小尾寒羊在陕北吴旗县的适应性观测

本文通过对小尾寒羊引入吴旗县后生理指标，体尺，体重，繁殖性能的调查观察，得出其生长发育，繁殖性能与原产地基本一致。表现出良好的适应性，并提出了今后的发展建议。     

雪青等6个梨品种引种试验

为增加湖南省梨树品种的数量，2000年2月，湖南农业大学园艺园林学院从浙江大学园艺系引进雪青、雪芳、雪英、雪峰、青魁、新雅等优良梨新品种，以黄花梨为对照，分别高接在湖南农业大学果树示范场、湘潭县响水乡青竹村与怀化市鹤城区农业局等地．从2000年高接后至2002年12月对其进行观察记载．结果表明：新雅、雪峰、雪英等品种在长沙、湘潭、怀化等地均表现出良好的生长结果性状和较强的抗病能力，可在湖南适量发展．     

不同硒水平对生长育肥猪血液生化指标的影响

试验研究了宁夏常用饲料中不同硒水平对生长育肥猪血液生化指标的影响。结果表明 :(1 )谷胱甘肽过氧化物酶 (GSH PX)活性随饲粮硒水平的增加 ,呈现下降 上升 下降的动态变化趋势。谷胱甘肽硫转移酶可反映缺硒的程度。 (2 )缺硒组仔猪血硒含量和全血中GSH PX均处于缺硒边缘状态 ,在临界值以下 ,不能满足仔猪的代谢需要。 (3)随饲粮硒水平的逐渐增加 ,猪瘟的抗体水平和淋巴细胞转化率明显升高 ,以饲粮中添加硒 0 45mg/kg时达到最高 ,仔猪发病率最低     

内蒙古西鄂尔多斯孑遗植物富集带牧农区生物多样性及其保护途径

通过分析西鄂尔多斯第三纪孑遗植物富集带农牧区生物多样性现状以及目前存在的主要问题,提出保护该区域珍稀濒危植物和生物多样性的有效途径。     

Towards an index of all known species: the Catalogue of Life,its rationale,design and use

The Catalogue of Life, created by Species 2000 and the Integrated Taxonomic Information System, has the ambitious aim of creating a uniform and validated index of the world's known species for use as a practical tool in inventorying and monitoring biodiversity worldwide. This is achieved by accessing an array of taxonomic databases created and made available by individual, project and institutional custodians through taxonomic and biodiversity initiatives. A standard data set is delivered for every known species, drawn from Species 2000 contributing databases. Data are provided to the Species 2000 Philippine office, compiled annually and published in CD‐ROM format. Species 2000 also includes the Species Locator Service, which gives a responsible opinion as to the actual species currently recognized by taxonomists and their accepted names, and the Name Service that assists users in checking the spelling and original publication details for a wider range of names, including species not yet incorporated in the Species Locator Service. The Species Locator Service is available as the Dynamic Checklist, which is used to search for the scientific name of an organism online, and the Annual Checklist, which is a stable index produced once a year and is available on CD‐ROM and online. Catalogue of Life currently covers more than 272 000 species and 32 000 infraspecies, with 181 000 synonyms. It has 217 000 common names, 87 000 references and 20 contributing databases that encompass all known animals, plants, fungi and microorganisms.     

缓/控释肥料在草坪中的应用研究概述

介绍了缓/控释肥料的概念、种类及养分释放机理,着重对缓/控释肥料在草坪草上的应用效果和评价指标进行了综述,并提出了我国草坪缓/控释肥料研究中存在的问题及解决思路。     

