描述:
traditional
production lifestyle. However, along with the development of society and the harsh
natural environment, as well as the frangibility of nomadic economy. For traditional
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:
ral environments make the
cultural dissemination possible. In archeological materials we can see plenty of
Neolithic culture and Bronze culture,which may be nomads. Ywati, Wusun, Hun were
lived here.Befor Han Dynastie ,the area was regarded as wild and woolly place.the
Hun sprang up during Qin and Han Dynastie, Gansu Corridor became more and more
imporant in military and politics affairs. After the establish of Western Han
Dynasty ,the imperium rehabilitated for tens of years . Emperor han wudi change the
plant to the Hun. I
n
the second year of yuanshou of Emperor han
wudi(121BC),Huoqubing go on an expedition to Gansu Corridor,and wan,because the
Hunye king killed the Xiutu king . The Hunye king surrenderred and leaded his man
about 40000 .This is significant to the history of culture diaaemination. From then
on,Han culture hold the dominant position in the war.The pattern of dissemination
were war,politics and valueas.And the policy which Han made decision of the
dissemination and the speed. After long time Interaction,the two change the hisroy of
this area.Although some rejection and degradation happened,the new trail was
certainty.
Agricultural civilization took new tools to the area,and finally the Silk Road was
freely.It made a contribution to culture dissemination.However,the aggressive
e x p a n s i o n m a d e t h e immigrate and armies too huge,and led the crisis of
ecologyand resource. Qiang civilians uprising during the Eastern Han Dynastie made
the land desertificated.
The process was not at one stroke,but a long time. Rely on force was to set up a
unified ,multinational country.
描述:
large-scale farming tool that can
water
continuously from the ground-surface water in the rivers, lakes, or pools, and is mainly applied to lifting
water to the high ground or drain water in the low-lying farmland. Due to the reason that the traditional
描述:
ncentrated v}}ith 85% of the
total dry lands. and it is important for the national economy and the countr<0's strategic
agricultural growth. Northwest arid areas basically depend on natural precipitation. water
shortage has seriously affected the farmers practices. The decision of farmers to plant dry
land is a two-stage decision-making behavior: They first have to decide whether to plant
dry land, and then decide what kind of crops planted in the dry lands. It is essential to find
effective ways to raise the enthusiasm of farmers planting and reasonable arrangements for
dry land crop structure. However. ver}} few people study dry land farming practice from the
perspective of water shortages.