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紫苏新品系陇苏2012-8-1是甘肃省农业科学院生物技术研究所在对紫苏种质鉴定及品种优选的基础上,利用多代集团混合选择技术,经过连续5 a选育而成。2016 — 2017年参加甘肃省多点区域试验,2 a 10点(次)平均折合产量为3 117.15 kg/hm2,较对照品种陇苏1号增产18.57%。该品系生育期158 d,平均株高168.1 cm,籽粒灰褐色,千粒重3.59 g,单株产量74.81 g。田间表现丰产性、稳产性好,抗病性强。籽粒α-亚麻酸含量58.35%,含油44.66%,饱和脂肪酸含量19.45%,不饱和脂肪酸含量78.56%,品质优良。适宜在甘肃省庆阳、平凉、天水等半干旱山区及其同类地区种植。 相似文献
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土壤—景观定量模型研究进展 总被引:5,自引:2,他引:5
传统土壤调查和制图建立在调查者经验思维基础上,目前对高精度土壤信息的大量需求对传统技巧性土壤调查方式提出了挑战,量化的土壤———景观模型日益受到土壤科学家的重视。近十年内世界各国开展了大量研究,试图将数字地形分析,GIS技术和土壤调查技术相结合,通过对景观信息的分析预测土壤信息。本文简要阐述土壤景观模型的基本原理和定义,对线性回归、回归树、判别分析、模糊聚类、地统计学、模糊推理和规则网络等模型的研究进展进行总结。在此基础上讨论了模型的发展方向和应用前景。 相似文献
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土壤氮矿化-固持周转(MIT)研究进展 总被引:4,自引:0,他引:4
土壤氮矿化-固持周转(MIT)过程与土壤供氮力及氮素损失间存在密切关系。本文概述了近年来MIT过程的研究方法及其相应的模型;对土壤温度、土壤水分、土壤理化性质、植物生长状况以及有机、无机肥的施用等影响MIT过程的主要因素进行了较详尽地阐述,并展望了今后主要的研究方向。 相似文献
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H9020-20-12-1-8是一个通过杂交和回交选育的普通小麦(Triticum aestivum L.)华山新麦草(Psathyrostachys huashanica Keng.)易位系,苗期对中国小麦生产上流行的条锈菌(Puccinia striiforms f.sp.tritici)生理小种CYR32表现良好抗性。遗传分析表明,H9020-20-12-1-8对CYR32的抗病性是由1对显性基因YrHy(暂命名)独立控制的,通过对H9020-20-12-1-8和感病品种铭贤169杂交F2分离群体进行SSR分子标记,从305对SSR引物组合中筛选到3个与抗病基因YrHy紧密连锁的微卫星标记Xgwm429、Xwgm770和Xwmc154,与YrHy的遗传距离分别为5.4、6.4和11.3cM,将YrHy定位于小麦2BS染色体上。系谱分析及分子检测等结果表明,YrHy是一个源于华山新麦草的新抗条锈病基因。 相似文献
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草-牧-沼-果循环模式与长汀水土保持实践 总被引:3,自引:2,他引:3
福建省长汀县水土保持事业局 《亚热带水土保持》2007,19(1):27-30
以种草为基础,沼气为纽带,果业、畜牧业为主体,设计出草-牧-沼-果为核心的生态农业模式。寻找生态效益与经济效益的结合点,探讨了侵蚀地生态重建的思路与实施方案,最后对示范区建设的生态、社会和经济效益进行了分析。 相似文献
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Metabolic fate of (-)-[4-(3)H]epigallocatechin gallate in rats after oral administration 总被引:2,自引:0,他引:2
Kohri T Matsumoto N Yamakawa M Suzuki M Nanjo F Hara Y Oku N 《Journal of agricultural and food chemistry》2001,49(8):4102-4112
After oral administration of [4-(3)H]EGCg to rats, the radioactivity in blood, major tissues, urine, and feces was measured over time. The radioactivity in blood and most tissues remained low for 4 h postdose, began to increase after 8 h, peaked at 24 h, and then decreased. Major urinary excretion of radioactivity occurred in the 8-24 h period, and the cumulative radioactivity excreted by 72 h was 32.1% of the dose. The radioactivity in the feces was 35.2% of the dose within 72 h postdose. In the case of rats pretreated with antibiotics (antibiotic-pretreated rats), the radioactivity levels of the blood and urine were definitely lower than those in rats not pretreated with antibiotics (normal rats). The radioactivity recovered in the antibiotic-pretreated rat urine was estimated to be only (1)/(100) of that in the normal rat urine. These results clearly demonstrated that the radioactivity detected in the blood and urine of normal rats mostly originated from degradation products of EGCg produced by intestinal bacteria. Furthermore, a main metabolite in the normal rats was purified and identified as 5-(5'-hydroxyphenyl)-gamma-valerolactone 3'-O-beta-glucuronide (M-2). In feces of the normal rats, EGC (40.8% of the fecal radioactivity) and 5-(3',5'-dihydroxyphenyl)-gamma-valerolactone (M-1, 16.8%) were detected. These results suggested that M-1 was absorbed in the body after degradation of EGCg by intestinal bacteria, yielding M-1 with EGC as an intermediate. Furthermore, M-2 was thought to be formed from M-1 in the intestinal mucosa and/or liver, then to enter the systemic circulation, and finally to be excreted in the urine. Taking into account all of the above findings, a possible metabolic route of EGCg orally administered to rats is proposed. 相似文献