小型水稻联合收获机的性能分析与发展探讨

介绍了湖南省几种与水田耕整机配套的小型水稻联合收获机的结构特点及主要性能指标，分析了配套动力、整体配置及割台和脱粒部件的选择问题，并提出了该机器的改进意见。     

退化草原定量化放牧条件下土壤动物的比较研究

在以冷蒿（Artemisia frigda）、糙隐子草（Cleistogemes sprrosa）、冰草（Agropyron cristatum）、寸草苔（Carex duriusula）等为主的退化草原上,是置以4、8、12、16、20只内蒙古细毛羊和零只羊（对照区）指标定量化的牧压梯度系列（均为100×100m2面积的放牧围栏试验小区）的土壤动物比较研究表明：其中以8和12只羊小区的土壤动物群落结构复杂而稳定，8只羊小区的土壤动物数量高于12只羊小区；多样性指数、均匀度、丰富度两者均较高，丰富度前者大于后者，理论上，8只羊／公顷是较理想的牧压指标。4、16、20只羊小区的土壤动物种类和数量明显减少，多样性指数、均匀度均低、20只羊／公顷小区由于少数种类数量高至使多样性指数偏高；三者的丰富度均低，综合分析认定为不可取的牧压指标。植食和捕食性的土壤动物与牧压呈负关联，杂食和粪食性土壤动物则与收压呈正关联。土壤动物各类群中以鞘翅类（Coleoptera）随牧区梯度的改变而呈规律性变化，是较理想的监测草原退化的生物指标。     

Effects of changing landscape pattern and U. S. G. S. land cover data variability on ecoregion discrimination across a forest-agriculture gradient

We examined the use of coarse resolution land cover data (USGS LUDA) to accurately discriminate ecoregions and landscape-scale features important to biodiversity monitoring and management. We used land cover composition and landscape indices, correlation and principal components analysis, and comparison with finer-grained Landsat TM data, to assess how well LUDA data discriminate changing patterns across an agriculture-forest gradient in Minnesota, U.S.A. We found LUDA data to be most accurate at general class levels of agriculture and forest dominance (Anderson Level I), but in consistent and limited in ecotonal areas of the gradient and within forested portions of the study region at finer classes (Anderson Level II). We expected LUDA to over-represent major (matrix) cover types and under-represent minor types, but this was not consistent with all classes. 1) Land cover types respond individualistically across the gradient, changing landscape grain as well as their spatial distribution and abundance. 2) Agriculture is not over-represented where it is the dominant land cover type, but forest is over-represented where it is dominant. 3) Individual forest types are under-represented in an open land matrix. 4) Within forested areas, mixed deciduous-coniferous forest is over-represented by several orders of magnitude and the separate conifer and hardwood types under-represented. Across gradual, transitional agriculture-forest areas, LUDA cover class dominance changes abruptly in a stair-step fashion. In general, rare cover types that are discrete, such as forest in agriculture or wetlands or water in forest, are more accurately represented than cover classes having lower contrast with the matrix. Northward across the gradient, important changes in the proportions of conifer and deciduous forest mixtures occur at scales not discriminated by LUDA data. Results suggest that finer-grained data are needed to map within-state ecoregions and discriminate important landscape characteristics. LUDA data, or similar coarse resolution data sources, should be used with caution and the biases fully understood before being applied in regional landscape management. This revised version was published online in July 2006 with corrections to the Cover Date.     

The history and survival of traditional heirloom vegetable varieties in the southern Appalachian Mountains of western North Carolina

Southern Appalachia is unique among agroecological regions of the American South because of the diverse environmental conditions caused by its mountain ecology, the geographic and commercial isolation of the region, and the relative cultural autonomy of the people that live there. Those three criteria, combined with a rich agricultural history and the continuance of the homegardening tradition, make southern Appalachia an area of relatively high crop biodiversity in America. This study investigated the history and survival of traditional heirloom vegetable crops in western North Carolina and documented 134 heirloom varieties that were still being grown. I conducted interviews with 26 individuals from 12 counties in western North Carolina. I used a snowball sampling method to identify individuals or communities that maintained heirloom vegetable varieties, and used the “memory banking” of farmers’ knowledge as a strategy to complement the gathering of seed specimens. Most of the varieties were grown and saved by homegardeners; beans were the most numerous. Results indicate that usually only one or two individuals in a community maintained significant numbers of heirloom varieties and that many communities have lost their heirloom vegetable heritage altogether. The decline of the farming population combined with a lack of cultural continuance in family seed-saving traditions threatens the ability of communities to maintain crop biodiversity. Some of the cultivars may represent the last (small) populations of endangered varieties.