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珠海市园林绿化草坪冬季盖播草种的引种试验 总被引：1，自引：1，他引：0
试验对11个多年生黑麦草Lolium perenne品种和11个高羊茅Festuca elata品种在珠海地区用于草坪冬季盖播的相关坪用性状包括苗期坪用性状(出苗率、苗期生长速度、苗期密度、成坪和显绿时间)和成坪后的坪用性状(密度、质地、颜色、均匀性、生长速度、青绿期、地下生物量、耐践踏性以及综合喜好)等指标进行了测定,并运用模糊综合评判法对各草种作为园林草坪冬季盖播草种的相关坪用性状进行综合评判,结果表明:所有多年生黑麦草品种的冬季坪用性状都要优于高羊茅品种,其中以多年生黑麦草品种爱神特、潘多、凯蒂莎、玛格丽特、佳丽2号、夜影等具有成坪速度快、综合坪用性状优良等特点,可用于珠海乃至同类气候地区园林绿化草坪的冬季盖播草种. 相似文献
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三种草坪草耐低刈性研究 总被引：2，自引：0，他引：2
本文用草地早熟禾、紫羊茅和高羊茅三种寒地型草坪草作研究材料。以三种不同修剪高度处理（即留茬2cm、4cm和6cm)，在连续控高修剪试验中，通过测定其草坪功能质量，对它们的耐低刈性进行了分析研究。结果表明：三种草坪草的最低适宜修剪高度分别为草地早熟禾2cm、紫羊茅4cm、高羊茅6cm。 相似文献
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西宁地区草坪草引种品比试验研究 总被引：2，自引：0，他引：2
通过对西宁地区5个种16个品种草坪草的引种品比试验,对其环境适应性(青绿期,抗病性,越冬、越夏)和坪用性状指标(密度、颜色、质地、耐践踏性和幼苗生长速度)进行测定,对环境适应性、绿地型、运动型坪用性状进行综合评定.结果表明:草地早熟禾Poa pratensis的午夜和抢手股,加拿大早熟禾P.compressa的印第安酋长,多年生黑麦草Lolium perenne的阳光具较好的环境适应性和较高的坪用性状,既适宜绿地型草坪建植,又适宜运动型草坪建植;高羊茅Festuca elata的2个品种适宜运动型草坪建植;紫羊茅F.rubra派尼是绿地型草坪建植的理想品种;多年生黑麦草的美洲豹较适宜绿地型草坪建植. 相似文献
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30个引种草坪草在北京地区的成坪质量评价与适应性研究 总被引：3，自引：1，他引：3
对30个引种草坪草在北京地区进行了出苗速度观测及成坪质量综合评价.结果表明,高羊茅Festuca arundinacea和多年生黑麦草Lolium perenne的前期出苗速度均显著高于紫羊茅F.rubra和早熟禾Poa pratensis,而紫羊茅和草地早熟禾出苗后的变化较稳定.成坪质量评比结果显示,草地早熟禾中的Midnight,Kentucky,Conni;多年生黑麦草中的Goalkeeper,Accent,Fairway;高羊茅的Jaguar 3,Fire Phoenix,Houndog 5,Ruby,Starfire,Bingo;紫羊茅中的Pernille,Maxima成坪表现优异. 相似文献
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入冬后，对未成坪，有裸地的紫羊茅与羊茅混播草坪和已成坪无裸地的加拿大早熟禾草坪进行修剪处理，留茬５ｃｍ，次年返青一个月后测定结果是：紫羊茅＋羊茅草坪上，处理的草坪草盖度显著低于对照（未修剪）（Ｐ〈０．０１），处理草坪上的杂草盖度显著大于对照，（Ｐ〈０．０１），草坪草密度减小（Ｐ〈０．０５）；而加拿大早熟禾草坪处理与对照的草坪盖度和杂草盖度均无显著差异，草坪密度增加（Ｐ〈０．０１）。说明在贵阳地区气 相似文献
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魏静 《四川畜牧兽医学院学报》2009,(4):28-32
在现代法律秩序中,商会自治规范是制定法的基础和必要的补充,甚至在某些方面替代了制定法;商会自治规范主要包括商会组织规范、行为规范、惩罚规范以及争端解决规范等;其效力仅及于其内部成员;商会自治规范和制定法之间存在冲突,但也存在整合的基础。 相似文献
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本文概述了猪的毛色类型、猪的毛色遗传模式,着重综述了猪毛色基因分子基础的研究进展,指出存在问题并就未来发展方向做了思考。 相似文献
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以国际标准强毒Ｒ株人工感染非免疫产蛋鸡,定时扑杀,分别从鼻窦、眶下孔、气管、肺、气囊、卵巢和输卵管分离ＭＧ,并收集感染鸡所产蛋分离ＭＧ。结果表明,人工感染４８小时后上、下呼吸道及肺已被全面感染,９６小时气囊已被感染,１２０小时输卵管已能分离到ＭＧ,卵巢始终分离不到ＭＧ。人工感染鸡自１４４小时便能在其所产蛋中分离出ＭＧ。药物治疗能在７２小时内消除感染,油乳剂苗则需２４天后逐渐降低蛋内ＭＧ分离率,药物卵内注射、种蛋药浴、高温处理均能杀死卵内ＭＧ,但以研制的种蛋浸泡剂药浴效果为最好。 相似文献
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REASONS FOR PERFORMING STUDY: Centesis of the bicipital bursa using an 8.9 cm long spinal needle has been reported but the alternative of employing a 3.8 cm long hypodermic needle requires validation. OBJECTIVE: To compare the efficacy of 2 different methods of centesis of the bicipital bursa and to evaluate the usefulness of ultrasonographic imaging to determine the location of solution administered when centesis of the bursa is attempted. METHODS: For Trial 1, 6 clinicians, who had no previous experience of centesis of the bicipital bursa, attempted to inject a solution composed of an aqueous radiopaque contrast medium and physiological saline solution (PSS) into the bicipital bursae of 2/12 horses using the previously described distal approach to inject one bursa and a proximal approach to inject the contralateral bursa. The bicipital tendon and bursa were examined ultrasonographically before and after injection; and both shoulders were examined radiographically to identify the location of the medium. In Trial 2, another 6 clinicians, also with no previous experience of centesis, repeated Trial 