开题报告
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以新疆南疆盆地核桃主栽品种‘新新2号’(Juglans regia ‘Xinxin2’)为研究对象,研究果实不同生长发育时节其青皮和种仁中葡萄糖、蔗糖、果糖、淀粉含量和中性转化酶(NI)、酸性转化酶(AI)、蔗糖合成酶(SS)、蔗糖磷酸合成酶(SPS)的活性变化。结果表明:花后45～70 d,果实处于速生生长期,青皮中果糖和葡萄糖含量高于蔗糖和淀粉,AI活性保持较高水平,种仁中果糖含量高于蔗糖、葡萄糖和淀粉含量;花后90～110 d,果实处于油脂转化期,青皮蔗糖含量和SS、SPS活性迅速升高,种仁蔗糖和葡萄糖含量高于果糖含量,SS和SPS活性急剧升高,NI和AI活性保持较低水平。相关分析结果显示,青皮蔗糖含量与SS活性、SPS活性呈显着正相关(P<0.05),果糖含量与AI活性呈显着正相关(P<0.05);种仁淀粉含量与青皮淀粉含量呈显着正相关(P<0.05),与青皮AI活性呈显着负相关(P<0.05)。在速生生长期,核桃果实青皮中的蔗糖在高活性的AI作用下被分解成葡萄糖和果糖,为果实细胞分裂和形态构建提供物质和能量基础;在油脂转化期,核桃果实青皮和种仁中蔗糖的积累是高活性的SS、SPS和低活性的AI、NI共同作用的结果。
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积累变化论文参考文献
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