巨大/胶冻样类芽孢杆菌对印度芥菜修复Cd污染土壤的影响

采用盆栽试验方法,研究了接种巨大芽孢杆菌和胶冻样类芽孢杆菌的混合发酵液对印度芥菜修复Cd污染土壤的影响。结果表明,接种混合菌发酵液可显著增加印度芥菜的生物量,接种20d、接种量为50ml时,总生物量较对照组增加了50.44%;在接种30d时,50ml混合菌发酵液处理的印度芥菜地上部P、K的含量显著高于对照组,分别增加了48.84%和74.90%,同时接种50ml混合菌发酵液可显著提高根际和非根际土壤中有效态Cd含量,使其较对照分别增加了39.29%和32.52%。接种混合菌发酵液可促进印度芥菜对土壤Cd的吸收,接种40d接种量为50ml时Cd吸收总量较对照组显著增加了60.36%。综上所述,接种混合菌发酵液50ml时,可促进印度芥菜的生长,增加土壤有效态Cd含量,从而提高了印度芥菜对Cd污染土壤的修复效率。     

ZigBee技术在农林业中的应用研究

设计一个基于ZigBee技术的农林业生产环境监测系统。系统采用太阳能电池供电,利用ZigBee技术将传感器采集到的与农林业生产环境相关的数据通过无线网络传输给上位机。该系统的应用可为农林业环境质量评价、农林业环境质量变化趋势预测提供实时、准确的数据。     

Effect of successive cuttings on uptake and partitioning of 15N among plant parts of Leucaena leucocephala

Summary We studied the effect of three successive cuttings on N uptake and fixation and N distribution in Leucaena leucocephala. Two isolines, uninoculated or inoculated with three different Rhizobium strains, were grown for 36 weeks and cut every 12 weeks. The soil was labelled with 50 ppm KNO₃ enriched with 10 atom % ¹⁵N excess soon after the first cutting. Except for the atom % ¹⁵N excess in branches of K28 at the second cutting, both the L. leucocephala isolines showed similar patterns of total N, fixed N₂, and N from fertilizer distribution in different parts of the plant at each cutting. The Rhizobium strain did not influence the partitioning of ¹⁵N among the different plant parts. Significant differences in ¹⁵N enrichment occurred in different parts. Live nodules of both isolines showed the lowest atom % ¹⁵N excess values (0.087), followed by leaves (0.492), branches (0.552), stems (0.591), and roots (0.857). The roots contained about 60% of the total plant N and about 70% of the total N derived from fertilizer over the successive cuttings. The total N₂ fixed in the roots was about 60% of that fixed in the whole plant, while the shoots contained only 20% of the fixed N₂. We conclude that N reserves in roots and nodules constitute another N source that must be taken into account when estimating fixed N₂ or the N balance after pruning or cutting plants. ¹⁵N enrichment declined up to about fivefold in the reference and the N₂-fixing plants over 24 weeks following the ¹⁵N application. The proportion and the amounts of N derived from fertilizer decreased, while the amount derived from N₂ fixation increased with time although its proportion remained constant.     

具有中国大豆遗传背景的7S与11S多亚基缺失型大豆新品系的创制

利用我国高油大豆品种东农47与日本引进多亚基缺失型育种材料日B,采用回交、三交的育种方法,综合系谱选择,通过SDS-PAGE技术分析亚基组成,在BC₁、BC₃及三交种F₈群体内,选育到(α+11S groupⅡa)-缺失型、(α′+11S groupⅡa)-缺失型、[(α′+α)+11S groupⅡa、Ⅱb]-缺失型、[(α′+α)+11S groupⅡa]-缺失型、[(α′+α)+11S groupⅡb+X₁X₂]-缺失型、[(α′+α)+11S groupⅡb]-缺失型和(α′+11S groupⅠ、Ⅱa)-缺失型共7种具有中国大豆遗传背景的7S球蛋白α′、α亚基与11S球蛋白groupⅠ(A_1aB_1b,A₂B_1a,A_1bB₂)、groupⅡa(A₄A₅B₃)和groupⅡb(A₃B₄)不同亚基缺失组合新种质。测定优良品系的综合农艺性状及氨基酸组成、含量,结果表明,与对照相比,各种缺失突变体的各种氨基酸组分含量普遍提高,蛋白总量普遍高于轮回亲本,精氨酸含量特别是游离精氨酸的含量大幅提高。其中亚基组成为(α+11S groupⅡa)-缺失型品系G2-2-3的17种氨基酸含量、氨基酸总量、蛋氨酸含量均显著高于轮回亲本东农47,特别是游离精氨酸含量高出7.27mg/g。以上结果表明,7S与11S多亚基缺失型优良品系在有效去除致敏蛋白的同时,可以提高大豆蛋白氨基酸含量, 改善大豆蛋白氨基酸组分配比。各种致敏蛋白缺失型大豆优良新品系的获得,大大丰富了我国蛋白质组分改良育种的种质基础。     

