河南省柞蚕区食蚕鸟类的生物学调查与防御措施     

周志栋  包志愿  崔自学  周其明  朱绪伟  张耀亭 《北方蚕业》2012,33(2):9-11

通过近五年在我省柞蚕区的调查,河南有食蚕鸟类20余种。调查了对柞蚕危害较重的几种鸟的形态特征及生活习性,并根据基本活动规律,制订了相应防御措施。  相似文献   

Rorippa sylvestris: A new troublesome weed in Swedish forest nurseries     

《Scandinavian Journal of Forest Research》2012,27(1-4):265-269

Yellow Cress (Rorippa sylvestris (L.) Besser), a weed difficult to control when established, has recently invaded Swedish nurseries. The properties of the species, as well as measures to avoid its further spreading, are described based on an exhaustive dissertation, other literature and own observations. It is most important to apply preventive measures to stop the species from being introduced and to observe the first establishment phases of the species. If it becomes established it is exceedingly important to prevent the spread of vegetative reproductive organs to unaffected areas.  相似文献   

工件防锈处理方法的研究与对比     

王莉芳  王琳  王炜  廉保军 《拖拉机与农用运输车》2019,(1):45-47

对农机中动力输出总成操纵滑杆,采用涂抹防锈油、电镀铬、电镀镍钴合金、QPQ盐浴复合处理技术等6种不同的防锈方法进行了对比试验。介绍了工件防锈处理研究与对比的方法,找到了满足拖拉机工况的防锈处理技术。  相似文献   

网络安全的隐患及管理          下载免费PDF全文

王忠亮 《现代农业研究》2019,(5):132-132

随着经济的发展,社会的进步,计算机技术得到了快速的发展,第三次科技革命促进全 国进入了计算机网络时代。我国接触计算机技术时间较短,但是也紧追时代的潮流,得到了快 速的发展,进入计算机时代得到的不仅仅只是机遇,越来越多的计算机网络安全问题涌现出来, 严重影响了我国计算机网络的安全稳定发展。本文主要就目前阶段计算机网络存在的问题展 开探究,找出造成网络安全的主要问题,并提出解决的措施。  相似文献   

生猪养殖常见病害的发生及预防措施研究          下载免费PDF全文

朱世蝶  李志伟 《现代农业研究》2019,(10):84-85

在我国农业生产领域之中,生猪养殖行业占据着重要地位,直接影响着我国农村经济 的发展水平,决定着农民的增收。本文将在阐述常见的生猪养殖病害和应对要点基础上,探讨 今后生猪养殖更加完善的病害预防措施。  相似文献   

采伐剩余物处理方式对2代杉木林碳储量的影响     

陈杰 《福建林业科技》2019,(2):1-6,17

在福建南平第1代杉木成熟林中设置固定标准地,采伐前测定每个标准地碳储量,采伐后采用5种方式处理采伐剩余物:全部收获(移走地面上全部有机剩余物,包括树木、林下植被和枯枝落叶)、全树收获(收获树木的全部地上部分)、树干和树皮收获(仅收获树干与树皮)、加倍采伐剩余物(仅收获树干和树皮,将全树收获处理的树枝和树叶移到这个处理中)、炼山(仅收获树干和树皮,然后火烧采伐剩余物),随后采用常规方法营造第2代杉木林。试验后12 a,对不同处理生态系统碳储量进行研究。结果表明:12年生第2代杉木林乔木层碳储量大小顺序为:加倍采伐剩余物(61.03 t·hm-2)>全树收获(57.57 t·hm-2)>全部收获(55.64 t·hm-2)>树干和树皮收获(54.38 t·hm-2)>炼山(49.00 t·hm-2);土壤层(0~40 cm)碳储量大小顺序为:加倍采伐剩余物(99.49 t·hm-2)>全树收获(95.63 t·hm-2)>树干和树皮收获(94.81 t·hm-2)>全部收获(91.55 t·hm-2)>炼山(91.23 t·hm-2,与第1代杉木林采伐前相比,第2代12年生杉木土壤层(0~40 cm)碳储量除了全部收获处理降低0.04 t·hm-2外,其他处理均有少量增加,但差异均不显著。第2代12年生杉木林生态系统总碳储量大小顺序为:加倍采伐剩余物(162.80 t·hm-2)>全树收获(155.56 t·hm-2)>树干和树皮收获(151.24 t·hm-2)>全部收获(149.14 t·hm-2)>炼山(142.29 t·hm-2)。加倍采伐剩余物处理、全树收获处理、树干和树皮收获处理、全部收获处理生态系统碳储量分别比炼山处理高14.41%、9.33%、6.29%、4.81%,但差异均达不到显著水平(P>0.05)。  相似文献   

