遵义烟区规模化繁殖烟蚜茧蜂中繁蚜烤烟品种的筛选

为明确遵义烟区最适繁蚜的烤烟品种,比较7个品种的繁蚜量、烟株主要农艺性状的变化和单位面积蚜量动态,并计算不同品种的耐蚜指数。结果表明,贵烟1号的繁蚜量和烟株耐蚜性最好,其次是K326,建议选择贵烟1号和K326作为遵义烟区烟蚜茧蜂规模化繁殖体系中繁蚜的首选烤烟品种。     

河北省黄骅市土地生态系统服务价值测算及动态变化研究

土地利用和生态系统服务价值变化对区域生态建设及可持续发展具有重要意义。以河北省黄骅市为研究区域,基于ENVI和ArcGIS软件平台,通过解译黄骅市1990年、2000年、2010年三期遥感影像图,分析了研究区土地类型及生态系统服务价值变化情况。结果表明:研究期间地类呈现"二增五减"的变化规律,园地、建设用地分别增加1 268.95,4 873.54hm2,耕地、草地、水域、盐碱地和未利用地均减少;土地生态系统服务价值构成中,耕地、水域和盐碱地3种土地生态类型贡献较大,土地生态系统总服务价值20a间减少了7 257.40万元。黄骅市土地生态类型变化对生态系统产生负面影响,生态环境质量降低。     

贵州废弃铅锌矿区优势植物中铅、锌、铬含量及富集特征

以贵州废弃DW铅锌矿区27种优势植物为研究对象,利用原子吸收、原子荧光测定植物体内Zn、Cr、Pb的含量,研究了矿区植物中的Zn、Cr、Pb的含量积累特征及植物对它们富集能力。结果表明,大多数植物中的重金属积累量由大到小的顺序为Zn、Pb、Cr,但富集系数由大到小的顺序为Cr、Zn、Pb。受矿区环境及Zn适应的影响,植物对Zn富集系数较小,Zn在百合科萱草中的积累量为1 650.27 mg/kg;地笋对Cr的富集系数为0.591,可作土壤重金属Cr污染修复植物;所研究的植物均不适合作重金属Pb的土壤环境修复植物。     

基于GIS的基本农田空间连片性评价研究——以佛山市高明区为例

为建成大面积连片的基本农田,就必须考虑基本农田的空间连片性.该研究针对目前区域基本农田存在的基本农田调整后其空间连片性无从评价的问题,基于GIS空间分析技术,并以广东省佛山市高明区基本农田规划调整前后的连片性对比分析为例,引入基本农田连片性指数概念,提出了较为高效、简便的基本农田连片性评价方法,为科学评价基本农田连片性提供了依据.     

保山昌宁烟区土壤和烟叶中矿质元素分析研究

[目的]为了协调烟叶化学成分,提高烟叶品质.[方法]对保山昌宁主烟区植烟土壤和烟叶中微量元素进行分析.[结果]烟叶中锌、锰、铜含量与土壤中对应元素显著正相关,昌宁县三烟区土壤铜、铁含量丰富,锌、锰缺失,其中11.14％土壤缺锰,2.05％的土壤严重缺锌;烟叶中铜含量偏高,铁含量偏低,锌含量适中.[结论]在烤烟生产上要注意增施锌肥,控制铜肥,喷施锰肥.     

浅析环境中的障碍设置

环境中的障碍包括视觉障碍、行为障碍和精神障碍。在环境规划设计时,合理设置障碍不但能增加景观的层次性,提高人们的审美情趣,还能减少人在环境中的破坏行为,同时可以形成一道美丽的风景。     

Genotypic Difference in the Responses of Seedling Growth and Cd Toxicity in Rice (Oryza sativa L.)

The experiment was carried out to study the genotypic difference in the responses of seed germination, growth and physiological characters of rice seedlings to Cd toxicity. The result showed that the germination was slightly stimulated under low Cd concentration (0.01-1.5 mM Cd), while severely depressed under higher Cd concentration (2.0 mM). Rice seedlings exposed to 0.01 mM Cd showed slight increases in plant height, root volume, biomass and chlorophyll concentration. These parameters were significantly reduced when Cd level in the medium was increased to 0.5 mM, and meanwhile corresponding increase in superoxide dismutase (SOD) and peroxidase (POD) activities, and MDA (malondialdehyde) content was observed. However, SOD and POD activities declined when plants were exposed to 1 mM Cd when compared with those under 0.5 mM Cd. Cadmium addition lowered Fe, Cu and Mn concentrations in roots and shoots. There was significant genotypic difference in the response of these parameters to Cd stress. Under Cd stress, Xiushui 110 had the least inhibition of growth and increase in MDA content, higher shoot Cd concentration, and greatest increase in POD and SOD activities, indicating its higher tolerance to Cd toxicity, while Bing 9914 had the greatest reduction of growth, and Zn, Cu, Fe, and Mn contents, but greatest increase in MDA content, and least increase in activities of antioxidative enzymes, indicating its sensitivity to Cd toxicity.     

我国农机制造业的创新之道--以PLM环境下并行工程应用为例

发展我国农机制造业必须着眼于企业核心竞争力的构建,本文提出用PLM环境下并行工程理论为指导,在农机制造企业中导入现代制造管理技术和先进的产品设计方法,改进产品设计和生产方式,以提升我国农机制造业总体水平。     

Stress Measuring during the Construction Monitoring of Weisheng River Bridge in Guangzhou

In this paper,the simulation calculation of Weisheng River Bridge was firstly conducted.Based on it,the measuring points and methods for stress measuring and calculation approach for real stress were introduced.The measured results matched the calculated results very well.Stress measuring during the construction monitoring can serve as references and guides of the structural situations during the different bridge construction process.     

毛豆用早熟高产抗病大豆新品种黑河24

黑河24是黑龙江省农科院黑河农科所,经有性杂交育成的大豆新品种.具有早熟、高产、抗病、质佳、适应性强、适于机械化栽培等特点,适于内蒙南部、辽宁等地做毛豆.生育日数110 d左右,需活动积温2 100℃.本文针对黑河24大豆主要特点进行分析,提出了在栽培技术上应注意的问题.