SO2对玉米幼苗POD、Pro和MDA的影响

本文采用室内水培及密闭箱静态熏气方法,研究了4个不同浓度（0mg/m3,10mg/m3,30mg/m3和90mg/m3）SO2对晋单51和农大108两个品种玉米幼苗过氧化物酶（POD）、脯氨酸（Pro）和丙二醛（MDA）的影响。研究结果表明,随着SO2浓度的升高,两种玉米幼苗的POD活性呈下降的趋势,且当SO2浓度为10mg/m3、30mg/m3和90mg/m3时POD活性分别降至对照的22.6%、18.9%和12.1%;而结果发现Pro含量随SO2浓度升高逐渐升高,且当SO2浓度与POD处理相同时脯氨酸含量分别上升至对照的195.0%、235.4%和496.5%,SO2浓度为90mg/m3时Pro含量最高,且不同浓度处理时农大108Pro含量均比晋单51高;然而,MDA含量随SO2浓度的升高呈先降低后逐渐升高的趋势,在90mg/m3处升至最高值为对照的310.6%,仍然是农大108MDA含量比晋单51高。因此研究显示低浓度SO2能使玉米幼苗适应胁迫,但高浓度SO2暴露会影响植物生长发育。     

Growth and Physiological Characteristics of Rice Seedlings Raised with Long Mat by Hydroponics: —Comparison with young seedlings raised in soil—

Summary

Growth and physiological characteristics of rice seedlings raised with long mat by hydroponics (SLH) were compared with those of young seedlings raised in soil (YSS). When SLH and YSS were raised under the similar environmental conditions, the dry weight of shoot in SLH was significantly lighter than that in YSS at the time of seedling harvest, whereas the shoot in SLH was as long as that in YSS. The increase of dry weight of shoot and the decrease of dry weight of grain were smaller in SLH than in YSS during the raising of seedlings. In addition, the content of soluble sugars in the grain of SLH was apparently lower than that of YSS, indicating that the supply of carbohydrates from endosperm to shoot was less in SLH than in YSS. Crop growth rate and mean leaf area index of SLH were lower than those of YSS, while net assimilation rate of SLH was similar to that of YSS. The size of leaf blades in SLH was markedly smaller than that in YSS, whereas no significant difference was observed in the rates of photosynthesis and dark respiration in leaf blades between SLH and YSS. The results suggest that the leaf growth of SLH is reduced by the insufficient supply of carbohydrates from endosperm, and this is the major cause of lower levels of dry matter production in SLH as compared with that in YSS.     

鳞尾木育苗及栽培技术研究

于2001年在双柏县进行了鳞尾木种子不同处理方法的育苗试验．2004年进行了苗木栽培试验．结果为：层积催芽及适当的药剂处理是育苗成功的关键；造林地宜选择沙土加砂石砾土为好．     

Outdoor winter storage of container stock on raised pallets—effects on root zone temperatures and seedling growth

Containerized seedlings of Norway spruce (Picea abies (L.) Karst.) and Scots pine (Pinus sylvestris L.) were overwintered on the ground and above ground on pallets. Soil temperatures in elevated containers were lower and showed greater fluctuation than containers on the ground. The lowest temperatures (‐15 to ‐16°C) were observed in containers stored on pallets with little or no snow cover during the winter. Temperatures in the edge rows of containers were lower than interior bed soil temperatures. Lower temperatures were also observed in the top than in the bottom of the container. The storage on pallets resulted in reduced shoot and root growth. Although insulation preventing air movements beneath the container units improved soil temperature conditions and subsequent seedling growth, the best result was obtained when seedlings were stored directly on the ground surface.     

水稻机插秧的育苗播种量研究

为提高水稻机插秧的质量,对水稻培育壮秧的影响因素进行分析,并以盘锦地区常用的水稻手扶式插秧机为例,对育苗播种量进行计算,结合实践经验,总结适宜盘锦地区水稻育苗的播种量以及播种作业原则。     

牛膝细胞转化苗的田间培植

经过近1年的实验室工作,于1997年5月得到发育良好的牛膝细胞转化苗.1997年6月将室内培植14日的6棵幼苗移栽至田间.种植1O日后去弱保留3棵.1997年1O月收获种子.一部分留样,一部分于1998年5月进行田间播种,扩大种植.     

水稻苗床增温剂及分蘖促进剂示范试验报告

通过对水稻施用苗床增温剂及分蘖促进剂试验示范研究,结果表明,增温剂及分蘖促进剂处理增加了水稻苗期的充实度,保证了壮苗,提高了后期的分蘖数与结实率。从产量结果上看,增温剂及分蘖促进剂处理较对照增产33.9 kg/667 m2,增产率为5.5%。     

不同营养基质对红松容器育苗的影响

采用草炭土、腐殖土、马粪、有机肥、锯末、河沙等作为营养土的基本原料,进行了红松容器育苗试验,试验结果表明,草炭土+腐殖土、腐殖土+马粪(鲜)、草炭土+马粪(鲜)是适合红松生长的3种最佳基质配方,同时还观察了不同播种时间对红松容器苗生长的影响。     

壮禾增浸种培育壮秧机理研究

为探讨壮禾增浸种培育壮秧的生理机制，本文比较了用壮禾增浸种和用清水浸种对水稻种子生理特性、萌发和成苗等方面的差异以及这些差异在秧苗素质上的反映，分析了浸种时间对种子活力的影响。结果表明，用壮禾增浸种适宜时间可提高种子活力指数（ＳＶＩ）６．１％～１６．３％，田间播种成苗率提高５．３％，种子脱氢酶活性和淀粉活性显著增强，分别提高１２．４％和１３．２％，呼吸强度增加９．９％，种子生根出芽所需营养底物的供给得以加强，而且种子生活力的提高有助于秧苗的生长，秧苗根系发达，且抑制顶端优势，促进横向生长，分蘖发生早而快，叶片叶绿素含量高，光合物质积累多，秧苗综合素质提高。     

氮磷钾肥和种植密度对长白金面瓜产量的影响

本试验采用地次饱和Ｄ－最优设计，通过田间试验测定参数，建立了长白金面瓜的高产优化数学模型，同时解析了各因素对产时的影响效应，提出优化农艺实施方案。