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以绿色木霉(Trichoderma viride)、康氏木霉(Trichoderma koningii),以及二株未知种名的木霉菌株(Trichoderma spp.)为供试菌,采用对峙培养测定其对棉花黄萎病菌(Verticillium dahliae)的抑制作用,并研究了四种木霉菌产生的非挥发性代谢物对菌丝干重的影响。结果表明:在对峙培养中,木霉菌对棉花黄萎病菌均有明显抑制作用,木霉菌产生的非挥发性代谢物可以强烈抑制棉花黄萎病菌生长,明显降低其菌丝干重,并具有热稳定性。光学显微镜下观察,木霉菌丝在棉花黄萎病菌丝上平行或波浪式生长且棉花黄萎病菌丝出现细胞原生质浓缩和菌丝断裂等现象。 相似文献
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以小麦麸皮为原料,用超声处理结合蒸煮法制备木聚糖,分别研究了不同料液比、超声时间、超声温度、蒸煮时间、蒸煮温度对木聚糖提取率的影响,以木聚糖提取率为响应值,应用响应面分析法(RSA)对木聚糖提取工艺进行了优化,确定最优工艺参数为:料液比1∶20,超声时间20min,蒸煮温度100℃,蒸煮时间2h。在此条件下木聚糖的提取率为59.87%。 相似文献
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玉米小斑病是我国南方玉米产区主要叶部病害之一,为探索防治玉米小斑病的生物农药,采用实验室培养皿理想试验与玉米苗盆栽试验,观察木霉菌可湿性粉剂对病原菌菌丝生长、玉米叶片变化及玉米防御反应相关酶活的测定。实验室结果表明,木霉菌可湿性粉剂强烈抑制玉米小斑病菌菌丝生长;盆栽结果表明,喷洒木霉可湿性粉剂抑制了小斑病菌对玉米叶片的侵染。同时喷施12h、24小时后木霉菌可湿性粉剂诱导玉米防御相关的POD和PAL酶活升高。 相似文献
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低温及赤霉素处理丝棉木种子对其发芽力的影响 总被引:1,自引:0,他引:1
以丝棉木种子为材料,采用不同浓度赤霉素处理,结合低温层积,对丝棉木种子发芽进行试验研究.结果表明:赤霉素处理能极显著提高丝棉木种子发芽率、发芽势和发芽指数.经过低温处理30 d的丝棉木种子,播种前用赤霉素浓度150mg/L浸泡24 h可有效提高种子的发芽力;未经低温处理的丝棉木种子,播种前用赤霉素浓度3 000 mg/L浸泡24 h,可有效提高种子的发芽力,从而取代低温层积处理的过程. 相似文献
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本研究采用小区试验方法,围绕利用微生物调控土壤质量的目标,利用具有土壤改良活性、并且适应于潍坊土壤生态的微生物,研究以生物质材料及水为载体的菌剂制剂化技术,研制开发适合常规施肥和水肥一体化体制下的液态、固态菌剂及不同菌剂的配伍;探索菌剂的田间施用技术,分析复合微生物菌剂对土壤生态改良的效果,考量其对烟草农艺性状的影响,达到土壤改良和调节产量与品质的协调。结果表明,木霉菌剂在烟草不同生长时期,对烟草的各个农艺性状,包括株高、茎粗、叶长、叶宽、叶片数及叶面积等都具有不同程度的促进效果。 相似文献
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为了研究种翅和贮藏温度对木地肤(Kochia prostrata)种子萌发和种子寿命的影响,试验将收获的种子置于黑暗条件下,采用常温、冷藏(-18℃)分别贮藏3个月、6个月、9个月、12个月、15个月,然后测定种子发芽率.结果表明,贮藏15个月后,常温贮藏去翅种比有翅种发芽率高13.44%;冷藏条件去翅种发芽率比有翅种... 相似文献
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The natural ventilation in a novel built-in photovoltaic-Trombe wall (BiPV-TW) was numerically simulated by CFD method. The effect of solar radiation, channel width and height on the air flow pattern and ventilation rate was analyzed. Results show that the solar radiation, channel width and height influenced the ventilation rate remarkably. As the solar radiation and BiPV-TW height increased,the ventilation rate increased. As the channel width increasing from 0.1 m to 0.4 m, the ventilation rate monotonously increased. However, when the channel width exceeded 0.5 m, the reverse flow was formed in the top zone and the ventilation rate decreased. A maximum air volume flow rate was achieved when the channel width was approximately equal to 0.4 m in a 3 m height model. The channel width was the dominant factor that influenced the flow pattern in the channel. When the channel width was smaller than 0.4 m, the airflow was thermally stratified laminar flow. When the channel width exceeded 0.5 m, thermally stratified flow disappeared due to the reverse flow formed in the top zone and the laminar flow became turbulent. 相似文献
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An experiment is conducted on the impact of green roof on Indoor Human Thermal Comfort. The result shows that the temperatures of the building walls and indoor air fall for certain degrees, and that is good. But unfortunately, the relative humidity of the indoor air rises. Totally speaking, the whole effect is changed from feeling warm to basically acceptable. When the requirement of the indoor environment is high, it is impossible to be satisfied by exploiting green roof solely, other methods, such as using night ventilation, electric fans or air-conditioners, should be taken at the same time. 相似文献
