贵州丹寨废弃矿区典型农作物中汞、砷含量的分布特征及差异分析

为摸清废弃矿区重金属汞(Hg)、砷(As)在典型农作物中的含量和空间分布特征,于丹寨金汞矿废弃矿区选取当地主要种植作物-玉米和水稻,采用冷原子荧光光谱法和电感耦合等离子体质谱法分别对农作物Hg、As进行定量分析.结果 表明:玉米植株中,茎叶Hg、As出现部分超标点,点位超标率分别为42.11％和5.26％,玉米果实中H...     

财政部将对秸秆能源化生产企业财政补助

为减少和杜绝我国农村一些地区焚烧农作物秸秆行为,财政部近日表示,中央财政将安排资金支持秸秆产业化发展。支持的对象是从事秸秆成型燃料、秸秆气化、秸秆干馏等秸秆能源化生产的企业,支持资金主要采取综合性补助方式,支持企业收集秸秆、生产秸秆能源产品并向市场推广。     

Single and joint stress of acetochlor and Pb on three agricultural crops in northeast China

In order to evaluate ecological risk of agrochemicals in agricultural environment, single and joint toxic effects of an important herbicide and a typical heavy metal on root elongation of crops were investigated. Seeds of the three crops including wheat （Triticum aestivum）, Chinese cabbage （Brassica pekimensis） and soybean （Glycine max） as the main crops in northeast China were exposed to acetochior as a herbicide and lead （Pb） as a heavy metal using the pot-culture method, and meadow brown soil as one of the main soils distributed in northeast China was applied in the investigation. The results indicated that the interactive effects of the two pollutants on root elongation of the three crops were very complicated although they had markedly significant （P〈0.01） linear interrelationships based on the regression analyses. When the concentration of added Pb^2＋ reached 200 mg/kg, acetochlor and Pb had an antagonistic effect on the inhibition of root elongation of the three crops. However, acetochlor and Pb had significantly （P〈0.05） synergic effects on the inhibition of root elongation when concentration of added Pb^2＋ was up to 1000 mg/kg. At the low concentration of added Pb, joint toxicity of acetochlor and Pb was more dependent on the concentration of Pb. Among the three crops, wheat was the most sensitive to the toxicity of Pb and Chinese cabbage was the most sensitive to the toxicity of acetochlor.     

国际

国际绿色区域协会联盟在瑞士成立,澳大利亚人均二氧化碳排放量居世界之首,泰国警察街头回收食用油,北欧五国呼吁全球应对北极冰融问题,淡化海水浇灌农作物又现新问题,     

SO2对作物幼苗超氧化物歧化酶同工酶的影响

SO_2伤害小麦,绿豆,豇豆、四季豆、南瓜,丝瓜幼苗后,引起超氧化物歧化酶(SOD)和过氧化物酶(POD)同工酶谱出现新酶谱带,而且随着污染次数增加,此新同工酶谱带越明显,说明SOD同工酶的变化与SO_2伤害有一定关系,经分析新出现的酶谱带属Cu-Zn-SOD类型。     

我国酸雨危害及防治对策

介绍了我国酸雨的危害及特点，并从多方面提出了对酸雨防治对策的建议。     

陕西省秸杆资源利用现状与合理开发

随着农村经济和生产力的发展,部分地区农作物秸秆烧、沤、饲的传统利用方式已转变为堆积在田头、路边或作为废弃物付之一炬的处理方式。这不仅浪费了宝贵的自然资源,而且妨碍交通,污染环境,浩成烧毁树     

广安县农业气候资源定量分析与评价

本文就广安县农业气候资源及其要素对农作物的适宜性进行了定量分析与评价,找到了气候资源的优势和限制因素,提出了开发、利用措施。     

沼气发酵液对农作物病害的防治

有机废弃物经堆沤处理,可增强土壤肥力,并抑制作物根部病害的发生。沼气发酵液(简称沼液)是有机废弃物经厌氧发酵后的残留物质,其中富集的微生物菌群、大量的微量元素和各种各样的生物活性物质对作物病菌有显著的抑制作用。