饮用水水源地建设迹地生态恢复技术探讨--以甘肃成县磨坝峡水库水源工程为例     

李丹雄  王进辉  张雪  赛硕  杨之恒  王辛羽 《中国水土保持》2020,(1):21-25

建设水源地是解决水资源短缺的有效途径,保护水源地、恢复水源地迹地植被是保障水源水质的重要举措。在分析水源地迹地生态恢复研究现状及常用技术措施的基础上,以甘肃成县磨坝峡水库水源工程为典型案例,探讨了围栏、标志牌、拦污索、边坡植被恢复及放流增殖这5类适用于地表水水源地建设迹地的生态恢复技术措施及其应用效果,以期为今后类似工程提供技术参考。  相似文献   

盐碱胁迫对红车轴草种子萌发的影响     

杨雪君  毛金枫  张雪  裴毅  刘芳  聂江力 《北方园艺》2016,(9):69-74

以红车轴草种子为试材,利用不同浓度的NaCl溶液、NaHCO_3溶液、NaCl和NaHCO_3(1∶1)混合溶液在培养皿中模拟3种盐碱环境,观察红车轴草种子的萌发状况,以期明确红车轴草的耐盐碱能力。结果表明:红车轴草种子发芽率、发芽势、相对发芽率、发芽指数、活力指数、苗鲜重和胚根长等指标,表现出随NaCl、NaHCO_3、NaCl和NaHCO_3混合溶液(1∶1)浓度的增加,总体呈下降趋势。苗鲜重和胚根长,呈现显著的负相关关系,相对盐害率与溶液浓度呈现正相关关系。NaCl胁迫下红车轴草种子萌发的耐盐浓度8.091‰,半数抑制浓度10.146‰,极限浓度12.200‰;NaHCO_3胁迫下红车轴草萌发的耐盐浓度5.483‰,半数抑制浓度7.434‰,极限浓度9.386‰;NaCl与NaHCO_3(1∶1)混合溶液胁迫下红车轴草萌发的耐盐浓度6.081‰,半数抑制浓度7.253‰,极限浓度8.425‰。蒸馏水复萌试验表明,经3种盐碱胁迫后红车轴草种子均有不同程度的复萌。综上所述,红车轴草种子具有一定的抗耐盐碱能力。  相似文献   

猪流行性腹泻病毒 TaqMan 荧光定量 PCR 方法的建立与应用简     

李 彬 刘浩飞 孙 冰茅爱华  杜露平何孔旺郭容利  温立斌张雪寒倪艳秀  周俊明吕立新俞正玉  王小敏胡屹屹  祝昊丹于 洋 《江苏农业学报》2014,(1):125-129

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基于供给—消耗关系的青海省高寒草地承载力时空变化分析     

高婕  赵新全  刘文亭  杨晓霞  张春平  俞旸  曹铨  刘玉祯  张雪  董全民 《草业学报》2023,(5):1-12

青海省是青藏高原的重要组成部分，因此，探究当地的草畜平衡状况，揭示其草地生态系统承载能力的时空变化趋势，对实现草地资源的可持续利用具有重要意义。本研究以青海省放牧家畜养殖为切入点，结合遥感影像数据与青海省畜牧业统计数据，对青海省草地生态系统的承载状态进行分析。结果显示：1)2005-2020年青海省放牧家畜数量共增长了25.35%；从家畜结构来看，玉树藏族自治州与果洛藏族自治州以牦牛饲养为主，海北藏族自治州、海南藏族自治州及海东市以绵羊饲养为主。2）青海省草地资源消耗量在这16年间增加了13.21%，总体表现为上升趋势，且各地级行政区间有所差异。3）青海省严重超载的地级行政区数量在2010年首次降至3个以下，整体草畜平衡状况于2013年表现最佳，草地承载压力总体有减缓趋势；分地区而言，压力增幅最明显的为海南藏族自治州，降幅最明显的为果洛藏族自治州。结果表明，2005-2020年青海省放牧家畜数量有所增加，但载畜压力有缓解趋势，省内各地级行政区在牲畜结构和压力变化方面都表现出了一定的差异性，明确了因地制宜的重要性。该结果可为青海省高寒草地生态管理及畜牧产业发展等方面提供科学依据。  相似文献   

融水县“成林杉树套种灵芝”效益显著     

韦淑花  张雪芬  潘庆松  欧阳忠 《吉林农业》2012,(7):125

灵芝作为药食兼用的药材需求广泛,融水县有悠久的灵芝种植历史,经验丰富,本文针对成林杉树套种灵芝做出一定阐述,为灵芝的种植提供借鉴.  相似文献   

大学生就业的心理指导与职业规划     

张雪  马淑芹 《北京农学院学报》2008,(Z1)

笔者根据近年来大学生就业所面临的困难,在心理调适与今后的职业规划等方面做出指导,希望大学生能正确面对就业问题,早日找到令人满意的工作,并在工作岗位上实现自己的社会与个人价值。  相似文献   

新常态下如何发展现代农业——访农业部部长韩长赋     

张雪 《农村．农业．农民》2015,(1)

<正>随着我国经济进入新常态、改革进入深水区、经济社会发展进入新阶段,农业发展的内外环境正在发生深刻变化,加快建设现代农业的要求更为迫切。推进现代农业发展,当前最紧迫的任务是什么?我们该如何发展现代农业?笔者就这些问题专访了农业部部长韩长赋。韩长赋表示,当前,农业部门适应新常态、推进现代农业发展,最紧迫的任务就是要大力推进农业发展方式转变和结构调整。他指出,近年来我国农业现代化加快推进,但各种风险和结构性矛盾也在积累聚集,突出表现在:农业资  相似文献   

