油料能源树种用途的竹柏无性系选择   总被引：3，自引：0，他引：3  

周俊新  李宝银  林小青  黄云玲  郑达华 《林业资源管理》2014,(6)

选择优良无性系,是竹柏遗传改良的重要途径之一。无性系测定结果表明,表型优株建立的竹柏无性系间,千粒重、单位面积种子产量、种子含油率均存在极显著差异,进一步选择是必要的;竹柏千粒重、单位面积种子产量、种子含油率无性系重复力分别为0.885,0.784,0.804。通过聚类分析,根据3个主要经济性状的综合表现,精选获得的SM2,NS1,NY2,SM1等4个优良无性系的千粒重、单位面积种子产量、种子含油率等性状,与参试群体总体水平比较,遗传增益分别达15.68%,50.62%,5.55%,与CK比较,遗传增益分别达32.38%,638.10%,10.68%,且均具较强适应性和较高稳定性。NS1,SM2适宜中等以上的立地条件,即在Ⅰ、Ⅱ类地适宜推广;NY2,SM1适宜在Ⅰ,Ⅱ,Ⅲ类地推广。  相似文献   

Study of a Novel Vertical Flow Constructed Wetland System with Drop Aeration for Rural Wastewater Treatment     

Zou  Juan  Guo  Xuesong  Han  Yunping  Liu  Junxin  Liang  Hanwen 《Water, air, and soil pollution》2012,223(2):889-900

Constructed wetlands are recognized as a reliable technology for rural wastewater treatment. However, conventional constructed wetlands face problems with low pollutant removal efficiency and limited oxygen transfer capability. Therefore, a novel vertical flow constructed wetland (VFCW) system with drop aeration was developed in this study. Two pilot-scale vertical flow constructed wetlands of 0.75 m² each were constructed with the same dimensions and configuration but different media, one of which (named as CW₁) was filled with a 1:1 mixture (by weight) of zeolite and dolomite and the other (named as CW₂) with the same zeolite only. The oxygen transfer capability of a multilevel two-layer drop aeration device, organics and nitrogen removal of CW₁ and CW₂, and pollutant distribution along the depths of CW₁ and CW₂ in different operational phases were studied. The results demonstrated that compared with the direct drop aeration process, the multilevel, two-layer drop aeration device supplied 2–6 mg/L higher dissolved oxygen per meter of drop height, and after installation of the six-level, two-layer drop aeration devices, the 5-day biochemical oxygen demand removal load was improved from 8.1 to 14.2 g m⁻² day⁻¹ for CW₁. With regard to the different filter media, nitrogen removal was improved by the adsorption of zeolite in the first year, with 5–36% higher NH₄⁺–N removal efficiency of CW₂ compared with that in CW₁. Since it did not have a significant positive effect on phosphate removal, dolomite can be replaced by zeolite. The chemical oxygen demand removal mainly took place in the upper 15-cm filter layer in different operational phases, while nitrogen distribution along the depths of the VFCWs was different in different operational phases. In addition, as no operational problems occurred, the vertical flow constructed wetland system with drop aeration is an appropriate alternative for rural wastewater treatment, with numerous advantages of low capital and operation costs, no energy consumption, easy maintenance, high hydraulic loading rate, high pollutant removal efficiency, and no clogging.  相似文献   

Performance and Bacterial Community Diversity of a Full-Scale Biofilter Treating Leachate Odor in a Sanitary Landfill Site     

Lin Li  Yunping Han  Junxin Liu 《Water, air, and soil pollution》2012,223(9):5599-5611

Odors, such as the malodorous and toxic hydrogen sulfide (H₂S), are released during leachate collection, storage, and treatment. A full-scale biofilter was applied to treat H₂S emitted from a leachate equalization basin in a sanitary landfill site. The inlet concentration of H₂S was 26.3?C213.0?mg?m^?3. In steady state, total removal efficiency was over 90?% in summer and over 80?% in winter. The maximum elimination capacity achieved 9.1?g?m^?3?h^?1 at a loading rate of 10.5?g?m^?3?h^?1. The biofilter was effective at reducing H₂S. Factors on the level of H₂S inlet concentration and performance of the biofilter were investigated. The H₂S inlet load and removal efficiency relied on ambient and biofilter temperature, respectively. The water containing rate and relative humidity presented seasonal variation, according to which the interval period of irrigation could be optimized. The main product of H₂S degradation was sulfate, and sulfur also could be observed from the biofilter. Spatial and temporal shifts in bacterial community composition in the biofilter were determined by polymerase chain reaction-denaturing gradient gel electrophoresis followed by DNA sequence analysis. The present study revealed a correlation between biofilter performance and bacterial community structure, especially in a real application case.  相似文献   

