库尔勒市个体养驴户驴乳常规成分检测与效益分析

<正>1乳驴养殖方式在2013年10月18日~20日和11月8日~10日,到库尔勒市英下乡英下村2组的乳驴养殖户养殖的6头产乳驴和库尔勒市恰尔巴克乡哈尔东村3组所养殖的4头产乳驴的乳进行了抽样检测。2013年1月开始,英下村二组养殖户为全舍饲养殖泌乳驴22头,其中目前挤乳带驹的母驴6头。哈尔东村3组养殖户的养殖方式也是全舍饲,4头带驹的母驴都产乳驴,挤乳供给城市需要驴乳的市民。两家养殖的产乳驴全舍饲养殖,每头母驴饲喂混合精料3     

体重决定猪回肠内的蛋白吸收率

<正>近期伊利诺伊大学的J.A.Almeida博士、 Hans H.Stein博士以及Carsten Pedersen博士联手展开体重对于标准化回肠蛋白质和氨基酸吸收率的影响试验,结论证明,20 kg以下的仔猪回肠对于粗蛋白和氨基酸的吸收率比20~50 kg的育成猪和50~110 kg的育肥猪低。而且同一猪群的不同猪只也表现出吸收率的差异性。例如,在测定的300只仔猪中粗蛋白和氨基酸的吸收率     

Research Advancement in Genetic Variation of Wood Properties

The genetic improvement of wood properties is one of the important measures of improving wood quality. To achieve that, forestry and wood scientists have done a great deal of research in expectation to produce more high-quality wood. The paper summarizes the researches on genetic variation and genetic correlation of wood properties and proposes the prospects to conduct the genetic improvement of wood properties.     

半干旱地区八种杨树无性系间苗期净光合速率变化的研究*

辽宁省建平县半干旱地区不同来源的８种杨树无性系净光合速率（Ｐｎ）达到了显著和极显著的差异水平，无性系间的净光合速率可分为高中低三个类群，即：昭林场６号、群众杨、赤峰杨３４号、欧症状杨４７、小黑肠、小青杨、帝国杨５１号、欧美杨６４。具高光合速率的昭林场６号，受光量作用大，但受湿度、空气蒸汽压影响小，适应于具有干热天气的半干旱地区；而低光合类群的三个无性系则不同，其中欧美杨６４一直与光、湿度和蒸汽压的     

社区林业政策对尼泊尔农村生计的影响

尼泊尔引入社区林业管理已有20多年。虽然有社区林业管理促进了公有林和私有林树木生长的报道,但其对当地社区获得林产品,如木材、薪柴,以及其他非木材林产品(NWFP)的促进作用还没有完全得到证实。此外,社区林业的介入有明显的社会效益。通过资料收集和实地考察分析了尼泊尔中部山区执行社区林业政策对社会经济的影响。     

彩色豆马勃菌剂的应用研究

外生菌根真菌——彩色豆马勃(豆包菌)Pisolithus tinctorius(Pers.)Coker and Couch(简称P_t)。应用彩色豆马勃商品化菌剂对我国一些重要用材树种进行菌根化的研究,评价这些树种对P_t菌剂的反应,各种菌剂的效果及其应用前景,为在我国林业生产和环境保护中推广和应用P_t技术及其菌剂提供基础。     

Monitoring Forest Fire with MODIS-NDVI Images in Beijing

INTRODUCTION The moisture content of fuel is a critical parameter in fire ignition because flammability is closely dependent on it (Dimitrakopoulos et al. 2001). Dead fuel lying on the forest floor (fallen branches, litter, foliage) is the most dangerous because it is drier than live fuel and more dependent on rapid atmospheric changes. The moisture content of live fuel plays a marginal role in fire ignition, but it is critical in fire propagation modeling because the amount of water is d…     

Assessing Threats and Setting Conservation Priorities for Plant Species between Forest and Meadow Ecotone in Sanjiangyuan Nature Reserve, China

INTRODUCTIONA large number of nature resources have fosteredhuman beings in the world. However, during the lastfew decades these nature resources and biodiversitywere subjected to various anthropogenic pressuressuch as plantation, deforestation, construction ofhydro-electric project, overgrazing and exploitation andother developmental activities (He Youjun, et al, 2004b;Li Ang, et al, 2002; Swamy, et al, 2000). In order toprotect environment and biodiversity, we have to facethe challenge…     

Analysis of Sediment Source of Watershed in Western Shanxi of the Loess Plateau

1 INTRODUCTIONThe Loess Plateau is the most drastic soil erosion regionin China, with the most severe water erosion. Thedistribution of types and intensity of erosion not onlyhave regional diversity but also have perpendicularvariation. In the small watershed, there are differencesin erosion characters among its upper, middle and lowerreaches. It is very significant for taking rationalmeasures of soil and water conservation and forpreventing soil and water loss to analyze the relationbe…     

Researches and Application of Fuelbreaks in China

The fuelbreaks were established in south China from 1950s. With the active work of local communities and state government, the fuelbreaks have been built for 398,000 kilometers. In some areas, fuelbreaks and firebreaks have constructed a network primarily, such as in the provinces of Fujian, Guangdong, Guangxi. The fuelbreaks can prevent forest fire effectively. That has been approved by actual examples and burning tests. The fuelbreaks also benefit the forest ecosystem and environment. This paper makes a review on fuelbreaks research and application in China, discussed present research achievements about fuelbreaks mechanism and its development. In the future, the Chinese government and local communities will increase investment in the construction of firebreaks network with fuelbreaks as focal points.