森林可持续经营的社会福利效应分析

森林具有较强的正外部性,森林的可持续经营对保持和维护森林的外部性具有很强的作用.分析了森林可持续经营的意义及世界主要国家关于森林可持续经营方面的立法,研究人工林和天然林在自给自足和自由贸易情况下实施可持续经营的社会福利效应,并对我国森林实施可持续经营进行了展望.     

河西绿洲节水高效种植模式水资源效率研究

针对石羊河流域水资源缺乏、种植业生产受限的问题,比较了武威市凉州区19种种植模式的水资源利用效率。结果表明,马铃薯和油葵较春小麦(CK1)节水25%且分别增收84.21%和31.58%;低耗水型模式玉米/豌豆和油葵/豌豆的水分利用效率较传统模式春小麦/春玉米(CK2)提高38.2%和52.9%,水分经济利用效率提高51.6%和125%,水分能量生产效率提高40.72%和49.81%;日光温室中,辣椒、西瓜和双孢菇的节水增收效果较好。由此提出发展马铃薯、油葵等低耗水高效模式,以玉米/豌豆、油葵/豌豆替代高耗水型模式春小麦/春玉米,日光温室重点发展辣椒、西瓜和双孢菇等作物的建议。     

花生高产栽培研究进展及我国南方花生高产途径分析

通过提高单产来增加总产是确保花生持续供应的根本途径.介绍了全球和我国花生的单产水平状况、高产纪录及产量潜力,并从高产花生的形态建成和生理生化特性、获得高产的自然条件和栽培管理措施等方面综述了国内外花生高产研究的进展,分析了造成我国南、北方花生单产差异的原因,阐述了我国南方花生进一步高产的途径.     

利用Wood模型拟合中国荷斯坦牛乳脂率变化的效果分析

为了解中国荷斯坦牛乳脂率变化规律,本文利用Wood模型对我国南方5个大中型奶牛场2008~2010年1~3胎中国荷斯坦牛33 194条测定日乳脂率进行曲线拟合。结果表明:中国荷斯坦牛乳脂率变化曲线为典型的倒抛物线形,第一胎拟合度最高(0.9820),第三胎最低(0.9789)。二胎牛乳脂率最先达到最低点(第16周),而三胎乳脂率最后达到(第19周)。就最低乳脂率而言,二胎牛最大(3.54%),而三胎牛最小(3.45%)。综合各方面情况得出,Wood模型适用于中国荷斯坦牛乳脂率变化的曲线拟合。     

村支书工作倦怠感研究

研究就村支书工作倦怠源、工作倦怠感以及心理上、生理上、行为上产生的一系列不良反应进行探索,并且给出改善工作倦怠感的建议和意见。     

三江源区不同高寒草地植物矿物元素含量特征及分析

本试验对三江源区不同高寒草地植物中6种矿物元素（钾K,钙Ca,钠Na,镁Mg,锌Zn,铁Fe）的含量进行了测定和分析,结果表明：植物中K元素含量为7.314～12.803 g·kg^-1之间,Ca元素含量为2.851～6.823 g·kg^-1之间,Na元素含量为64.404～185.553 mg·kg^-1之间,Mg元素含量为1.272～2.655 g·kg^-1之间,Zn元素含量为14.718～51.387 mg·kg^-1之间,Fe元素含量为161.056～531.677 mg·kg^-1之间;豆科（Leguminosae）植物和杂类草（Forbs）矿物元素含量显著高于禾本科（Gramineae）和莎草科（Cyperaceae）植物;植物中K元素与Mg元素、Ca元素与Na元素、Ca元素与Zn元素、Na元素与Zn元素含量之间呈极显著正相关关系（P<0.01）,Ca元素与Fe元素、Mg元素与Fe元素之间呈显著正相关关系（P<0.05）;根据美国国家研究理事会（National research council,NRC）绵羊日粮矿物元素需求标准,三江源区各草地植物中Na,Zn元素相对缺乏,其它4种元素均能满足放牧藏羊的矿物营养需求。     

Association between weight change during initial chemotherapy and clinical outcome in dogs with multicentric lymphoma

