莱芜大姜的脱毒及优质高产栽培技术     

赵增建 《中国果菜》2007,(3):14-15

莱芜大姜是我国名优生姜品种，该品种姜块肥大，色泽光亮，肉细丝小，营养丰富，风味浓郁，除鲜食外，还适宜加工成多种调味品及保健食品，在国内外享有盛誉。近几年在山东莱芜及周边地区大面积发展，并取得了较好的经济效益，现将莱芜大姜的脱毒技术及高产栽培技术总结如下。  相似文献   

Multi-scale predictive habitat suitability modeling based on hierarchically delineated patches: an example for yellow-billed cuckoos nesting in riparian forests,California, USA     

Evan H. Girvetz  Steven E. Greco 《Landscape Ecology》2009,24(10):1315-1329

The discipline of landscape ecology recognizes the importance of measuring habitat suitability variables at spatial scales relevant to specific organisms. This paper uses a novel multi-scale hierarchical patch delineation method, PatchMorph, to measure landscape patch characteristics at two distinct spatial scales and statistically relate them to the presence of state-listed endangered yellow-billed cuckoos (Coccyzus americanus occidentalis) nesting in forest patches along the Sacramento River, California, USA. The landscape patch characteristics calculated were: patch thickness, area of cottonwood forest, area of riparian scrub, area of other mixed riparian forest, and total patch area. A third, regional spatial variable, delineating the north and south portions of study area was also analyzed for the effect of regional processes. Using field surveys, the landscape characteristics were related to patch occupancy by yellow-billed cuckoos. The area of cottonwood forest measured at the finest spatial scale of patches was found to be the most important factor determining yellow-billed cuckoo presence in the forest patches, while no patch characteristics at the larger scale of habitat patches were important. The regional spatial variable was important in two of the three analysis techniques. Model validation using an independent data set of surveys (conducted 1987–1990) found 76–82% model accuracy for all the statistical techniques used. Our results show that the spatial scale at which habitat characteristics are measured influences the suitability of forest patches. This multi-scale patch and model selection approach to habitat suitability analysis can readily be generalized for use with other organisms and systems.  相似文献   

潜水电泵电缆引入密封装置的分析与改进设计     

黎瑞  岳大军  刘星焱  陈中友  赵洋 《农业装备与车辆工程》2009,(9):22-24,33

根据实际工作经验,在系统地分析潜水电泵电缆引入密封装置使用寿命短的影响因素基础上,对其作了结构改进.主要采取了在传统密封装置结构上依次增加涨圈、压紧垫圈、次级压紧螺栓、O形橡胶密封圈、紧固件和次级接线盒等措施,共同组成二道面与面接触的密封系统.改进后的潜水电泵不仅在潜水深度上大大超过标称深度达5m以上,而且延长了使用寿命.  相似文献   

酸枣组培苗的生根及移栽研究     

刘彩霞  代丽  刘孟军  赵锦 《勤云标准版测试》2007,(7)

以酸枣组培苗为试材,研究了IBA不同浓度、茎段不同类型及刻伤与否等对生根的影响,并以蛭石、土、珍珠岩、沙子等为基本基质进行了移栽实验。结果表明:采用1/2MS培养基添加IBA1.0～1.5 mg/L,生根效果最好,平均生根率达83.2%～96.3%;带茎尖茎段的生根率显著高于不带茎尖茎段;茎段基部刻伤处理后较对照生根量明显增加;酸枣带根组培苗适宜的移栽基质为1:1的珍珠岩和土;5月份移栽下地的组培苗,其生长呈现慢-快-慢的趋势。  相似文献   

10份菠萝种质资源的描述和评价   总被引：1，自引：0，他引：1  

贺军虎  陈业渊  王芳  刘少芬  曾垂凤  赵小青 《热带作物学报》2009,30(12):1731-1735

对收集的10份菠萝种质资源植株的芽、叶片及其果实性状进行描述和评价.结果表明:徐台品种的可溶性固彤物含量最高,其余指标接近于巴厘品种但无刺,是巴厘品种较好的一个替代品种;上海2号品种果型端正,果肉橙黄色,品质中上,Vc含量高,是较好的鲜食和加工皆宜品种;ST品种风味好,口感好,是一个优良的鲜食品种.  相似文献   