羊脂制取肥皂的工艺研究     

张雪  魏建春 《郑州牧业工程高等专科学校学报》2007,27(2):14-15

对从羊脂中制取肥皂的工艺条件进行了研究,经过净化、皂化、盐析等工艺制取出具有广阔市场前景和经济效益的化工产品肥皂。  相似文献   

Response of grain yield and related agronomic traits of oilseed flax to diversified cropping rotations北大核心CSCD     

王海娣  张勇  高玉红  吴兵  剡斌  崔政军  王一帆  张雪 《草业学报》2022,31(12):52-65

This research aimed to identify a suitable planting pattern for oilseed flax production in a dry-farming region. A long-term field experiment was started in 2012 with a 4-year crop rotation cycle,designed to measure the effects on flax crop performance of previous crop,and various patterns of flax planting interval within the four-year rotation,compared with continuous flax cropping. Crop parameters measured included plant height,stem diameter,dry matter accumulation and distribution,and the experiment included six different crop rotation patterns：Flax→flax →flax→flax［（F）FFF］;Flax→wheat→potato→flax［（F）WPF］;Flax→potato→flax→wheat［（F）PFW］;Flax→ flax→wheat→potato［（F）FWP］;Flax→wheat→flax→potato［（F）WFP］and flax→wheat→potato→wheat［（F）WPW］. Results for the ninth year showed significantly increased grain yield（29. 89%-109. 57%）in crop rotation treatments compared with continuous cropping of oilseed flax. The ranking of the six tested rotations for yield was：（F）WPW>（F）FWP>（F）WFP>（F）PFW>（F）WPF>（F）FFF. The grain yield of oilseed flax was significantly affected by previous crop,frequency and years interval of flax cropping and number of years of continuous flax cropping. Yield was increased by 54. 45%-59. 29% under wheat stubble and potato stubble compared with oilseed flax stubble,and increased by 30. 66% and 109. 57%,respectively,under 50% and 25% frequencies,compared with 100% frequency. The grain yield of oilseed flax under two-year continuous cropping was higher by 29. 89% than four-year continuous cropping,and increased with increase in years interval between flax crops. Correlation analysis identified a significantly positive correlation between oilseed flax grain yield and effective capsule number,branch number and 1000-seed weight. The effective capsule number,branch number and 1000-seed weight of oilseed flax under rotation treatment were increased by 35. 88%-108. 91%,15. 47%-46. 19% and 14. 61%-16. 34%,respectively（P<0. 05）,compared with continuous cropping. In addition,the high grain yield of oilseed flax was accompanied by an increase in plant height,stem diameter and dry matter accumulation and these increases were,respectively,5. 11%-42. 24%,2. 77%-39. 92% and 31. 25%-117. 89% under the rotation regimes,compared with continuous cropping. Reduction in the number of years of continuous cropping years,change of crop stubble,decreased flax planting frequency and increased of interval between flax crops also improved flax crop performance. In summary,crop rotation improved the vigor of oilseed flax,resulting in greater plant height and stem diameter,improved dry matter accumulation and distribution,leading to increased branch number,effective capsule number and 1000-seed weight,and increase in the crop yield of oilseed flax. The results indicated that a multiple-crop rotation pattern was an effective way to avoid the yield reduction caused by continuous cropping in oilseed flax. The rotation： Flax→wheat→potato→wheat performed best among those tested and can be recommended as an appropriate cropping rotation for oilseed flax production in the dry region of northwest China. © 2022 Editorial Office of Acta Prataculturae Sinica. All rights reserved.  相似文献   

万寿菊提取物对太行鸡抗氧化能力及肠道形态的影响     

李朋帅  乔梦泽  张雪  郭相丽  朱亚昊  周泽  陈祥宇  刘新芳  陈辉  陈一凡 《中国畜牧杂志》2022,(6):240-244

本试验旨在探讨万寿菊提取物对太行鸡抗氧化能力和肠道形态的影响。选用健康状况良好且体重相近的56周龄太行鸡288只,随机分为4组,每组4个重复,每个重复18只鸡。对照组饲喂基础日粮,试验I、II、III组在基础日粮中分别添加100、200、300 mg/kg万寿菊提取物。预饲期7 d,正试期28 d。结果表明：与对照组相比,200、300 mg/kg万寿菊提取物组太行鸡的血清丙二醛含量显著降低,谷胱甘肽过氧化物酶、超氧化物歧化酶和总抗氧化能力显著升高;对于肠道形态,与对照组相比,100、200 mg/kg万寿菊提取物组太行鸡的空肠绒毛高度（VH）和绒毛高度/隐窝深度（V/C）显著降低,200 mg/kg万寿菊提取物组的空肠隐窝深度（CD）显著升高,试验组的十二指肠VH和V/C显著降低;100、200 mg/kg万寿菊提取物组太行鸡的十二指肠CD显著升高。综上所述,日粮中添加200 mg/kg或300 mg/kg万寿菊提取物可提高太行鸡的抗氧化能力,100 mg/kg或200 mg/kg万寿菊提取物组空肠和十二指肠的VH和V/C值显著降低,CD显著升高;在本试验条件下,太行鸡日粮中推荐万寿...  相似文献