描述:
ttention, but
also agriculture and eco-environmental sustainable development important
problems. Farming-pastoral Transitional zone in north China, as our county
returning farmland to forest and returning cropping land to grassland are the
focus areas, natural environment and socio-economic conditions shown a
clear transition characterized by the transition zone of the interpenetration and
staggered distribution of agriculture and animal husbandry, which is curbing
desertification important ecological barrier, but also ecologically fragile belts.
描述:
duction in the area is
restricted by disadvantageous natural resources and environmental conditions,
including low arable land area per capita, frequent drought events and a landscape
dominated by mountains. Forage crop rotation systems could improve soil fertility,
increase crop外eld and provide quality forage supplies for livestock production.
Additionally, their adoption is considered a suitable means to advance sustainable
agriculture development. In this study, the role and status of forage crop rotations in
Tianshui city were studied.
描述:
siea. Low temperature is the key factor that limits
the growth, colour and appreciatability in winter in the northern of China. Introducing foreign gene
into kale through genetic engineering may create novel variety with cold tolerance. In this study,
BADH(encoding betaine aldehyde dehydrogenase) and TCH(encoding transcription regulation
factors) were used to be transformed into kale with Agrobacterium-mediated transformation.
描述:
an’s historical
origins of the scarifical custom’s,the third part is the fieldwork of XinJiang
Heshuote Mongolian’s fire scarifical customs.the fourth parts is the cultrual
studies of XiinJiang Heshuote Mongolian’s scarifical customs.the fifth pars is the
conclusion of thesis,and the last part is the referenses of this thesis.
描述:
Mething of Dunlruang area of the tiMe, such as soaial life, final cial situation, legal
condition, geographical topography. Manners and custoMs and so on. And it provides us ;3n extreMely
valuable historical inforMation to know the legal systeM, social and econoMic life of Tang ;gong.
描述:
by human and god. What is
more important, Dayu spirit and culture due to him have a immeasurable effect on the
formation process of Chinese civilization, on the political awareness of feudal state, on the
lower-level life of the common people, and on the aesthetic culture of literature and art.