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41.
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客土喷播-高速公路边坡绿化防护新技术 总被引:4,自引:0,他引:4
徐一斐 《湖南环境生物职业技术学院学报》2005,11(4):309-312
客土喷播是高速公路边坡绿化防护的一门新技术,本文以探索其生态效益、经济效益及社会效益为目的,着重阐述了客士喷播的工程技术、工艺流程、施工过程及方案,并通过试点工程试验结果,证实了该项技术的可行性和优越性. 相似文献
43.
Deivis E. Lujan-Rhenals Rubén O. Morawicki Steven C. Ricke 《Journal of environmental science and health. Part. B》2013,48(4):305-311
The objective of this research was to determine the minimum inhibitory concentration of 5-hydroxymethyl furfural, furfural, and acetic acid on Saccharomyces cerevisiae (NRRL Y-2233) and Zymomonas mobilis subspecies mobilis (NRRL B-4286) in both detoxified hydrolyzed soybean meal and synthetic YM broth spiked with the three compounds. Soybean meal was hydrolyzed with dilute sulfuric acid (0.0, 0.5, 1.25, and 2.0% wt v?1) at three temperatures (105, 120, and 135°C) and three durations (15, 30, and 45 min) followed by detoxification with activated carbon. Of all the combinations, only the treatments obtained at 135°C, 2.0% H2SO4, and 45 min and the one at 135°C, 1.25% H2SO4, and 45 min showed inhibition in the growth of the tested microorganisms. Spiked YM broths showed inhibition for the highest levels of inhibitors, either applied individually or in combination. 相似文献
44.
C. M. Tu 《Journal of environmental science and health. Part. B》2013,48(3):369-378
Abstract Two pyrethroid insecticides were compared with two fungicides for their effects on the rhizobial and seedling components of the N2‐fixing symbiosis in soybeans (Glycine max Merr. variety Olinda). In vitro growth of Rhizobium japonicum RI16, was inhibited in the order of HgCl2 > thiram > cypermethrin > permethrin. The emergence of the seedlings was stimulated by all chemicals tested. Also, none of the pesticides studied had any significant effect on N2 fixation (acetylene reduction), at the dosages used. Consequently, yields of the various organs were also not significantly influenced by the chemicals. 相似文献
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针对大豆深加工高浓度有机废水厌氧出水的特点,采用移动床生物膜反应器-沉淀池-厌氧池(MBBR-SA)工艺进行处理,重点考察了其COD去除、脱氮以及污泥减量化的性能。处理前厌氧出水水质参数为COD 1 350~1 851 mg/L、TN 45~73 mg/L和TP 35~55 mg/L。结果表明,经过70 d的运行,在最佳水力停留时间(HRT)1.68 d与最佳回流比0.75条件下,出水平均COD、TN和NH4+-N浓度分别为91.5、12.4和11.4 mg/L,分别达到了《城镇污水处理厂污染物排放标准》二级标准、二级标准和一级B标准,其平均去除率分别为96.0%、87.4%和88.3%;该工艺未排放剩余污泥,其表观污泥产率为0.13,比MBBR降低了43.5%,具有明显的污泥减量化特性。 相似文献
47.
T. Wagner L. M. Arango Isaza S. Grundmann U. Dörfler R. Schroll M. Schloter A. Hartmann H. Sandermann D. Ernst 《Water, Air, & Soil Pollution: Focus》2008,8(2):155-162
The gene transfer from glyphosate tolerant soybean to Bradyrhizobium japonicum was evaluated in a free-air lysimeter experiment under natural conditions and increasing selection pressure, to monitor for the probability of horizontal gene transfer (HGT). A large volume lysimeter study that offers conditions comparable to normal farming was conducted in 2004 and 2005 with Roundup Ready® (RR) soybean and Roundup® application according to agricultural practice. Analysis of nodules showed, as expected, the presence of the transgenic 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS). However, in bacteroids that were isolated from nodules and then cultivated for several rounds in the presence of high levels of glyphosate, the EPSPS gene could no longer be detected. This indicates no stable HGT transfer of the whole EPSPS gene under field conditions. 相似文献
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Summary. Plants attacked by herbivorous insects emit a blend of volatile compounds that serve as important host location cues for parasitoid
wasps. Variability in the released blend may exist on the whole-plant and withinplant level and can affect the foraging efficiency
of parasitoids. We comprehensively assessed the kinetics of herbivore-induced volatiles in soybean in the context of growth
stage, plant organ, leaf age, and direction of signal transport. The observed patterns were used to test the predictions of
the optimal defence hypothesis (OD). We found that plants in the vegetative stage emitted 10-fold more volatiles per biomass
than reproductive plants and young leaves emitted >2.6 times more volatiles than old leaves. Systemic induction in single
leaves was stronger and faster by one day in acropetal than in basipetal direction while no systemic induction was found in
pods. Herbivore-damaged leaves had a 200-fold higher release rate than pods. To some extent these findings support the OD:
i) indirect defence levels were increased in response to herbivory and ii) young leaves, which are more valuable, emitted
more volatiles. However, the fact that reproductive structures emitted no constitutive or very few inducible volatiles is
in seeming contrast to the OD predictions. We argue that in case of volatile emission the OD can only partially explain the
patterns of defence allocation due to the peculiarity that volatiles act as signals not as toxins or repellents. 相似文献
50.
昼夜增温对大豆田土壤N2O排放的影响 总被引:4,自引:1,他引:3
通过田间试验,用静态箱-气相色谱法测定N2O排放通量,研究昼夜增温对大豆田土壤N2O排放的影响.结果表明,增温没有改变大豆田土壤N2O排放通量的季节性变化规律.整个生长季,与对照相比,增温土壤N2O平均排放通量增加了17.31%(P=0.019),累积排放量显著增加了20.27%(P=0.005).对照与增温处理土壤N2O排放通量与土壤温湿度均呈显著性相关关系,对照与增温土壤的N2O排放温度敏感系数分别为3.75和4.10.整个生育期,增温显著增加了植株地上和总生物量、叶片硝酸还原酶活性和全氮含量,显著降低了叶片NO3--N含量;显著增加了土壤NO3--N含量,但对土壤有机碳及全氮含量没有显著影响.本研究表明,昼夜增温显著增加了大豆田土壤N2O的排放. 相似文献