A soil‐quality index for soil from Mediterranean forests     

Manuela Andrs‐Abelln  Consolacin Wic‐Baena  Francisco R. Lpez‐Serrano  Francisco A. García‐Morote  Eduardo Martínez‐García  Marta I. Picazo  Eva Rubio  Jose L. Moreno‐Ortego  Felipe Bastida‐Lpez  Carlos García‐Izquierdo 《European Journal of Soil Science》2019,70(5):1001-1011

  相似文献   

Chemical and organic immobilization treatments for reducing phytoavailability of heavy metals in copper‐mine tailings     

Mohammad Jamal Khan  David L. Jones 《植物养料与土壤学杂志》2008,171(6):908-916

This study was conducted to evaluate the efficiency of diammonium phosphate (DAP), agricultural limestone (lime), and green‐waste compost mixed with 30% treated sewage sludge (GCS) applied alone or in combination as chemical immobilization treatment using tomato as a test crop. Mine waste was collected from an abandoned copper‐mine tailing site at Mynydd Parys, Anglesey (UK). Lime was applied at the rate of CaCO₃ equivalent (CCE, pH = 7), DAP at the rate of 23 g P per kg substrate, and 10% by weight, GCS as sole application. Half rate of each amendment was also tested as a combined treatment and an untreated substrate (control). Plant‐available metals (Cd, Cu, Fe, Pb, and Zn) were measured in substrate with conventional diethylenetriaminepentaacetic acid (DTPA) and sequential Ca(NO₃)₂ extraction. Plant–dry biomass yield was significantly (p < 0.001) increased by the combined application of all the three amendments while sole application of DAP reduced yield by 4‐fold compared to unamended soil probably due to P toxicity. Addition of lime reduced the DTPA‐extractable Cu, Fe, and Zn by 75%, 81%, and 85%, respectively, while Pb availability was reduced by 88% in combined DAP + lime + GCS treatment compared to control. The extraction capacity of DTPA was higher than that of Ca(NO₃)₂ by 3‐fold for Cu and Fe, 8‐fold for Pb, and 2‐fold for Zn. The leaf‐tissue concentrations of Cu and Fe were reduced by 77% and 83% in the lime + GCS amendment, respectively, while both Pb and Zn were reduced by 89% and 33%, respectively, in substrate treated with the combined application of all three amendments. These results suggest that alkaline amendments (both lime and GCS) were effective in reducing the phytoavailability of Cu, Fe, and Zn while DAP mixed with either GCS or lime was effective in reducing Pb availability.  相似文献   

饲料中沙门氏菌的快速检测方法及预防措施     

刘红云 《现代农业科技》2020,(14)

本文介绍了近些年来饲料中沙门氏菌的检测方法,并提出了预防饲料中沙门氏菌污染的措施,具体包括饲料原料选择、生产加工过程的控制以及包装、运输、储存、使用过程的控制等方面内容,以期为饲料安全生产提供参考。  相似文献   

华东地区匍匐翦股颖褐斑病杀菌剂的田间防治效果   总被引：2，自引：1，他引：1  

孙晓燕  王兆龙  陈雅君 《草业科学》2008,25(6):89-92

采用常规喷雾法,选择室内药剂筛选中抑菌效果较好的7种杀菌剂,对匍匐翦股颖Agrostis stolonif-era果岭草坪褐斑病进行了发病前的预防和发病盛期的治疗2个阶段的田间试验。结果表明:百菌清与克露对匍匐翦股颖褐斑病发病的预防效果最好,田间预防效果可分别高达99.3%和98.5%,腈菌唑、退菌特、金雷多米尔、杀毒矾的预防效果其次,丙环唑的预防效果最差(73.0%);在草坪发病盛期,丙环唑的防治效果最好,3次防治效果均稳定在86%以上,8月21日的防治效果甚至高达95.9%;百菌清的3次防治效果也都稳定在80%以上,显著高于克露、腈菌唑、杀毒矾、金雷多米尔、退菌特等药剂。上述结果表示预防匍匐翦股颖褐斑病的药剂应选择百菌清或克露,但对已发生褐斑病的翦股颖则宜选择丙环唑或百菌清进行治疗。  相似文献