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同德短芒披碱草的驯化选育 总被引:1,自引:0,他引:1
本文介绍了同德短芒披碱草的栽培驯化情况及其特征特性和栽培技术,该品种抗旱、耐寒、耐盐碱,品质优良,各类牲畜均喜食,生育期110—120d,成熟整齐,落粒性小,籽粒饱满,千粒重达3.8—4.6g,平均株高115.6cm,产青干草5708.8~7825.4kg/hm^2,产籽629.7~841.3kg/hm^2,适宜在海拔高度4200m以下的地区推广种植。是青海省高寒牧区进行草地建设、退耕还林(草)和生态治理工程中最适宜的优良牧草品种之一。 相似文献
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高寒地区优良牧草——青海中华羊茅 总被引:3,自引:1,他引:2
青海中华羊茅,抗旱、耐寒、耐盐碱,品质优良,各类牲畜均喜食,生育期106-109d,种子成熟整齐,落粒性小,籽粒饱满,千粒重0.5~0.8g,平均株高88.0cm,产青干草3910.7—4687.9kg/hm^2,产种子355.0—472.4kg/hm^2。适宜在海拔高度4200m以下的地区种植。是高寒牧区进行草地建设、退耕还林(草)和生态治理工程中最适宜的优良牧草品种之一。 相似文献
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内生真菌与植物所形成的共生体普遍存在于冷季禾草中,共生体有利于提高宿主植物的生物和非生物抗性。虽然目前研究者们已对禾草内生真菌做了大量的研究,但是尚未发现对分布于中国西北地区披碱草属植物无性世代Neotyphodium内生真菌培养特征的研究。本研究从中国西北地区分离出15株来自不同地理种群披碱草属植物无性世代Neotyphodium内生真菌。通过分离培养,测定了这15株无性世代Neotyphodium内生真菌的菌落生长速度,结果显示,这15株无性世代Neotyphodium内生真菌菌落的平均生长速度为(0.41~0.85) mm/d,且生长速度与海拔具有相关性。分布在海拔低于3000 m的无性世代Neotyphodium内生真菌的菌落生长速度比生长于海拔高于3000 m菌落的生长速度快。观察菌落发现,分布在海拔高于3000 m的菌落正面特征较为一致,而分布在海拔低于3000 m的菌落正面特征出现不同。另外,通过多基因联合建树发现,分布在海拔高于3000 m的无性世代Neotyphodium内生真菌聚在一个分支,而分布在海拔低于3000 m的无性世代Neotyphodium内生真菌呈现星状分布。由于目前尚未对中国西北地区披碱草属植物无性世代Neotyphodium内生真菌命名。因此,希望本研究结果能为该菌的命名提供理论依据。 相似文献
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“天鹅”燕麦草是一种草质优良、营养丰富的中熟高产优质燕麦品种。2003年从澳大利亚引进在贵南县森多乡试种了133hm^2,试验结果表明,该品种在贵南地区长势良好,平均每公顷产鲜草23092.5kg,平均株高83cm,种子可完全成熟,在平均海拔3500m的贵南地区可进行大面积的推广种植。 相似文献
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在青海省果洛州引种 2 4种牧草 ,2年试验观测表明 :8种牧草的越冬率和第二年的生物产量均表现好 ,可以在青海省南部地区推广种植。 相似文献
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The effect of temperature on growth and survival of Fusobacterium necrophorum isolated from bovine liver abscesses. 下载免费PDF全文
P C Simon 《Canadian journal of veterinary research》1977,41(2):169-173
The ability of Fusobacterium necrophorum to survive or grow in liquid nitrogen or at temperatures between -10 degrees and 59 degrees C was determined. The organism remained viable but did not grow in liquid nitrogen or between -10 degrees and 21 degrees C. It grew between 22 degrees and 43 degrees C. No isolate grew at temperatures above 43 degrees C and all three isolates survived for a minimum of 15 minutes and an average of 25 minutes at 59 degrees C. The optimum temperature for maximum growth was 37 degrees C. The organism survived in ampoules stored in liquid nitrogen for eight years. It survived in liver abscesses stored at -10 degrees C for five years and as cultures in screw capped tubes for three years. 相似文献
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Chronic natural hypoxia at 2300 m altitude induces mild pulmonary hypertension (PH) in healthy dogs. The influence of more severe hypoxia on the same group of dogs was evaluated by re-examining such dogs at 3500 m, after they had regularly exercised at this altitude level for half a year. Despite severe hypoxaemia at 3500 m (P
aO2 52±5 mmHg), none of the dogs developed erythrocytosis, and their PCV at 3500 m (48%±4%) did not differ from that at 2300 m (49%±4%). There was a tendency towards an elevated systemic BP, with a significant increase in diastolic BP (105±13 mmHg at 3500 m versus 98±17 at 2300 m). Tricuspid regurgitation (TR) was detected in 7 dogs at 3500 m compared to 8 dogs at 2300 m. The mean TR V
max was significantly higher at 3500 m, and all 7 dogs had systolic PH at 3500 m (33.6–54.8 mmHg), when PH was defined as TR V
max 2.8 m/s, i.e. a peak pressure gradient >30 mmHg. Hence, in dogs, increasing altitude and the concomitant hypoxia result in a progressively more pronounced PH and an elevated systemic BP. Intermittent severe hypoxaemia of around 50 mmHg may not cause erythrocytosis in healthy dogs, even over a prolonged period. 相似文献
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[目的]品种和海拔是影响燕麦草产量和品质的重要因素,高产品种可以提高干草产量20%以上,而且茎叶比也不同,产量越高,叶量越丰富,其干草产量和品质均高。所以,不断进行品种比较试验,引进新品种,对燕麦草生产的效益影响重大。[方法]试验研究了不同品种的燕麦在不同海拔地区的产量及品质的差异。[结果]经研究,青海444在甘南州不同海拔地区表现出良好的适应性,林纳和加燕2号在低海拔区产量较高,但在高海拔地区的产量不及本地燕麦。从茎叶比和营养物质含量分析,林纳和加燕2号的茎叶比较高,ADF和NDF的含量较低,因此,其品质好于青海444和本地燕麦。[结论]综合考虑燕麦草产量与品质2个因素,在甘南州低海拔地区适合推广林纳和加燕2号,高海拔地区适合种植本地燕麦和青海444。 相似文献