播种量对冀北地区2个荞麦品种产量的影响     

曹丽霞  周海涛  张新军  石碧红  张丽霞  李云霞  刘君馨  白静  赵世锋 《作物杂志》2021,37(5):140-653

试验于2018-2019年连续进行2年,采用裂区设计,以甜荞品种冀甜荞1号和苦荞品种冀苦荞1号为材料,设置5个播种量处理,研究了播种量对不同荞麦农艺性状及产量的影响。结果表明,播种量对冀甜荞1号的株高、主茎节数和千粒重影响不大,对主茎分枝数、花序数、单株粒数、单株粒重以及产量有一定影响,播种量在120万~180万粒/hm²之间均能达到高产,适宜播种量为120万粒/hm²。不同播种量对冀苦荞1号的主茎节数和千粒重影响不大,对株高、主茎分枝数、花序数、单株粒数、单株粒重以及产量都有一定影响,播种量在90万~150万粒/hm²之间均能达到高产,适宜播种量为90万粒/hm²。  相似文献   

浅析中荷合作雷州半岛红树林项目的管理与成效     

蔡俊欣 《热带林业》2008,36(1):12-15

从项目管理的角度对中荷合作雷州半岛红树林综合管理和沿海保护项目的实施和成效进行分析和小结,认为更新观念、科学设计、管理体系、合理配备人员和良好合作机制是项目取得成功的关键因素。  相似文献   

对变形钢筋套管连接技术的探讨     

刘军兴 《森林工程》1999,15(4):32-33

变形钢筋套管连接技术是采用机械式钢筋连接方法解决工程中的钢筋连接问题。本文从工作机理、挤压设备、操作工艺及技术经济等方面探讨了该技术在工程实践中的应用.并分析了技术经济特点及该技术的发展前景。  相似文献   

提高西葫芦采种质量的技术措施     

武峻新 《中国种业》2005,(6):47-48

在西葫芦制种过程中,及时防治病虫害将有利于西葫芦种子发育和提高结籽率.  相似文献   

A study on JA-and BTH-induced resistance of Rosa rugosa ‘Plena’ to powdery mildew(Sphaerotheca pannosa)     

Junxin Yan  Yanan Deng  Jia Yu  Yongqiang Zhang  Defu Chi 《林业研究》2018,(3)

Different concentrations of jasmonic acid(JA)and benzothiadiazole(BTH) were sprayed on 2-year-old Rosa rugosa‘Plena’ seedlings. The induced resistance of JA and BTH to Sphaerotheca pannosa(Wallr.) and the changes of their related physiological indices were investigated. Results showed that JA and BTH treatments had inhibitory impacts on S. pannosa infection. The optimal concentration of JA and BTH was 0.5 mmol/L for the disease-resistance induction of the leaves, its inductive effect was up to 66.36% for BTH and 54.49% for JA. Our results confirmed that exogenous JA and BTH significantly improved R. rugose ‘Plena’ resistance to S. pannosa. When treated with JA and BTH, activities of the three defense enzymes(POD, PPO, and PAL) increased significantly.Contents of total phenolics, flavonoids, and lignin also increased significantly. It is inferred from these results that exogenous JA and BTH could improve the resistance of R.rugose ‘Plena’ to S. pannosa through enhancing activities of the defensive enzymes and accumulation of secondary metabolites in the leaves.  相似文献   

黑龙江省3座城市药用园林植物素材的选择   总被引：3，自引：0，他引：3  

李景华  严俊鑫 《东北林业大学学报》2007,35(5):90-93

从药用园林植物角度,对黑龙江省哈尔滨市、齐齐哈尔市和牡丹江市药用园林植物的组成和利用进行了调查。这3座城市药用园林植物共有69种,隶属于34科52属。其中:常绿乔木4种,落叶乔木26种,灌木19种,木质藤本6种,草本花卉10种,湿生草本4种。对这些药用园林植物种类按入药部位进行归类,其中:果实和种子类共33种,花类9种,叶类13种,枝类12种,干(皮)或茎(皮)类14种,根或根茎类13种,全草类6种。同时,根据现有资料,对适合这3座城市栽培的具有观赏价值的常用野生草本药用植物种类进行了归纳整理,结果有33种可供选择。在此基础上,还探讨了药用园林植物在城市园林绿化中的地位、意义及注意事项。  相似文献   

福建省竹柏资源状况及开发利用前景分析   总被引：6，自引：0，他引：6  

周俊新 《江西林业科技》2008,(5)

我国生物柴油的研究与开发虽起步较晚,但发展速度很快,部分科研成果已达到国际先进水平,研究内容涉及到油脂植物的分布、选择、培育、遗传改良及其加工工艺和设备.竹柏(Podocarpus nagi)是福建省的乡土树种,种子粒大.种实含油率37.22%以上,单位面积种实产量高,作为燃料油树种具有广阔的发展前景.通过对福建省的竹柏资源调查、主要经济性状调查结果分析.根据竹柏的生长、繁殖特点,对竹柏作为能源树种的发展前景、途径进行了初步探讨.  相似文献