1, using 6 horses, but the radiopaque contrast medium was mixed with air instead of PSS. RESULTS: Accuracy of centesis using the proximal approach was 39% and that of the distal approach 28%. Ultrasonographic examination of the shoulder allowed the location of solution and air to be accurately predicted in all 12 shoulders examined. CONCLUSIONS: Clinicians who have had no previous experience performing centesis of the bicipital bursa are unlikely to be successful in centesis using either approach. Radiographic examination after injecting a radiopaque contrast medium may be necessary to assess the success of centesis especially if bursal fluid is not obtained during centesis. Injecting air along with the radiopaque contrast medium provides more accurate ultrasonographic confirmation of centesis and better radiographic definition than does injection without air. 相似文献
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Effects of size of ingestively masticated fragments of plant tissues on kinetics of digestion of NDF
Ingestively masticated fragments were collected and sized via sieving. Different sizes of esophageal masticate and ruminal digesta fragments, and ground fragments of larger masticated pieces were incubated in vitro, and undigested NDF remaining at intervals of up to 168 h of incubation was determined. The ruminal age-dependent time delay (tau) for onset of digestion of NDF was positively correlated (P < 0.004) with the mean sieve aperture estimated to retain 50% of the fragments between successive sieve apertures (MRA). Degradation rate of potentially degradable NDF (PDF) and level of indigestible NDF were not related (P > 0.10) to MRA of masticated and ground fragments. Estimates of tau were positively related to MRA, with slopes of bermudagrass < corn silage < ruminal fragments of corn silage. It was concluded that fragment size-, and consequently, ruminal age-dependent onset of PDF degradation of a mixture of different fragment sizes results in an age-dependent rate of degradation of the more rapidly degrading of two subentities of PDF. Models are proposed that assume a tau before onset of simultaneous degradation of PDF from two pools characterized as having gamma-modeled age-dependency and age-constant rates. The ruminal age-dependent pool seems to be associated with the faster-degrading pool, and its rate parameter increases with range in MRA in the population of fragments. Conceptually, the ruminal age-dependent rate parameter for PDF degradation seems to represent a composite of several effects: 1) effects of the size-dependent tau; 2) range in MRA of the population of ingestively masticated fragments; and 3) subentities of PDF that degrade via more rapid age-dependent rates compared with subentities of PDF that degrade via age-constant rates. The estimated fractional rates of ruminative comminution of ingestively masticated fragments (0.060 to 0.075/h) were of a magnitude similar to the mean fractional rates of PDF digestion (0.030 to 0.085/h), which implies that ruminative comminution may be first-limiting to fractional rate of PDF digestion. The in vivo roles of ingestive and ruminative mastication of fragments on PDF degradation must be considered in any kinetic system for estimating PDF digestion in the rumen. These results and others in the literature suggest that the rate of surface area exposure rather than intrinsic chemical attributes of PDF may be first-limiting to degradation rate of PDF in vivo. 相似文献