水稻耐光氧化和耐阴特性的鉴定及其生理基础

水稻耐光氧化和耐阴特性的鉴定及其生理基础焦德茂，高亮之，金之庆，季本华，严建民（江苏省农业科学院，南京２１００１４；南通师范专科学校，南通２２６００７）关键词：光氧化；耐阴；光合特性ＩｄｅｎｔｉｆｉｃａｔｉｏｎａｎｄＰｈｙｓｉｏｌｏｇｉｃａｌＢａｓｉ...     

上海市某马场马疱疹病毒1型感染的确诊

采用马疱疹病毒1型和4型二重PCR分型方法,对上海市某马场临床疑似病例的鼻拭子和血浆样品进行检测,同时对扩增产物进行测序和比对,确诊为马疱疹病毒1型阳性,表明上海市马群中存在马疱疹病毒1型感染。因此,应提高上海市马匹饲养管理水平,加强马疱疹病毒1型的定期免疫和检疫,及时对阳性马匹进行隔离,对马厩进行消毒。     

Successive grafting confers juvenility traits to adult Spanish red cedar (Cedrela odorata Linnaeus): a tool for the rescue of selected materials

New Forests - Spanish red cedar, Cedrela odorata L. (Meliaceae), is a valuable timber tree in tropical American forests. Existing demand for elite individuals endangers the conservation of...     

马铃薯不同品种及高经济高营养“黑美人”脱毒培养技术的研究

解决马铃薯种薯退化问题一般采用茎尖组织脱毒培养(又叫分生组织脱毒培养).本实验又通过对马铃薯不同品种块茎具芽眼部分进行脱毒培养,培育出无病毒种苗,通过测其株高、茎粗、统计子叶数目、观察子叶颜色对比“黑美人”、新大品、土豆-10、陇薯3号生长势强弱.对以上两种脱毒培养制定消毒时间梯度,总结最佳消毒时间,分析污染原因并提出...     

章古台固沙林更新造林中天然更新的结合与利用

辽宁省章古台固沙林经过经营疏伐与块状采伐以后,通风透光条件改善,促进了天然下种更新。天然更新强度,在采伐迹地为690株·hm^-2,人工更新造林地为575株·hm^-2,油松和赤松林下松树为181株·hm^-2,其他树种295株·hm^-2。通过采取保护1年生樟子松幼树越冬,抚育油松、赤松幼树等措施,促进针叶树天然更新。在更新造林中,沙丘下部与丘间低地营造杨树,利用行间天然更新树木形成阔叶树混交林,沙丘中上部营造针叶树,利用行间天然更新灌木,形成乔灌混交林。     

乐昌含笑叶挥发油GC-MS及其活性初步测定

采用气-质联用法对乐昌含笑叶挥发油的化学成分研究表明,该油含23种化合物,其含量较高的物质有:十四氢化芘(18.891%);3,6-二甲基-5-丙烯基-6-乙烯基-4,5,6,7-四氢-1-苯并呋喃(16.066%);2,5-二环戊亚基-环戊酮(9.436%);3,3-二甲基-5-叔丁基-1-茚酮(8.892%);乙酸-3a,9b-二甲基-7-羰十氢化环戊并a萘-3-酯(8.024%);1,3-二甲基-2-丁烯基-5-叔丁基苯(5.720%);β-丁香烯(4.719%);5,11(13)-桉叶二烯-8,12-内酯(4.005%);β-橄香烯(3.232%);γ-杜松烯(1.977%);β-法尼烯(1.810%);含木香内酯(1.084%)。文章还对其挥发油的活性进行了初步测定。       

尾巨桉与马占相思P-RC APMP工艺制浆性能比较

以尾巨桉和马占相思为原料,采用经化学预处理的碱性过氧化氢机械浆(P-RCAPMP)制浆工艺对比研究两者的制浆性能.研究结果表明,相同的H2O2用量(4.0%)和NaOH用量(3.5%)条件下,2种原料制得纸浆的白度相近,均可达75%左右;马占相思原料制浆得率比尾巨桉约高3%左右,物理强度性能远优于尾巨桉浆,相同的250mL加拿大标准游离度(CSF)下,尾巨桉纸页的抗张强度仅为20.1N·m/g,而马占相思纸页的抗张强度可达到26.0N·m/g以上.制得相近CSF的纸浆,马占相思制浆所需的磨浆电耗比尾巨桉略高;2种原料制浆废水的化学耗氧量(COD)和生物耗氧量(BOD)发生量相近,而尾巨桉的制浆废水中固体悬浮物(SS)及总固形物(TS)含量远高于马占相思废水.     

Relationship between species richness and biomass on environmental gradient in natural forest communities on Mt. Xiaolongshan,northwest China

We analyzed the relationship between species richness and biomass in natural forest communities at two similar sites on Mt. Xiaolongshan, northwest China. At both sites, a wide range of tree layer biomass levels was available by local biomass estimation models. In order to identify underlying mechanism of the species richness-biomass relationship, we included different water resource levels and number of individuals in each plot in our analysis. We sampled 15 and 20 plots （20 m ×20 m）, respectively, at both two sites. These plots were sampled equally on the sunny slope and the shady slope. Species richness, number of individuals of each species and diameter at breast height （DBH） as a substitute of biomass of tree layer were recorded in each sample. At one site, the relationship between species richness and biomass was significant on the sunny slope, and this relationship disappeared on the shady slope due to more environmental factors. The relations between species richness and number of individuals and between number of individuals and biomass paralleled the species richness-biomass relation on both slopes. The difference in number of individuals-biomass relationships on the sunny slope and the shady slope revealed ＂interspecific competitive exclusion＂ even though the species richness-biomass relationships were not hump-shaped. At the other site, species richness was not related to biomass or to number of individuals. Our study demonstrated the importance of environmental stress and succession of community in the understanding of species diversity-productivity patterns.     

会同第二代杉木人工林林下植被生物量分布及动态

对会同第2代杉木人工林速生阶段林下地被物生物量进行了2a的定位研究,探讨了杉木林林下灌木层、草本层的生物量动态变化。结合幼林期林下地被物生物量的特征,分析了第2代杉木林林下活地被物生物量的动态变化特征。结果表明:13年生林分中灌木层生物量为521.89kg·hm-2,草本层为1429.71kg·hm-2;14年生林分中灌木层生物量为372.69kg·hm-2,草本层为897.10kg·hm-2,2a中,灌木层各组分生物量大小顺序都为根茎叶;草本层生物量的大小顺序为地下部分地上部分。在杉木14a的生长过程中,林分5年生时,活地被物生物量最大,为3089.62kg·hm-2,14年生时最小,为1269.79kg·hm-2。     

多胺交联纤维素树脂的合成及吸附性能(Ⅺ)——天然高分子吸附剂研究

报道了多乙烯多胺交联的纤维素树脂的合成及其对若干重金属离子的静态吸附性能和吸附机理。研究结果表明，该树脂能有效地吸附Ｃｕ２＋、Ｎｉ２＋、Ｃｏ２＋、Ｚｎ２＋、Ｐｂ２＋，其吸附量可分别达１．２８，１．２４，０．５８，０．６６和０．９９ｍｍｏｌ／ｇ。在ＨＯＡｃ－ＮａＯＡｃ缓冲溶液中可选择吸附Ｃｕ２＋、Ｎｉ２＋等离子而不吸附Ｐｂ２＋。