The majority of the known prognostic factors in dogs with lymphoma have been evaluated before treatment commences or at the time of diagnosis. Prognostic factors evaluated during the initial phase of treatment are less described but may provide important clinical information. In this retrospective study, 82 canine lymphoma patients were categorized according to the weight change between diagnosis and after 5 weeks of chemotherapy. Dogs that gained greater than 5% or lost greater than 5% of initial body weight were categorized as increased‐ or decreased‐weight groups, respectively. Those in which weight changed less than 5% were categorized as the maintained‐weight group. The median progression‐free survival (PFS) in the increased‐weight group, maintained‐weight group and decreased‐weight group was 226, 256 and 129 days, respectively. The decreased‐weight group had significantly shorter PFS than the increased and maintained groups (P = .023, P = .003, respectively). The median survival time (ST) in the increased‐weight group, maintained‐weight group and decreased‐weight group was 320, 339 and 222 days, respectively. There was no significant difference in ST among the three groups (P = .128). In Cox‐regression results, weight change group and initial body weight were significant risk factors associated to PFS (P = .007, P = .001, respectively) while only patient's initial body weight was a significant risk factor to ST (P = .013). In conclusion, evaluation of initial body weight and weight changes over time can provide valuable information regarding PFS and ST in dogs with multicentric lymphoma.     

抗旱、耐盐碱、矮秆陆地棉数量性状的遗传相关及主成份分析

对从国内外引进的抗旱、耐盐碱、矮杆棉花资源材料 ,经抗旱、耐盐碱、矮杆性鉴定和比较 ,选取了其中表现较好的 1 9份材料 ,进行了遗传相关和主成份分析 ,结果表明 :在 5 0 mmol· L- 1Na Cland1 0 0 mmol· L- 1Na Cl胁迫下的出苗率间呈正相关 ,抗盐性与产量间呈负相关 ;第一棉铃高度与纤维品质性状呈正相关。抗旱、耐盐碱、矮杆棉花材料的前 6个因子贡献率达 86.5 % ,其分别为第一棉铃高度因子、果枝数因子、单株结铃数因子、矮杆因子、单铃重因子等     

“西育1号”芹菜周年栽培技术

"西育1号"芹菜新品种于2009年10月通过陕西省农作物品种审定委员会登记。经过在西安三桥农场、西安市现代农业科技展示中心多年的多茬口栽培试验以及高陵、阎良、周至等区县的试验示范,总结形成了一套适合关中地区"西育1号"芹菜的优质高效周年栽培技术,以期为该品种的推广提供技术指导。     

Characterization,phylogenetic analyses and pathogenicity of Bipolaris setariae associated with brown stripe disease on sugarcane in Yunnan,China

Brown stripe disease is a severe foliar fungal disease of sugarcane worldwide and is widespread in all sugarcane planting areas in China. Brown stripe is a major disease that seriously affects the output and quality of the sugarcane industry in Yunnan Province, China's second-largest sugar base, while the pathogen of this disease remains not yet fully understood. To address this, we isolated and identified the fungi associated with 68 leaf samples showing typical symptoms of brown stripe from 22 sugarcane varieties in different areas of Yunnan Province. A total of 113 isolates were obtained, which were morphologically similar. Of these, 64 representative isolates were sequenced for the internal transcribed spacer region (ITS), GAPDH and EF-1α loci. All representative isolates grouped with the type strain of Bipolaris setariae in the phylogenetic trees inferred with individual and concatenated sequences of ITS, GAPDH and EF1-α. Pathogenicity test results showed that B. setariae strains were able to induce typical symptoms of brown stripe. The results obtained in this study clarify that only B. setariae is associated with sugarcane brown stripe in Yunnan, China. It is recorded here for the first time as a pathogen causing sugarcane brown stripe in Yunnan, and it is able to infect many major cultivars and new varieties, posing a new threat to the sugar industry in Yunnan Province. In addition, these results provide the scientific basis for the future breeding of disease-resistant varieties and effective prevention and control of sugarcane brown stripe disease.