摘要：目的：研究双覆盖技术在三七育苗上的应用效果，为三七育苗方法的改进和节水灌溉提供理论依据。方法：采用田间随机区组试验设计，对不同覆盖方式处理的土壤含水率、土温及容重进行取样测定，同时调查记录田间三七出苗率、种苗质量。结果：同传统松毛或稻草单覆盖相比，三七育苗床畦面采用松毛或稻草＋地膜的双覆盖方式，可减少育苗初期浇水量2／3以上，松毛或稻草＋地膜的双覆盖方式三七种子播种到出苗的40d内不用浇水，保持出苗期土壤含水量稳定在30％左右和土温稳定在9—16．5℃，促进畦面土壤疏松，防止田间倒春寒危害，从而显著提早三七出苗期，提高田间出苗率、出苗整齐率和种苗质量。仅采用松毛或稻草的单覆盖方式保水、保温效果较差，需12d左右浇施一遍水，三七田间出苗时间较双覆盖处理晚14d，出苗盛期晚24～26d，出苗率低11．3％～18．7％，且松毛的效果要优于稻草。采用地膜单覆盖虽然有较好保水、保温效果，促进三七出苗和提高发芽率，但存在Et均土温变化较大、田间土壤易板结，畦面青苔、杂草较多，不利于后期田间管理的不足。结论：生产上建议三七种子播种期采用松毛＋地膜双覆盖方式，以节水抗旱、节省劳力，提高种子出苗率和种苗质量，出苗盛期后揭掉地膜采用松毛单覆盖的方式进行苗期管护。

摘要：Nanostructured BN and BN-Co films with Cu,Co,Au as the top electrodes,and Pt as the bottom electrodes were grown by magnetron *** BN samples and BN-Co ones show bipolar resistive switching *** the sample with active Cu as the top electrode,the formation and rupture of metallic Cu conductive filaments can explain the resistive switching behavior;for the other samples,the generation and annihilation of nitrogen vacancies under the electric stimuli may contribute to the occurrence of resistive *** advantage of the formed and broken Co-N bonds during resistive switching,the saturation magnetization of the BN-Co films can be ***,it investigated the resistive switching behavior of BN and BN-Co materials in this *** to that of oxide materials,the resistive switching behaviors of the nitrides may be attributed to the movement of cations or anions within the dielectric or electrodes during the application of ***,ion migration may lead to the formation or breaking of Co-N bonds,which can effectively regulate the magnetism of BN-Co *** study extends resistive switching materials to nitrides,enabling the regulation of magnetism along with resistance changes,thus providing insights for the design of novel voltage-controlled magnetic devices and achieving multi-functionality.

摘要：为了建立快速区分多花黄精及其混淆品的鉴别方法,本研究采用位点特异性PCR方法,通过对多花黄精及其混淆品的psb A-trnH片段进行扩增。同源比对后根据其变异位点设计特异性鉴别引物,分析多花黄精及其混淆品的位点特异性差异情况。结果表明:本研究设计的特异性鉴定引物,在一个PCR反应中多花黄精能扩增出329 bp的条带,而混淆品不能扩增出条带,从而实现了正伪品的鉴别。该方法有效区别多花黄精与其混淆品品种,经多次试验,重复性较好。本研究为快速区分多花黄精及其混淆品提供了有效办法。