三级流道结构滴灌带的水力性能试验

该试验测定了两种三级流道结构滴灌带压力－流量关系和出水口流量偏差系数，并采用模拟堵塞方法对各级流道堵塞情况下出水口流量变化进行观测，试验表明：相同的流道断面，不同的流道结构对出水口流量和流态指数产生较大的影响；当某一级流道堵塞时，全程贯通式多级流道具有明显的流量互补效果；第I级流道堵塞影响范围较大、出水口流量减少率较高。     

车辆行驶的表层沙土非线性弹性本构模型的试验研究

以车辆行驶的表层沙土为研究对象，用土壤动态三轴仪对车辆行驶的表层沙土的力学特性进行了试验研究，建立了适于车辆行驶的表层沙土的非线性弹性邓肯（Ｄｕｎｃａｎ）本构模型。研究结果表明它能够较好地反映车辆行驶的表层沙土的本构关系，为车辆行走机构与表层沙土相互作用的力学计算分析和研制沙漠运输车辆奠定了基础     

西北地区植被恢复与建设的原则

 在分析植被建设工程存在问题的基础上,提出我国西北地区实施退耕还林、天然林保护、防沙治沙等工程的植被建设中需遵循8项原则:统一规划与协调一致的原则;建设多类型植被,以地带性植被为主的原则;建设手段采用人工与天然相结合,以天然为主的原则;保护、开发利用相结合,以保护为主的原则;充分利用种质资源,以乡土树种为主的原则;合理利用水资源,建设以免灌溉植被为主的原则;乔灌草相结合,以灌草为主的原则;多种繁殖材料相结合,以种子繁殖和天然“克隆”为主的原则。     

In vitro suppression of quercetin on hypertrophy and extracellular matrix accumulation in rat glomerular mesangial cells cultured by high glucose

Quercetin's protective effects on the glomerulosclerosis of diabetic nephropathy (DN) in rat mesangial cells were investigated. The cell cycles, type IV collagen and laminin, TGF-β₁ mRNA, Smad 2/3 and Smad 7, and activities of cell antioxidases were measured. Compared with the high glucose group, quercetin may decrease the cell percentages of G₀/G₁ phase, Smad 2/3 expression, laminin and type IV collagen, and TGF-β₁ mRNA level significantly. The antioxidant capacity, the cell percentages of S phase and Smad 7 expression was significantly increased by quercetin. These results suggest that quercetin is a protective agent against glomerulosclerosis in DN.     

含乳饮料概述

介绍了含乳饮料的定义、分类以及我国含乳饮料的发展现状,同时还分析了我国含乳饮料的未来发展方向。     

黑龙江垦区中低产田利用改良规划

为了提高单位面积的产量,通过二年的调查研究,对黑龙江垦区中低产田的划分标准、评价和划分方法,中低产田类型、面积、分布、利用途径和改良规划进行了详尽讨论。在九个国营农场管理局耕地中,中低产田总面积为2153.57万亩,占总耕地面积的74.58%。对中低产田应按不同类型采取相应措施进行改良。总投资约需15—20亿元,年增收粮豆约16—20亿公斤。     

元宝枫栓皮栎苗木水力结构特征的对比研究

元宝枫(Acer truncatum)是散孔材树种,栓皮栎(Quercus variabilis)是环孔材树种,为了解二者在水分运输和耐旱机理方面的特点,该文应用水力结构的基本理论,在正常水分条件下,用改良的冲洗法测定4年生元宝枫、栓皮栎苗木各部位的水力结构参数. 实验和模拟的结果表明,元宝枫和栓皮栎苗木都存在限速区;在非限速区,二者各部分木质部的导水率、比导率、叶比导率和胡伯尔值都随功能木质部直径的增加而增大,但表现出不同的变化趋势,这些变化较好地说明元宝枫和栓皮栎苗木耐旱的生态策略. 在功能木质部直径相同的情况下,栓皮栎苗木的各水力结构参数均较元宝枫苗木大.     

2007年巢湖市稻纵卷叶螟发生特点原因分析及防治对策

本文运用系统测报调查数据、气象资料,分析了2007年巢湖市稻纵卷叶螟发生特点和主要原因,阐述了稻纵卷叶螟化学防治对策。     

Interactive effects of organic fertilizer, CaSO4 and amino acid Ca on Fuji apple in Burozem soil in China

A two-year trial was conducted to test the interactive effects of special-for-apple organic fertilizer, CaSO₄, and amino acid Ca on Fuji/Balenghaitang (Malus robusta Rehd.) rootstock in Burozem soil in China. Total Ca, exchangeable Ca, and fruit Ca were significantly improved by the soil application of CaSO₄ with the highest exchangeable Ca and fruit Ca observed in Fuji apple trees treated at the rate of 3.5 kg CaSO₄ per tree. 3.5 kg CaSO₄ was divided into two applications, with first application in the first month after full bloom, and the second in the second month after full bloom in summer, progressively to improve fruit Ca concentration. Dividing CaSO₄ into two applications in combination with organic fertilizer or amino acid Ca spray, proved to be more effective on improving the fruit Ca concentration, with the highest level of 179.17 mg/kg FW in Fuji apple trees treated with 2 kg CaSO₄ applied and amino acid Ca sprayed in the first month after full bloom, 1.5 kg CaSO₄ applied in summer, organic fertilizer applied in winter. Organic fertilizer applied in winter alone remarkably improved the fruit Ca concentration, as well as storage Ca in roots and stems, and the best effect was observed in Fuji apple trees which were supplemented organic fertilizer (10 kg) in winter and CaSO₄ (1 kg) in the first month after full bloom per tree. The effect on Ca increment became less pronounced when the amount of organic fertilizer reached 15 kg or CaSO₄ was more than 3.5 kg per tree. There was a positive correlation between the Ca/Mg ratio in soil and fruit, exchangeable Ca, and fruit Ca concentration, while a negative correlation was observed between the N/Ca ratio in fruit, available P, available K in soil, and fruit Ca concentration. Both N/Ca ratio and Ca/Mg ratio in fruit were affected by different fertilization regime, and bitter pit incidence at the end of storage kept acceptable only if N/Ca < 17 and Ca/Mg ≥ 7 at harvest. The commercial fertilization regime turned out to be organic fertilizer in combination with CaSO₄ applied in soil in winter, amino acid Ca sprayed in the first month after full bloom, and CaSO₄ applied in soil in summer. __________ Translated from Journal of Fruit Science, 2007, 24(1): 6–10 [译自: 果树学报]     

贵州省植烟土壤氮素释放特征研究(Ⅲ)--不同栽培措施对黔南烟区烤烟质量的影响

烤烟生长后期土壤氮素供应不同将导致烤烟上部叶品质差异,试验表明,不同处理的上部叶总氮和烟碱含量差异显著,提前起高垄深移栽盖膜处理上部叶总氮和烟碱含量最接近优质烤烟标准.