Agronomic Valorization of Olive Mill Wastewaters: Effects on Medicago sativa Growth and Soil Characteristics          下载免费PDF全文

Ali Mekki  Awatef Aloui  Zouheir Guergueb  Mohamed Braham 《洁净——土壤、空气、水》2018,46(9)

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Nitrous Oxide and Methane Emissions in Spring Maize Field in the Semi‐Arid Regions of Loess Plateau     

《洁净——土壤、空气、水》2017,45(1)

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Mycosynthesized Silver Nanoparticles as Potent Growth Inhibitory Agents Against Selected Waterborne Human Pathogens     

《洁净——土壤、空气、水》2017,45(4)

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光照、温度和盐分对囊果碱蓬种子萌发的影响   总被引：26，自引：3，他引：26  

王雷  田长彦  张道远  周智彬 《干旱区地理》2005,28(5):670-674

囊果碱蓬种子在3种光照、5个温度梯度和5个盐分梯度条件下萌发,测定种子萌发的最佳条件。结果表明：在光照和黑暗条件下,种子萌发率无显著差异。种子萌发的最适温度为30℃。随NaCl浓度增高囊果碱蓬种子萌发率降低,直至为零。不同温度和盐分以及二者的交互作用对囊果碱蓬种子萌发的影响都是极显著的。在最适温度时,种子耐盐临界值为488．89mmol／L,极限值为933．34mmol／L。  相似文献   

低温处理对天然牧草种子发芽的影响   总被引：1，自引：0，他引：1  

云文丽  师桂花  侯琼 《内蒙古气象》2010,(6):29-31

温度是影响牧草种子发芽的主要因素之一。本研究以大针茅和克氏针茅种子为研究对象,采用低温处理和常温发芽方式进行发芽试验,分析低温处理对两种牧草种子发芽率和发芽势的影响。结果表明:低温处理不同程度地提高了两种牧草种子的发芽率,同时也加快了起始发芽时间。对于大针茅而言,低温处理和常温发芽的种子发芽势从开始发芽到最后都体现了由慢变快再变慢的趋势,温度处理对其发芽历期的影响不很明显。而克氏针茅低温处理和常温发芽的种子发芽势却体现了相反的变化趋势,经过低温处理的种子发芽势逐渐变慢,发芽历期长,常温发芽的种子发芽势逐渐变快,发芽历期短。  相似文献   

The Effect of Atmospheric Organic Compounds on the Fe-Catalyzed S(IV) Autoxidation in Aqueous Solution     

Irena Grgić  Andreja Dovžan  Gorazd Berčič  Vida Hudnik 《Journal of Atmospheric Chemistry》1998,29(3):315-337

Laboratory experiments were conducted with real atmospheric aerosol particles as well as with synthetic solutions under dark conditions, to simulate some of the chemical features of aerosols. In solutions obtained by the leaching of aerosols (size range >D _ae: 0.4–1.6 m) that contained sufficient amounts of transition metal ions (e.g. Fe) and organic species (e.g. oxalate), S(IV) oxidation rates were significantly lower than those expected from the Fe-catalyzed S(IV) autoxidation in Milli-Q water. The results suggest that oxalate is responsible for much of the observed inhibition. Acetate and formate also inhibit the reaction, but to a much lesser extent. Oxalate has a strong inhibiting effect on the Fe-catalyzed S(IV) autoxidation at all investigated pH values (2.8, 3.7 and 4.5). It was established that Fe(III)-oxalato complexes affect the redox cycling of Fe(II)/Fe(III) and that the observed decrease of the reaction rate is caused by the reduced amount of catalytically active Fe(III) due to the complexation with oxalate. For the system Fe-S(IV)-O₂-oxalate at initial pH 3.7 the reaction rate was calculated using exponential simplification to account for oxalate influence on the amount of free Fe(III) by the following equation:–r_S(IV) = k · [S(IV)] · [Fe(III))] · e ^-b·[Ox]  相似文献   

