毛鸡骨草GAP基地土壤肥力综合评价与供肥能力研究

[目的]了解毛鸡骨草GAP基地土壤肥力现状,以及土壤中氮、磷、钾3要素的自然供给能力。[方法]运用改进的内梅罗(Nemoro)综合指数法对基地土壤肥力进行综合评价,并通过施肥试验研究了基地土壤中氮、磷、钾3要素的自然供给能力。[结果]土壤综合肥力系数为1.21,毛鸡骨草产量对土壤的依存率为40.90%。[结论]基地土壤综合肥力属"一般"等级,土壤供应氮、磷、钾的能力分别处于"低"、"高"、"中"等级,较低的土壤含氮量是该基地的主要养分限制因子。     

水锤泵进水系统的试验与分析

着重对水锤泵的进水管直径,倾角及管长进行试验分析,从而提高了水锤泵的提水效率,增强了其适用性。     

农林高校工业工程核心课程体系的构建研究

以农林高校工业工程专业在新形势下的专业核心课程体系设置为研究对象,对东北林业大学工业工程专业学生进行了问卷调查,问卷中定位了4个培养目标和13个能力要求。通过对培养目标和能力要求的信度和效度进行检验,说明了4个培养目标和13个能力要求制订的合理性。由Q型聚类分析得出能力要求的设置符合培养目标的定位。根据定位的培养目标,设定了9门核心课程,应用SPSS分析软件得出了9门核心课程分别与13个能力要求的相关程度,并由ABC分类法将9门核心课程分为3类。该研究旨在为今后农林高校工业工程人才培养方案的修订奠定良好的基础。     

聊城市自然资源动态及其与人口发展的关系

根据1999～2008年聊城市土地资源和人口的相关数据,采用自然资源承载力的研究方法,分析了聊城市自然资源与人口动态变化的关系。结果表明,耕地总体趋势下滑,林地、园地和城乡居民点与工矿用地缓慢增加,根据土地资源与人口的互动关系分析,得出聊城土地资源还能够承载市现有人口,但对森林资源和水资源造成很大的压力。     

山西省不同资源型地区生态足迹及可持续发展评价

通过聚类分析,将山西的119个县区按照资源的属性,分成矿产资源型地区、农业资源型地区、综合资源型地区、资源匮乏型地区、特色资源型地区等5类不同资源型地区,选取有代表性的县市区作为研究对象,应用生态足迹模型分析其生态经济系统可持续发展状况。结果表明,可持续性石楼县(资源匮乏型地区)>河津市(特色资源型地区)>太谷县(农业资源型地区)>榆次区(综合资源型地区)>盂县(矿产资源型地区),并针对各区域的特点提出相应的转型对策。     

莎车县地形对耕地地力质量的影响及改良对策

土壤发育与地形密切相关,而在土壤发育过程中不同的地形就会对耕地有效土层厚度、灌溉条件和植被产生一系列的重要影响,根据莎车县的地形与土壤形成的关系将莎车县地形概括为5种类型,分别为冲积洪积扇上、中、下部,沙漠边缘,山前洪积平原;依据专家评定出对莎车县耕地地力影响比较大的12个因素和耕地地力评价系统,以不同地形部位的尺度对莎车县耕地地力质量等级划分的影响进行系统分析,明确制约因素,提出更有效的改良利用措施,为提升莎车县耕地高效利用提供科学依据。     

Contribution of low molecular weight antioxidants to the antioxidant screen of germinated soybean seeds

Soybean seed of the Mazovia variety (Glycine max) were germinated in the dark at a constant temperature of 25°C up to 168 h (24 h × 7). Changes in content of low molecular weight antioxidants (LMWA) in the course of germination were studied. The analyzed compounds were: total phenolics, soluble proteins, tocopherols (-T, -T, -T, -T), reduced and oxidized glutathione, L-ascorbic acid and L-dehydroascorbic acid. The changes in total antioxidant status (TAS) and the peroxyl radical-trapping capacity (PRTC) of the processed seeds were measured and compared to those of the raw seeds. On the basis of data obtained, the contribution of LMWA to the TAS of raw and germinated soybean seeds was calculated. The results showed a very high molar percentage contribution of phenolic compounds (49.7%) in opposition to glutathione (7.0%), tocopherols (4.0%) and soluble protein (5.7%) to the total TAS of raw soybean seeds. The germination process led to the increased contribution of phenolic compounds (67.7%), soluble proteins (9.3%) and ascorbic acid (4.4%) to the total TAS of germinated seeds and as a result, a decrease in the antioxidant gap was observed compared to the total TAS of raw soybean seeds. This study showed that the contribution of experimentally obtained total PRTC to the total TAS of raw and germinated soybean seeds after seven days ofthe process was 48% and 25.2%, respectively. The PRTC results were comparable to those obtained in TAS only when calculation was done by multiple mean values for content of investigated compounds and their relative potency with respect to Trolox. The PRTC values obtained in this manner were higher than those obtained experimentally indicating that high molecular weight antioxidants as well as are able to quench peroxyl radicals as well as low molecular weight antioxidants. Therefore, calculation of PRTC is a more accurate method that eliminates the puzzling question of unidentified antioxidants shown as the antioxidant gap in the TAS assay.     

Variation Of Water Retention In Various Soils Of Kuwait

Soil properties varied in water retention; due to soil texture and organic matter content. Variations of texture in many soils are effected mostly to soil forming factors of parent materials of the soil, biological activities, climactic variation, and duration of soil reaction. While the organic matter contents are affected totally by the environmental conditions of the soils. Water holding capacity of different soils influences plants growth and development in diverse soil characteristics of the world and determines soil productivity. Water resources for agricultural activities are limited, particularly in arid environment and soil water holding capacity of arid soil is very low. Kuwait can be good example of arid environment with limited water resources for agriculture activities and possess soil of coarse texture with very low organic matter content (Anonymous, 1997). Agricultural development in Kuwait meets many problems for crop production and urban landscaping. Water resources are limited and the quality is deteriorating at the same time soil water holding capacity is very low. Enormous amount of water, particularly desalinated expensive water is wasted for agricultural activities. This paper will study various parts of Kuwaiti soils water holding capacity and develop water retention data for efficient water irrigation and improvement of plant growth.     

移民收入差距及其影响因素分析——以宁夏移民区为例

影响搬迁移民收入的因素很多,有自然.因素,也有农民个人因素.该文从家庭因素、个人能力因素等方面对宁夏红寺堡区2000年前吊庄移民和2000 ～ 2010年生态移民收入差距影响进行分析,探讨如何正确看待农民收入差距问题以及整体提高农民收入的问题.