小熊猫日粮营养成分分析

对成年小熊猫日粮的采食量以及日粮中的主要营养成分含量进行了测定。试验结果表明,平均每只小熊猫每天摄入蛋糕77.61g、馒头96.28g、苹果456.83g和竹叶90.97g;平均每只小熊猫每天摄入粗蛋白48.28g、粗脂肪13.56g、粗纤维65.30g、灰分23.39g;总日粮的干物质中,粗蛋白含量为26.82%、粗脂肪含量为7.53%、粗纤维含量为36.28%、灰分含量为12.99%、水分含量16.37%。     

小熊猫犬瘟热病毒感染的诊断

对某动物园发病死亡小熊猫的病料进行电镜检查 ,发现了犬瘟热病毒 ( CDV)样病毒粒子 ;病料用 RT-PCR检测 ,均为 CDV阳性 ,并从部分病料中分离出了 CDV,说明小熊猫存在 CDV感染。用从小熊猫肝脏病料中分离的 CDV LP株接于幼犬 ,结果所有接种犬均发生了犬瘟热。中和试验结果表明 ,LP株是一免疫原性强的 CDV株。     

Physical properties of two tropical wood species from Mozambique

Abstract

The aim of this study was to reveal some important physical properties of two lesser used wood species from Mozambique. Density of wood, green moisture content (MC), shrinkage, swelling, sorption–desorption behaviour and quantitative colour analyses were carried out to facilitate the potential use of Icuria dunensis (ncurri) and Pseudolachnostylis maprounaefolia (ntholo). The study found that the average densities at 12% MC were 907.1 kg m^?3 for ncurri and 1023.4 kg m^?3 for ntholo. The average values of green MC were 31.4% for ncurri and 39.2% for ntholo. Ncurri and ntholo wood showed low coefficients of anisotropy for heartwood, 1.3 and 1.4, respectively. The colour measurements described the patterns of radial and longitudinal variations in wood colour. In conclusion, ntholo and ncurri are characterized by high density and dimensional stability. Ntholo can be used where small dimensional changes are required, e.g. in joinery, flooring and furniture.     

施肥技术对茶树主要病虫害及天敌田间发生量的影响

为了探明施肥技术对茶树主要病虫害田间发生量的影响,2010年贵州茶树病虫防控课题组在贵阳春秋实业有限公司基地,采用不同肥源、不同施肥方式与不同施肥量等措施进行了田间小区施肥对比试验.结果表明:茶饼病5月份以根灌沼液肥500 kg/667m2的处理最为明显,田间未发现病斑,相对防效为100％,9月份以根灌沼液肥2000 ...     

Multi-scale effects of habitat loss and fragmentation on lesser prairie-chicken populations of the US Southern Great Plains

Large-scale patterns of land use and fragmentation have been associatedwith the decline of many imperiled wildlife populations. Lesserprairie-chickens(Tympanuchus pallidicinctus) are restricted to thesouthernGreat Plains of North America, and their population and range have declined by> 90% over the past 100 years. Our objective was to examine scale-dependentrelationships between landscape structure and change and long-term populationtrends for lesser prairie-chicken populations in the southern Great Plains. Weused a geographic information system (GIS) to quantify landscape composition,pattern and change at multiple scales (extents) for fragmented agriculturallandscapes surrounding 10 lesser prairie-chicken leks. Trend analysis oflong-term population data was used to classify each population and landscape(declined, sustained). We analyzed metrics of landscape structure and changeusing a repeated measures analysis of variance to determine significant effects( = 0.10) between declining and sustained landscapes across multiplescales. Four metrics of landscape structure and change (landscape change index,percent cropland, increases in tree-dominated cover types, and changes in edgedensity) contained significant interactions between population status andscale,indicating different scaling effects on landscapes with declining and stablepopulations. Any single spatial scale that was evaluated would not have givencomplete results of the influences of landscape structure and change on lesserprairie-chicken populations. The smallest spatial scales (452, 905, and 1,810ha) predicted that changes in edge density and largest patch sizewere the only important variables, while large-scale analysis (7,238ha) suggested that the amount of cropland, increase in trees(mostly Juniperus virginiana), and general landscapechanges were most important. Changes in landscape structure over the pastseveral decades had stronger relationships with dynamics of lesserprairie-chicken populations than current landscape structure. Observed changessuggest that these local populations may be appropriately viewed from ametapopulation perspective and future conservation efforts should evaluateeffects of fragmentation on dispersal, colonization, and extinction patterns.This revised version was published online in May 2005 with corrections to the Cover Date.