温度对皱紫菜(Pyropia crispata)壳孢子萌发及叶状体形态建成的影响     

田翠翠  陆勤勤  朱建一  邓银银  胡传明  许广平  周伟 《海洋与湖沼》2020,51(5):1144-1150

近几年,紫菜"高温烂菜"现象频发,为开发耐高温紫菜栽培种质,本文研究了4种温度(15、20、25、28℃)对皱紫菜壳孢子萌发及叶状体形态建成的影响,并观察了藻体的繁殖特性。结果显示,在试验设定的培养条件下,适宜皱紫菜壳孢子萌发生长温度为20—25℃,最适温度为20℃。皱紫菜壳孢子幼苗萌发初期细胞分裂为横分裂,叶状体细胞呈直线排列,生长至7—10个细胞后,细胞开始出现纵分裂。15、20℃温度组藻体多为不规则的半圆形裂片。25、28℃温度组藻体多为细长型叶片。有性生殖是皱紫菜主要的繁殖方式,但15—20℃培养组的部分藻体能够少量形成并放散类似无性生殖的单孢子并萌发形成叶状体。  相似文献   

含动力学抑制剂的聚合醇钻井液水合物抑制性研究     

刘天乐  蒋国盛  宁伏龙  张凌  涂运中 《地质科技情报》2010,29(1)

对含动力学抑制剂的聚合醇钻井液水合物抑制性进行了实验研究。实验结果表明,加入PVP的水基聚合醇钻井液能够有效抑制甲烷水合物的生成,而PVP(K90)的抑制效果明显优于PVP(K30)。在温度为0℃、初始压力为18 MPa的条件下,只需向水基聚合醇钻井液中添加1%的PVP(K90),就能够确保循环管路中20 h内不会生成水合物。  相似文献   

IMPROVEMENT OF SANDY SOIL WITH WATERCONSERVING MEMBRANE AND ITS EFFECT ON CROP GROWTH   总被引：1，自引：0，他引：1  

LIXiu-jun CUIXiang-hao LIQu-sheng 《中国地理科学(英文版)》2005,15(1):64-69

1INTRODUCTIONArid, semi-arid, and semi-humid areas abound in sandysoil, which causes water to leak into deep soil orgroundwater so that soil′s water-conserving capabilitybecomes lower and water is used with low efficiency.Water is one of the important fa…  相似文献   

Influence of temperature and salinity on germination of eelgrass (Zostera marina L.) seeds     

Jinhua Pan  Xin Jiang  Xiaojie Li  Yizhou Cong  Zhuangzhi Zhang  Zhiling Li  Weili Zhou  Houwei Han  Shiju Luo  Guanpin Yang 《中国海洋大学学报(英文版)》2011,10(2):147-152

Seagrass restoration as part of ocean ecosystem protection has been launched for many years all over the world, but intensive research on this subject in China has just begun in recent years. Seed broadcasting has been widely accepted as the most potentially useful method for seagrass restoration over large areas. We examined the influence of key environmental factors on seed germination to help promote eelgrass bed restoration. Under anoxic conditions, the influence of temperature and salinity on the germination rate of eelgrass (Zostera marina L.) seeds was examined at different combinations of four temperatures (4, 9, 14, and 24°C) and nine salinities (5 to 45, increment of 5). The effect of significant interaction of temperature and salinity on germination rate was observed (ANOVA) (P<0.001). The highest germination rate (83.3 ± 3.5)% was reached in 8 weeks at 14°C and salinity 5. Higher temperature significantly increased the germination rate at salinity 5 (P<0.001) during the whole observation period except for 24°C, while lower salinity significantly increased the germination rate at 14°C (P<0.001). Although significant interaction was found between temperature and salinity (P<0.001), the influence of salinity was stronger than that of temperature for the germination of eelgrass seeds. These results provide useful information for the propagation of artificial seedlings for seagrass restoration in China.  相似文献