外源一氧化氮对百合鲜切花的生理效应

以硝普钠(SNP)为NO(一氧化氮)供体、亚甲基蓝(MB-1)为NO清除剂,重点研究NO对百合切花寿命与生理效应的影响.结果表明:0.1 mmol·L-1SNP释放的NO可显著延长百合切花的瓶插寿命,增大最大花茎,延长达到最大花茎所需时间,增加切花花枝鲜质量,缓解切花中可溶性蛋白质的降解速度,显著提高花瓣中抗氧化酶SO...     

云南稻种主要性状多样性分布中心及其规律研究

以云南省地州和县为单位对６１２１份云南地方稻种及其优异种质６０多人性状进行多样性和密度分布规律研究表明：（１）云南是中国稻种最大的遗传和生态多样性中心及优异资源的富集地区,尤其是滇西南的临沧、西双版纳、德宏、思茅和滇东南的文山共５个地州１３个县构成了云南稻种多样性中心,其稻种的多样性与生态多样性和民族的多样性息息相关,并与哈尼族善制梯田栽培稻谷有一定联系。（２）临沧地区不仅是云南稻种最大的遗传多样     

农村市场开发:从战术扩张到战略发展

农村市场是一个尚待开发的拥有着巨大潜力的市场。随着市场竞争的加剧 ,跨国企业的大规模进入 ,农民消费水平的提高 ,企业对这片市场的争夺在不久的将来会趋向白热化。探讨了企业开发农村市场的战略意义和应采取的措施。     

外源镧的吸附对红壤阳离子交换量和溶液组成的影响

采用不同用量外源锋土镧,研究其在红壤上的吸附及对红壤阳离子交换量和溶液组成的影响。结果表明,红壤对Ｌａ＾３＋具有较大的吸附容量和具有较高的可解吸性。当外源Ｌａ＾３＋浓度小于４００ｇｍ／ｋｇ时,被吸附的Ｌａ＾３＋具有较高的非交换性。阳离子交换量受外源镧的影响不显著;当外源镧浓度大于３００ｍｇ／ｋｇ时,土壤盐基饱和度与有效阳离子交换量显著降低,而交换性酸和交换性铝显著增加。浸出液中的盐基离子浓度随外源     

构树不同无性系间叶片营养成分及叶形的变化

以3个构树(Broussonetia papyrifera(L.)Vent.)无性系的叶片为试验材料,对其营养成分和叶片形态进行了测定和分析,揭示了其变化规律及其相关性。结果表明:花皮构树(构树1号)的粗蛋白质量分数最高,与红皮构树(构树2号)和白皮构树(构树3号)差异显著;粗纤维、粗灰分和钙的质量分数最低,钙、磷比也最低。3个构树无性系叶片中均含有17种氨基酸,其中花皮构树的氨基酸总量最大。构树不同无性系间叶片的面积、长度、宽度和叶柄长度无显著差异。粗蛋白质量分数、磷质量分数和氨基酸质量分数与叶面积、叶片长度呈正相关,而与叶柄长度呈负相关;粗纤维质量分数、钙质量分数和粗灰分质量分数与叶柄长度呈正相关。可见,花皮构树的叶片营养价值较好,其叶片更适合做畜禽饲料。     

Interactive effects of organic fertilizer, CaSO4 and amino acid Ca on Fuji apple in Burozem soil in China

A two-year trial was conducted to test the interactive effects of special-for-apple organic fertilizer, CaSO₄, and amino acid Ca on Fuji/Balenghaitang (Malus robusta Rehd.) rootstock in Burozem soil in China. Total Ca, exchangeable Ca, and fruit Ca were significantly improved by the soil application of CaSO₄ with the highest exchangeable Ca and fruit Ca observed in Fuji apple trees treated at the rate of 3.5 kg CaSO₄ per tree. 3.5 kg CaSO₄ was divided into two applications, with first application in the first month after full bloom, and the second in the second month after full bloom in summer, progressively to improve fruit Ca concentration. Dividing CaSO₄ into two applications in combination with organic fertilizer or amino acid Ca spray, proved to be more effective on improving the fruit Ca concentration, with the highest level of 179.17 mg/kg FW in Fuji apple trees treated with 2 kg CaSO₄ applied and amino acid Ca sprayed in the first month after full bloom, 1.5 kg CaSO₄ applied in summer, organic fertilizer applied in winter. Organic fertilizer applied in winter alone remarkably improved the fruit Ca concentration, as well as storage Ca in roots and stems, and the best effect was observed in Fuji apple trees which were supplemented organic fertilizer (10 kg) in winter and CaSO₄ (1 kg) in the first month after full bloom per tree. The effect on Ca increment became less pronounced when the amount of organic fertilizer reached 15 kg or CaSO₄ was more than 3.5 kg per tree. There was a positive correlation between the Ca/Mg ratio in soil and fruit, exchangeable Ca, and fruit Ca concentration, while a negative correlation was observed between the N/Ca ratio in fruit, available P, available K in soil, and fruit Ca concentration. Both N/Ca ratio and Ca/Mg ratio in fruit were affected by different fertilization regime, and bitter pit incidence at the end of storage kept acceptable only if N/Ca < 17 and Ca/Mg ≥ 7 at harvest. The commercial fertilization regime turned out to be organic fertilizer in combination with CaSO₄ applied in soil in winter, amino acid Ca sprayed in the first month after full bloom, and CaSO₄ applied in soil in summer. __________ Translated from Journal of Fruit Science, 2007, 24(1): 6–10 [译自: 果树学报]     

太岳山油松人工林土壤温度状况的初步研究

该文在定位观测的基础上，研究了太岳山油松人工林生态系统生长季节的土壤温度分布、温度梯度以及热力流向；从定性走向定量，为林业生产活动提供理论依据。     

图书馆的人本管理与和谐发展

从树立以人为本的观念、对馆员实行人性化关怀、重视人才培养和营造和谐环境等方面,探讨了高校图书馆加强人性化管理和服务的对策。        

活性氧化及其清除剂诱导抗病作用与影响膜脂过氧化作用的关系

细胞内外 AOS的快速增加可导致膜脂过氧化 ,甚至直接损伤核 DNA和失活蛋白质 ,造成细胞丧失生活能力〔2〕,诱导抗氧化防卫基因、植保素合成基因和与系统获得抗性 (SAR)细胞内外 AOS的快速增加可导致膜脂过氧化 ,甚至直接损伤核 DNA和失活蛋白质 ,造成细胞丧失生活能力〔2〕,诱导抗氧化防卫基因、植保素合成基因和与系统获得抗性 (SAR)有关的基因的表达以及诱导程序性细胞死亡〔3〕。百草枯 (PQ)是一种特异性的 O·2 产生剂。我们的研究表明 ,PQ在导致 O·2 产生的同时 ,也使 SOD活性增加 ,并诱导了对稻白叶枯菌的系统抗性。而 O…