克氏原螯虾温室大棚规模化繁育技术及工艺     

赵朝阳  周鑫  徐增洪  徐跑  戈贤平 《勤云标准版测试》2009,29(5)

阐述了克氏原螯虾温室大棚规模化繁育技术,包括繁育设施的建造、工厂化人工诱导繁殖,规模化网箱育苗技术等,为克氏原螯虾育苗生产提供借鉴.  相似文献   

7种药剂防治大球蚧试验     

王玉兰  唐丽  张新平  鲁德珍  晁岱容  赵立生 《中国林副特产》2009,(3):21-22

通过不同杀虫剂对果树大球蚧越冬若虫的防效试验结果表明,40%蚧蚧高乳油、40%新速扑蚧乳油、25%蚧虱速乳油1500倍液对大球蚧越冬若虫防效较好,药后15d,防效分别是91.86%,90.76%和90.60%。  相似文献   

不同穗型水稻群体中温湿度特征的研究     

周立宏  李秀芬  赵凤艳  王伯伦  刘淑梅 《勤云标准版测试》2009,29(16)

本研究以不同穗型的3个品种沈稻11、辽粳294和沈农9816为试材，研究了水稻群体间的温湿度特征。结果表明，白天不同品种水稻群体中温度和相对湿度的变化趋势与大气一致。水稻群体中露点温度的脉动远大于温度和相对湿度，总的趋势是中午露点温度较高。不同水稻群体中温度的差异小于湿度。从8月上旬至9月中旬，不同品种群体中的温、湿度差异逐渐增大，弯穗品种群体中的温度低于直立、半直立穗品种，湿度大于直立、半直立穗品种，直立和半直立穗品种之间的差别不太大。  相似文献   

基于双目立体视觉的苗期玉米株形测   总被引：4，自引：2，他引：2  

王传宇  赵明  阎建河 《农业机械学报》2009,40(5):145-148

将田间正常生长的待测玉米植株带土移至测定台上,标定双目立体视觉系统,提取、分割叶片图像,以Douglas-Peucker多边形法逼近叶片边缘,去除两幅对应图像中没有匹配关系的多边形顶点,结合投影矩阵计算出叶片边缘点的三维坐标.分别投影叶片边缘点到植株平面和植株水平平面,对投影的离散点分段二次拟合、Cardinal样条插值,得到代表叶片形状的曲线,计算出叶长、叶片着生高度、茎叶夹角、叶片方位角等株形指标.测量实验表明,本方法快速、准确、自动化程度高,能够满足苗期玉米株形测量的要求.  相似文献   

Historical influences dominate the composition of regenerating plant communities in abandoned citrus groves in north-central Florida     

Graeme S. Cumming  Ann George 《Landscape Ecology》2009,24(7):957-970

The question of what determines plant community composition is fundamental to the study of plant community ecology. We examined the relative roles of historical land use, landscape context, and the biophysical environment as determinants of plant community composition in regenerating citrus groves in north-central Florida. Results were interpreted in light of plant functional traits. Herbaceous and woody plants responded differently to broad-scale variables; herbs correlated most strongly with surrounding land cover at a scale of 8 km, while the only significant determinant of woody species distributions was local land use history. There were significant correlations between herbaceous species and spatial context, habitat isolation, environmental variables, and historical variables. Partial Mantel tests indicated that each variable provided a unique contribution in explaining some of the variation in the herbaceous dataset. The correlation between woody plants and local historical variables remained significant even with other effects corrected for. In the herbaceous community, species composition was linked to functional traits much as expected from classical theory. While spatial influences in our study system are important for both woody and herbaceous plants, the primary determinant of plant community composition in regenerating citrus groves is historical land use. Our results suggest that the fine-scale mechanisms of local competition, tolerance and facilitation invoked by many classical studies may ultimately be less important than land use history in understanding current plant community composition in regenerating agricultural areas.  相似文献