内蒙古东北部草原森林生态系统夏季森林鸟类群落

2001年和2002年6月和7月，分别对内蒙古东北部草原森林生态系统天然樟子松的幼林、中龄林、成熟林、人工中龄林，以及山杨、白桦阔叶林等不同森林类型中的繁殖期鸟类群落进行了初步研究。在研究地的林型中，共发现了19种鸟类。不同生境鸟类的种数、密度、优势度也不同。对各林型鸟类群落的多样性、相似性进行了分析，其中：天然樟子松成熟林的鸟类的种类最多达14种，多样性为1．5799；山杨、白桦阔叶林的鸟类的种类最少，为2种，多样性为0．6365；天然樟子松幼林、中龄林、人工中龄林的鸟种数分别为6、10、7种，多样性指数分别为1．3399，1．4346，1．4235。天然樟子松的中龄林与成熟林的相似性最高，山杨、白桦阔叶林与樟子松人工中龄林最低。     

东北地区螽斯总科调查报告

通过近4a的调查,初步摸清了东北地区螽斯总科的种类与分布,包括硕螽科3种、露螽科6种、螽斯科23种、草螽科10种,共计17属42种2亚种。其中:拟寰螽属Paratlanticus为国内新记录属;长白山拟寰螽Pa-ratlanticus palgongensis、对马拟寰螽Paratlanticus tsushimensis、乌苏里拟寰螽Paratlanticus ussuriensis和乌苏里姬螽Metrioptera ussuriana为国内新记录种。并对一些种中存在的问题进行了分析和讨论。     

环氧树脂-水性聚酰胺改性豆粕胶黏剂压制胶合板的研究

本文采用环氧树脂和水性聚酰胺对豆粕进行复合改性制备无醛胶黏剂,对豆粕胶黏剂的性能指标和胶合板的胶合强度进行了研究.通过正交试验得出以下最佳工艺参数:当热压温度为120℃、环氧树脂与水性聚酰胺改性豆粕溶液的质量比为20:80、热压时间600 s时胶合板的胶合强度最高,为0.7628 MPa,达到国家标准GB/T 9846...     

毛白杨木材形成功能基因内SSR标记的开发及评价

利用直接测序法开发木材形成功能基因内一套新的核基因组SSR标记.通过对参与木材形成的16个基因在40个毛白杨基因型个体中的序列比较分析,共检测剑20个SSR多态性位点.在毛白杨自然群体中,SSR多态性位点的碱基重复呈现出二碱基、三碱基、五碱基、六碱基与七碱基形式,基元霞复次数变异范围为2～34次,其中以二碱基重复的位点较多,占总数的55.0%.在此基础上,依据SSR位点两侧的保守序列,设计20对SSR位点PCR扩增引物对.利用设计的引物检测开发的SSR位点在杨属内15个基因型个体中PCR扩增的有效性及SSR位点的保守性.PCR扩增结果显示,90.0%的SSR位点能够在杨属至少2个派内有效扩增,每对引物组合可检测到SSR多样性位点数为3～9个,平均5.3个.开发的这些SSR位点在功能基因内小同区域的分布频率不同.     

A survey of sheep dip usage in Scotland in 1978

A survey of sheep dipping in Scotland in 1978 showed that about 42 tonnes of organophosphorus and 17 tonnes of organochlorine insecticides were used to control ectoparasites. Information is presented about their pattern of use and about the disposal of surplus sheep dip and the empty containers. Six river pollution incidents involving sheep dips in 1978 are recorded. The main geographical areas affected by headfly (Hydrotaea irritans Fall.) and the measures taken against them are noted.