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The simulation model of hybrid radiant cooling floor and displacement ventilation air conditioning system was built and analyzed by software EnergyPlus. By comparing the simulation results and experimental data, it is shown that the simulated indoor air temperature and cooling capacity provided by radiant floor was ±7% deviated from the experimental data. Based on the model, with the change of supply air parameters or supply water parameters, the cooling capacity provided by radiant floor and displacement ventilation, surface temperature of radiant floor, indoor air average temperature, AUST temperature were obtained. Combined with the indoor thermal comfort model, when indoor thermal comfort index PMV varied between -0.5 and 0.5, the recommended supply air and supply water parameters were obtained to provide reference for engineering design and application. 相似文献
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Based on the conception of green building, this paper discusses the effect of curtain wall in adjusting the interior environment quality, reducing building energy consumption, and emphasizes the curtain wall technology in natural lighting, natural ventilation, as well as building energy efficiency. 相似文献
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Indoor thermal comfort can be significantly improved by natural ventilation with reasonable architectural design. In order to compare natural ventilation effect, the distribution of velocity field, temperature field and the PMV in different architecture layout and orientation design were analyzed with house types in Best House Type Competition. It was found that indoor natural ventilation effect was obviously improved by means of altering the layout and orientation, where the maximum velocity varied from 0.24m/s to 0.82m/s. And the temperature decreased 0.9℃ and the value of PMV was more approximate to comfort. 相似文献
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In order to establish “Evaluation Standard for indoor thermal environment of civil buildings”,acceptable temperature range of indoor environment without air conditioning and heating in hot summer and cold winter zone is indispensable.A two-year field measurement and questionnaire survey were carried on from 2007 to 2009 in Chongqing,which focused on office buildings and residential buildings.After the analysis of indoor and outdoor environment,occupants evaluation and thermal adaptability,a method to obtain the acceptable temperature range,was proposed.Regressing data by temperature range,and combined with human physiological and psychological experiments,the acceptable temperature range of environment without air conditioning and heating in Chongqing was determined according to outdoor air temperature changes in one year.A Comparation of methods to determine the acceptable temperature range in some international standards was discussed. 相似文献
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巴渝地区夯土民居室内热环境 总被引:4,自引:0,他引:4
传统民居的传统生态建造经验与价值已得到广泛认可,巴渝地区因特殊的地形与气候,传统民居在热环境的营造上有自身的特点。以重庆江津区龙塘村夯土民居为研究对象,以实地测量的冬季室内热工参数为基础,运用软件模拟分析,对民居全年室内热环境进行评价,发现夯土墙对改善夏季热环境更为有利,夯土民居冬季室内热环境远比夏季差;民居建筑中阁楼空间在调节室内热环境方面作用显著,具有冬季保温,夏季隔热的作用。 相似文献
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In this paper the low-temperature hydraulic floor heating system of a residence in Chongqing was tested. The influence of this system and the heat pump air conditioning system on indoor thermal comfort and operation cost was analyzed and compared. The effect of heat dissipation by radiation and convention of the floor was analyzed. It shows the feasibility and advantage of floor heating system in Yangtse River Region. 相似文献
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以深圳地铁车公庙交通枢纽7 & 9号线车站深基坑工程为研究背景,选取典型的监测断面,埋置混凝土应变计,进行地下连续墙的内力测试,分析了连续墙在深基坑开挖过程中的内力变化规律,并对连续墙的安全性进行了评价,得到以下结论:随着基坑开挖深度的增加,地下连续墙的内力变化越发明显,基坑负二层和负三层开挖对连续墙的内力变化影响较大,应重点关注和监测;根据现场测试数据得到两侧地下连续墙的内力变化并非完全一致,主要受到紧邻基坑开挖和周边建筑物的影响;最后计算得到地下连续墙处于安全状态。 相似文献